Add package compilation flags

src/bpmlib/compilation.go

@@ -11,6 +11,7 @@ import (
 	"os/exec"
 	"path"
 	"path/filepath"
+	"runtime"
 	"slices"
 	"strconv"
 	"strings"
@@ -23,7 +24,12 @@ import (
 var rootCompilationUID = "65534"
 var rootCompilationGID = "65534"
 
-func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, keepCompilationFiles, verbose bool) (outputBpmPackages map[string]string, err error) {
+func CompileSourcePackage(archiveFilename, outputDirectory string, flags map[string]string, compilationJobs int, skipChecks, keepCompilationFiles, verbose bool) (outputBpmPackages map[string]string, err error) {
+	// Set compilation jobs
+	if compilationJobs <= 0 || compilationJobs > runtime.NumCPU() {
+		compilationJobs = runtime.NumCPU()
+	}
+
 	// Initialize map
 	outputBpmPackages = make(map[string]string)
 
@@ -90,8 +96,8 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 		return nil, err
 	}
 
-	// Extract source.sh file
-	err = extractTarballFile(archiveFilename, "source.sh", tempDirectory, uid, gid)
+	// Extract recipe.sh file
+	err = extractTarballFile(archiveFilename, "recipe.sh", tempDirectory, uid, gid)
 	if err != nil {
 		return nil, err
 	}
@@ -139,12 +145,40 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 	env = append(env, "BPM_PKG_REVISION="+strconv.Itoa(bpmpkg.PkgInfo.Revision))
 	env = append(env, "BPM_PKG_URL="+bpmpkg.PkgInfo.Url)
 	env = append(env, "BPM_PKG_ARCH="+bpmpkg.PkgInfo.OutputArch)
+	env = append(env, "BPM_JOBS="+strconv.Itoa(compilationJobs))
+	for _, flag := range bpmpkg.PkgInfo.Flags {
+		if value, ok := flags[flag.Name]; ok {
+			env = append(env, "BPM_PKG_FLAG_"+strings.ToUpper(flag.Name)+"="+value)
+			fmt.Printf("Package flag: %s=%s\n", flag.Name, value)
+		} else {
+			env = append(env, "BPM_PKG_FLAG_"+strings.ToUpper(flag.Name)+"="+flag.DefaultValue)
+			fmt.Printf("Package flag: %s=%s\n", flag.Name, flag.DefaultValue)
+		}
+	}
 	env = append(env, CompilationBPMConfig.CompilationEnvironment...)
 
-	// Execute prepare and build functions in source.sh script
+	// Set common flags used for limiting job count
+	makeflags := ""
+	env = slices.DeleteFunc(env, func(s string) bool {
+		if strings.HasPrefix(s, "MAKEFLAGS=") {
+			makeflags = s + " "
+			return true
+		} else if strings.HasPrefix(s, "CMAKE_BUILD_PARALLEL_LEVEL=") {
+			return true
+		} else if strings.HasPrefix(s, "CARGO_BUILD_JOBS=") {
+			return true
+		}
+
+		return false
+	})
+	env = append(env, makeflags+"-j"+strconv.Itoa(compilationJobs))
+	env = append(env, "CMAKE_BUILD_PARALLEL_LEVEL="+strconv.Itoa(compilationJobs))
+	env = append(env, "CARGO_BUILD_JOBS="+strconv.Itoa(compilationJobs))
+
+	// Execute prepare and build functions in recipe.sh script
 	cmd := exec.Command("bash", "-c",
-		"set -a\n"+ // Source and export functions and variables in source.sh script
-			". \"${BPM_WORKDIR}\"/source.sh\n"+
+		"set -a\n"+ // Source and export functions and variables in recipe.sh script
+			". \"${BPM_WORKDIR}\"/recipe.sh\n"+
 			"set +a\n"+
 			"[[ $(type -t prepare) == \"function\" ]] && { echo \"Running prepare() function...\"; bash -e -c 'cd \"$BPM_WORKDIR\" && prepare' || exit 1; }\n"+ // Run prepare() function if it exists
 			"[[ $(type -t build) == \"function\" ]] && { echo \"Running build() function...\"; bash -e -c 'cd \"$BPM_SOURCE\" && build'  || exit 1; }\n"+ // Run build() function if it exists
@@ -162,11 +196,11 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 		return nil, err
 	}
 
-	// Execute check function in source.sh script if not skipping checks
+	// Execute check function in recipe.sh script if not skipping checks
 	if !skipChecks {
 		cmd = exec.Command("bash", "-c",
-			"set -a\n"+ // Source and export functions and variables in source.sh script
-				". \"${BPM_WORKDIR}\"/source.sh\n"+
+			"set -a\n"+ // Source and export functions and variables in recipe.sh script
+				". \"${BPM_WORKDIR}\"/recipe.sh\n"+
 				"set +a\n"+
 				"[[ $(type -t check) == \"function\" ]] && { echo \"Running check() function...\"; bash -e -c 'cd \"$BPM_SOURCE\" && check' || exit 1; }\n"+ // Run check() function if it exists
 				"exit 0")
@@ -213,10 +247,10 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 			packageFunctionName = "package_" + pkg.Name
 		}
 
-		// Execute package function in source.sh script and generate package file list
+		// Execute package function in recipe.sh script and generate package file list
 		cmd = exec.Command("bash", "-c",
-			"set -a\n"+ // Source and export functions and variables in source.sh script
-				". \"${BPM_WORKDIR}\"/source.sh\n"+
+			"set -a\n"+ // Source and export functions and variables in recipe.sh script
+				". \"${BPM_WORKDIR}\"/recipe.sh\n"+
 				"set +a\n"+
 				"echo \"Running "+packageFunctionName+"() function...\"\n"+
 				"( cd \"$BPM_SOURCE\" && fakeroot -s \"$BPM_WORKDIR\"/fakeroot_file bash -e -c '"+packageFunctionName+"' ) || exit 1\n") // Run package() function
@@ -304,7 +338,7 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 
 		// Generate package file list
 		fmt.Println("Generating package file list...")
-		cmd = exec.Command("bash", "-c", "fakeroot -i \"$BPM_WORKDIR\"/fakeroot_file find \"$BPM_OUTPUT\" -mindepth 1 -printf \"%P %#m %U %G %s\\n\" > \"$BPM_WORKDIR\"/pkg.files")
+		cmd = exec.Command("bash", "-c", "fakeroot -i \"$BPM_WORKDIR\"/fakeroot_file find \"$BPM_OUTPUT\" -mindepth 1 -printf \"%P %#m %U %G %s\\n\" > \"$BPM_WORKDIR\"/files.txt")
 		cmd.Dir = tempDirectory
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
@@ -320,7 +354,15 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 
 		// Create gzip-compressed archive for the package files
 		fmt.Println("Generating compressed file archive...")
-		cmd = exec.Command("bash", "-c", fmt.Sprintf("find %s -printf \"%%P\\n\" | fakeroot -i %s/fakeroot_file tar -czf files.tar.gz --no-recursion -C %s -T -", "output_"+pkg.Name, tempDirectory, "output_"+pkg.Name))
+		cmd = exec.Command("bash", "-c", fmt.Sprintf(`find %s -printf "%%P\n" | fakeroot -i %s/fakeroot_file tar czf files.tar.gz \
+			--sort=name \
+			--pax-option=exthdr.name=%%d/PaxHeaders/%%f,delete=atime,delete=ctime \
+			--mtime="UTC 1970-01-01" \
+			--numeric-owner \
+			--no-recursion \
+			-C %s \
+			-T -`,
+			"output_"+pkg.Name, tempDirectory, "output_"+pkg.Name))
 		cmd.Dir = tempDirectory
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
@@ -348,6 +390,31 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 		pkgInfo.SplitPackages = nil
 		pkgInfo.Downloads = nil
 
+		// Set built flag values and add their dependencies
+		for i, flag := range pkgInfo.Flags {
+			if value, ok := flags[flag.Name]; ok {
+				flag.BuiltValue = value
+			} else {
+				flag.BuiltValue = flag.DefaultValue
+			}
+
+			acceptedValueIndex := slices.IndexFunc(flag.AcceptedValues, func(acceptedValue PackageAcceptedValue) bool {
+				return acceptedValue.Value == flag.BuiltValue
+			})
+			if acceptedValueIndex < 0 {
+				return nil, fmt.Errorf("flag value not accepted: %s=%s", flag.Name, flag.BuiltValue)
+			}
+			acceptedValue := flag.AcceptedValues[acceptedValueIndex]
+
+			pkgInfo.Flags[i] = flag
+
+			pkgInfo.Depends = append(pkgInfo.Depends, acceptedValue.Depends...)
+			pkgInfo.RuntimeDepends = append(pkgInfo.RuntimeDepends, acceptedValue.RuntimeDepends...)
+			pkgInfo.OptionalDepends = append(pkgInfo.OptionalDepends, acceptedValue.OptionalDepends...)
+			pkgInfo.MakeDepends = append(pkgInfo.MakeDepends, acceptedValue.MakeDepends...)
+			pkgInfo.CheckDepends = append(pkgInfo.CheckDepends, acceptedValue.CheckDepends...)
+		}
+
 		// Marshal package info
 		pkgInfoBytes, err := yaml.Marshal(pkgInfo)
 		if err != nil {
@@ -355,26 +422,31 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 		}
 		pkgInfoBytes = append(pkgInfoBytes, '\n')
 
-		// Create pkg.info file
-		err = os.WriteFile(path.Join(tempDirectory, "pkg.info"), pkgInfoBytes, 0644)
+		// Create info.yml file
+		err = os.WriteFile(path.Join(tempDirectory, "info.yml"), pkgInfoBytes, 0644)
 		if err != nil {
 			return nil, err
 		}
 
-		// Change pkg.info file owner
-		err = os.Chown(path.Join(tempDirectory, "pkg.info"), uid, gid)
+		// Change info.yml file owner
+		err = os.Chown(path.Join(tempDirectory, "info.yml"), uid, gid)
 		if err != nil {
 			return nil, err
 		}
 
 		// Get files to include in BPM archive
 		bpmArchiveFiles := make([]string, 0)
-		bpmArchiveFiles = append(bpmArchiveFiles, "pkg.info", "pkg.files", "files.tar.gz") // Base files
+		bpmArchiveFiles = append(bpmArchiveFiles, "info.yml", "files.txt", "files.tar.gz") // Base files
 		bpmArchiveFiles = append(bpmArchiveFiles, packageScripts...)                       // Package scripts
 
 		// Create final BPM archive
 		fmt.Println("Generating final BPM archive...")
-		cmd = exec.Command("bash", "-c", "tar -cf final-archive.bpm --owner=0 --group=0 -C \"$BPM_WORKDIR\" "+strings.Join(bpmArchiveFiles, " "))
+		cmd = exec.Command("tar", "cf", "final-archive.bpm",
+			"--sort=name",
+			"--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime",
+			"--mtime=UTC 1970-01-01",
+			"--owner=0", "--group=0", "--numeric-owner")
+		cmd.Args = append(cmd.Args, bpmArchiveFiles...)
 		cmd.Dir = tempDirectory
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
@@ -392,8 +464,8 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 			return nil, fmt.Errorf("BPM archive could not be created: %s", err)
 		}
 
-		// Remove pkg.info file
-		err = os.Remove(path.Join(tempDirectory, "pkg.info"))
+		// Remove info.yml file
+		err = os.Remove(path.Join(tempDirectory, "info.yml"))
 		if err != nil {
 			return nil, err
 		}
@@ -431,6 +503,24 @@ func CompileSourcePackage(archiveFilename, outputDirectory string, skipChecks, k
 }
 
 func downloadPackageFiles(pkgInfo *PackageInfo, tempDirectory string, verbose bool) error {
+	// Get UID and GID to use for compilation
+	var uid, gid int
+	if os.Getuid() == 0 {
+		_uid, err := strconv.ParseInt(rootCompilationUID, 10, 32)
+		if err != nil {
+			return fmt.Errorf("could not convert UID '%s' to int", rootCompilationUID)
+		}
+		_gid, err := strconv.ParseInt(rootCompilationGID, 10, 32)
+		if err != nil {
+			return fmt.Errorf("could not convert GID '%s' to int", rootCompilationGID)
+		}
+		uid = int(_uid)
+		gid = int(_gid)
+	} else {
+		uid = os.Getuid()
+		gid = os.Getgid()
+	}
+
 	for _, download := range pkgInfo.Downloads {
 		// Replace variables
 		replaceVars := func(s string) string {
@@ -509,12 +599,22 @@ func downloadPackageFiles(pkgInfo *PackageInfo, tempDirectory string, verbose bo
 				fmt.Println("Skipping checksum checking...")
 			}
 
+			// Change downloaded file ownership
+			err = os.Chown(filepath, uid, gid)
+			if err != nil {
+				return err
+			}
+
 			if !download.NoExtract && (strings.Contains(filepath, ".tar") || strings.HasSuffix(filepath, ".tgz")) {
 				cmd := exec.Command("tar", "xf", filepath, "--strip-components="+strconv.Itoa(download.ExtractStripComponents))
 				if verbose {
 					cmd.Args[1] = "xvf"
 				}
 				cmd.Dir = tempDirectory
+				if os.Getuid() == 0 {
+					cmd.SysProcAttr = &syscall.SysProcAttr{}
+					cmd.SysProcAttr.Credential = &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)}
+				}
 				if extractTo != "" {
 					err := os.MkdirAll(extractTo, 0755)
 					if err != nil {
@@ -532,6 +632,11 @@ func downloadPackageFiles(pkgInfo *PackageInfo, tempDirectory string, verbose bo
 				}
 			} else if !download.NoExtract && strings.HasSuffix(filepath, ".zip") {
 				cmd := exec.Command("unzip", filepath)
+				cmd.Dir = tempDirectory
+				if os.Getuid() == 0 {
+					cmd.SysProcAttr = &syscall.SysProcAttr{}
+					cmd.SysProcAttr.Credential = &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)}
+				}
 				if extractTo != "" {
 					err := os.MkdirAll(extractTo, 0755)
 					if err != nil {
@@ -576,6 +681,10 @@ func downloadPackageFiles(pkgInfo *PackageInfo, tempDirectory string, verbose bo
 
 			cmd := exec.Command("git", "clone", "--depth=1", downloadUrl)
 			cmd.Dir = tempDirectory
+			if os.Getuid() == 0 {
+				cmd.SysProcAttr = &syscall.SysProcAttr{}
+				cmd.SysProcAttr.Credential = &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)}
+			}
 			if gitBranch != "" {
 				cmd.Args = slices.Insert(cmd.Args, len(cmd.Args)-1, "--branch="+gitBranch)
 			}
@@ -663,8 +772,8 @@ func showPackageFiles(archiveFilename string) error {
 		return nil
 	}
 
-	// Print pkg.info content
-	err = printTarballContent("pkg.info")
+	// Print info.yml content
+	err = printTarballContent("info.yml")
 	if err != nil {
 		return err
 	}
@@ -686,8 +795,8 @@ func showPackageFiles(archiveFilename string) error {
 		}
 	}
 
-	// Print source.sh content
-	err = printTarballContent("source.sh")
+	// Print recipe.sh content
+	err = printTarballContent("recipe.sh")
 	if err != nil {
 		return err
 	}

src/bpmlib/config.go

@@ -8,19 +8,22 @@ import (
 
 type MainBPMConfigStruct struct {
 	IgnorePackages            []string         `yaml:"ignore_packages"`
+	IgnorePaths               []string         `yaml:"ignore_paths"`
 	ShowSourcePackageContents string           `yaml:"show_source_package_contents"`
 	CleanupMakeDependencies   bool             `yaml:"cleanup_make_dependencies"`
 	Databases                 []configDatabase `yaml:"databases"`
 }
 
 type configDatabase struct {
-	Name     string `yaml:"name"`
-	Source   string `yaml:"source"`
-	Disabled *bool  `yaml:"disabled"`
+	Name              string `yaml:"name"`
+	Source            string `yaml:"source"`
+	VerificationLevel string `yaml:"verification_level"`
+	Disabled          *bool  `yaml:"disabled"`
 }
 
 type CompilationBPMConfigStruct struct {
 	PrivilegeEscalatorCmd  string   `yaml:"privilege_escalator_cmd"`
+	CompilationJobs        int      `yaml:"compilation_jobs"`
 	CompilationEnvironment []string `yaml:"compilation_env"`
 }
 

src/bpmlib/databases.go

@@ -17,12 +17,21 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+type VerificationLevel int
+
+const (
+	VerificationLevelNone VerificationLevel = iota
+	VerificationLevelAll
+	VerificationLevelTrusted
+)
+
 type BPMDatabase struct {
-	DatabaseVersion int                          `yaml:"database_version"`
-	Entries         map[string]*BPMDatabaseEntry `yaml:"entries"`
-	VirtualPackages map[string][]string
-	Name            string
-	Source          string
+	DatabaseVersion   int                          `yaml:"database_version"`
+	Entries           map[string]*BPMDatabaseEntry `yaml:"entries"`
+	VirtualPackages   map[string][]*BPMDatabaseEntry
+	Name              string
+	VerificationLevel VerificationLevel
+	Source            string
 }
 
 type BPMDatabaseEntry struct {
@@ -33,7 +42,7 @@ type BPMDatabaseEntry struct {
 	Database      *BPMDatabase
 }
 
-var BPMDatabases = make(map[string]*BPMDatabase)
+var BPMDatabases = make([]*BPMDatabase, 0)
 
 func (db *BPMDatabase) ContainsPackage(pkg string) bool {
 	_, ok := db.Entries[pkg]
@@ -59,8 +68,18 @@ func (db *configDatabase) ReadLocalDatabase() error {
 	}
 
 	// Initialize struct values
-	database.VirtualPackages = make(map[string][]string)
+	database.VirtualPackages = make(map[string][]*BPMDatabaseEntry)
 	database.Name = db.Name
+	switch db.VerificationLevel {
+	case "0", "none":
+		database.VerificationLevel = VerificationLevelNone
+	case "1", "all":
+		database.VerificationLevel = VerificationLevelAll
+	case "2", "trusted":
+		database.VerificationLevel = VerificationLevelTrusted
+	default:
+		database.VerificationLevel = VerificationLevelAll
+	}
 	database.Source = db.Source
 
 	for entryName, entry := range database.Entries {
@@ -105,18 +124,18 @@ func (db *configDatabase) ReadLocalDatabase() error {
 
 				// Add virtual packages to database
 				for _, p := range splitPkg.Provides {
-					database.VirtualPackages[p] = append(database.VirtualPackages[p], splitPkg.Name)
+					database.VirtualPackages[p] = append(database.VirtualPackages[p], database.Entries[splitPkg.Name])
 				}
 			}
 		} else {
 			// Add virtual packages to database
 			for _, p := range entry.Info.Provides {
-				database.VirtualPackages[p] = append(database.VirtualPackages[p], entry.Info.Name)
+				database.VirtualPackages[p] = append(database.VirtualPackages[p], entry)
 			}
 		}
 	}
 
-	BPMDatabases[db.Name] = database
+	BPMDatabases = append(BPMDatabases, database)
 
 	return nil
 }
@@ -188,33 +207,85 @@ func ReadLocalDatabaseFiles() (err error) {
 	return nil
 }
 
-func GetDatabaseEntry(str string) (*BPMDatabaseEntry, *BPMDatabase, error) {
-	split := strings.Split(str, "/")
+func ResolveDatabaseEntry(d DeconstructedPackageString, rootDir string) *BPMDatabaseEntry {
+	results := SearchDatabaseEntries(d.PkgName)
+	for _, result := range results {
+
+		if EvaluatePackageString(result.Info, d) {
+			return result
+		}
+	}
+
+	installedProviders := GetVirtualPackageInfo(d.PkgName, rootDir)
+	for _, provider := range installedProviders {
+		results := SearchDatabaseEntries(provider.Name)
+		for _, result := range results {
+			if EvaluatePackageString(result.Info, d) {
+				return result
+			}
+		}
+	}
+
+	databaseProviders := SearchDatabaseVirtualPackageProviders(d.PkgName)
+	for _, provider := range databaseProviders {
+		results := SearchDatabaseEntries(provider.Info.Name)
+		for _, result := range results {
+			if EvaluatePackageString(result.Info, d) {
+				return result
+			}
+		}
+	}
+
+	return nil
+}
+
+func SearchDatabaseEntries(pkg string) (results []*BPMDatabaseEntry) {
+	split := strings.Split(pkg, "/")
 	if len(split) == 1 {
 		pkgName := strings.TrimSpace(split[0])
 		if pkgName == "" {
-			return nil, nil, errors.New("could not find database entry for this package")
+			return results
 		}
 		for _, db := range BPMDatabases {
 			if db.ContainsPackage(pkgName) {
-				return db.Entries[pkgName], db, nil
+				results = append(results, db.Entries[pkgName])
 			}
 		}
-		return nil, nil, errors.New("could not find database entry for this package")
+		return results
 	} else if len(split) == 2 {
 		dbName := strings.TrimSpace(split[0])
 		pkgName := strings.TrimSpace(split[1])
 		if dbName == "" || pkgName == "" {
-			return nil, nil, errors.New("could not find database entry for this package")
+			return results
 		}
-		db := BPMDatabases[dbName]
-		if db == nil || !db.ContainsPackage(pkgName) {
-			return nil, nil, errors.New("could not find database entry for this package")
+		dbIndex := slices.IndexFunc(BPMDatabases, func(db *BPMDatabase) bool {
+			return db.Name == dbName
+		})
+		if dbIndex < 0 {
+			return results
 		}
-		return db.Entries[pkgName], db, nil
-	} else {
-		return nil, nil, errors.New("could not find database entry for this package")
+
+		db := BPMDatabases[dbIndex]
+		if !db.ContainsPackage(pkgName) {
+			return results
+		}
+
+		results = append(results, db.Entries[pkgName])
 	}
+
+	return results
+}
+
+func SearchDatabaseVirtualPackageProviders(vpkg string) (providers []*BPMDatabaseEntry) {
+	for _, db := range BPMDatabases {
+		providers = append(providers, db.VirtualPackages[vpkg]...)
+	}
+
+	slices.SortFunc(providers, func(a, b *BPMDatabaseEntry) int {
+		return strings.Compare(a.Info.Name, b.Info.Name)
+	})
+
+	return providers
 }
 
 func FindReplacement(pkg string) *BPMDatabaseEntry {
@@ -231,17 +302,6 @@ func FindReplacement(pkg string) *BPMDatabaseEntry {
 	return nil
 }
 
-func ResolveVirtualPackage(vpkg string) *BPMDatabaseEntry {
-	for _, db := range BPMDatabases {
-		if v, ok := db.VirtualPackages[vpkg]; ok {
-			slices.Sort(v)
-			return db.Entries[v[0]]
-		}
-	}
-
-	return nil
-}
-
 func (db *BPMDatabase) FetchPackage(pkg string) (string, error) {
 	// Check if package exists in database
 	if !db.ContainsPackage(pkg) {
@@ -256,20 +316,92 @@ func (db *BPMDatabase) FetchPackage(pkg string) (string, error) {
 	}
 
 	// Download package from url
-	err = downloadFile("Downloading "+entry.Info.Name, u, path.Join("/var/cache/bpm/fetched/", path.Base(entry.Filepath)), 0644)
+	filepath := path.Join("/var/cache/bpm/fetched/", path.Base(entry.Filepath))
+	err = downloadFile("Downloading "+entry.Info.Name, u, filepath, 0644)
 	if err != nil {
 		return "", err
 	}
 
-	return path.Join("/var/cache/bpm/fetched/", path.Base(entry.Filepath)), nil
+	// Download and verify signature if required
+	if db.VerificationLevel != VerificationLevelNone {
+		err = downloadFile("", u+".sig", filepath+".sig", 0644)
+		if err != nil {
+			return "", err
+		}
+
+		err := VerifySignature(filepath, filepath+".sig", db.VerificationLevel == VerificationLevelTrusted, "/")
+		if err != nil {
+			return "", fmt.Errorf("Could not verify signature for %s: %s", filepath, err)
+		}
+	}
+
+	return filepath, nil
 }
 
 func (entry *BPMDatabaseEntry) GetEntryDependants() (dependants []string) {
 	dependantsMap := make(map[string][]string)
+
+	// Loop through all entries
 	for _, db := range BPMDatabases {
 		for _, e := range db.Entries {
-			if slices.Contains(e.Info.Depends, entry.Info.Name) {
-				dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], e.Database.Name)
+			// Skip iteration if comparing the same packages
+			if e.Info.Name == entry.Info.Name {
+				continue
+			}
+
+			// Add installed package to list if its dependencies include pkgName
+			if slices.ContainsFunc(e.Info.Depends, func(n string) bool {
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == entry.Info.Name
+			}) {
+				dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], db.Name)
+				continue
+			}
+
+			// Add installed package to list if its runtime dependencies include pkgName
+			if slices.ContainsFunc(e.Info.RuntimeDepends, func(n string) bool {
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == entry.Info.Name
+			}) {
+				dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], db.Name)
+				continue
+			}
+
+			// Loop through each virtual package
+			for _, vpkg := range entry.Info.Provides {
+				// Add installed package to list if its dependencies contain a provided virtual package
+				if slices.ContainsFunc(e.Info.Depends, func(n string) bool {
+					d, err := DeconstructPackageString(n)
+					if err != nil {
+						return false
+					}
+
+					return d.PkgName == vpkg
+				}) {
+					dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], db.Name)
+					break
+				}
+
+				// Add installed package to list if its runtime dependencies contain a provided virtual package
+				if slices.ContainsFunc(e.Info.RuntimeDepends, func(n string) bool {
+					d, err := DeconstructPackageString(n)
+					if err != nil {
+						return false
+					}
+
+					return d.PkgName == vpkg
+				}) {
+					dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], db.Name)
+					break
+				}
 			}
 		}
 	}
@@ -297,7 +429,15 @@ func (entry *BPMDatabaseEntry) GetEntryOptionalDependants() (dependants []string
 	dependantsMap := make(map[string][]string)
 	for _, db := range BPMDatabases {
 		for _, e := range db.Entries {
-			if slices.Contains(e.Info.OptionalDepends, entry.Info.Name) {
+			if slices.ContainsFunc(e.Info.OptionalDepends, func(n string) bool {
+				// Deconstruct package string
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == entry.Info.Name
+			}) {
 				dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], e.Database.Name)
 			}
 		}
@@ -322,63 +462,220 @@ func (entry *BPMDatabaseEntry) GetEntryOptionalDependants() (dependants []string
 	return dependants
 }
 
-func (entry *BPMDatabaseEntry) CreateReadableInfo(rootDir string, humanReadableSize bool) string {
-	ret := make([]string, 0)
-	appendArray := func(label string, array []string, sort bool) {
+func (entry *BPMDatabaseEntry) GetEntryMakeDependants() (dependants []string) {
+	dependantsMap := make(map[string][]string)
+	for _, db := range BPMDatabases {
+		for _, e := range db.Entries {
+			if slices.ContainsFunc(e.Info.MakeDepends, func(n string) bool {
+				// Deconstruct package string
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == entry.Info.Name
+			}) {
+				dependantsMap[e.Info.Name] = append(dependantsMap[e.Info.Name], e.Database.Name)
+			}
+		}
+	}
+
+	// Get keys
+	keySlice := slices.Collect(maps.Keys(dependantsMap))
+	slices.Sort(keySlice)
+
+	// Add all dependant entries to slice in alphabetical order
+	for _, entryName := range keySlice {
+		dbs := dependantsMap[entryName]
+		if len(dbs) > 1 {
+			for _, db := range dbs {
+				dependants = append(dependants, db+"/"+entryName)
+			}
+		} else {
+			dependants = append(dependants, entryName)
+		}
+	}
+
+	return dependants
+}
+
+func (entry *BPMDatabaseEntry) CreateReadableInfo(rootDir string, showBytes bool) string {
+	builder := strings.Builder{}
+	builderWriteStringNotEmpty := func(label string, value string) {
+		if value != "" {
+			builder.WriteString(label + ": " + value + "\n")
+		}
+	}
+	builderWriteArray := func(label string, array []string, sort bool) {
 		if len(array) == 0 {
 			return
 		}
 
+		// Sort array
 		if sort {
-			// Sort array
 			slices.Sort(array)
 		}
 
-		ret = append(ret, fmt.Sprintf("%s: %s", label, strings.Join(array, ", ")))
+		builder.WriteString(label + " (" + strconv.Itoa(len(array)) + "):\n")
+		for _, val := range array {
+			builder.WriteString("  - " + val + "\n")
+		}
+	}
+	builderWriteDependencyArray := func(label string, depends []string) {
+		if len(depends) == 0 {
+			return
+		}
+
+		// Sort array
+		slices.Sort(depends)
+
+		builder.WriteString(label + " (" + strconv.Itoa(len(depends)) + "):\n")
+		for _, val := range depends {
+			builder.WriteString("  - " + val)
+
+			// Show virtual package providers
+			if providers := SearchDatabaseVirtualPackageProviders(val); len(providers) > 0 {
+				builder.WriteString(" (")
+				for i, vpkg := range providers {
+					if i == len(providers)-1 {
+						builder.WriteString(vpkg.Info.Name)
+					} else {
+						builder.WriteString(vpkg.Info.Name + ", ")
+					}
+				}
+				builder.WriteString(")")
+			}
+
+			builder.WriteString("\n")
+		}
 	}
 
-	ret = append(ret, "Name: "+entry.Info.Name)
-	ret = append(ret, "Database: "+entry.Database.Name)
-	ret = append(ret, "Description: "+entry.Info.Description)
-	ret = append(ret, "Version: "+entry.Info.GetFullVersion())
-	if entry.Info.Url != "" {
-		ret = append(ret, "URL: "+entry.Info.Url)
-	}
-	if entry.Info.License != "" {
-		ret = append(ret, "License: "+entry.Info.License)
-	}
-	ret = append(ret, "Architecture: "+entry.Info.Arch)
+	// Main information
+	builder.WriteString("Name: " + entry.Info.Name + "\n")
+	builder.WriteString("Database: " + entry.Database.Name + "\n")
+	builder.WriteString("Description: " + entry.Info.Description + "\n")
+	builder.WriteString("Version: " + entry.Info.GetFullVersion() + "\n")
+	builderWriteStringNotEmpty("URL", entry.Info.Url)
+	builderWriteStringNotEmpty("License", entry.Info.License)
+	builderWriteArray("Maintainers", entry.Info.Maintainers, false)
+	builder.WriteString("Architecture: " + entry.Info.Arch + "\n")
 	if entry.Info.Type == "source" && entry.Info.OutputArch != "" && entry.Info.OutputArch != GetArch() {
-		ret = append(ret, "Output architecture: "+entry.Info.OutputArch)
+		builder.WriteString("Output architecture: " + entry.Info.OutputArch + "\n")
 	}
-	ret = append(ret, "Type: "+entry.Info.Type)
-	appendArray("Dependencies", entry.Info.Depends, true)
-	if entry.Info.Type == "source" {
-		appendArray("Make Dependencies", entry.Info.MakeDepends, true)
-	}
-	appendArray("Optional dependencies", entry.Info.OptionalDepends, true)
-	dependants := entry.GetEntryDependants()
-	if len(dependants) > 0 {
-		appendArray("Dependant packages", dependants, false)
-	}
-	optionalDependants := entry.GetEntryOptionalDependants()
-	if len(optionalDependants) > 0 {
-		appendArray("Optionally dependant packages", optionalDependants, false)
-	}
-	appendArray("Conflicting packages", entry.Info.Conflicts, true)
-	appendArray("Provided packages", entry.Info.Provides, true)
-	appendArray("Replaces packages", entry.Info.Replaces, true)
+	builder.WriteString("Type: " + entry.Info.Type + "\n")
 
+	// Flags
+	if entry.Info.Type == "binary" {
+		var flags []string
+		for _, flag := range entry.Info.Flags {
+			flags = append(flags, fmt.Sprintf("%s=%s", flag.Name, flag.BuiltValue))
+		}
+		builderWriteArray("Built with flags:", flags, false)
+	} else {
+		if len(entry.Info.Flags) > 0 {
+			builder.WriteString("Available flags (")
+			builder.WriteString(strconv.Itoa(len(entry.Info.Flags)))
+			builder.WriteString("):\n")
+			for _, flag := range entry.Info.Flags {
+				builder.WriteString("  - Flag: ")
+				builder.WriteString(flag.Name)
+				builder.WriteRune('\n')
+				if flag.DefaultValue != "" {
+					builder.WriteString("    Default value: ")
+					builder.WriteString(flag.DefaultValue)
+					builder.WriteRune('\n')
+				}
+				if len(flag.AcceptedValues) > 0 {
+					builder.WriteString("    Accepted values (")
+					builder.WriteString(strconv.Itoa(len(flag.AcceptedValues)))
+					builder.WriteString("):\n")
+
+					for i, acceptedValue := range flag.AcceptedValues {
+						writeValueDepends := func(text string, depends []string) {
+							if len(depends) > 0 {
+								builder.WriteString("        ")
+								builder.WriteString(text)
+								builder.WriteString(" (")
+								builder.WriteString(strconv.Itoa(len(depends)))
+								builder.WriteString("): ")
+								for _, depend := range depends {
+									if i != 0 {
+										builder.WriteString(", ")
+									}
+									builder.WriteString(depend)
+								}
+								builder.WriteRune('\n')
+							}
+						}
+
+						builder.WriteString("      - Value: ")
+						builder.WriteString(acceptedValue.Value)
+						builder.WriteRune('\n')
+						writeValueDepends("Dependencies", acceptedValue.Depends)
+						writeValueDepends("Make Dependencies", acceptedValue.MakeDepends)
+						writeValueDepends("Check Dependencies", acceptedValue.CheckDepends)
+						writeValueDepends("Runtime Dependencies", acceptedValue.RuntimeDepends)
+						writeValueDepends("Optional Dependencies", acceptedValue.OptionalDepends)
+					}
+				}
+			}
+		}
+	}
+
+	// Dependencies
+	builderWriteDependencyArray("Dependencies", entry.Info.Depends)
+	if entry.Info.Type == "source" {
+		builderWriteDependencyArray("Make dependencies", entry.Info.MakeDepends)
+		builderWriteDependencyArray("Check dependencies", entry.Info.CheckDepends)
+	}
+	builderWriteDependencyArray("Runtime dependencies", entry.Info.RuntimeDepends)
+	if len(entry.Info.OptionalDepends) > 0 {
+		builder.WriteString("Optional dependencies: (" + strconv.Itoa(len(entry.Info.OptionalDepends)) + ")\n")
+		for _, depend := range entry.Info.OptionalDepends {
+			dependSplit := strings.SplitN(depend, ":", 2)
+			if len(dependSplit) == 2 {
+				builder.WriteString(fmt.Sprintf("  - %s (%s)", dependSplit[0], dependSplit[1]))
+			} else {
+				builder.WriteString("  - " + dependSplit[0])
+			}
+
+			// Show virtual package providers
+			if providers := SearchDatabaseVirtualPackageProviders(dependSplit[0]); len(providers) > 0 {
+				builder.WriteString(" (")
+				for i, vpkg := range providers {
+					if i == len(providers)-1 {
+						builder.WriteString(vpkg.Info.Name)
+					} else {
+						builder.WriteString(vpkg.Info.Name + ", ")
+					}
+				}
+				builder.WriteString(")")
+			}
+
+			builder.WriteString("\n")
+		}
+	}
+	builderWriteArray("Dependant packages", entry.GetEntryDependants(), true)
+	builderWriteArray("Optionally dependant packages", entry.GetEntryOptionalDependants(), true)
+	builderWriteArray("Make dependant packages", entry.GetEntryMakeDependants(), true)
+
+	// Other package relations
+	builderWriteArray("Conflicting packages", entry.Info.Conflicts, true)
+	builderWriteArray("Provided packages", entry.Info.Provides, true)
+	builderWriteArray("Replaces packages", entry.Info.Replaces, true)
+
+	// Split packages
 	if entry.Info.Type == "source" && len(entry.Info.SplitPackages) != 0 {
 		splitPkgs := make([]string, len(entry.Info.SplitPackages))
 		for i, splitPkgInfo := range entry.Info.SplitPackages {
 			splitPkgs[i] = splitPkgInfo.Name
 		}
-		appendArray("Split Packages", splitPkgs, true)
+		builderWriteArray("Split packages", splitPkgs, true)
 	}
 
+	// Installation reason
 	if rootDir != "" && IsPackageInstalled(entry.Info.Name, rootDir) {
-		installationReason := GetInstallationReason(entry.Info.Name, rootDir)
+		installationReason := GetPackage(entry.Info.Name, rootDir).LocalInfo.GetInstallationReason()
 		var installationReasonString string
 		switch installationReason {
 		case InstallationReasonManual:
@@ -390,17 +687,30 @@ func (entry *BPMDatabaseEntry) CreateReadableInfo(rootDir string, humanReadableS
 		default:
 			installationReasonString = "Unknown"
 		}
-		ret = append(ret, "Installation Reason: "+installationReasonString)
+		builder.WriteString("Installation reason: " + installationReasonString + "\n")
 	}
+
+	// Download size
+	downloadSize := entry.DownloadSize
+	var downloadSizeStr string
+	if showBytes {
+		downloadSizeStr = strconv.FormatInt(downloadSize, 10)
+	} else {
+		downloadSizeStr = BytesToHumanReadable(downloadSize)
+	}
+	builder.WriteString("Download size: " + downloadSizeStr + "\n")
+
+	// Installed size
 	if entry.Info.Type == "binary" {
 		installedSize := entry.InstalledSize
 		var installedSizeStr string
-		if humanReadableSize {
-			installedSizeStr = BytesToHumanReadable(installedSize)
-		} else {
+		if showBytes {
 			installedSizeStr = strconv.FormatInt(installedSize, 10)
+		} else {
+			installedSizeStr = BytesToHumanReadable(installedSize)
 		}
-		ret = append(ret, "Installed size: "+installedSizeStr)
+		builder.WriteString("Installed size: " + installedSizeStr + "\n")
 	}
-	return strings.Join(ret, "\n")
+
+	return strings.TrimSpace(builder.String())
 }

src/bpmlib/dependencies.go

@@ -2,180 +2,12 @@ package bpmlib
 
 import (
 	"fmt"
+	"maps"
 	"slices"
+	"strings"
 )
 
-type pkgInstallationReason struct {
-	PkgName            string
-	InstallationReason InstallationReason
-}
-
-func (pkgInfo *PackageInfo) GetDependencies(includeMakeDepends, includeOptionalDepends bool) []pkgInstallationReason {
-	allDepends := make([]pkgInstallationReason, 0)
-
-	for _, depend := range pkgInfo.Depends {
-		if !slices.ContainsFunc(allDepends, func(p pkgInstallationReason) bool {
-			return p.PkgName == depend
-		}) {
-			allDepends = append(allDepends, pkgInstallationReason{
-				PkgName:            depend,
-				InstallationReason: InstallationReasonDependency,
-			})
-		}
-	}
-	if includeOptionalDepends {
-		for _, depend := range pkgInfo.OptionalDepends {
-			if !slices.ContainsFunc(allDepends, func(p pkgInstallationReason) bool {
-				return p.PkgName == depend
-			}) {
-				allDepends = append(allDepends, pkgInstallationReason{
-					PkgName:            depend,
-					InstallationReason: InstallationReasonManual,
-				})
-			}
-		}
-	}
-	if includeMakeDepends {
-		for _, depend := range pkgInfo.MakeDepends {
-			if !slices.ContainsFunc(allDepends, func(p pkgInstallationReason) bool {
-				return p.PkgName == depend
-			}) {
-				allDepends = append(allDepends, pkgInstallationReason{
-					PkgName:            depend,
-					InstallationReason: InstallationReasonMakeDependency,
-				})
-			}
-		}
-	}
-
-	// Skip ignored packages
-	allDepends = slices.DeleteFunc(allDepends, func(depend pkgInstallationReason) bool {
-		return slices.Contains(MainBPMConfig.IgnorePackages, depend.PkgName)
-	})
-
-	return allDepends
-}
-
-func (pkgInfo *PackageInfo) GetDependenciesRecursive(includeMakeDepends bool, rootDir string) (resolved []string) {
-	// Initialize slices
-	resolved = make([]string, 0)
-	unresolved := make([]string, 0)
-
-	// Call unexported function
-	pkgInfo.getDependenciesRecursive(&resolved, &unresolved, includeMakeDepends, rootDir)
-
-	return resolved
-}
-
-func (pkgInfo *PackageInfo) getDependenciesRecursive(resolved *[]string, unresolved *[]string, includeMakeDepends bool, rootDir string) {
-	// Add current package name to unresolved slice
-	*unresolved = append(*unresolved, pkgInfo.Name)
-
-	// Loop through all dependencies
-	for _, pkgIR := range pkgInfo.GetDependencies(includeMakeDepends, false) {
-		depend := pkgIR.PkgName
-
-		if isVirtual, p := IsVirtualPackage(depend, rootDir); isVirtual {
-			depend = p
-		}
-
-		if !slices.Contains(*resolved, depend) {
-			// Add current dependency to resolved slice when circular dependency is detected
-			if slices.Contains(*unresolved, depend) {
-				if !slices.Contains(*resolved, depend) {
-					*resolved = append(*resolved, depend)
-				}
-				continue
-			}
-
-			dependInfo := GetPackageInfo(depend, rootDir)
-
-			if dependInfo != nil {
-				dependInfo.getDependenciesRecursive(resolved, unresolved, includeMakeDepends, rootDir)
-			}
-		}
-	}
-	if !slices.Contains(*resolved, pkgInfo.Name) {
-		*resolved = append(*resolved, pkgInfo.Name)
-	}
-	*unresolved = stringSliceRemove(*unresolved, pkgInfo.Name)
-}
-
-func ResolveAllPackageDependenciesFromDatabases(pkgInfo *PackageInfo, checkMake, checkOptional, ignoreInstalled, verbose bool, rootDir string) (resolved []pkgInstallationReason, unresolved []string) {
-	// Initialize slices
-	resolved = make([]pkgInstallationReason, 0)
-	unresolved = make([]string, 0)
-
-	// Call unexported function
-	resolvePackageDependenciesFromDatabase(&resolved, &unresolved, pkgInfo, checkMake, checkOptional, ignoreInstalled, verbose, rootDir)
-
-	// Remove main package from unresolved slice
-	unresolved = stringSliceRemove(unresolved, pkgInfo.Name)
-
-	return resolved, unresolved
-}
-
-func resolvePackageDependenciesFromDatabase(resolved *[]pkgInstallationReason, unresolved *[]string, pkgInfo *PackageInfo, checkMake, checkOptional, ignoreInstalled, verbose bool, rootDir string) {
-	// Add current package name to unresolved slice
-	*unresolved = append(*unresolved, pkgInfo.Name)
-
-	// Loop through all dependencies
-	for _, pkgIR := range pkgInfo.GetDependencies(pkgInfo.Type == "source", checkOptional) {
-		// Skip dependency if it has already been resolved
-		if slices.ContainsFunc(*resolved, func(p pkgInstallationReason) bool {
-			return p.PkgName == pkgIR.PkgName
-		}) {
-			continue
-		}
-
-		// Add current dependency to resolved slice when circular dependency is detected
-		if slices.Contains(*unresolved, pkgIR.PkgName) {
-			if verbose {
-				fmt.Printf("Circular dependency was detected (%s -> %s). Installing %s first\n", pkgInfo.Name, pkgIR.PkgName, pkgIR.PkgName)
-			}
-
-			*resolved = append(*resolved, pkgInstallationReason{
-				PkgName:            pkgIR.PkgName,
-				InstallationReason: pkgIR.InstallationReason,
-			})
-			continue
-		}
-
-		// Skip dependency if it is already installed or provided
-		if ignoreInstalled && IsPackageProvided(pkgIR.PkgName, rootDir) {
-			continue
-		}
-
-		// Get database entry for dependency
-		var err error
-		var entry *BPMDatabaseEntry
-		entry, _, err = GetDatabaseEntry(pkgIR.PkgName)
-		if err != nil {
-			if entry = ResolveVirtualPackage(pkgIR.PkgName); entry == nil {
-				if !slices.Contains(*unresolved, pkgIR.PkgName) {
-					*unresolved = append(*unresolved, pkgIR.PkgName)
-				}
-				continue
-			}
-		}
-
-		// Resolve the dependencies of this dependency
-		resolvePackageDependenciesFromDatabase(resolved, unresolved, entry.Info, checkMake, false, ignoreInstalled, verbose, rootDir)
-
-		// Move dependency from the unresolved slice to the resolved slice
-		if !slices.ContainsFunc(*resolved, func(p pkgInstallationReason) bool {
-			return p.PkgName == entry.Info.Name
-		}) {
-			*resolved = append(*resolved, pkgInstallationReason{
-				PkgName:            entry.Info.Name,
-				InstallationReason: pkgIR.InstallationReason,
-			})
-		}
-		*unresolved = stringSliceRemove(*unresolved, entry.Info.Name)
-	}
-}
-
-func (pkgInfo *PackageInfo) GetPackageDependants(rootDir string) (dependants []string) {
+func (pkgInfo *PackageInfo) GetPackageDependants(rootDir string, skipMultipleProviders bool) (dependants []string) {
 	// Get installed package names
 	pkgs, ok := localPackageInformation[rootDir]
 	if !ok {
@@ -191,7 +23,27 @@ func (pkgInfo *PackageInfo) GetPackageDependants(rootDir string) (dependants []s
 
 		// Add installed package to list if its dependencies include pkgName
 		if slices.ContainsFunc(installedPkg.Depends, func(n string) bool {
-			return n == pkgInfo.Name
+			// Deconstruct package string
+			d, err := DeconstructPackageString(n)
+			if err != nil {
+				return false
+			}
+
+			return d.PkgName == pkgInfo.Name
+		}) {
+			dependants = append(dependants, installedPkg.Name)
+			continue
+		}
+
+		// Add installed package to list if its runtime dependencies include pkgName
+		if slices.ContainsFunc(installedPkg.RuntimeDepends, func(n string) bool {
+			// Deconstruct package string
+			d, err := DeconstructPackageString(n)
+			if err != nil {
+				return false
+			}
+
+			return d.PkgName == pkgInfo.Name
 		}) {
 			dependants = append(dependants, installedPkg.Name)
 			continue
@@ -199,9 +51,33 @@ func (pkgInfo *PackageInfo) GetPackageDependants(rootDir string) (dependants []s
 
 		// Loop through each virtual package
 		for _, vpkg := range pkgInfo.Provides {
+			if skipMultipleProviders && len(GetVirtualPackageInfo(vpkg, rootDir)) > 1 {
+				continue
+			}
+
 			// Add installed package to list if its dependencies contain a provided virtual package
 			if slices.ContainsFunc(installedPkg.Depends, func(n string) bool {
-				return n == vpkg
+				// Deconstruct package string
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == vpkg
+			}) {
+				dependants = append(dependants, installedPkg.Name)
+				break
+			}
+
+			// Add installed package to list if its runtime dependencies contain a provided virtual package
+			if slices.ContainsFunc(installedPkg.RuntimeDepends, func(n string) bool {
+				// Deconstruct package string
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == vpkg
 			}) {
 				dependants = append(dependants, installedPkg.Name)
 				break
@@ -228,7 +104,13 @@ func (pkgInfo *PackageInfo) GetPackageOptionalDependants(rootDir string) (depend
 
 		// Add installed package to list if its optional dependencies include pkgName
 		if slices.ContainsFunc(installedPkg.OptionalDepends, func(n string) bool {
-			return n == pkgInfo.Name
+			// Deconstruct package string
+			d, err := DeconstructPackageString(n)
+			if err != nil {
+				return false
+			}
+
+			return d.PkgName == pkgInfo.Name
 		}) {
 			dependants = append(dependants, installedPkg.Name)
 			continue
@@ -238,7 +120,13 @@ func (pkgInfo *PackageInfo) GetPackageOptionalDependants(rootDir string) (depend
 		for _, vpkg := range pkgInfo.Provides {
 			// Add installed package to list if its optional dependencies contain a provided virtual package
 			if slices.ContainsFunc(installedPkg.OptionalDepends, func(n string) bool {
-				return n == vpkg
+				// Deconstruct package string
+				d, err := DeconstructPackageString(n)
+				if err != nil {
+					return false
+				}
+
+				return d.PkgName == vpkg
 			}) {
 				dependants = append(dependants, installedPkg.Name)
 				break
@@ -248,3 +136,291 @@ func (pkgInfo *PackageInfo) GetPackageOptionalDependants(rootDir string) (depend
 
 	return dependants
 }
+
+type ResolvedPackage struct {
+	DatabaseEntry      *BPMDatabaseEntry
+	Flags              map[string]string
+	InstallationReason InstallationReason
+}
+
+func ResolveDependencies(pkgInfo *PackageInfo, flags, resolvedVirtualPackages map[string]string, includeRuntimeDepends bool, rootDir string) (resolved []ResolvedPackage, unresolved map[string]string) {
+	unresolved = make(map[string]string)
+	visited := make([]string, 0)
+
+	var dfs func(resolvedPkg *PackageInfo, flags map[string]string)
+	dfs = func(pkgInfo *PackageInfo, flags map[string]string) {
+		checkDependencies := func(dependencies []string, installationReason InstallationReason) {
+			for _, depend := range dependencies {
+				// Deconstruct package string
+				d, err := DeconstructPackageString(depend)
+				if err != nil {
+					unresolved[depend] = "could not deconstruct package string: " + err.Error()
+					continue
+				}
+
+				// Check resolved virtual packages
+				if resolvedPkg, ok := resolvedVirtualPackages[d.PkgName]; ok {
+					d.PkgName = resolvedPkg
+				}
+
+				// Find database entry for dependency
+				dependEntry := ResolveDatabaseEntry(d, rootDir)
+				if dependEntry == nil {
+					unresolved[depend] = "could not find in any database"
+					continue
+				}
+				d.PkgName = dependEntry.Info.Name
+
+				// Skip ignored packages in config
+				if rootDir == "/" && slices.Contains(MainBPMConfig.IgnorePackages, dependEntry.Info.Name) {
+					continue
+				}
+
+				// Add user defined package flags and resolve entry again if package is already installed
+				if installedInfo := GetPackageInfo(dependEntry.Info.Name, rootDir); installedInfo != nil {
+					d.Flags, err = CombineFlags(getPackageLocalInfo(dependEntry.Info.Name, rootDir).Flags, d.Flags)
+					if err != nil {
+						unresolved[depend] = "could not combine flags: " + err.Error()
+						continue
+					}
+
+					dependEntry = ResolveDatabaseEntry(d, rootDir)
+					if dependEntry == nil {
+						unresolved[depend] = "could not find in any database"
+						continue
+					}
+
+					shouldIgnore := true
+
+					// Skip if no update/downgrade is available
+					if installedInfo.GetFullVersion() != dependEntry.Info.GetFullVersion() {
+						shouldIgnore = false
+					}
+
+					// Skip if no new package flags
+					if !maps.Equal(getPackageLocalInfo(dependEntry.Info.Name, rootDir).Flags, d.Flags) {
+						shouldIgnore = false
+					}
+
+					if shouldIgnore {
+						continue
+					}
+				}
+
+				// Resolve virtual packages
+				for _, vpkg := range dependEntry.Info.Provides {
+					if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+						resolvedVirtualPackages[vpkg] = dependEntry.Info.Name
+					}
+				}
+
+				// Resolve entry dependencies
+				if !slices.Contains(visited, dependEntry.Info.Name) {
+					dfs(dependEntry.Info, d.Flags)
+					resolved = append(resolved, ResolvedPackage{DatabaseEntry: dependEntry, Flags: d.Flags, InstallationReason: installationReason})
+				}
+			}
+		}
+
+		visited = append(visited, pkgInfo.Name)
+
+		checkDependencies(pkgInfo.Depends, InstallationReasonDependency)
+		if includeRuntimeDepends {
+			checkDependencies(pkgInfo.RuntimeDepends, InstallationReasonDependency)
+		}
+		if pkgInfo.Type == "source" {
+			checkDependencies(pkgInfo.MakeDepends, InstallationReasonMakeDependency)
+			checkDependencies(pkgInfo.CheckDepends, InstallationReasonMakeDependency)
+
+			// Resolve flag-specific dependencies
+			for _, flag := range pkgInfo.Flags {
+				acceptedValueIndex := slices.IndexFunc(flag.AcceptedValues, func(acceptedValue PackageAcceptedValue) bool {
+					if value, ok := flags[flag.Name]; ok {
+						return acceptedValue.Value == value
+					} else {
+						return acceptedValue.Value == flag.DefaultValue
+					}
+				})
+				if acceptedValueIndex < 0 {
+					continue
+				}
+				acceptedValue := flag.AcceptedValues[acceptedValueIndex]
+
+				checkDependencies(acceptedValue.Depends, InstallationReasonDependency)
+				checkDependencies(acceptedValue.RuntimeDepends, InstallationReasonDependency)
+				checkDependencies(acceptedValue.MakeDepends, InstallationReasonMakeDependency)
+				checkDependencies(acceptedValue.CheckDepends, InstallationReasonMakeDependency)
+			}
+		}
+	}
+
+	dfs(pkgInfo, flags)
+
+	return resolved, unresolved
+}
+
+type DeconstructedPackageString struct {
+	PkgName                 string
+	Description             string
+	Flags                   map[string]string
+	RequiredVersionOperator string
+	RequiredVersion         string
+}
+
+func DeconstructPackageString(pkg string) (ret DeconstructedPackageString, err error) {
+	// Initialize values
+	ret.Flags = make(map[string]string)
+
+	// Get dependency description
+	if i := strings.IndexRune(pkg, ':'); i > 0 {
+		ret.Description = pkg[i+1:]
+		pkg = pkg[0:i]
+	}
+
+	if left := strings.IndexRune(pkg, '['); left > 0 {
+		if right := strings.IndexRune(pkg, ']'); right > left {
+			flagsStr := pkg[left+1 : right]
+			pkg = pkg[0:left] + pkg[right+1:]
+
+			if flagsStr != "" {
+				for flag := range strings.SplitSeq(flagsStr, ",") {
+					flagSplit := strings.SplitN(flag, "=", 2)
+					if len(flagSplit) != 2 {
+						return ret, fmt.Errorf("could not parse flag: %s", flag)
+					}
+
+					ret.Flags[flagSplit[0]] = flagSplit[1]
+				}
+			}
+		} else {
+			return ret, fmt.Errorf("could not find closing square bracket for set flags")
+		}
+	}
+
+	if strings.Contains(pkg, ">=") {
+		ret.RequiredVersionOperator = ">="
+	} else if strings.Contains(pkg, ">") {
+		ret.RequiredVersionOperator = ">"
+	} else if strings.Contains(pkg, "<=") {
+		ret.RequiredVersionOperator = "<="
+	} else if strings.Contains(pkg, "<") {
+		ret.RequiredVersionOperator = "<"
+	} else if strings.Contains(pkg, "=") {
+		ret.RequiredVersionOperator = "="
+	}
+	if ret.RequiredVersionOperator != "" {
+		pkgSplit := strings.SplitN(pkg, ret.RequiredVersionOperator, 2)
+		if len(pkgSplit) != 2 {
+			return ret, fmt.Errorf("could not parse required version: %s", pkg)
+		}
+		pkg = pkgSplit[0]
+		ret.RequiredVersion = pkgSplit[1]
+	}
+
+	ret.PkgName = pkg
+
+	return ret, nil
+}
+
+func EvaluatePackageString(pkgInfo *PackageInfo, match DeconstructedPackageString) bool {
+	// Validate flags
+	for flag, value := range match.Flags {
+		pkgFlagIndex := slices.IndexFunc(pkgInfo.Flags, func(f PackageFlag) bool {
+			return f.Name == flag
+		})
+		if pkgFlagIndex < 0 {
+			return false
+		}
+		pkgFlag := pkgInfo.Flags[pkgFlagIndex]
+
+		if pkgInfo.Type == "binary" {
+			if pkgFlag.BuiltValue != value {
+				return false
+			}
+		}
+
+		if len(pkgFlag.AcceptedValues) == 0 {
+			continue
+		}
+
+		if !slices.ContainsFunc(pkgFlag.AcceptedValues, func(acceptedFlag PackageAcceptedValue) bool {
+			return acceptedFlag.Value == value
+		}) {
+			return false
+		}
+	}
+
+	// Validate version
+	switch match.RequiredVersionOperator {
+	case ">=":
+		return CompareVersions(match.RequiredVersion, pkgInfo.Version) >= 0
+	case ">":
+		return CompareVersions(match.RequiredVersion, pkgInfo.Version) > 0
+	case "<=":
+		return CompareVersions(match.RequiredVersion, pkgInfo.Version) <= 0
+	case "<":
+		return CompareVersions(match.RequiredVersion, pkgInfo.Version) < 0
+	case "=":
+		if cutPkgVersion, ok := strings.CutSuffix(match.RequiredVersion, "*"); ok {
+			return strings.HasPrefix(pkgInfo.Version, cutPkgVersion)
+		} else {
+			return CompareVersions(pkgInfo.Version, match.RequiredVersion) == 0
+		}
+	default:
+		return true
+	}
+}
+
+func GetBuiltFlags(pkg, rootDir string) map[string]string {
+	builtFlags := make(map[string]string)
+
+	pkgInfo := GetPackageInfo(pkg, rootDir)
+	if pkgInfo == nil {
+		return nil
+	}
+
+	for _, flag := range pkgInfo.Flags {
+		builtFlags[flag.Name] = flag.BuiltValue
+	}
+
+	return builtFlags
+}
+
+func RemoveInvalidFlags(pkgInfo *PackageInfo, userFlags map[string]string) (ret map[string]string) {
+	ret = make(map[string]string)
+
+	for userFlag, userValue := range userFlags {
+		flagIndex := slices.IndexFunc(pkgInfo.Flags, func(flag PackageFlag) bool {
+			return flag.Name == userFlag
+		})
+		if flagIndex < 0 {
+			continue
+		}
+		flag := pkgInfo.Flags[flagIndex]
+
+		if len(flag.AcceptedValues) > 0 && !slices.ContainsFunc(flag.AcceptedValues, func(acceptedValue PackageAcceptedValue) bool {
+			return acceptedValue.Value == userValue
+		}) {
+			continue
+		}
+
+		ret[userFlag] = userValue
+	}
+
+	return ret
+}
+
+func CombineFlags(flags, newFlags map[string]string) (map[string]string, error) {
+	ret := make(map[string]string)
+	maps.Copy(ret, flags)
+
+	for flag, value := range newFlags {
+		if oldValue, ok := flags[flag]; ok && value != oldValue {
+			return ret, fmt.Errorf("flag already defined: %s=%s/%s", flag, oldValue, value)
+		}
+
+		ret[flag] = value
+	}
+
+	return ret, nil
+}

src/bpmlib/errors.go

@@ -2,23 +2,25 @@ package bpmlib
 
 import (
 	"fmt"
+	"maps"
+	"slices"
 	"strings"
 )
 
-type PackageNotFoundErr struct {
-	packages []string
+type PackageNotResolvedErr struct {
+	packages map[string]string
 }
 
-func (e PackageNotFoundErr) Error() string {
-	return "The following packages were not found in any databases: " + strings.Join(e.packages, ", ")
-}
+func (e PackageNotResolvedErr) Error() (ret string) {
+	ret = "The following packages could not be resolved:"
 
-type DependencyNotFoundErr struct {
-	dependencies []string
-}
+	keys := slices.Collect(maps.Keys(e.packages))
+	slices.Sort(keys)
+	for _, key := range keys {
+		ret += "\n  " + key + ": " + e.packages[key]
+	}
 
-func (e DependencyNotFoundErr) Error() string {
-	return "The following dependencies were not found in any databases: " + strings.Join(e.dependencies, ", ")
+	return ret
 }
 
 type PackageConflictErr struct {
@@ -27,6 +29,7 @@ type PackageConflictErr struct {
 }
 
 func (e PackageConflictErr) Error() string {
+	slices.Sort(e.conflicts)
 	return fmt.Sprintf("Package (%s) is in conflict with the following packages: %s", e.pkg, strings.Join(e.conflicts, ", "))
 
 }

src/bpmlib/general.go

@@ -11,21 +11,14 @@ import (
 	"strings"
 )
 
-type ReinstallMethod uint8
-
-const (
-	ReinstallMethodNone      ReinstallMethod = iota
-	ReinstallMethodSpecified ReinstallMethod = iota
-	ReinstallMethodAll       ReinstallMethod = iota
-)
-
 // InstallPackages installs the specified packages into the given root directory by fetching them from databases or directly from local bpm archives
-func InstallPackages(rootDir string, forceInstallationReason InstallationReason, reinstallMethod ReinstallMethod, installOptionalDependencies, forceInstallation, verbose bool, packages ...string) (operation *BPMOperation, err error) {
+func InstallPackages(rootDir string, forceInstallationReason InstallationReason, reinstallPackages bool, installRuntimeDependencies, forceInstallation, runChecks bool, verbose bool, packages ...string) (operation *BPMOperation, err error) {
 	// Setup operation struct
 	operation = &BPMOperation{
 		Actions:           make([]OperationAction, 0),
-		UnresolvedDepends: make([]string, 0),
-		Changes:           make(map[string]string),
+		UnresolvedDepends: make(map[string]string, 0),
+		ModifiedFiles:     make(map[string]string),
+		RunChecks:         runChecks,
 		RootDir:           rootDir,
 		compiledPackages:  make(map[string]string),
 	}
@@ -34,33 +27,79 @@ func InstallPackages(rootDir string, forceInstallationReason InstallationReason,
 	packages = removeDuplicates(packages)
 
 	// Resolve packages
-	pkgsNotFound := make([]string, 0)
+	unresolvedPackages := make(map[string]string)
+	resolvedVirtualPackages := make(map[string]string)
 	for _, pkg := range packages {
-		if stat, err := os.Stat(pkg); err == nil && !stat.IsDir() {
-			bpmpkg, err := ReadPackage(pkg)
+		d, err := DeconstructPackageString(pkg)
+		if err != nil {
+			return nil, fmt.Errorf("could not deconstruct package string: %s", err)
+		}
+
+		if stat, err := os.Stat(d.PkgName); err == nil && !stat.IsDir() {
+			bpmpkg, err := ReadPackage(d.PkgName)
 			if err != nil {
 				return nil, fmt.Errorf("could not read package: %s", err)
 			}
 
-			if bpmpkg.PkgInfo.Type == "source" && bpmpkg.PkgInfo.IsSplitPackage() {
+			// Add user defined package flags
+			if !reinstallPackages && IsPackageInstalled(bpmpkg.PkgInfo.Name, rootDir) {
+				d.Flags, err = CombineFlags(getPackageLocalInfo(bpmpkg.PkgInfo.Name, rootDir).Flags, d.Flags)
+				if err != nil {
+					return nil, fmt.Errorf("could not combine flags for package (%s): %s", bpmpkg.PkgInfo.Name, err)
+				}
+			}
+
+			if !EvaluatePackageString(bpmpkg.PkgInfo, d) {
+				unresolvedPackages[pkg] = "could not evaluate package"
+				continue
+			}
+
+			if bpmpkg.PkgInfo.IsSplitPackage() {
 				for _, splitPkg := range bpmpkg.PkgInfo.SplitPackages {
-					if reinstallMethod == ReinstallMethodNone && IsPackageInstalled(splitPkg.Name, rootDir) && GetPackageInfo(splitPkg.Name, rootDir).GetFullVersion() == splitPkg.GetFullVersion() {
+					if !reinstallPackages && IsPackageInstalled(splitPkg.Name, rootDir) && GetPackageInfo(splitPkg.Name, rootDir).GetFullVersion() == splitPkg.GetFullVersion() {
 						continue
 					}
 
+					// Check if installation can be ignored
+					if !reinstallPackages && IsPackageInstalled(splitPkg.Name, rootDir) {
+						shouldIgnore := true
+
+						// Skip if no update/downgrade is available
+						if GetPackageInfo(splitPkg.Name, rootDir).GetFullVersion() != splitPkg.GetFullVersion() {
+							shouldIgnore = false
+						}
+
+						// Skip if no new package flags
+						if !maps.Equal(getPackageLocalInfo(splitPkg.Name, rootDir).Flags, d.Flags) {
+							shouldIgnore = false
+						}
+
+						if shouldIgnore {
+							continue
+						}
+					}
+
 					// Set package installation reason
 					installationReason := forceInstallationReason
 					if installationReason == InstallationReasonUnknown {
 						if IsPackageInstalled(splitPkg.Name, rootDir) {
-							installationReason = GetInstallationReason(splitPkg.Name, rootDir)
+							installationReason = GetPackage(splitPkg.Name, rootDir).LocalInfo.GetInstallationReason()
 						} else {
 							installationReason = InstallationReasonManual
 						}
 					}
 
-					operation.AppendAction(&InstallPackageAction{
+					// Resolve virtual packages
+					for _, vpkg := range splitPkg.Provides {
+						if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+							resolvedVirtualPackages[vpkg] = splitPkg.Name
+						}
+					}
+
+					operation.Actions = append(operation.Actions, &InstallPackageAction{
 						File:                  pkg,
 						InstallationReason:    installationReason,
+						Flags:                 d.Flags,
 						BpmPackage:            bpmpkg,
 						SplitPackageToInstall: splitPkg.Name,
 					})
@@ -68,78 +107,132 @@ func InstallPackages(rootDir string, forceInstallationReason InstallationReason,
 				continue
 			}
 
-			if reinstallMethod == ReinstallMethodNone && IsPackageInstalled(bpmpkg.PkgInfo.Name, rootDir) && GetPackageInfo(bpmpkg.PkgInfo.Name, rootDir).GetFullVersion() == bpmpkg.PkgInfo.GetFullVersion() {
-				continue
+			// Check if installation can be ignored
+			if !reinstallPackages && IsPackageInstalled(bpmpkg.PkgInfo.Name, rootDir) {
+				shouldIgnore := true
+
+				// Skip if no update/downgrade is available
+				if GetPackageInfo(bpmpkg.PkgInfo.Name, rootDir).GetFullVersion() != bpmpkg.PkgInfo.GetFullVersion() {
+					shouldIgnore = false
+				}
+
+				// Skip if no new package flags
+				if !maps.Equal(getPackageLocalInfo(bpmpkg.PkgInfo.Name, rootDir).Flags, d.Flags) {
+					shouldIgnore = false
+				}
+
+				if shouldIgnore {
+					continue
+				}
 			}
 
 			// Set package installation reason
 			installationReason := forceInstallationReason
 			if installationReason == InstallationReasonUnknown {
 				if IsPackageInstalled(bpmpkg.PkgInfo.Name, rootDir) {
-					installationReason = GetInstallationReason(bpmpkg.PkgInfo.Name, rootDir)
+					installationReason = GetPackage(bpmpkg.PkgInfo.Name, rootDir).LocalInfo.GetInstallationReason()
 				} else {
 					installationReason = InstallationReasonManual
 				}
 			}
 
-			operation.AppendAction(&InstallPackageAction{
+			// Resolve virtual packages
+			for _, vpkg := range bpmpkg.PkgInfo.Provides {
+				if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+					resolvedVirtualPackages[vpkg] = bpmpkg.PkgInfo.Name
+				}
+			}
+
+			operation.Actions = append(operation.Actions, &InstallPackageAction{
 				File:               pkg,
 				InstallationReason: installationReason,
+				Flags:              d.Flags,
 				BpmPackage:         bpmpkg,
 			})
 		} else {
-			var entry *BPMDatabaseEntry
+			// Check resolved virtual packages
+			if resolvedPkg, ok := resolvedVirtualPackages[d.PkgName]; ok {
+				d.PkgName = resolvedPkg
+			}
 
-			if e, _, err := GetDatabaseEntry(pkg); err == nil {
-				entry = e
-			} else if isVirtual, p := IsVirtualPackage(pkg, rootDir); isVirtual {
-				entry, _, err = GetDatabaseEntry(p)
-				if err != nil {
-					pkgsNotFound = append(pkgsNotFound, pkg)
-					continue
-				}
-			} else if e := ResolveVirtualPackage(pkg); e != nil {
-				entry = e
-			} else {
-				pkgsNotFound = append(pkgsNotFound, pkg)
+			entry := ResolveDatabaseEntry(d, rootDir)
+			if entry == nil {
+				unresolvedPackages[pkg] = "could not find in any database"
 				continue
 			}
-			if reinstallMethod == ReinstallMethodNone && IsPackageInstalled(entry.Info.Name, rootDir) && GetPackageInfo(entry.Info.Name, rootDir).GetFullVersion() == entry.Info.GetFullVersion() {
-				continue
+
+			pkgInfo := GetPackageInfo(entry.Info.Name, rootDir)
+
+			// Add user defined package flags and resolve entry again if package is already installed
+			if !reinstallPackages && pkgInfo != nil {
+				d.Flags, err = CombineFlags(getPackageLocalInfo(entry.Info.Name, rootDir).Flags, d.Flags)
+				if err != nil {
+					return nil, fmt.Errorf("could not combine flags for package (%s): %s", entry.Info.Name, err)
+				}
+
+				entry = ResolveDatabaseEntry(d, rootDir)
+				if entry == nil {
+					unresolvedPackages[pkg] = "could not find in any database"
+					continue
+				}
+			}
+
+			// Check if installation can be ignored
+			if !reinstallPackages && pkgInfo != nil {
+				shouldIgnore := true
+
+				// Skip if no update/downgrade is available
+				if GetPackageInfo(entry.Info.Name, rootDir).GetFullVersion() != entry.Info.GetFullVersion() {
+					shouldIgnore = false
+				}
+
+				// Skip if no new package flags
+				if !maps.Equal(getPackageLocalInfo(entry.Info.Name, rootDir).Flags, d.Flags) {
+					shouldIgnore = false
+				}
+
+				if shouldIgnore {
+					continue
+				}
 			}
 
 			// Set package installation reason
 			installationReason := forceInstallationReason
 			if installationReason == InstallationReasonUnknown {
 				if IsPackageInstalled(entry.Info.Name, rootDir) {
-					installationReason = GetInstallationReason(entry.Info.Name, rootDir)
+					installationReason = GetPackage(entry.Info.Name, rootDir).LocalInfo.GetInstallationReason()
 				} else {
 					installationReason = InstallationReasonManual
 				}
 			}
 
-			operation.AppendAction(&FetchPackageAction{
+			// Resolve virtual packages
+			for _, vpkg := range entry.Info.Provides {
+				if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+					resolvedVirtualPackages[vpkg] = entry.Info.Name
+				}
+			}
+
+			operation.Actions = append(operation.Actions, &FetchPackageAction{
 				InstallationReason: installationReason,
+				Flags:              d.Flags,
 				DatabaseEntry:      entry,
 			})
 		}
 	}
 
 	// Return error if not all packages are found
-	if len(pkgsNotFound) != 0 {
-		return nil, PackageNotFoundErr{pkgsNotFound}
+	if len(unresolvedPackages) != 0 {
+		return nil, PackageNotResolvedErr{unresolvedPackages}
 	}
 
 	// Resolve dependencies
-	err = operation.ResolveDependencies(reinstallMethod == ReinstallMethodAll, installOptionalDependencies, verbose)
-	if err != nil {
-		return nil, fmt.Errorf("could not resolve dependencies: %s", err)
-	}
+	operation.ResolveDependencies(installRuntimeDependencies)
 	if len(operation.UnresolvedDepends) != 0 {
 		if !forceInstallation {
-			return nil, DependencyNotFoundErr{operation.UnresolvedDepends}
+			return nil, PackageNotResolvedErr{operation.UnresolvedDepends}
 		} else if verbose {
-			log.Printf("Warning: %s", DependencyNotFoundErr{operation.UnresolvedDepends})
+			log.Printf("Warning: %s", PackageNotResolvedErr{operation.UnresolvedDepends})
 		}
 	}
 
@@ -189,8 +282,8 @@ func InstallPackages(rootDir string, forceInstallationReason InstallationReason,
 func RemovePackages(rootDir string, force, cleanupDependencies bool, packages ...string) (operation *BPMOperation, err error) {
 	operation = &BPMOperation{
 		Actions:           make([]OperationAction, 0),
-		UnresolvedDepends: make([]string, 0),
-		Changes:           make(map[string]string),
+		UnresolvedDepends: make(map[string]string),
+		ModifiedFiles:     make(map[string]string),
 		RootDir:           rootDir,
 		compiledPackages:  make(map[string]string),
 	}
@@ -201,13 +294,13 @@ func RemovePackages(rootDir string, force, cleanupDependencies bool, packages ..
 	// Search for packages
 	for _, pkg := range packages {
 		bpmpkg := GetPackage(pkg, rootDir)
-		if isVirutal, vpkg := IsVirtualPackage(pkg, rootDir); isVirutal {
-			bpmpkg = GetPackage(vpkg, rootDir)
+		if providers := GetVirtualPackageInfo(pkg, rootDir); len(providers) > 0 {
+			bpmpkg = GetPackage(providers[0].Name, rootDir)
 		}
 		if bpmpkg == nil {
 			continue
 		}
-		operation.AppendAction(&RemovePackageAction{BpmPackage: bpmpkg})
+		operation.Actions = append(operation.Actions, &RemovePackageAction{BpmPackage: bpmpkg})
 	}
 
 	// Do package cleanup
@@ -223,12 +316,12 @@ func RemovePackages(rootDir string, force, cleanupDependencies bool, packages ..
 		// Get packages and their dependants
 		packageDepndants := make(map[string][]string, 0)
 		for _, action := range operation.Actions {
-			// Skip package if ignored
-			if slices.Contains(MainBPMConfig.IgnorePackages, action.(*RemovePackageAction).BpmPackage.PkgInfo.Name) {
+			// Skip package if ignored in config
+			if rootDir == "/" && slices.Contains(MainBPMConfig.IgnorePackages, action.(*RemovePackageAction).BpmPackage.PkgInfo.Name) {
 				continue
 			}
 
-			dependants := action.(*RemovePackageAction).BpmPackage.PkgInfo.GetPackageDependants(rootDir)
+			dependants := action.(*RemovePackageAction).BpmPackage.PkgInfo.GetPackageDependants(rootDir, true)
 			packageDepndants[action.(*RemovePackageAction).BpmPackage.PkgInfo.Name] = dependants
 		}
 
@@ -244,7 +337,7 @@ func RemovePackages(rootDir string, force, cleanupDependencies bool, packages ..
 		// Remove dependant packages if ignored
 		for pkg, required := range packageDepndants {
 			required = slices.DeleteFunc(required, func(pkgName string) bool {
-				return slices.Contains(MainBPMConfig.IgnorePackages, pkgName)
+				return rootDir == "/" && slices.Contains(MainBPMConfig.IgnorePackages, pkgName)
 			})
 			packageDepndants[pkg] = required
 		}
@@ -267,8 +360,8 @@ func RemovePackages(rootDir string, force, cleanupDependencies bool, packages ..
 func CleanupPackages(cleanupMakeDepends bool, rootDir string) (operation *BPMOperation, err error) {
 	operation = &BPMOperation{
 		Actions:           make([]OperationAction, 0),
-		UnresolvedDepends: make([]string, 0),
-		Changes:           make(map[string]string),
+		UnresolvedDepends: make(map[string]string),
+		ModifiedFiles:     make(map[string]string),
 		RootDir:           rootDir,
 		compiledPackages:  make(map[string]string),
 	}
@@ -365,7 +458,7 @@ func CleanupCache(rootDir string, cleanupCompilationFiles, cleanupCompiledPackag
 }
 
 // UpdatePackages fetches the newest versions of all installed packages from
-func UpdatePackages(rootDir string, syncDatabase bool, allowDowngrades bool, installOptionalDependencies, forceInstallation, verbose bool) (operation *BPMOperation, err error) {
+func UpdatePackages(rootDir string, syncDatabase, allowDowngrades, forceInstallation, runChecks, verbose bool) (operation *BPMOperation, err error) {
 	// Sync databases
 	if syncDatabase {
 		err := SyncDatabase(verbose)
@@ -395,49 +488,64 @@ func UpdatePackages(rootDir string, syncDatabase bool, allowDowngrades bool, ins
 
 	operation = &BPMOperation{
 		Actions:           make([]OperationAction, 0),
-		UnresolvedDepends: make([]string, 0),
-		Changes:           make(map[string]string),
+		UnresolvedDepends: make(map[string]string),
+		ModifiedFiles:     make(map[string]string),
+		RunChecks:         runChecks,
 		RootDir:           rootDir,
 		compiledPackages:  make(map[string]string),
 	}
 
 	// Search for packages
+	resolvedVirtualPackages := make(map[string]string)
 	for _, pkg := range pkgs {
-		if slices.Contains(MainBPMConfig.IgnorePackages, pkg) {
+		if rootDir == "/" && slices.Contains(MainBPMConfig.IgnorePackages, pkg) {
 			continue
 		}
+
+		// Get installed package built flags
+		flags := getPackageLocalInfo(pkg, rootDir).Flags
+
 		var entry *BPMDatabaseEntry
 		// Check if installed package can be replaced and install that instead
 		if e := FindReplacement(pkg); e != nil {
 			entry = e
-		} else if entry, _, err = GetDatabaseEntry(pkg); err != nil {
+		} else if entry = ResolveDatabaseEntry(DeconstructedPackageString{PkgName: pkg, Flags: flags}, rootDir); entry == nil {
 			continue
 		}
 
-		installedInfo := GetPackageInfo(pkg, rootDir)
-		if installedInfo == nil {
+		// Remove invalid flags
+		flags = RemoveInvalidFlags(entry.Info, flags)
+
+		if installedInfo := GetPackageInfo(pkg, rootDir); installedInfo == nil {
 			return nil, fmt.Errorf("could not get package info for package (%s)", pkg)
 		} else {
 			comparison := CompareVersions(entry.Info.GetFullVersion(), installedInfo.GetFullVersion())
 			if (!allowDowngrades && comparison > 0) || (allowDowngrades && comparison != 0) {
-				operation.AppendAction(&FetchPackageAction{
-					InstallationReason: GetInstallationReason(pkg, rootDir),
+				// Resolve virtual packages
+				for _, vpkg := range entry.Info.Provides {
+					if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+						resolvedVirtualPackages[vpkg] = entry.Info.Name
+					}
+				}
+
+				bpmpkg := GetPackage(pkg, rootDir)
+
+				operation.Actions = append(operation.Actions, &FetchPackageAction{
+					InstallationReason: bpmpkg.LocalInfo.GetInstallationReason(),
+					Flags:              flags,
 					DatabaseEntry:      entry,
 				})
 			}
 		}
 	}
 
-	// Check for new dependencies in updated packages
-	err = operation.ResolveDependencies(false, installOptionalDependencies, verbose)
-	if err != nil {
-		return nil, fmt.Errorf("could not resolve dependencies: %s", err)
-	}
+	// Resolve dependencies
+	operation.ResolveDependencies(true)
 	if len(operation.UnresolvedDepends) != 0 {
 		if !forceInstallation {
-			return nil, DependencyNotFoundErr{operation.UnresolvedDepends}
+			return nil, PackageNotResolvedErr{operation.UnresolvedDepends}
 		} else if verbose {
-			log.Printf("Warning: %s", DependencyNotFoundErr{operation.UnresolvedDepends})
+			log.Printf("Warning: %s", PackageNotResolvedErr{operation.UnresolvedDepends})
 		}
 	}
 

src/bpmlib/gpg.go

@@ -0,0 +1,216 @@
+package bpmlib
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+)
+
+func InitializeKeyring(rootDir string) error {
+	gpgHomedir := path.Join(rootDir, "/var/lib/bpm/gpg")
+
+	// Create GPG directory
+	err := os.Mkdir(gpgHomedir, 0700)
+	if err != nil && !os.IsExist(err) {
+		return err
+	}
+
+	// Get number of secret keys
+	cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--list-secret-keys", "--with-colons")
+	output, err := cmd.Output()
+	if err != nil {
+		return err
+	}
+	secretKeysLineCount := len(strings.Split(strings.TrimSpace(string(output)), "\n"))
+
+	// Create signing key
+	if secretKeysLineCount <= 1 {
+		cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--batch", "--gen-key")
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		cmd.Stdin = strings.NewReader(`%echo Creating signing key...
+Key-Type: RSA
+Key-Length: 4096
+Key-Usage: sign
+Name-Real: BPM signing key
+Name-Email: bpm@localhost
+Expire-Date: 0
+%no-protection
+%commit
+%echo Done`)
+
+		err = cmd.Run()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func IsKeyringInitialized(rootDir string) bool {
+	gpgHomedir := path.Join(rootDir, "/var/lib/bpm/gpg")
+
+	// Check if gpg directory exists
+	if stat, err := os.Stat(gpgHomedir); err != nil || !stat.IsDir() {
+		return false
+	}
+
+	// Get number of secret keys
+	cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--list-secret-keys", "--with-colons")
+	output, err := cmd.Output()
+	if err != nil {
+		return false
+	}
+	secretKeysLineCount := len(strings.Split(strings.TrimSpace(string(output)), "\n"))
+
+	// Return false if no signing key has been created
+	if secretKeysLineCount <= 1 {
+		return false
+	}
+
+	return true
+}
+
+func PopulateKeyring(rootDir string) error {
+	gpgHomedir := path.Join(rootDir, "/var/lib/bpm/gpg")
+	keyringsDir := path.Join(rootDir, "/var/lib/bpm/keyrings")
+
+	dirEntries, err := os.ReadDir(keyringsDir)
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+
+	// Remove removed keys
+	for _, entry := range dirEntries {
+		if entry.IsDir() {
+			continue
+		}
+		if !strings.HasSuffix(entry.Name(), ".revoked") {
+			continue
+		}
+
+		data, err := os.ReadFile(path.Join(keyringsDir, entry.Name()))
+		if err != nil {
+			return err
+		}
+
+		// Loop over all key IDs
+		for entry := range strings.SplitSeq(strings.TrimSpace(string(data)), "\n") {
+			// Ensure key ID exists
+			err := exec.Command("gpg", "--homedir="+gpgHomedir, "--list-keys", entry).Run()
+			if err != nil {
+				continue
+			}
+
+			cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--batch", "--yes", "--delete-secret-and-public-keys", entry)
+
+			err = cmd.Run()
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	// Import all keyrings
+	for _, entry := range dirEntries {
+		if entry.IsDir() {
+			continue
+		}
+		if !strings.HasSuffix(entry.Name(), ".pgp") && !strings.HasSuffix(entry.Name(), ".asc") {
+			continue
+		}
+
+		cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--import", path.Join(keyringsDir, entry.Name()))
+
+		err := cmd.Run()
+		if err != nil {
+			return err
+		}
+	}
+
+	// Trust keys
+	for _, entry := range dirEntries {
+		if entry.IsDir() {
+			continue
+		}
+		if !strings.HasSuffix(entry.Name(), ".trustdb") {
+			continue
+		}
+
+		data, err := os.ReadFile(path.Join(keyringsDir, entry.Name()))
+		if err != nil {
+			return err
+		}
+
+		// Loop over all key IDs
+		for entry := range strings.SplitSeq(strings.TrimSpace(string(data)), "\n") {
+			keyID := strings.Split(entry, ":")[0]
+
+			// Ensure key ID exists
+			err := exec.Command("gpg", "--homedir="+gpgHomedir, "--list-keys", keyID).Run()
+			if err != nil {
+				continue
+			}
+
+			// Sign key
+			cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--command-fd=0", "--batch", "--lsign-key", keyID)
+			cmd.Stdin = strings.NewReader("y\ny\n")
+
+			err = cmd.Run()
+			if err != nil {
+				return err
+			}
+		}
+
+		// Import owner trust database
+		cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--import-ownertrust", path.Join(keyringsDir, entry.Name()))
+
+		err = cmd.Run()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func VerifySignature(filename, signature string, requireTrusted bool, rootDir string) error {
+	gpgHomedir := path.Join(rootDir, "/var/lib/bpm/gpg")
+
+	if _, err := os.Stat(gpgHomedir); err != nil {
+		return err
+	}
+
+	cmd := exec.Command("gpg", "--homedir="+gpgHomedir, "--status-fd=3", "--verify", signature, filename)
+	pipeReader, pipeWriter, err := os.Pipe()
+	if err != nil {
+		return err
+	}
+	defer pipeReader.Close()
+	defer pipeWriter.Close()
+	cmd.ExtraFiles = append(cmd.ExtraFiles, pipeWriter)
+
+	err = cmd.Run()
+	if err != nil {
+		return err
+	}
+	pipeWriter.Close()
+
+	if requireTrusted {
+		data, err := io.ReadAll(pipeReader)
+		if err != nil {
+			return err
+		}
+
+		dataStr := string(data)
+		if !strings.Contains(dataStr, "[GNUPG:] TRUST_FULLY") && !strings.Contains(dataStr, "[GNUPG:] TRUST_ULTIMATE") {
+			return fmt.Errorf("signature verified but not trusted")
+		}
+	}
+
+	return err
+}

src/bpmlib/hooks.go

@@ -1,26 +1,27 @@
 package bpmlib
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
-	"gopkg.in/yaml.v3"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
 	"slices"
 	"strings"
 	"syscall"
+
+	"gopkg.in/yaml.v3"
 )
 
 type BPMHook struct {
-	SourcePath        string
-	SourceContent     string
-	TriggerOperations []string `yaml:"trigger_operations"`
-	TargetType        string   `yaml:"target_type"`
-	Targets           []string `yaml:"targets"`
-	Depends           []string `yaml:"depends"`
-	Run               string   `yaml:"run"`
+	SourcePath          string
+	SourceContent       string
+	TriggerActions      []string `yaml:"trigger_actions"`
+	TriggerPreOperation bool     `yaml:"trigger_pre_operation"`
+	Targets             []string `yaml:"targets"`
+	Run                 string   `yaml:"run"`
+	PassTargets         bool     `yaml:"pass_targets"`
 }
 
 // createHook returns a BPMHook instance based on the content of the given string
@@ -33,13 +34,11 @@ func createHook(sourcePath string) (*BPMHook, error) {
 
 	// Create base hook structure
 	hook := &BPMHook{
-		SourcePath:        sourcePath,
-		SourceContent:     string(bytes),
-		TriggerOperations: nil,
-		TargetType:        "",
-		Targets:           nil,
-		Depends:           nil,
-		Run:               "",
+		SourcePath:     sourcePath,
+		SourceContent:  string(bytes),
+		TriggerActions: nil,
+		Targets:        nil,
+		Run:            "",
 	}
 
 	// Unmarshal yaml string
@@ -61,19 +60,15 @@ func (hook *BPMHook) IsValid() error {
 	ValidOperations := []string{"install", "upgrade", "remove"}
 
 	// Return error if any trigger operation is not valid or none are given
-	if len(hook.TriggerOperations) == 0 {
+	if len(hook.TriggerActions) == 0 {
 		return errors.New("no trigger operations specified")
 	}
-	for _, operation := range hook.TriggerOperations {
+	for _, operation := range hook.TriggerActions {
 		if !slices.Contains(ValidOperations, operation) {
 			return errors.New("trigger operation '" + operation + "' is not valid")
 		}
 	}
 
-	if hook.TargetType != "package" && hook.TargetType != "path" {
-		return errors.New("target type '" + hook.TargetType + "' is not valid")
-	}
-
 	if len(hook.Run) == 0 {
 		return errors.New("command to run is empty")
 	}
@@ -83,55 +78,30 @@ func (hook *BPMHook) IsValid() error {
 }
 
 // Execute hook if all conditions are met
-func (hook *BPMHook) Execute(packageChanges map[string]string, verbose bool, rootDir string) error {
-	// Check if package dependencies are met
-	installedPackages, err := GetInstalledPackages(rootDir)
-	if err != nil {
-		return err
-	}
-
-	for _, depend := range hook.Depends {
-		if !slices.Contains(installedPackages, depend) {
-			return nil
-		}
-	}
-
-	// Get modified files slice
-	modifiedFiles := make([]*PackageFileEntry, 0)
-	for pkg := range packageChanges {
-		if GetPackage(pkg, rootDir) != nil {
-			modifiedFiles = append(modifiedFiles, GetPackage(pkg, rootDir).PkgFiles...)
-		}
-
-	}
-
+func (hook *BPMHook) Execute(modifiedFiles map[string]string, preOperation bool, verbose bool, rootDir string) error {
 	// Check if any targets are met
-	targetMet := false
+	targetsMet := make([]string, 0)
 	for _, target := range hook.Targets {
-		if targetMet {
-			break
-		}
-		if hook.TargetType == "package" {
-			for change, operation := range packageChanges {
-				if target == change && slices.Contains(hook.TriggerOperations, operation) {
-					targetMet = true
-					break
-				}
+		for modifiedFile, action := range modifiedFiles {
+			// Check if this hook is triggered by this file's action
+			if !slices.Contains(hook.TriggerActions, action) {
+				continue
 			}
-		} else {
-			glob, err := filepath.Glob(path.Join(rootDir, target))
-			if err != nil {
-				return err
+
+			// Check if file has already been checked
+			if slices.Contains(targetsMet, modifiedFile) {
+				continue
 			}
-			for _, change := range modifiedFiles {
-				if slices.Contains(glob, path.Join(rootDir, change.Path)) {
-					targetMet = true
-					break
-				}
+
+			if matched, _ := filepath.Match(target, modifiedFile); !matched {
+				continue
 			}
+
+			targetsMet = append(targetsMet, modifiedFile)
 		}
 	}
-	if !targetMet {
+
+	if len(targetsMet) == 0 {
 		return nil
 	}
 
@@ -140,16 +110,25 @@ func (hook *BPMHook) Execute(packageChanges map[string]string, verbose bool, roo
 	cmd := exec.Command(splitCommand[0], splitCommand[1:]...)
 	// Setup subprocess environment
 	cmd.Dir = "/"
+	// Pass targets
+	if hook.PassTargets {
+		buffer := bytes.Buffer{}
+		buffer.WriteString(strings.Join(targetsMet, "\n") + "\n")
+
+		cmd.Stdin = &buffer
+	}
 	// Run hook in chroot if using the -R flag
 	if rootDir != "/" {
 		cmd.SysProcAttr = &syscall.SysProcAttr{Chroot: rootDir}
 	}
 
-	if verbose {
-		fmt.Printf("Running hook (%s) with run command: %s\n", hook.SourcePath, strings.Join(splitCommand, " "))
+	if !verbose {
+		fmt.Printf("Running hook (%s)\n", filepath.Base(hook.SourcePath))
+	} else {
+		fmt.Printf("Running hook (%s) with run command: %s\n", filepath.Base(hook.SourcePath), strings.Join(splitCommand, " "))
 	}
 
-	err = cmd.Run()
+	err := cmd.Run()
 	if err != nil {
 		return err
 	}

src/bpmlib/installed_packages.go

@@ -4,23 +4,46 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"path/filepath"
 	"slices"
 	"strconv"
 	"strings"
+
+	"gopkg.in/yaml.v3"
 )
 
-var localPackageInformation map[string]map[string]*PackageInfo = make(map[string]map[string]*PackageInfo)
+var persistentDataVersion int = 1
 
-func initializeLocalPackageInformation(rootDir string) (err error) {
+var localPackageInformation map[string]map[string]*PackageInfo = make(map[string]map[string]*PackageInfo)
+var installedVirtualPackages map[string]map[string][]*PackageInfo = make(map[string]map[string][]*PackageInfo)
+
+func InitializeLocalPackageInformation(rootDir string) (err error) {
 	// Return if information is already initialized
 	if _, ok := localPackageInformation[rootDir]; ok {
 		return nil
 	}
 
 	tempPackageInformation := make(map[string]*PackageInfo)
+	tempInstalledVirtualPackages := make(map[string][]*PackageInfo)
 
-	// Get path to installed package information directory
-	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
+	// Get paths
+	persistentDataDir := path.Join(rootDir, "var/lib/bpm")
+	installedDir := path.Join(persistentDataDir, "installed")
+
+	// Ensure persistent data directory is up-to-date
+	if _, err := os.Stat(persistentDataDir); err == nil {
+		data, err := os.ReadFile(path.Join(persistentDataDir, ".version"))
+		if err != nil {
+			return fmt.Errorf("persistent data is not up-to-date! Please run 'bpm upgrade-persistent-data' first")
+		}
+		currentPersistentDataVersion, err := strconv.Atoi(strings.TrimSpace(string(data)))
+		if err != nil {
+			return fmt.Errorf("persistent data is not up-to-date! Please run 'bpm upgrade-persistent-data' first")
+		}
+		if currentPersistentDataVersion != persistentDataVersion {
+			return fmt.Errorf("persistent data is not up-to-date! Please run 'bpm upgrade-persistent-data' first")
+		}
+	}
 
 	// Get directory content
 	items, err := os.ReadDir(installedDir)
@@ -40,7 +63,7 @@ func initializeLocalPackageInformation(rootDir string) (err error) {
 		}
 
 		// Read package info
-		infoData, err := os.ReadFile(path.Join(installedDir, item.Name(), "info"))
+		infoData, err := os.ReadFile(path.Join(installedDir, item.Name(), "info.yml"))
 		if err != nil {
 			return err
 		}
@@ -51,15 +74,21 @@ func initializeLocalPackageInformation(rootDir string) (err error) {
 
 		// Add package to slice
 		tempPackageInformation[info.Name] = info
+
+		// Add virtual packages
+		for _, vpkg := range info.Provides {
+			tempInstalledVirtualPackages[vpkg] = append(tempInstalledVirtualPackages[vpkg], info)
+		}
 	}
 
 	localPackageInformation[rootDir] = tempPackageInformation
+	installedVirtualPackages[rootDir] = tempInstalledVirtualPackages
 	return nil
 }
 
 func GetInstalledPackages(rootDir string) (ret []string, err error) {
 	// Initialize local package information
-	err = initializeLocalPackageInformation(rootDir)
+	err = InitializeLocalPackageInformation(rootDir)
 	if err != nil {
 		return nil, err
 	}
@@ -75,9 +104,44 @@ func GetInstalledPackages(rootDir string) (ret []string, err error) {
 	return ret, nil
 }
 
+func GetPathOwners(path, rootDir string) (ret []string, err error) {
+	// Get absolte path to path
+	path, err = filepath.Abs(path)
+	if err != nil {
+		return
+	}
+
+	path, err = filepath.Rel(rootDir, path)
+	if err != nil {
+		return
+	}
+
+	// Trim leading and trailing slashes
+	path = strings.TrimLeft(path, "/")
+	path = strings.TrimRight(path, "/")
+
+	// Get installed packages
+	pkgs, err := GetInstalledPackages(rootDir)
+	if err != nil {
+		return
+	}
+
+	// Add packages that own path to list
+	for _, pkg := range pkgs {
+		pkgFiles := getPackageFiles(pkg, rootDir)
+		if slices.ContainsFunc(pkgFiles, func(entry *PackageFileEntry) bool {
+			return entry.Path == path
+		}) {
+			ret = append(ret, pkg)
+		}
+	}
+
+	return ret, nil
+}
+
 func IsPackageInstalled(pkg, rootDir string) bool {
 	// Initialize local package information
-	err := initializeLocalPackageInformation(rootDir)
+	err := InitializeLocalPackageInformation(rootDir)
 	if err != nil {
 		return false
 	}
@@ -88,48 +152,22 @@ func IsPackageInstalled(pkg, rootDir string) bool {
 	return true
 }
 
-func IsVirtualPackage(pkg, rootDir string) (bool, string) {
-	pkgs, err := GetInstalledPackages(rootDir)
+func GetVirtualPackageInfo(vpkg, rootDir string) []*PackageInfo {
+	err := InitializeLocalPackageInformation(rootDir)
 	if err != nil {
-		return false, ""
+		return nil
 	}
-	for _, p := range pkgs {
-		if p == pkg {
-			return false, ""
-		}
-		i := GetPackageInfo(p, rootDir)
-		if i == nil {
-			continue
-		}
-		if slices.Contains(i.Provides, pkg) {
-			return true, p
-		}
-	}
-	return false, ""
-}
 
-func IsPackageProvided(pkg, rootDir string) bool {
-	pkgs, err := GetInstalledPackages(rootDir)
-	if err != nil {
-		return false
-	}
-	for _, p := range pkgs {
-		if p == pkg {
-			return true
-		}
-		i := GetPackageInfo(p, rootDir)
-		if i == nil {
-			continue
-		}
-		if slices.Contains(i.Provides, pkg) {
-			return true
-		}
-	}
-	return false
+	providers := installedVirtualPackages[rootDir][vpkg]
+	slices.SortFunc(providers, func(a, b *PackageInfo) int {
+		return strings.Compare(a.Name, b.Name)
+	})
+
+	return providers
 }
 
 func GetPackageInfo(pkg string, rootDir string) *PackageInfo {
-	err := initializeLocalPackageInformation(rootDir)
+	err := InitializeLocalPackageInformation(rootDir)
 	if err != nil {
 		return nil
 	}
@@ -144,10 +182,12 @@ func GetPackage(pkg, rootDir string) *BPMPackage {
 	}
 
 	files := getPackageFiles(pkgInfo.Name, rootDir)
+	localInfo := getPackageLocalInfo(pkgInfo.Name, rootDir)
 
 	return &BPMPackage{
-		PkgInfo:  pkgInfo,
-		PkgFiles: files,
+		PkgInfo:   pkgInfo,
+		PkgFiles:  files,
+		LocalInfo: localInfo,
 	}
 }
 
@@ -180,7 +220,7 @@ func getPackageFiles(pkg, rootDir string) []*PackageFileEntry {
 	var pkgFiles []*PackageFileEntry
 	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
 	pkgDir := path.Join(installedDir, pkg)
-	files := path.Join(pkgDir, "files")
+	files := path.Join(pkgDir, "files.txt")
 	if _, err := os.Stat(installedDir); os.IsNotExist(err) {
 		return nil
 	}
@@ -234,3 +274,154 @@ func getPackageFiles(pkg, rootDir string) []*PackageFileEntry {
 
 	return pkgFiles
 }
+
+func getPackageLocalInfo(pkg, rootDir string) PackageLocalInfo {
+	localInfo := PackageLocalInfo{}
+
+	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
+	pkgDir := path.Join(installedDir, pkg)
+	localInfoFile := path.Join(path.Join(pkgDir, "local.yml"))
+
+	if _, err := os.Stat(localInfoFile); os.IsNotExist(err) {
+		return localInfo
+	}
+
+	file, err := os.Open(localInfoFile)
+	if err != nil {
+		return localInfo
+	}
+	defer file.Close()
+
+	err = yaml.NewDecoder(file).Decode(&localInfo)
+	if err != nil {
+		return localInfo
+	}
+
+	return localInfo
+}
+
+func SetPackageLocalInfo(pkg string, localInfo PackageLocalInfo, rootDir string) error {
+	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
+	pkgDir := path.Join(installedDir, pkg)
+
+	localFile, err := os.OpenFile(path.Join(pkgDir, "local.yml"), os.O_WRONLY|os.O_CREATE, 0644)
+	if err != nil {
+		return err
+	}
+	defer localFile.Close()
+
+	err = yaml.NewEncoder(localFile).Encode(localInfo)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func UpgradePersistentData(rootDir string) error {
+	persistentDataDir := path.Join(rootDir, "var/lib/bpm")
+
+	// Create persistent data directory
+	os.MkdirAll(persistentDataDir, 0755)
+
+	// Upgrade installed package directories
+	dirEntries, err := os.ReadDir(path.Join(persistentDataDir, "installed"))
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	} else if err == nil {
+		for _, entry := range dirEntries {
+			pkgDir := path.Join(persistentDataDir, "installed", entry.Name())
+
+			// Rename 'info' file to 'info.yml'
+			if _, err := os.Stat(path.Join(pkgDir, "info")); err == nil {
+				fmt.Printf("Moving 'info' to 'info.yml' for package (%s)\n", entry.Name())
+				err := os.Rename(path.Join(pkgDir, "info"), path.Join(pkgDir, "info.yml"))
+				if err != nil {
+					return err
+				}
+			}
+
+			// Rename 'files' file to 'files.txt'
+			if _, err := os.Stat(path.Join(pkgDir, "files")); err == nil {
+				fmt.Printf("Moving 'files' to 'files.txt' for package (%s)\n", entry.Name())
+				err := os.Rename(path.Join(pkgDir, "files"), path.Join(pkgDir, "files.txt"))
+				if err != nil {
+					return err
+				}
+			}
+
+			// Rename 'local' file to 'local.yml'
+			if _, err := os.Stat(path.Join(pkgDir, "local")); err == nil {
+				fmt.Printf("Moving 'local' to 'local.yml' for package (%s)\n", entry.Name())
+				err := os.Rename(path.Join(pkgDir, "local"), path.Join(pkgDir, "local.yml"))
+				if err != nil {
+					return err
+				}
+			}
+
+			// Generate default local package information file
+			if _, err := os.Stat(path.Join(pkgDir, "local.yml")); os.IsNotExist(err) {
+				fmt.Printf("Generating local package information for package (%s)\n", entry.Name())
+
+				out, err := yaml.Marshal(PackageLocalInfo{
+					InstallationReason: "unknown",
+					InstalledOn:        0,
+					LastUpdatedOn:      0,
+				})
+				if err != nil {
+					return err
+				}
+
+				err = os.WriteFile(path.Join(pkgDir, "local.yml"), out, 0644)
+				if err != nil {
+					return err
+				}
+			} else if err != nil {
+				return err
+			}
+
+			// Move installation reason to local package information file
+			if installationReason, err := os.ReadFile(path.Join(pkgDir, "installation_reason")); err != nil && !os.IsNotExist(err) {
+				return err
+			} else if err == nil {
+				fmt.Printf("Moving installation reason to local package information for package (%s)\n", entry.Name())
+
+				data, err := os.ReadFile(path.Join(pkgDir, "local.yml"))
+				if err != nil {
+					return err
+				}
+
+				localInfo := &PackageLocalInfo{}
+				err = yaml.Unmarshal(data, localInfo)
+				if err != nil {
+					return err
+				}
+
+				localInfo.InstallationReason = strings.TrimSpace(string(installationReason))
+
+				out, err := yaml.Marshal(localInfo)
+				if err != nil {
+					return err
+				}
+
+				err = os.WriteFile(path.Join(pkgDir, "local.yml"), out, 0644)
+				if err != nil {
+					return err
+				}
+
+				err = os.Remove(path.Join(pkgDir, "installation_reason"))
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	// Set persistent data version number
+	err = os.WriteFile(path.Join(persistentDataDir, ".version"), []byte(strconv.Itoa(persistentDataVersion)), 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

src/bpmlib/net.go

@@ -39,7 +39,7 @@ func downloadFile(barText, u, filepath string, perm os.FileMode) error {
 	defer file.Close()
 
 	// Create progress bar
-	bar := createProgressBar(resp.ContentLength, barText, false)
+	bar := createProgressBar(resp.ContentLength, barText, barText == "")
 	defer bar.Close()
 
 	// Copy data

src/bpmlib/operations.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"maps"
 	"os"
 	"path"
 	"slices"
@@ -13,80 +14,16 @@ import (
 
 type BPMOperation struct {
 	Actions           []OperationAction
-	UnresolvedDepends []string
-	Changes           map[string]string
+	UnresolvedDepends map[string]string
+	ModifiedFiles     map[string]string
+	CompilationJobs   int
+	RunChecks         bool
 	RootDir           string
 
 	compiledPackages   map[string]string
 	hasFetchedPackages bool
 }
 
-func (operation *BPMOperation) ActionsContainPackage(pkg string) bool {
-	for _, action := range operation.Actions {
-		if action.GetActionType() == "install" {
-			if action.(*InstallPackageAction).BpmPackage.PkgInfo.Name == pkg {
-				return true
-			}
-		} else if action.GetActionType() == "fetch" {
-			if action.(*FetchPackageAction).DatabaseEntry.Info.Name == pkg {
-				return true
-			}
-		} else if action.GetActionType() == "remove" {
-			if action.(*RemovePackageAction).BpmPackage.PkgInfo.Name == pkg {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-func (operation *BPMOperation) AppendAction(action OperationAction) {
-	operation.InsertActionAt(len(operation.Actions), action)
-}
-
-func (operation *BPMOperation) InsertActionAt(index int, action OperationAction) {
-	if len(operation.Actions) == index { // nil or empty slice or after last element
-		operation.Actions = append(operation.Actions, action)
-	} else {
-		operation.Actions = append(operation.Actions[:index+1], operation.Actions[index:]...) // index < len(a)
-		operation.Actions[index] = action
-	}
-
-	if action.GetActionType() == "install" {
-		pkgInfo := action.(*InstallPackageAction).BpmPackage.PkgInfo
-		if !IsPackageInstalled(pkgInfo.Name, operation.RootDir) {
-			operation.Changes[pkgInfo.Name] = "install"
-		} else {
-			operation.Changes[pkgInfo.Name] = "upgrade"
-		}
-	} else if action.GetActionType() == "fetch" {
-		pkgInfo := action.(*FetchPackageAction).DatabaseEntry.Info
-		if !IsPackageInstalled(pkgInfo.Name, operation.RootDir) {
-			operation.Changes[pkgInfo.Name] = "install"
-		} else {
-			operation.Changes[pkgInfo.Name] = "upgrade"
-		}
-	} else if action.GetActionType() == "remove" {
-		operation.Changes[action.(*RemovePackageAction).BpmPackage.PkgInfo.Name] = "remove"
-	}
-}
-
-func (operation *BPMOperation) RemoveAction(pkg, actionType string) {
-	operation.Actions = slices.DeleteFunc(operation.Actions, func(a OperationAction) bool {
-		if a.GetActionType() != actionType {
-			return false
-		}
-		if a.GetActionType() == "install" {
-			return a.(*InstallPackageAction).BpmPackage.PkgInfo.Name == pkg
-		} else if a.GetActionType() == "fetch" {
-			return a.(*FetchPackageAction).DatabaseEntry.Info.Name == pkg
-		} else if a.GetActionType() == "remove" {
-			return a.(*RemovePackageAction).BpmPackage.PkgInfo.Name == pkg
-		}
-		return false
-	})
-}
-
 func (operation *BPMOperation) GetTotalDownloadSize() int64 {
 	var ret int64 = 0
 	for _, action := range operation.Actions {
@@ -129,8 +66,9 @@ func (operation *BPMOperation) GetFinalActionSize(rootDir string) int64 {
 	return ret
 }
 
-func (operation *BPMOperation) ResolveDependencies(reinstallDependencies, installOptionalDependencies, verbose bool) error {
-	pos := 0
+func (operation *BPMOperation) ResolveDependencies(installRuntimeDepends bool) {
+	// Discover resolved virtual packages
+	resolvedVirtualPackages := make(map[string]string)
 	for _, value := range slices.Clone(operation.Actions) {
 		var pkgInfo *PackageInfo
 		if value.GetActionType() == "install" {
@@ -140,58 +78,66 @@ func (operation *BPMOperation) ResolveDependencies(reinstallDependencies, instal
 			action := value.(*FetchPackageAction)
 			pkgInfo = action.DatabaseEntry.Info
 		} else {
-			pos++
 			continue
 		}
 
-		resolved, unresolved := ResolveAllPackageDependenciesFromDatabases(pkgInfo, pkgInfo.Type == "source", installOptionalDependencies, !reinstallDependencies, verbose, operation.RootDir)
+		for _, vpkg := range pkgInfo.Provides {
+			if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+				resolvedVirtualPackages[vpkg] = pkgInfo.Name
+			}
+		}
+	}
 
-		operation.UnresolvedDepends = append(operation.UnresolvedDepends, unresolved...)
+	// Discover all dependencies
+	newActions := make([]OperationAction, 0)
+	for _, value := range operation.Actions {
+		var pkgInfo *PackageInfo
+		var flags map[string]string
+		if value.GetActionType() == "install" {
+			action := value.(*InstallPackageAction)
+			pkgInfo = action.BpmPackage.PkgInfo
+			flags = action.Flags
+		} else if value.GetActionType() == "fetch" {
+			action := value.(*FetchPackageAction)
+			pkgInfo = action.DatabaseEntry.Info
+			flags = action.Flags
+		} else {
+			continue
+		}
+
+		resolved, unresolved := ResolveDependencies(pkgInfo, flags, resolvedVirtualPackages, installRuntimeDepends, operation.RootDir)
+
+		// Copy unresolved dependencies
+		maps.Copy(operation.UnresolvedDepends, unresolved)
 
 		for _, resolvedPkg := range resolved {
-			if !operation.ActionsContainPackage(resolvedPkg.PkgName) && resolvedPkg.PkgName != pkgInfo.Name {
-				if !reinstallDependencies && IsPackageInstalled(resolvedPkg.PkgName, operation.RootDir) {
-					continue
-				}
-				entry, _, err := GetDatabaseEntry(resolvedPkg.PkgName)
-				if err != nil {
-					return errors.New("could not get database entry for package (" + resolvedPkg.PkgName + ")")
-				}
-				operation.InsertActionAt(pos, &FetchPackageAction{
+			if ActionSliceIndex(newActions, resolvedPkg.DatabaseEntry.Info.Name) == -1 { // Dependency not in actions slice
+				var action OperationAction = &FetchPackageAction{
 					InstallationReason: resolvedPkg.InstallationReason,
-					DatabaseEntry:      entry,
-				})
-				pos++
+					Flags:              resolvedPkg.Flags,
+					DatabaseEntry:      resolvedPkg.DatabaseEntry,
+				}
+				newActions = append(newActions, action)
+
+				for _, vpkg := range resolvedPkg.DatabaseEntry.Info.Provides {
+					if _, ok := resolvedVirtualPackages[vpkg]; !ok {
+						resolvedVirtualPackages[vpkg] = resolvedPkg.DatabaseEntry.Info.Name
+					}
+				}
+
+				// Check if can move original action
+				if i := ActionSliceIndex(operation.Actions, resolvedPkg.DatabaseEntry.Info.Name); i != -1 {
+					newActions[len(newActions)-1] = operation.Actions[i]
+				}
 			}
 		}
-		pos++
-	}
 
-	return nil
-}
-
-func (operation *BPMOperation) RemoveNeededPackages() error {
-	removeActions := make(map[string]*RemovePackageAction)
-	for _, action := range slices.Clone(operation.Actions) {
-		if action.GetActionType() == "remove" {
-			removeActions[action.(*RemovePackageAction).BpmPackage.PkgInfo.Name] = action.(*RemovePackageAction)
+		if ActionSliceIndex(newActions, pkgInfo.Name) == -1 {
+			newActions = append(newActions, value)
 		}
 	}
 
-	for pkg, action := range removeActions {
-		dependants := action.BpmPackage.PkgInfo.GetPackageDependants(operation.RootDir)
-		dependants = slices.DeleteFunc(dependants, func(d string) bool {
-			if _, ok := removeActions[d]; ok {
-				return true
-			}
-			return false
-		})
-		if len(dependants) != 0 {
-			operation.RemoveAction(pkg, action.GetActionType())
-		}
-	}
-
-	return nil
+	operation.Actions = newActions
 }
 
 func (operation *BPMOperation) Cleanup(cleanupMakeDepends bool) error {
@@ -202,11 +148,11 @@ func (operation *BPMOperation) Cleanup(cleanupMakeDepends bool) error {
 	}
 	installedPackages := make([]*PackageInfo, len(installedPackageNames))
 	for i, value := range installedPackageNames {
-		bpmpkg := GetPackage(value, operation.RootDir)
-		if bpmpkg == nil {
+		pkgInfo := GetPackageInfo(value, operation.RootDir)
+		if pkgInfo == nil {
 			return errors.New("could not find installed package (" + value + ")")
 		}
-		installedPackages[i] = bpmpkg.PkgInfo
+		installedPackages[i] = pkgInfo
 	}
 
 	// Get packages to remove
@@ -217,37 +163,76 @@ func (operation *BPMOperation) Cleanup(cleanupMakeDepends bool) error {
 		}
 	}
 
-	// Get manually installed packages, resolve all their dependencies and add them to the keepPackages slice
-	keepPackages := make([]string, 0)
-	for _, pkg := range slices.Clone(installedPackages) {
-		if GetInstallationReason(pkg.Name, operation.RootDir) != InstallationReasonManual {
+	// Run BFS on all manually installed packages
+	visited := make([]string, 0)
+	for _, pkg := range installedPackages {
+		if getPackageLocalInfo(pkg.Name, operation.RootDir).GetInstallationReason() != InstallationReasonManual {
 			continue
 		}
 
-		// Do not resolve dependencies or add package to keepPackages slice if package removal action exists for it
-		if _, ok := removeActions[pkg.Name]; ok {
-			continue
-		}
+		queue := make([]*PackageInfo, 0)
 
-		keepPackages = append(keepPackages, pkg.Name)
-		resolved := pkg.GetDependenciesRecursive(!cleanupMakeDepends, operation.RootDir)
-		for _, value := range resolved {
-			if !slices.Contains(keepPackages, value) && !slices.Contains(MainBPMConfig.IgnorePackages, value) {
-				keepPackages = append(keepPackages, value)
+		queue = append(queue, pkg)
+
+		for len(queue) > 0 {
+			v := queue[len(queue)-1]
+			queue = queue[:len(queue)-1]
+
+			// Skip package if it's to be removed
+			if _, ok := removeActions[v.Name]; ok {
+				continue
+			}
+
+			// Mark package as visited
+			visited = append(visited, v.Name)
+
+			// Get all package dependencies
+			depends := v.Depends
+			depends = append(depends, v.RuntimeDepends...)
+			if cleanupMakeDepends && v.Type == "source" {
+				depends = append(depends, v.MakeDepends...)
+				depends = append(depends, v.CheckDepends...)
+			}
+
+			// Loop through all dependencies
+			for _, depend := range depends {
+				// Deconstruct package string
+				d, err := DeconstructPackageString(depend)
+				if err != nil {
+					return fmt.Errorf("could not deconstruct package string: %s", err)
+				}
+
+				// Resolve dependency
+				var dependPkgInfo *PackageInfo
+				if providers := GetVirtualPackageInfo(d.PkgName, operation.RootDir); len(providers) > 0 {
+					dependPkgInfo = providers[0]
+				} else {
+					dependPkgInfo = GetPackageInfo(d.PkgName, operation.RootDir)
+				}
+				if dependPkgInfo == nil {
+					continue
+				}
+
+				// Mark dependency as visited and add it to the queue
+				if !slices.Contains(visited, dependPkgInfo.Name) {
+					visited = append(visited, dependPkgInfo.Name)
+					queue = append(queue, dependPkgInfo)
+				}
 			}
 		}
 	}
 
-	// Get all installed packages that are not in the keepPackages slice and add them to the BPM operation
+	// Remove all packages that were not discovered after running BFS
 	for _, pkg := range installedPackageNames {
 		// Do not add package removal action if there already is one
 		if _, ok := removeActions[pkg]; ok {
 			continue
 		}
-		if !slices.Contains(keepPackages, pkg) {
+
+		if !slices.Contains(visited, pkg) {
 			bpmpkg := GetPackage(pkg, operation.RootDir)
 			if bpmpkg == nil {
-				return errors.New("Error: could not find installed package (" + pkg + ")")
+				return fmt.Errorf("could not find installed package (%s)", pkg)
 			}
 			operation.Actions = append(operation.Actions, &RemovePackageAction{BpmPackage: bpmpkg})
 		}
@@ -271,10 +256,11 @@ func (operation *BPMOperation) ReplaceObsoletePackages() {
 		}
 
 		for _, r := range pkgInfo.Replaces {
-			if bpmpkg := GetPackage(r, operation.RootDir); bpmpkg != nil && !operation.ActionsContainPackage(bpmpkg.PkgInfo.Name) {
-				operation.InsertActionAt(0, &RemovePackageAction{
+			if bpmpkg := GetPackage(r, operation.RootDir); bpmpkg != nil && ActionSliceIndex(operation.Actions, bpmpkg.PkgInfo.Name) == -1 {
+				var action OperationAction = &RemovePackageAction{
 					BpmPackage: bpmpkg,
-				})
+				}
+				operation.Actions = slices.Insert(operation.Actions, 0, action)
 			}
 		}
 	}
@@ -379,15 +365,30 @@ func (operation *BPMOperation) ShowOperationSummary() {
 
 	for _, value := range operation.Actions {
 		var pkgInfo *PackageInfo
+		var flagsStr string
 		var installationReason = InstallationReasonUnknown
 		if value.GetActionType() == "install" {
 			installationReason = value.(*InstallPackageAction).InstallationReason
 			pkgInfo = value.(*InstallPackageAction).BpmPackage.PkgInfo
+			if len(value.(*InstallPackageAction).Flags) > 0 {
+				flagsSlice := make([]string, 0)
+				for flag, value := range value.(*InstallPackageAction).Flags {
+					flagsSlice = append(flagsSlice, flag+"="+value)
+				}
+				flagsStr = "[" + strings.Join(flagsSlice, ",") + "]"
+			}
 			if value.(*InstallPackageAction).SplitPackageToInstall != "" {
 				pkgInfo = pkgInfo.GetSplitPackageInfo(value.(*InstallPackageAction).SplitPackageToInstall)
 			}
 		} else if value.GetActionType() == "fetch" {
 			installationReason = value.(*FetchPackageAction).InstallationReason
+			if len(value.(*FetchPackageAction).Flags) > 0 {
+				flagsSlice := make([]string, 0)
+				for flag, value := range value.(*FetchPackageAction).Flags {
+					flagsSlice = append(flagsSlice, flag+"="+value)
+				}
+				flagsStr = "[" + strings.Join(flagsSlice, ",") + "]"
+			}
 			pkgInfo = value.(*FetchPackageAction).DatabaseEntry.Info
 		} else {
 			pkgInfo = value.(*RemovePackageAction).BpmPackage.PkgInfo
@@ -409,15 +410,15 @@ func (operation *BPMOperation) ShowOperationSummary() {
 
 		installedInfo := GetPackageInfo(pkgInfo.Name, operation.RootDir)
 		if installedInfo == nil {
-			fmt.Fprintf(writer, "%s\t%s\t%s\t%s\t%t\n", pkgInfo.Name, pkgInfo.GetFullVersion(), "Install", installationReasonStr, pkgInfo.Type == "source")
+			fmt.Fprintf(writer, "%s\t%s\t%s\t%s\t%t\n", pkgInfo.Name+flagsStr, pkgInfo.GetFullVersion(), "Install", installationReasonStr, pkgInfo.Type == "source")
 		} else {
 			comparison := CompareVersions(pkgInfo.GetFullVersion(), installedInfo.GetFullVersion())
 			if comparison < 0 {
-				fmt.Fprintf(writer, "%s\t%s -> %s\t%s\t%s\t%t\n", pkgInfo.Name, installedInfo.GetFullVersion(), pkgInfo.GetFullVersion(), "Downgrade", installationReasonStr, pkgInfo.Type == "source")
+				fmt.Fprintf(writer, "%s\t%s -> %s\t%s\t%s\t%t\n", pkgInfo.Name+flagsStr, installedInfo.GetFullVersion(), pkgInfo.GetFullVersion(), "Downgrade", installationReasonStr, pkgInfo.Type == "source")
 			} else if comparison > 0 {
-				fmt.Fprintf(writer, "%s\t%s -> %s\t%s\t%s\t%t\n", pkgInfo.Name, installedInfo.GetFullVersion(), pkgInfo.GetFullVersion(), "Upgrade", installationReasonStr, pkgInfo.Type == "source")
+				fmt.Fprintf(writer, "%s\t%s -> %s\t%s\t%s\t%t\n", pkgInfo.Name+flagsStr, installedInfo.GetFullVersion(), pkgInfo.GetFullVersion(), "Upgrade", installationReasonStr, pkgInfo.Type == "source")
 			} else {
-				fmt.Fprintf(writer, "%s\t%s\t%s\t%s\t%t\n", pkgInfo.Name, pkgInfo.GetFullVersion(), "Reinstall", installationReasonStr, pkgInfo.Type == "source")
+				fmt.Fprintf(writer, "%s\t%s\t%s\t%s\t%t\n", pkgInfo.Name+flagsStr, pkgInfo.GetFullVersion(), "Reinstall", installationReasonStr, pkgInfo.Type == "source")
 			}
 		}
 	}
@@ -470,7 +471,7 @@ func (operation *BPMOperation) GetOptionalDependencies() (optionalDepends map[st
 	optionalDepends = make(map[string][]string)
 
 	// Find all optional dependencies
-	for _, value := range slices.Clone(operation.Actions) {
+	for _, value := range operation.Actions {
 		var pkgInfo *PackageInfo
 		if value.GetActionType() == "install" {
 			action := value.(*InstallPackageAction)
@@ -483,24 +484,66 @@ func (operation *BPMOperation) GetOptionalDependencies() (optionalDepends map[st
 		}
 
 		for _, depend := range pkgInfo.OptionalDepends {
+			// Deconstruct package string
+			d, err := DeconstructPackageString(depend)
+			if err != nil {
+				continue
+			}
+
 			// Skip if dependency is already installed
-			if IsPackageInstalled(depend, operation.RootDir) {
+			if IsPackageInstalled(d.PkgName, operation.RootDir) || len(GetVirtualPackageInfo(d.PkgName, operation.RootDir)) > 0 {
+				continue
+			}
+
+			// Skip if dependency is going to be installed
+			if slices.IndexFunc(operation.Actions, func(action OperationAction) bool {
+				var pkgInfo *PackageInfo
+				if action.GetActionType() == "install" {
+					action := action.(*InstallPackageAction)
+					pkgInfo = action.BpmPackage.PkgInfo
+				} else if action.GetActionType() == "fetch" {
+					action := action.(*FetchPackageAction)
+					pkgInfo = action.DatabaseEntry.Info
+				} else {
+					return false
+				}
+
+				if pkgInfo.Name == d.PkgName {
+					return true
+				} else if slices.Contains(pkgInfo.Provides, d.PkgName) {
+					return true
+				}
+
+				return false
+			}) != -1 {
 				continue
 			}
 
 			// Skip if not a new dependency of the package
-			if installedPkg := GetPackage(pkgInfo.Name, operation.RootDir); installedPkg != nil && slices.Contains(installedPkg.PkgInfo.OptionalDepends, depend) {
+			if installedPkg := GetPackage(pkgInfo.Name, operation.RootDir); installedPkg != nil && slices.ContainsFunc(installedPkg.PkgInfo.OptionalDepends, func(n string) bool {
+				// Deconstruct package string
+				d2, err := DeconstructPackageString(depend)
+				if err != nil {
+					return false
+				}
+
+				return d2.PkgName == d.PkgName
+			}) {
 				continue
 			}
 
-			optionalDepends[pkgInfo.Name] = append(optionalDepends[pkgInfo.Name], depend)
+			if d.Description != "" {
+				optionalDepends[pkgInfo.Name] = append(optionalDepends[pkgInfo.Name], fmt.Sprintf("%s (%s)", d.PkgName, d.Description))
+			} else {
+				optionalDepends[pkgInfo.Name] = append(optionalDepends[pkgInfo.Name], d.PkgName)
+			}
 		}
 	}
 
 	return
 }
 
-func (operation *BPMOperation) RunHooks(verbose bool) error {
+func (operation *BPMOperation) RunPreHooks(verbose bool) error {
 	// Return if hooks directory does not exist
 	if stat, err := os.Stat(path.Join(operation.RootDir, "var/lib/bpm/hooks")); err != nil || !stat.IsDir() {
 		return nil
@@ -520,7 +563,46 @@ func (operation *BPMOperation) RunHooks(verbose bool) error {
 				log.Printf("Error while reading hook (%s): %s", entry.Name(), err)
 			}
 
-			err = hook.Execute(operation.Changes, verbose, operation.RootDir)
+			if !hook.TriggerPreOperation {
+				continue
+			}
+
+			err = hook.Execute(operation.ModifiedFiles, false, verbose, operation.RootDir)
+			if err != nil {
+				log.Printf("Warning: could not execute hook (%s): %s\n", entry.Name(), err)
+				continue
+			}
+		}
+	}
+
+	return nil
+}
+
+func (operation *BPMOperation) RunPostHooks(verbose bool) error {
+	// Return if hooks directory does not exist
+	if stat, err := os.Stat(path.Join(operation.RootDir, "var/lib/bpm/hooks")); err != nil || !stat.IsDir() {
+		return nil
+	}
+
+	// Get directory entries in hooks directory
+	dirEntries, err := os.ReadDir(path.Join(operation.RootDir, "var/lib/bpm/hooks"))
+	if err != nil {
+		return err
+	}
+
+	// Find all hooks, validate and execute them
+	for _, entry := range dirEntries {
+		if entry.Type().IsRegular() && strings.HasSuffix(entry.Name(), ".bpmhook") {
+			hook, err := createHook(path.Join(operation.RootDir, "var/lib/bpm/hooks", entry.Name()))
+			if err != nil {
+				log.Printf("Error while reading hook (%s): %s", entry.Name(), err)
+			}
+
+			if hook.TriggerPreOperation {
+				continue
+			}
+
+			err = hook.Execute(operation.ModifiedFiles, false, verbose, operation.RootDir)
 			if err != nil {
 				log.Printf("Warning: could not execute hook (%s): %s\n", entry.Name(), err)
 				continue
@@ -590,6 +672,7 @@ func (operation *BPMOperation) FetchPackages() (err error) {
 				operation.Actions[i] = &InstallPackageAction{
 					File:                  fetchedPackages[entry.Filepath],
 					InstallationReason:    action.(*FetchPackageAction).InstallationReason,
+					Flags:                 action.(*FetchPackageAction).Flags,
 					BpmPackage:            bpmpkg,
 					SplitPackageToInstall: entry.Info.Name,
 				}
@@ -597,6 +680,7 @@ func (operation *BPMOperation) FetchPackages() (err error) {
 				operation.Actions[i] = &InstallPackageAction{
 					File:               fetchedPackages[entry.Filepath],
 					InstallationReason: action.(*FetchPackageAction).InstallationReason,
+					Flags:              action.(*FetchPackageAction).Flags,
 					BpmPackage:         bpmpkg,
 				}
 			}
@@ -604,9 +688,40 @@ func (operation *BPMOperation) FetchPackages() (err error) {
 	}
 
 	operation.hasFetchedPackages = true
+
 	return nil
 }
 
+func (operation *BPMOperation) GetModifiedFiles() {
+	// Get modified files
+	for _, action := range operation.Actions {
+		if action.GetActionType() == "install" {
+			installAction := action.(*InstallPackageAction)
+			isUpgrade := IsPackageInstalled(installAction.BpmPackage.PkgInfo.Name, operation.RootDir)
+
+			if isUpgrade {
+				for _, pkgFile := range installAction.BpmPackage.PkgFiles {
+					operation.ModifiedFiles[pkgFile.Path] = "upgrade"
+				}
+				for _, pkgFile := range GetPackage(installAction.BpmPackage.PkgInfo.Name, operation.RootDir).PkgFiles {
+					operation.ModifiedFiles[pkgFile.Path] = "upgrade"
+				}
+			} else {
+				for _, pkgFile := range installAction.BpmPackage.PkgFiles {
+					operation.ModifiedFiles[pkgFile.Path] = "install"
+				}
+			}
+		}
+		if action.GetActionType() == "remove" {
+			removeAction := action.(*RemovePackageAction)
+
+			for _, pkgFile := range removeAction.BpmPackage.PkgFiles {
+				operation.ModifiedFiles[pkgFile.Path] = "remove"
+			}
+		}
+	}
+}
+
 func (operation *BPMOperation) Execute(verbose, force bool) (err error) {
 	// Fetch packages
 	if !operation.hasFetchedPackages {
@@ -646,6 +761,7 @@ func (operation *BPMOperation) Execute(verbose, force bool) (err error) {
 		} else if action.GetActionType() == "install" {
 			value := action.(*InstallPackageAction)
 			fileToInstall := value.File
+			compilationFlags := value.Flags
 			bpmpkg := value.BpmPackage
 			var err error
 
@@ -670,7 +786,7 @@ func (operation *BPMOperation) Execute(verbose, force bool) (err error) {
 
 				// Compile source package if not compiled already
 				if _, ok := operation.compiledPackages[pkgNameToInstall]; !ok {
-					outputBpmPackages, err := CompileSourcePackage(value.File, compiledDir, false, false, verbose)
+					outputBpmPackages, err := CompileSourcePackage(value.File, compiledDir, compilationFlags, operation.CompilationJobs, !operation.RunChecks, false, verbose)
 					if err != nil {
 						return fmt.Errorf("could not compile source package (%s): %s\n", value.File, err)
 					}
@@ -690,22 +806,15 @@ func (operation *BPMOperation) Execute(verbose, force bool) (err error) {
 			}
 
 			if value.InstallationReason != InstallationReasonManual {
-				err = installPackage(fileToInstall, operation.RootDir, verbose, true)
+				err = installPackage(fileToInstall, value.InstallationReason, value.Flags, operation.RootDir, verbose, true)
 			} else {
-				err = installPackage(fileToInstall, operation.RootDir, verbose, force)
+				err = installPackage(fileToInstall, value.InstallationReason, value.Flags, operation.RootDir, verbose, force)
 			}
 			if err != nil {
 				return fmt.Errorf("could not install package (%s): %s\n", bpmpkg.PkgInfo.Name, err)
 			}
-
-			// Set installed package's installation reason
-			err = SetInstallationReason(bpmpkg.PkgInfo.Name, value.InstallationReason, operation.RootDir)
-			if err != nil {
-				return fmt.Errorf("could not set installation reason for package (%s): %s\n", value.BpmPackage.PkgInfo.Name, err)
-			}
 		}
 	}
-	fmt.Println("Operation complete!")
 
 	return nil
 }
@@ -717,6 +826,7 @@ type OperationAction interface {
 type InstallPackageAction struct {
 	File                  string
 	InstallationReason    InstallationReason
+	Flags                 map[string]string
 	SplitPackageToInstall string
 	BpmPackage            *BPMPackage
 }
@@ -727,6 +837,7 @@ func (action *InstallPackageAction) GetActionType() string {
 
 type FetchPackageAction struct {
 	InstallationReason InstallationReason
+	Flags              map[string]string
 	DatabaseEntry      *BPMDatabaseEntry
 }
 
@@ -741,3 +852,41 @@ type RemovePackageAction struct {
 func (action *RemovePackageAction) GetActionType() string {
 	return "remove"
 }
+
+func ActionSliceIndex(actions []OperationAction, pkg string) int {
+	for i, action := range actions {
+		if action.GetActionType() == "install" {
+			if action.(*InstallPackageAction).BpmPackage.PkgInfo.Name == pkg {
+				return i
+			}
+		} else if action.GetActionType() == "fetch" {
+			if action.(*FetchPackageAction).DatabaseEntry.Info.Name == pkg {
+				return i
+			}
+		} else if action.GetActionType() == "remove" {
+			if action.(*RemovePackageAction).BpmPackage.PkgInfo.Name == pkg {
+				return i
+			}
+		}
+	}
+
+	return -1
+}
+
+func ActionSliceRemove(actions []OperationAction, pkg, actionType string) []OperationAction {
+	actions = slices.DeleteFunc(actions, func(a OperationAction) bool {
+		if a.GetActionType() != actionType {
+			return false
+		}
+		if a.GetActionType() == "install" {
+			return a.(*InstallPackageAction).BpmPackage.PkgInfo.Name == pkg
+		} else if a.GetActionType() == "fetch" {
+			return a.(*FetchPackageAction).DatabaseEntry.Info.Name == pkg
+		} else if a.GetActionType() == "remove" {
+			return a.(*RemovePackageAction).BpmPackage.PkgInfo.Name == pkg
+		}
+		return false
+	})
+
+	return actions
+}

src/bpmlib/packages.go

@@ -10,19 +10,22 @@ import (
 	"os"
 	"os/exec"
 	"path"
+	"path/filepath"
 	"regexp"
 	"slices"
 	"sort"
 	"strconv"
 	"strings"
 	"syscall"
+	"time"
 
 	"gopkg.in/yaml.v3"
 )
 
 type BPMPackage struct {
-	PkgInfo  *PackageInfo
-	PkgFiles []*PackageFileEntry
+	PkgInfo   *PackageInfo
+	PkgFiles  []*PackageFileEntry
+	LocalInfo PackageLocalInfo
 }
 
 type PackageInfo struct {
@@ -32,21 +35,41 @@ type PackageInfo struct {
 	Revision        int               `yaml:"revision,omitempty"`
 	Url             string            `yaml:"url,omitempty"`
 	License         string            `yaml:"license,omitempty"`
+	Maintainers     []string          `yaml:"maintainers,omitempty"`
 	Arch            string            `yaml:"architecture,omitempty"`
 	OutputArch      string            `yaml:"output_architecture,omitempty"`
 	Type            string            `yaml:"type,omitempty"`
 	Keep            []string          `yaml:"keep,omitempty"`
 	Depends         []string          `yaml:"depends,omitempty"`
+	RuntimeDepends  []string          `yaml:"runtime_depends,omitempty"`
 	OptionalDepends []string          `yaml:"optional_depends,omitempty"`
 	MakeDepends     []string          `yaml:"make_depends,omitempty"`
+	CheckDepends    []string          `yaml:"check_depends,omitempty"`
 	Conflicts       []string          `yaml:"conflicts,omitempty"`
 	Replaces        []string          `yaml:"replaces,omitempty"`
 	Provides        []string          `yaml:"provides,omitempty"`
 	Options         []string          `yaml:"options,omitempty"`
+	Flags           []PackageFlag     `yaml:"flags,omitempty"`
 	Downloads       []PackageDownload `yaml:"downloads,omitempty"`
 	SplitPackages   []*PackageInfo    `yaml:"split_packages,omitempty"`
 }
 
+type PackageFlag struct {
+	Name           string                 `yaml:"name"`
+	DefaultValue   string                 `yaml:"default_value"`
+	BuiltValue     string                 `yaml:"built_value"`
+	AcceptedValues []PackageAcceptedValue `yaml:"accepted_values,omitempty"`
+}
+
+type PackageAcceptedValue struct {
+	Value           string   `yaml:"value"`
+	Depends         []string `yaml:"depends,omitempty"`
+	RuntimeDepends  []string `yaml:"runtime_depends,omitempty"`
+	OptionalDepends []string `yaml:"optional_depends,omitempty"`
+	MakeDepends     []string `yaml:"make_depends,omitempty"`
+	CheckDepends    []string `yaml:"check_depends,omitempty"`
+}
+
 type PackageDownload struct {
 	Url      string `yaml:"url"`
 	Type     string `yaml:"type,omitempty"`
@@ -72,6 +95,13 @@ type PackageFileEntry struct {
 	SizeInBytes int64
 }
 
+type PackageLocalInfo struct {
+	InstallationReason string            `yaml:"installation_reason"`
+	Flags              map[string]string `yaml:"flags"`
+	InstalledOn        int64             `yaml:"installed_on"`
+	LastUpdatedOn      int64             `yaml:"last_updated_on"`
+}
+
 func (pkg *BPMPackage) GetInstalledSize() int64 {
 	var totalSize int64 = 0
 	for _, entry := range pkg.PkgFiles {
@@ -120,35 +150,17 @@ const (
 	InstallationReasonUnknown        InstallationReason = "unknown"
 )
 
-func GetInstallationReason(pkg, rootDir string) InstallationReason {
-	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
-	pkgDir := path.Join(installedDir, pkg)
-	if stat, err := os.Stat(path.Join(pkgDir, "installation_reason")); err != nil || stat.IsDir() {
+func (localInfo PackageLocalInfo) GetInstallationReason() InstallationReason {
+	switch localInfo.InstallationReason {
+	case "manual":
 		return InstallationReasonManual
-	}
-	b, err := os.ReadFile(path.Join(pkgDir, "installation_reason"))
-	if err != nil {
+	case "dependency":
+		return InstallationReasonDependency
+	case "make_dependency":
+		return InstallationReasonMakeDependency
+	default:
 		return InstallationReasonUnknown
 	}
-	reason := strings.TrimSpace(string(b))
-	if reason == "manual" {
-		return InstallationReasonManual
-	} else if reason == "dependency" {
-		return InstallationReasonDependency
-	} else if reason == "make_dependency" {
-		return InstallationReasonMakeDependency
-	}
-	return InstallationReasonUnknown
-}
-
-func SetInstallationReason(pkg string, reason InstallationReason, rootDir string) error {
-	installedDir := path.Join(rootDir, "var/lib/bpm/installed/")
-	pkgDir := path.Join(installedDir, pkg)
-	err := os.WriteFile(path.Join(pkgDir, "installation_reason"), []byte(reason), 0644)
-	if err != nil {
-		return err
-	}
-	return nil
 }
 
 func GetPackageInfoRaw(filename string) (string, error) {
@@ -169,7 +181,7 @@ func GetPackageInfoRaw(filename string) (string, error) {
 		if err != nil {
 			return "", err
 		}
-		if header.Name == "pkg.info" {
+		if header.Name == "info.yml" {
 			bs, _ := io.ReadAll(tr)
 			err := file.Close()
 			if err != nil {
@@ -178,7 +190,7 @@ func GetPackageInfoRaw(filename string) (string, error) {
 			return string(bs), nil
 		}
 	}
-	return "", errors.New("pkg.info not found in archive")
+	return "", errors.New("info.yml not found in archive")
 }
 
 func ReadPackage(filename string) (*BPMPackage, error) {
@@ -204,13 +216,13 @@ func ReadPackage(filename string) (*BPMPackage, error) {
 		if err != nil {
 			return nil, err
 		}
-		if header.Name == "pkg.info" {
+		if header.Name == "info.yml" {
 			bs, _ := io.ReadAll(tr)
 			pkgInfo, err = ReadPackageInfo(string(bs))
 			if err != nil {
 				return nil, err
 			}
-		} else if header.Name == "pkg.files" {
+		} else if header.Name == "files.txt" {
 			bs, _ := io.ReadAll(tr)
 			for _, line := range strings.Split(string(bs), "\n") {
 				if strings.TrimSpace(line) == "" {
@@ -218,7 +230,7 @@ func ReadPackage(filename string) (*BPMPackage, error) {
 				}
 				stringEntry := strings.Split(strings.TrimSpace(line), " ")
 				if len(stringEntry) < 5 {
-					return nil, errors.New("pkg.files is not formatted correctly")
+					return nil, errors.New("files.txt is not formatted correctly")
 				}
 				octalPerms, err := strconv.ParseUint(stringEntry[len(stringEntry)-4], 8, 32)
 				if err != nil {
@@ -248,7 +260,7 @@ func ReadPackage(filename string) (*BPMPackage, error) {
 	}
 
 	if pkgInfo == nil {
-		return nil, errors.New("pkg.info not found in archive")
+		return nil, errors.New("info.yml not found in archive")
 	}
 	return &BPMPackage{
 		PkgInfo:  pkgInfo,
@@ -457,6 +469,7 @@ func ReadPackageInfo(contents string) (*PackageInfo, error) {
 		OutputArch:      GetArch(),
 		Keep:            make([]string, 0),
 		Depends:         make([]string, 0),
+		RuntimeDepends:  make([]string, 0),
 		MakeDepends:     make([]string, 0),
 		OptionalDepends: make([]string, 0),
 		Conflicts:       make([]string, 0),
@@ -537,56 +550,186 @@ func ReadPackageInfo(contents string) (*PackageInfo, error) {
 }
 
 func (pkgInfo *PackageInfo) CreateReadableInfo(rootDir string) string {
-	ret := make([]string, 0)
-	appendArray := func(label string, array []string) {
+	builder := strings.Builder{}
+	builderWriteStringNotEmpty := func(label string, value string) {
+		if value != "" {
+			builder.WriteString(label + ": " + value + "\n")
+		}
+	}
+	builderWriteArray := func(label string, array []string, sort bool) {
 		if len(array) == 0 {
 			return
 		}
 
-		ret = append(ret, fmt.Sprintf("%s: %s", label, strings.Join(array, ", ")))
+		// Sort array
+		if sort {
+			slices.Sort(array)
+		}
+
+		builder.WriteString(label + " (" + strconv.Itoa(len(array)) + "):\n")
+		for _, val := range array {
+			builder.WriteString("  - " + val + "\n")
+		}
+	}
+	builderWriteDependencyArray := func(label string, depends []string) {
+		if len(depends) == 0 {
+			return
+		}
+
+		// Sort array
+		slices.Sort(depends)
+
+		builder.WriteString(label + " (" + strconv.Itoa(len(depends)) + "):\n")
+		for _, val := range depends {
+			builder.WriteString("  - " + val)
+
+			// Show virtual package providers
+			if providers := GetVirtualPackageInfo(val, rootDir); len(providers) > 0 {
+				builder.WriteString(" (")
+				for i, vpkg := range providers {
+					if i == len(providers)-1 {
+						builder.WriteString(vpkg.Name)
+					} else {
+						builder.WriteString(vpkg.Name + ", ")
+					}
+				}
+				builder.WriteString(")")
+			}
+
+			builder.WriteString("\n")
+		}
 	}
 
-	ret = append(ret, "Name: "+pkgInfo.Name)
-	ret = append(ret, "Description: "+pkgInfo.Description)
-	ret = append(ret, "Version: "+pkgInfo.GetFullVersion())
-	if pkgInfo.Url != "" {
-		ret = append(ret, "URL: "+pkgInfo.Url)
-	}
-	if pkgInfo.License != "" {
-		ret = append(ret, "License: "+pkgInfo.License)
-	}
-	ret = append(ret, "Architecture: "+pkgInfo.Arch)
+	// Main information
+	builder.WriteString("Name: " + pkgInfo.Name + "\n")
+	builder.WriteString("Description: " + pkgInfo.Description + "\n")
+	builder.WriteString("Version: " + pkgInfo.GetFullVersion() + "\n")
+	builderWriteStringNotEmpty("URL", pkgInfo.Url)
+	builderWriteStringNotEmpty("License", pkgInfo.License)
+	builderWriteArray("Maintainers", pkgInfo.Maintainers, false)
+	builder.WriteString("Architecture: " + pkgInfo.Arch + "\n")
 	if pkgInfo.Type == "source" && pkgInfo.OutputArch != "" && pkgInfo.OutputArch != GetArch() {
-		ret = append(ret, "Output architecture: "+pkgInfo.Arch)
+		builder.WriteString("Output architecture: " + pkgInfo.OutputArch + "\n")
 	}
-	ret = append(ret, "Type: "+pkgInfo.Type)
-	appendArray("Dependencies", pkgInfo.Depends)
-	if pkgInfo.Type == "source" {
-		appendArray("Make Dependencies", pkgInfo.MakeDepends)
-	}
-	appendArray("Optional dependencies", pkgInfo.OptionalDepends)
-	dependants := pkgInfo.GetPackageDependants(rootDir)
-	if len(dependants) > 0 {
-		appendArray("Dependant packages", dependants)
-	}
-	optionalDependants := pkgInfo.GetPackageOptionalDependants(rootDir)
-	if len(optionalDependants) > 0 {
-		appendArray("Optionally dependant packages", optionalDependants)
-	}
-	appendArray("Conflicting packages", pkgInfo.Conflicts)
-	appendArray("Provided packages", pkgInfo.Provides)
-	appendArray("Replaces packages", pkgInfo.Replaces)
+	builder.WriteString("Type: " + pkgInfo.Type + "\n")
 
+	// Flags
+	if pkgInfo.Type == "binary" {
+		var flags []string
+		for _, flag := range pkgInfo.Flags {
+			if pkgInfo != GetPackageInfo(pkgInfo.Name, rootDir) {
+				flags = append(flags, fmt.Sprintf("%s=%s", flag.Name, flag.BuiltValue))
+			} else if _, ok := getPackageLocalInfo(pkgInfo.Name, rootDir).Flags[flag.Name]; ok {
+				flags = append(flags, fmt.Sprintf("%s=%s (User defined)", flag.Name, flag.BuiltValue))
+			} else {
+				flags = append(flags, fmt.Sprintf("%s=%s (Default value)", flag.Name, flag.BuiltValue))
+			}
+		}
+		builderWriteArray("Built with flags:", flags, false)
+	} else {
+		if len(pkgInfo.Flags) > 0 {
+			builder.WriteString("Available flags (")
+			builder.WriteString(strconv.Itoa(len(pkgInfo.Flags)))
+			builder.WriteString("):\n")
+			for _, flag := range pkgInfo.Flags {
+				builder.WriteString("  - Flag: ")
+				builder.WriteString(flag.Name)
+				builder.WriteRune('\n')
+				if flag.DefaultValue != "" {
+					builder.WriteString("    Default value: ")
+					builder.WriteString(flag.DefaultValue)
+					builder.WriteRune('\n')
+				}
+				if len(flag.AcceptedValues) > 0 {
+					builder.WriteString("    Accepted values (")
+					builder.WriteString(strconv.Itoa(len(flag.AcceptedValues)))
+					builder.WriteString("):\n")
+
+					for i, acceptedValue := range flag.AcceptedValues {
+						writeValueDepends := func(text string, depends []string) {
+							if len(depends) > 0 {
+								builder.WriteString("        ")
+								builder.WriteString(text)
+								builder.WriteString(" (")
+								builder.WriteString(strconv.Itoa(len(depends)))
+								builder.WriteString("): ")
+								for _, depend := range depends {
+									if i != 0 {
+										builder.WriteString(", ")
+									}
+									builder.WriteString(depend)
+								}
+								builder.WriteRune('\n')
+							}
+						}
+
+						builder.WriteString("      - Value: ")
+						builder.WriteString(acceptedValue.Value)
+						builder.WriteRune('\n')
+						writeValueDepends("Dependencies", acceptedValue.Depends)
+						writeValueDepends("Make Dependencies", acceptedValue.MakeDepends)
+						writeValueDepends("Check Dependencies", acceptedValue.CheckDepends)
+						writeValueDepends("Runtime Dependencies", acceptedValue.RuntimeDepends)
+						writeValueDepends("Optional Dependencies", acceptedValue.OptionalDepends)
+					}
+				}
+			}
+		}
+	}
+
+	// Dependencies
+	builderWriteDependencyArray("Dependencies", pkgInfo.Depends)
+	if pkgInfo.Type == "source" {
+		builderWriteDependencyArray("Make dependencies", pkgInfo.MakeDepends)
+		builderWriteDependencyArray("Check dependencies", pkgInfo.CheckDepends)
+	}
+	builderWriteDependencyArray("Runtime dependencies", pkgInfo.RuntimeDepends)
+	if len(pkgInfo.OptionalDepends) > 0 {
+		builder.WriteString("Optional dependencies (" + strconv.Itoa(len(pkgInfo.OptionalDepends)) + "):\n")
+		for _, depend := range pkgInfo.OptionalDepends {
+			dependSplit := strings.SplitN(depend, ":", 2)
+			if len(dependSplit) == 2 {
+				builder.WriteString(fmt.Sprintf("  - %s (%s)", dependSplit[0], dependSplit[1]))
+			} else {
+				builder.WriteString("  - " + dependSplit[0])
+			}
+
+			// Show virtual package providers
+			if providers := GetVirtualPackageInfo(dependSplit[0], rootDir); len(providers) > 0 {
+				builder.WriteString(" (")
+				for i, vpkg := range providers {
+					if i == len(providers)-1 {
+						builder.WriteString(vpkg.Name)
+					} else {
+						builder.WriteString(vpkg.Name + ", ")
+					}
+				}
+				builder.WriteString(")")
+			}
+
+			builder.WriteString("\n")
+		}
+	}
+	builderWriteArray("Dependant packages", pkgInfo.GetPackageDependants(rootDir, false), true)
+	builderWriteArray("Optionally dependant packages", pkgInfo.GetPackageOptionalDependants(rootDir), true)
+
+	// Other package relations
+	builderWriteArray("Conflicting packages", pkgInfo.Conflicts, true)
+	builderWriteArray("Provided packages", pkgInfo.Provides, true)
+	builderWriteArray("Replaces packages", pkgInfo.Replaces, true)
+
+	// Split packages
 	if pkgInfo.Type == "source" && len(pkgInfo.SplitPackages) != 0 {
 		splitPkgs := make([]string, len(pkgInfo.SplitPackages))
 		for i, splitPkgInfo := range pkgInfo.SplitPackages {
 			splitPkgs[i] = splitPkgInfo.Name
 		}
-		appendArray("Split Packages", splitPkgs)
+		builderWriteArray("Split packages", splitPkgs, true)
 	}
 
+	// Installation reason
 	if rootDir != "" && IsPackageInstalled(pkgInfo.Name, rootDir) {
-		installationReason := GetInstallationReason(pkgInfo.Name, rootDir)
+		installationReason := GetPackage(pkgInfo.Name, rootDir).LocalInfo.GetInstallationReason()
 		var installationReasonString string
 		switch installationReason {
 		case InstallationReasonManual:
@@ -598,10 +741,10 @@ func (pkgInfo *PackageInfo) CreateReadableInfo(rootDir string) string {
 		default:
 			installationReasonString = "Unknown"
 		}
-		ret = append(ret, "Installation Reason: "+installationReasonString)
+		builder.WriteString("Installation reason: " + installationReasonString + "\n")
 	}
 
-	return strings.Join(ret, "\n")
+	return strings.TrimSpace(builder.String())
 }
 
 func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string) error {
@@ -638,6 +781,17 @@ func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string)
 		extractFilename := path.Join(rootDir, header.Name)
 		switch header.Typeflag {
 		case tar.TypeDir:
+			// Check if path is set to be ignored
+			if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+				matched, _ := filepath.Match(s, header.Name)
+				return matched
+			}); rootDir == "/" && ok {
+				if verbose {
+					fmt.Printf("Skipping Directory: %s (Path was ignored)\n", extractFilename)
+				}
+				continue
+			}
+
 			if _, err := os.Stat(extractFilename); err == nil {
 				if verbose {
 					fmt.Printf("Skipping Directory: %s (Directory already exists)\n", extractFilename)
@@ -665,6 +819,17 @@ func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string)
 			}
 			bar.Add64(header.Size)
 		case tar.TypeReg:
+			// Check if path is set to be ignored
+			if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+				matched, _ := filepath.Match(s, header.Name)
+				return matched
+			}); rootDir == "/" && ok {
+				if verbose {
+					fmt.Printf("Skipping File: %s (Path was ignored)\n", extractFilename)
+				}
+				continue
+			}
+
 			skip := false
 			if _, err := os.Stat(extractFilename); err == nil {
 				for _, k := range bpmpkg.PkgInfo.Keep {
@@ -722,6 +887,17 @@ func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string)
 			}
 			bar.Add64(header.Size)
 		case tar.TypeSymlink:
+			// Check if path is set to be ignored
+			if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+				matched, _ := filepath.Match(s, header.Name)
+				return matched
+			}); rootDir == "/" && ok {
+				if verbose {
+					fmt.Printf("Skipping Symlink: %s (Path was ignored)\n", extractFilename)
+				}
+				continue
+			}
+
 			err := os.Remove(extractFilename)
 			if err != nil && !os.IsNotExist(err) {
 				return err
@@ -737,6 +913,17 @@ func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string)
 			}
 			bar.Add64(header.Size)
 		case tar.TypeLink:
+			// Check if path is set to be ignored
+			if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+				matched, _ := filepath.Match(s, header.Name)
+				return matched
+			}); rootDir == "/" && ok {
+				if verbose {
+					fmt.Printf("Skipping Hard Link: %s (Path was ignored)\n", extractFilename)
+				}
+				continue
+			}
+
 			if verbose {
 				fmt.Println("Detected Hard Link: " + extractFilename + " -> " + path.Join(rootDir, strings.TrimPrefix(header.Linkname, "files/")))
 			}
@@ -765,7 +952,7 @@ func extractPackage(bpmpkg *BPMPackage, verbose bool, filename, rootDir string)
 	return nil
 }
 
-func installPackage(filename, rootDir string, verbose, force bool) error {
+func installPackage(filename string, installationReason InstallationReason, flags map[string]string, rootDir string, verbose, force bool) error {
 	if _, err := os.Stat(filename); os.IsNotExist(err) {
 		return err
 	}
@@ -812,26 +999,39 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 			fmt.Printf("Removing old files for package (%s)...\n", bpmpkg.PkgInfo.Name)
 		}
 		for _, entry := range fileEntries {
-			file := path.Join(rootDir, entry.Path)
-			stat, err := os.Lstat(file)
+			finalPath := path.Join(rootDir, entry.Path)
+
+			stat, err := os.Lstat(finalPath)
 			if os.IsNotExist(err) {
 				continue
-			}
-			if err != nil {
+			} else if err != nil {
 				return err
 			}
-			if len(files[entry.Path]) != 0 {
+
+			// Check if path is set to be ignored
+			if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+				matched, _ := filepath.Match(s, entry.Path)
+				return matched
+			}); rootDir == "/" && ok {
 				if verbose {
-					fmt.Println("Skipping path: " + file + " (Path is managed by multiple packages)")
+					fmt.Printf("Skipping path: %s (Path was ignored)\n", finalPath)
 				}
 				continue
 			}
+
+			if len(files[entry.Path]) != 0 {
+				if verbose {
+					fmt.Println("Skipping path: " + finalPath + " (Path is managed by multiple packages)")
+				}
+				continue
+			}
+
 			shouldContinue := false
 			for _, value := range bpmpkg.PkgInfo.Keep {
 				if strings.HasSuffix(value, "/") {
 					if strings.HasPrefix(entry.Path, value) || entry.Path == strings.TrimSuffix(value, "/") {
 						if verbose {
-							fmt.Println("Skipping path: " + file + " (Path is set to be kept during reinstalls/updates)")
+							fmt.Println("Skipping path: " + finalPath + " (Path is set to be kept during reinstalls/updates)")
 						}
 						shouldContinue = true
 						continue
@@ -839,7 +1039,7 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 				} else {
 					if entry.Path == value {
 						if verbose {
-							fmt.Println("Skipping path: " + file + " (Path is set to be kept during reinstalls/updates)")
+							fmt.Println("Skipping path: " + finalPath + " (Path is set to be kept during reinstalls/updates)")
 						}
 						shouldContinue = true
 						continue
@@ -851,37 +1051,37 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 			}
 			if stat.Mode()&os.ModeSymlink != 0 {
 				if verbose {
-					fmt.Println("Removing: " + file)
+					fmt.Println("Removing: " + finalPath)
 				}
-				err := os.Remove(file)
+				err := os.Remove(finalPath)
 				if err != nil {
 					return err
 				}
 				continue
 			}
 			if stat.IsDir() {
-				dir, err := os.ReadDir(file)
+				dir, err := os.ReadDir(finalPath)
 				if err != nil {
 					return err
 				}
 				if len(dir) != 0 {
 					if verbose {
-						fmt.Println("Skipping non-empty directory: " + file)
+						fmt.Println("Skipping non-empty directory: " + finalPath)
 					}
 					continue
 				}
 				if verbose {
-					fmt.Println("Removing: " + file)
+					fmt.Println("Removing: " + finalPath)
 				}
-				err = os.Remove(file)
+				err = os.Remove(finalPath)
 				if err != nil {
 					return err
 				}
 			} else {
 				if verbose {
-					fmt.Println("Removing: " + file)
+					fmt.Println("Removing: " + finalPath)
 				}
-				err := os.Remove(file)
+				err := os.Remove(finalPath)
 				if err != nil {
 					return err
 				}
@@ -916,12 +1116,12 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 		return err
 	}
 
-	f, err := os.Create(path.Join(pkgDir, "files"))
+	f, err := os.Create(path.Join(pkgDir, "files.txt"))
 	if err != nil {
 		return err
 	}
 
-	tarballFile, err := readTarballFile(filename, "pkg.files")
+	tarballFile, err := readTarballFile(filename, "files.txt")
 	if err != nil {
 		return err
 	}
@@ -932,7 +1132,7 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 		return err
 	}
 
-	f, err = os.Create(path.Join(pkgDir, "info"))
+	f, err = os.Create(path.Join(pkgDir, "info.yml"))
 	if err != nil {
 		return err
 	}
@@ -949,6 +1149,17 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 		return err
 	}
 
+	// Write local package information
+	localInfo := getPackageLocalInfo(bpmpkg.PkgInfo.Name, rootDir)
+	if !packageInstalled {
+		localInfo.InstalledOn = time.Now().Unix()
+	}
+	localInfo.LastUpdatedOn = time.Now().Unix()
+	localInfo.InstallationReason = string(installationReason)
+	localInfo.Flags = flags
+
+	SetPackageLocalInfo(bpmpkg.PkgInfo.Name, localInfo, rootDir)
+
 	// Save remove package scripts
 	packageScripts, err := ReadPackageScripts(filename)
 	if err != nil {
@@ -988,8 +1199,16 @@ func installPackage(filename, rootDir string, verbose, force bool) error {
 		}
 	}
 
+	// Write persistent data version number
+	if _, err := os.Stat(path.Join(rootDir, "var/lib/bpm/.version")); err != nil {
+		err = os.WriteFile(path.Join(rootDir, "var/lib/bpm/.version"), []byte(strconv.Itoa(persistentDataVersion)), 0644)
+		if err != nil {
+			return err
+		}
+	}
+
 	// Ensure local package information has been initialized for rootDir
-	err = initializeLocalPackageInformation(rootDir)
+	err = InitializeLocalPackageInformation(rootDir)
 	if err != nil {
 		return err
 	}
@@ -1033,31 +1252,44 @@ func removePackage(pkg string, verbose bool, rootDir string) error {
 	// Removing package files
 	for _, entry := range fileEntries {
 		bar.Add64(entry.SizeInBytes)
-		file := path.Join(rootDir, entry.Path)
-		lstat, err := os.Lstat(file)
+
+		finalPath := path.Join(rootDir, entry.Path)
+
+		lstat, err := os.Lstat(finalPath)
 		if os.IsNotExist(err) {
 			continue
-		}
-		if err != nil {
+		} else if err != nil {
 			return err
 		}
+
+		// Check if path is set to be ignored
+		if ok := slices.ContainsFunc(MainBPMConfig.IgnorePaths, func(s string) bool {
+			matched, _ := filepath.Match(s, entry.Path)
+			return matched
+		}); rootDir == "/" && ok {
+			if verbose {
+				fmt.Printf("Skipping path: %s (Path was ignored)\n", finalPath)
+			}
+			continue
+		}
+
 		if len(files[entry.Path]) != 0 {
 			if verbose {
-				fmt.Println("Skipping path: " + file + "(Path is managed by multiple packages)")
+				fmt.Println("Skipping path: " + finalPath + "(Path is managed by multiple packages)")
 			}
 			continue
 		}
 		if lstat.Mode()&os.ModeSymlink != 0 {
 			if verbose {
-				fmt.Println("Removing: " + file)
+				fmt.Println("Removing: " + finalPath)
 			}
-			err := os.Remove(file)
+			err := os.Remove(finalPath)
 			if err != nil {
 				return err
 			}
 			continue
 		}
-		stat, err := os.Stat(file)
+		stat, err := os.Stat(finalPath)
 		if os.IsNotExist(err) {
 			continue
 		}
@@ -1065,28 +1297,28 @@ func removePackage(pkg string, verbose bool, rootDir string) error {
 			return err
 		}
 		if stat.IsDir() {
-			dir, err := os.ReadDir(file)
+			dir, err := os.ReadDir(finalPath)
 			if err != nil {
 				return err
 			}
 			if len(dir) != 0 {
 				if verbose {
-					fmt.Println("Skipping non-empty directory: " + file)
+					fmt.Println("Skipping non-empty directory: " + finalPath)
 				}
 				continue
 			}
 			if verbose {
-				fmt.Println("Removing: " + file)
+				fmt.Println("Removing: " + finalPath)
 			}
-			err = os.Remove(file)
+			err = os.Remove(finalPath)
 			if err != nil {
 				return err
 			}
 		} else {
 			if verbose {
-				fmt.Println("Removing: " + file)
+				fmt.Println("Removing: " + finalPath)
 			}
-			err := os.Remove(file)
+			err := os.Remove(finalPath)
 			if err != nil {
 				return err
 			}
@@ -1109,7 +1341,7 @@ func removePackage(pkg string, verbose bool, rootDir string) error {
 	}
 
 	// Ensure local package information has been initialized for rootDir
-	err = initializeLocalPackageInformation(rootDir)
+	err = InitializeLocalPackageInformation(rootDir)
 	if err != nil {
 		return err
 	}

src/bpmlib/utils.go

@@ -19,14 +19,14 @@ type BPMLock struct {
 }
 
 func LockBPM(rootDir string) (*BPMLock, error) {
-	// Create parent directories if they don't already exist
-	err := os.MkdirAll(path.Join(rootDir, "/var/lib/bpm"), 0755)
+	// Create cache directory if it doesn't already exist
+	err := os.MkdirAll(path.Join(rootDir, "/var/cache/bpm"), 0755)
 	if err != nil {
 		return nil, err
 	}
 
 	// Create file
-	f, err := os.Create(path.Join(rootDir, "var/lib/bpm/bpm.lock"))
+	f, err := os.Create(path.Join(rootDir, "var/cache/bpm/bpm.lock"))
 	if err != nil {
 		return nil, err
 	}
@@ -37,7 +37,7 @@ func LockBPM(rootDir string) (*BPMLock, error) {
 		return nil, err
 	}
 
-	return &BPMLock{f, path.Join(rootDir, "var/lib/bpm/bpm.lock")}, nil
+	return &BPMLock{f, path.Join(rootDir, "var/cache/bpm/bpm.lock")}, nil
 }
 
 func (lock *BPMLock) Unlock() error {