Separate root remounting into new function and improve killProcesses function

services/agetty-tty1.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty --noclear tty1
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

services/agetty-tty2.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty tty2
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

services/agetty-tty3.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty tty3
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

services/agetty-tty4.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty tty4
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

services/agetty-tty5.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty tty5
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

services/agetty-tty6.esv

@@ -5,3 +5,4 @@ start_cmd: /usr/bin/setsid /sbin/agetty tty6
 exit_method: kill
 crash_on_safe_exit: false
 restart: always
+setpgid: false

src/ectl/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -57,7 +58,57 @@ func main() {
 		return
 	} else if flag.Args()[0] == "service" || flag.Args()[0] == "sv" {
 		if len(flag.Args()) <= 1 {
-			fmt.Println("Usage: ectl service <start/stop/enable/disable/status/list> [service]")
+			fmt.Println("Usage: ectl service <reload/start/stop/enable/disable/status/list> [service]")
+			return
+		}
+		if flag.Arg(1) == "reload" {
+			type ServiceCommandJsonStruct struct {
+				Command string `json:"command"`
+				Service string `json:"service"`
+			}
+			serviceCommandJson := ServiceCommandJsonStruct{
+				Command: flag.Arg(1),
+			}
+
+			// Encode struct to json string
+			jsonData, err := json.Marshal(serviceCommandJson)
+			if err != nil {
+				log.Fatalf("Could not encode JSON data! Error: %s\n", err)
+			}
+
+			_, err = conn.Write(jsonData)
+			if err != nil {
+				log.Fatalf("Could not write JSON data to socket! Error: %s\n", err)
+			}
+
+			// Read data from the connection.
+			data, err := readAllConn(conn)
+			if err != nil {
+				log.Fatalf("Could not read data from socket! Error: %s\n", err)
+				return
+			}
+
+			// Print json data if flag is set
+			if *printJson {
+				fmt.Println(string(data))
+				return
+			}
+
+			// Decoode JSON data
+			var returnedJsonData map[string]any
+			err = json.Unmarshal(data, &returnedJsonData)
+			if err != nil {
+				log.Fatalf("Could not decode JSON data from connection!")
+			}
+
+			if err, ok := returnedJsonData["error"]; ok {
+				log.Fatal(err)
+			} else if msg, ok := returnedJsonData["success"]; ok {
+				fmt.Println(msg)
+			} else {
+				log.Fatal("Connection returned empty string!")
+			}
+
 			return
 		} else if flag.Arg(1) == "start" || flag.Arg(1) == "stop" || flag.Arg(1) == "restart" {
 			// Ensure service name argument has been set
@@ -86,27 +137,22 @@ func main() {
 				log.Fatalf("Could not write JSON data to socket! Error: %s\n", err)
 			}
 
-			// Create a buffer for incoming data.
-			buf := make([]byte, 4096)
-
 			// Read data from the connection.
-			n, err := conn.Read(buf)
-			if err == io.EOF {
-				return
-			}
+			data, err := readAllConn(conn)
 			if err != nil {
+				log.Fatalf("Could not read data from socket! Error: %s\n", err)
 				return
 			}
 
 			// Print json data if flag is set
 			if *printJson {
-				fmt.Println(string(buf[:n]))
+				fmt.Println(string(data))
 				return
 			}
 
 			// Decoode JSON data
 			var returnedJsonData map[string]any
-			err = json.Unmarshal(buf[:n], &returnedJsonData)
+			err = json.Unmarshal(data, &returnedJsonData)
 			if err != nil {
 				log.Fatalf("Could not decode JSON data from connection!")
 			}
@@ -162,27 +208,22 @@ func main() {
 				log.Fatalf("Could not write JSON data to socket! Error: %s\n", err)
 			}
 
-			// Create a buffer for incoming data.
-			buf := make([]byte, 4096)
-
 			// Read data from the connection.
-			n, err := conn.Read(buf)
-			if err == io.EOF {
-				return
-			}
+			data, err := readAllConn(conn)
 			if err != nil {
+				log.Fatalf("Could not read data from socket! Error: %s\n", err)
 				return
 			}
 
 			// Print json data if flag is set
 			if *printJson {
-				fmt.Println(string(buf[:n]))
+				fmt.Println(string(data))
 				return
 			}
 
 			// Decoode JSON data
 			var returnedJsonData map[string]any
-			err = json.Unmarshal(buf[:n], &returnedJsonData)
+			err = json.Unmarshal(data, &returnedJsonData)
 			if err != nil {
 				log.Fatalf("Could not decode JSON data from connection!")
 			}
@@ -223,27 +264,22 @@ func main() {
 				log.Fatalf("Could not write JSON data to socket! Error: %s\n", err)
 			}
 
-			// Create a buffer for incoming data.
-			buf := make([]byte, 4096)
-
 			// Read data from the connection.
-			n, err := conn.Read(buf)
-			if err == io.EOF {
-				return
-			}
+			data, err := readAllConn(conn)
 			if err != nil {
+				log.Fatalf("Could not read data from socket! Error: %s\n", err)
 				return
 			}
 
 			// Print json data if flag is set
 			if *printJson {
-				fmt.Println(string(buf[:n]))
+				fmt.Println(string(data))
 				return
 			}
 
 			// Decoode JSON data
 			var returnedJsonData map[string]any
-			err = json.Unmarshal(buf[:n], &returnedJsonData)
+			err = json.Unmarshal(data, &returnedJsonData)
 			if err != nil {
 				log.Fatalf("Could not decode JSON data from connection!")
 			}
@@ -253,11 +289,13 @@ func main() {
 			}
 
 			serviceState := returnedJsonData["state"].(string)
+			serviceDescription := returnedJsonData["description"].(string)
 			serviceEnabled := returnedJsonData["is_enabled"].(bool)
 			serviceStage := int(returnedJsonData["stage"].(float64))
 			processID := int(returnedJsonData["process_id"].(float64))
 
 			fmt.Printf("Name: %s\n", flag.Arg(2))
+			fmt.Printf("Description: %s\n", serviceDescription)
 			fmt.Printf("State: %s\n", serviceState)
 			if serviceEnabled {
 				fmt.Printf("Enabled: %t (Stage %d)\n", serviceEnabled, serviceStage)
@@ -288,27 +326,22 @@ func main() {
 				log.Fatalf("Could not write JSON data to socket! Error: %s\n", err)
 			}
 
-			// Create a buffer for incoming data.
-			buf := make([]byte, 4096)
-
 			// Read data from the connection.
-			n, err := conn.Read(buf)
-			if err == io.EOF {
-				return
-			}
+			data, err := readAllConn(conn)
 			if err != nil {
+				log.Fatalf("Could not read data from socket! Error: %s\n", err)
 				return
 			}
 
 			// Print json data if flag is set
 			if *printJson {
-				fmt.Println(string(buf[:n]))
+				fmt.Println(string(data))
 				return
 			}
 
 			// Decoode JSON data
 			var returnedJsonData map[string]any
-			err = json.Unmarshal(buf[:n], &returnedJsonData)
+			err = json.Unmarshal(data, &returnedJsonData)
 			if err != nil {
 				log.Fatalf("Could not decode JSON data from connection!")
 			}
@@ -319,12 +352,14 @@ func main() {
 
 			for _, serviceMap := range returnedJsonData["services"].([]any) {
 				serviceName := serviceMap.(map[string]any)["name"].(string)
+				serviceDescription := serviceMap.(map[string]any)["description"].(string)
 				serviceState := serviceMap.(map[string]any)["state"].(string)
 				serviceEnabled := serviceMap.(map[string]any)["is_enabled"].(bool)
 				serviceStage := int(serviceMap.(map[string]any)["stage"].(float64))
 				processID := int(serviceMap.(map[string]any)["process_id"].(float64))
 
 				fmt.Printf("Name: %s\n", serviceName)
+				fmt.Printf("Description: %s\n", serviceDescription)
 				fmt.Printf("State: %s\n", serviceState)
 				if serviceEnabled {
 					fmt.Printf("Enabled: %t (Stage %d)\n", serviceEnabled, serviceStage)
@@ -374,3 +409,24 @@ func dialSocket() {
 		log.Fatalf("Failed to set write deadline! Error: %s\n", err)
 	}
 }
+
+func readAllConn(conn net.Conn) ([]byte, error) {
+	var buf bytes.Buffer
+
+	for {
+		dataChunk := make([]byte, 1024)
+
+		n, err := conn.Read(dataChunk)
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+
+		buf.Write(dataChunk[:n])
+
+		if n < 1024 {
+			break
+		}
+	}
+
+	return buf.Bytes(), nil
+}

src/enit/go.mod

@@ -2,4 +2,7 @@ module enit
 
 go 1.23.4
 
-require golang.org/x/sys v0.31.0
+require (
+	github.com/mitchellh/go-ps v1.0.0
+	golang.org/x/sys v0.31.0
+)

src/enit/go.sum

@@ -1,2 +1,4 @@
+github.com/mitchellh/go-ps v1.0.0 h1:i6ampVEEF4wQFF+bkYfwYgY+F/uYJDktmvLPf7qIgjc=
+github.com/mitchellh/go-ps v1.0.0/go.mod h1:J4lOc8z8yJs6vUwklHw2XEIiT4z4C40KtWVN3nvg8Pg=
 golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
 golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

src/enit/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bufio"
 	"flag"
 	"fmt"
 	"log"
@@ -12,6 +13,8 @@ import (
 	"syscall"
 	"time"
 	"unsafe"
+
+	"github.com/mitchellh/go-ps"
 )
 
 // Build-time variables
@@ -78,42 +81,42 @@ func mountVirtualFilesystems() {
 
 	// Mount /proc
 	if err := mount("proc", "/proc", "proc", commonOptions+",nodev,noexec", false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /proc: %s", err)
 	}
 
 	// Mount /sys
 	if err := mount("sys", "/sys", "sysfs", commonOptions+",nodev,noexec", false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /sys: %s", err)
 	}
 
 	// Mount /dev
 	if err := mount("dev", "/dev", "devtmpfs", commonOptions+",mode=755,inode64", false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /dev: %s", err)
 	}
 
 	// Mount /run
 	if err := mount("run", "/run", "tmpfs", commonOptions+",nodev,mode=755,inode64", false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /run: %s", err)
 	}
 
 	// Mount /dev/pts
 	if err := mount("devpts", "/dev/pts", "devpts", commonOptions+",gid=5,mode=620,ptmxmode=000", true); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /dev/pts: %s", err)
 	}
 
 	// Mount /dev/shm
 	if err := mount("shm", "/dev/shm", "tmpfs", commonOptions+",nodev,inode64", true); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /dev/shm: %s", err)
 	}
 
 	// Mount securityfs
 	if err := mount("securityfs", "/sys/kernel/security", "securityfs", commonOptions, false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /sys/kernel/security: %s", err)
 	}
 
 	// Mount cgroups v2
 	if err := mount("cgroup2", "/sys/fs/cgroup", "cgroup2", commonOptions+",noexec,nsdelegate,memory_recursiveprot", false); err != nil {
-		panic(err)
+		printErrorAndReboot("Error: could not mount /sys/fs/cgroup: %s", err)
 	}
 
 	fmt.Println("Done.")
@@ -122,9 +125,8 @@ func mountVirtualFilesystems() {
 func mountFilesystems() {
 	fmt.Print("Mounting fstab entries... ")
 
-	if err := mountFstabEntries(); err != nil {
-		log.Println("Could not mount fstab entries!")
-		panic(err)
+	if err, line := mountFstabEntries(); err != nil {
+		printErrorAndReboot("Error: could not mount fstab entry on line %d: %s", line, err)
 	}
 
 	fmt.Println("Done.")
@@ -138,8 +140,7 @@ func startServiceManager() {
 	cmd.Stderr = os.Stderr
 	err := cmd.Start()
 	if err != nil {
-		log.Println("Could not initialize service manager!")
-		panic(err)
+		printErrorAndReboot("Error: could not initialize service manager: %s", err)
 	}
 	serviceManagerPid = cmd.Process.Pid
 
@@ -185,6 +186,42 @@ func stopServiceManager() {
 
 }
 
+func killProcesses() {
+	fmt.Print("Killing processes... ")
+
+	// Send sigterm to all processes
+	processes, err := ps.Processes()
+	if err != nil {
+		return
+	}
+	for _, process := range processes {
+		sid, _, _ := syscall.Syscall(syscall.SYS_GETSID, uintptr(process.Pid()), 0, 0)
+		if process.Pid() == 1 || sid == 1 {
+			continue
+		}
+
+		syscall.Kill(process.Pid(), syscall.SIGTERM)
+	}
+
+	time.Sleep(1 * time.Second)
+
+	// Send sigkill to remaining processes
+	processes, err = ps.Processes()
+	if err != nil {
+		return
+	}
+	for _, process := range processes {
+		sid, _, _ := syscall.Syscall(syscall.SYS_GETSID, uintptr(process.Pid()), 0, 0)
+		if process.Pid() == 1 || sid == 1 {
+			continue
+		}
+
+		syscall.Kill(process.Pid(), syscall.SIGKILL)
+	}
+
+	fmt.Println("Done.")
+}
+
 func setHostname() {
 	fmt.Print("Setting hostname... ")
 
@@ -215,16 +252,12 @@ func waitZombieProcesses() {
 func catchSignals() {
 	sigc := make(chan os.Signal, 1)
 	signal.Notify(sigc, syscall.SIGUSR1, syscall.SIGTERM, syscall.SIGINT, syscall.SIGCHLD)
-	defer close(sigc)
-	defer signal.Stop(sigc)
 	for {
 		switch <-sigc {
 		case syscall.SIGUSR1:
-			close(sigc)
 			signal.Stop(sigc)
 			shutdownSystem()
 		case syscall.SIGTERM, syscall.SIGINT:
-			close(sigc)
 			signal.Stop(sigc)
 			rebootSystem()
 		case syscall.SIGCHLD:
@@ -237,9 +270,13 @@ func shutdownSystem() {
 	fmt.Println("Shutting down...")
 
 	stopServiceManager()
+	killProcesses()
+	unmountFilesystems()
+	remountRootReadonly()
 
-	fmt.Println("Syncing disks...")
+	fmt.Print("Syncing disks... ")
 	syscall.Sync()
+	fmt.Println("Done.")
 
 	fmt.Println("Sending shutdown syscall...")
 	err := syscall.Reboot(syscall.LINUX_REBOOT_CMD_POWER_OFF)
@@ -252,9 +289,13 @@ func rebootSystem() {
 	fmt.Println("Rebooting...")
 
 	stopServiceManager()
+	killProcesses()
+	unmountFilesystems()
+	remountRootReadonly()
 
-	fmt.Println("Syncing disks...")
+	fmt.Print("Syncing disks... ")
 	syscall.Sync()
+	fmt.Println("Done.")
 
 	fmt.Println("Sending reboot syscall...")
 	err := syscall.Reboot(syscall.LINUX_REBOOT_CMD_RESTART)
@@ -262,3 +303,10 @@ func rebootSystem() {
 		panic(err)
 	}
 }
+
+func printErrorAndReboot(format string, v ...any) {
+	log.Printf(format, v...)
+	fmt.Println("Press 'Enter' to reboot...")
+	bufio.NewReader(os.Stdin).ReadBytes('\n')
+	rebootSystem()
+}

src/enit/mount.go

@@ -1,10 +1,14 @@
 package main
 
 import (
+	"errors"
 	"fmt"
+	"log"
 	"os"
 	"slices"
 	"strings"
+	"syscall"
+	"time"
 	"unsafe"
 
 	"golang.org/x/sys/unix"
@@ -28,12 +32,14 @@ var flagsEquivalence = map[string]uintptr{
 }
 
 // Split string flags to mount flags and mount data
-func convertMountOptions(options string) (flags []uintptr, data string) {
+func convertMountOptions(options string) (flags []uintptr, data string, extra []string) {
 	for _, flag := range strings.Split(options, ",") {
 		if unixFlag, ok := flagsEquivalence[flag]; ok {
 			flags = append(flags, unixFlag)
 		} else {
-			if data == "" {
+			if flag == "noauto" || flag == "nofail" {
+				extra = append(extra, flag)
+			} else if data == "" {
 				data = flag
 			} else {
 				data += "," + flag
@@ -41,7 +47,7 @@ func convertMountOptions(options string) (flags []uintptr, data string) {
 		}
 	}
 
-	return flags, data
+	return flags, data, extra
 }
 
 // Combine a unix flag slice or array into a single uintptr
@@ -84,7 +90,7 @@ func isMountpoint(mountpoint string) bool {
 }
 
 func mount(source, target, fstype string, options string, mkdir bool) error {
-	flags, data := convertMountOptions(options)
+	flags, data, _ := convertMountOptions(options)
 
 	if isMountpoint(target) && !slices.Contains(flags, unix.MS_REMOUNT) {
 		flags = append(flags, unix.MS_REMOUNT)
@@ -104,34 +110,68 @@ func mount(source, target, fstype string, options string, mkdir bool) error {
 	return nil
 }
 
-func mountFstabEntries() error {
+func mountFstabEntries() (error, int) {
 	if _, err := os.Stat("/etc/fstab"); os.IsNotExist(err) {
-		return nil
+		return nil, 0
 	} else if err != nil {
-		return err
+		return err, 0
 	}
 
 	bytes, err := os.ReadFile("/etc/fstab")
 	if err != nil {
-		return err
+		return err, 0
 	}
 
 	swapPriority := -2
 
-	for _, line := range strings.Split(string(bytes), "\n") {
+	for i, line := range strings.Split(string(bytes), "\n") {
 		line = strings.TrimSpace(line)
 		if strings.HasPrefix(line, "#") || line == "" {
 			continue
 		}
 
-		source := strings.Split(line, " ")[0]
-		target := strings.Split(line, " ")[1]
-		fstype := strings.Split(line, " ")[2]
-		options := strings.Split(line, " ")[3]
+		// Get fields from line
+		fields := []string{}
+		sb := &strings.Builder{}
+		quoted := false
+		for _, r := range line {
+			if r == '"' {
+				quoted = !quoted
+			} else if !quoted && r == ' ' {
+				str := sb.String()
+				if len(strings.TrimSpace(str)) > 0 {
+					fields = append(fields, sb.String())
+				}
+				sb.Reset()
+			} else {
+				sb.WriteRune(r)
+			}
+		}
+		if sb.Len() > 0 {
+			fields = append(fields, sb.String())
+		}
+		if len(fields) < 4 {
+			return fmt.Errorf("Not enough fields"), i + 1
+		}
+		source := fields[0]
+		target := fields[1]
+		fstype := fields[2]
+		options := fields[3]
 
-		flags, data := convertMountOptions(options)
+		// Replace device prefixes
+		if cutSource, ok := strings.CutPrefix(source, "LABEL="); ok {
+			source = "/dev/disk/by-label/" + strings.ReplaceAll(cutSource, " ", "\\x20")
+		} else if cutSource, ok := strings.CutPrefix(source, "UUID="); ok {
+			source = "/dev/disk/by-uuid/" + cutSource
+		} else if cutSource, ok := strings.CutPrefix(source, "PARTLABEL="); ok {
+			source = "/dev/disk/by-partlabel/" + cutSource
+		} else if cutSource, ok := strings.CutPrefix(source, "PARTUUID="); ok {
+			source = "/dev/disk/by-partuuid/" + cutSource
+		}
 
-		if slices.Contains(strings.Split(data, ","), "noauto") {
+		flags, data, extra := convertMountOptions(options)
+
+		if slices.Contains(extra, "noauto") {
 			continue
 		}
 
@@ -142,7 +182,11 @@ func mountFstabEntries() error {
 			_, _, err := unix.Syscall(unix.SYS_SWAPON, uintptr(unsafe.Pointer(&b[0])), uintptr((swapPriority<<SwapFlagPrioShift)&SwapFlagPrioMask), 0)
 			swapPriority--
 			if err != 0 {
-				return fmt.Errorf("swapon syscall returned none-zero error code: %d", err)
+				if slices.Contains(extra, "nofail") {
+					fmt.Printf("Warning: could not mount fstab entry on line %d: swapon syscall returned non-zero exit code: %d\n", i+1, err)
+				} else {
+					return fmt.Errorf("swapon syscall returned non-zero exit code: %d", err), i + 1
+				}
 			}
 			continue
 		}
@@ -152,9 +196,168 @@ func mountFstabEntries() error {
 		}
 
 		if err := unix.Mount(source, target, fstype, combineUnixFlags(flags), data); err != nil {
-			return err
+			if slices.Contains(extra, "nofail") {
+				log.Printf("Warning: could not mount fstab entry on line %d: %s\n", i+1, err)
+			} else {
+				return err, i + 1
+			}
 		}
 	}
 
-	return nil
+	return nil, 0
+}
+
+func unmountFilesystems() {
+	// Disable all swap memory
+	data, err := os.ReadFile("/proc/swaps")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for i, entry := range strings.Split(string(data), "\n") {
+		if i == 0 {
+			continue
+		}
+		entry = strings.TrimSpace(entry)
+		if len(entry) == 0 {
+			continue
+		}
+
+		mountpoint := strings.Fields(entry)[0]
+
+		// Unmount swap at mountpoint
+		fmt.Printf("Disabling swap at %s... ", mountpoint)
+		b := append([]byte(mountpoint), 0)
+		_, _, err := unix.Syscall(unix.SYS_SWAPOFF, uintptr(unsafe.Pointer(&b[0])), 0, 0)
+		if err == 0 {
+			fmt.Println("Done.")
+		} else {
+			fmt.Printf("Error: %s\n", err.Error())
+		}
+	}
+
+	data, err = os.ReadFile("/proc/self/mountinfo")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Unmount filesystems
+	entries := strings.Split(string(data), "\n")
+	slices.Reverse(entries)
+	for _, entry := range entries {
+		entry = strings.TrimSpace(entry)
+		if len(entry) == 0 {
+			continue
+		}
+
+		// Get entry fields
+		fields := strings.Fields(entry)
+		mountpoint := fields[4]
+		filesystem := ""
+		for i := 6; i < len(fields); i++ {
+			if fields[i] == "-" {
+				filesystem = fields[i+1]
+				break
+			}
+		}
+
+		// Skip root filesystem
+		if mountpoint == "/" {
+			continue
+		}
+
+		// Skip root and ignored filesystems
+		ignoredFilesystems := []string{
+			"devtmpfs",
+			"proc",
+			"sysfs",
+			"tmpfs",
+		}
+
+		if slices.Contains(ignoredFilesystems, filesystem) {
+			continue
+		}
+
+		// Unmount filesystem at mountpoint
+		fmt.Printf("Unmounting %s...", mountpoint)
+		tries := 0
+		for {
+			err := unix.Unmount(mountpoint, 0)
+			if errors.Is(err, syscall.EBUSY) {
+				fmt.Print(".")
+				tries++
+				time.Sleep(1 * time.Second)
+				if tries >= 60 {
+					unix.Unmount(mountpoint, syscall.MNT_FORCE)
+					fmt.Println(" Timeout.")
+					break
+				}
+			} else if err != nil {
+				fmt.Printf(" Error: %s\n", err.Error())
+				break
+			} else {
+				fmt.Println(" Done.")
+				break
+			}
+		}
+	}
+}
+
+func remountRootReadonly() {
+	fmt.Print("Remounting root as read-only...")
+
+	data, err := os.ReadFile("/proc/self/mountinfo")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	filesystem := ""
+	source := ""
+	fsData := ""
+
+	// Get root filesystems
+	entries := strings.Split(string(data), "\n")
+	slices.Reverse(entries)
+	for _, entry := range entries {
+		entry = strings.TrimSpace(entry)
+		if len(entry) == 0 {
+			continue
+		}
+
+		// Get entry fields
+		fields := strings.Fields(entry)
+		mountpoint := fields[4]
+		for i := 6; i < len(fields); i++ {
+			if fields[i] == "-" {
+				filesystem = fields[i+1]
+				source = fields[i+2]
+				fsData = fields[i+3]
+				break
+			}
+		}
+
+		if mountpoint == "/" {
+			break
+		}
+	}
+
+	tries := 0
+	for {
+		err := unix.Mount(source, "/", filesystem, syscall.MS_RDONLY|syscall.MS_REMOUNT, fsData)
+		if errors.Is(err, syscall.EBUSY) {
+			fmt.Print(".")
+			tries++
+			time.Sleep(1 * time.Second)
+			if tries >= 60 {
+				fmt.Println(" Timeout.")
+				break
+			}
+		} else if err != nil {
+			fmt.Printf(" Error: %s\n", err.Error())
+			break
+		} else {
+			fmt.Println(" Done.")
+			break
+		}
+	}
 }

src/esvm/main.go

@@ -14,8 +14,6 @@ import (
 	"strings"
 	"syscall"
 	"time"
-
-	"gopkg.in/yaml.v3"
 )
 
 // Build-time variables
@@ -135,67 +133,13 @@ func Init() {
 	// Read and initialize service files
 	for _, entry := range dirEntries {
 		if !entry.IsDir() && strings.HasSuffix(entry.Name(), ".esv") {
-			logger.Printf("Initializing service (%s)...\n", entry.Name())
-			bytes, err := os.ReadFile(path.Join(serviceConfigDir, "services", entry.Name()))
-			if err != nil {
-				logger.Printf("Error: Could not read service file (%s)", path.Join(serviceConfigDir, "services", entry.Name()))
-				continue
-			}
-
-			service := EnitService{
-				Name:            "",
-				Description:     "",
-				Dependencies:    make([]string, 0),
-				Type:            "",
-				StartCmd:        "",
-				ExitMethod:      "",
-				StopCmd:         "",
-				Restart:         "",
-				CrashOnSafeExit: true,
-				restartCount:    0,
-				stopChannel:     make(chan bool),
-				LogOutput:       true,
-				state:           EnitServiceUnloaded,
-			}
-			if err := yaml.Unmarshal(bytes, &service); err != nil {
-				logger.Printf("Error: could not read service file %s", path.Join(serviceConfigDir, "services", entry.Name()))
-				continue
-			}
-
-			for _, sv := range Services {
-				if sv.Name == service.Name {
-					logger.Printf("Error: service with name (%s) has already been initialized", service.Name)
-				}
-			}
-
-			switch service.Type {
-			case "simple", "background":
-			default:
-				logger.Printf("Error: unknown service type (%s)", service.Type)
-				continue
-			}
-
-			switch service.ExitMethod {
-			case "stop_command", "kill":
-			default:
-				logger.Printf("Error: unknown exit method (%s)\n", service.ExitMethod)
-				continue
-			}
-
-			switch service.Restart {
-			case "true", "always":
-			default:
-				service.Restart = "false"
-			}
-
-			Services = append(Services, &service)
-
-			logger.Printf("Service (%s) has been initialized!\n", service.Name)
+			filepath := path.Join(serviceConfigDir, "services", entry.Name())
+			LoadService(filepath)
 		}
 	}
 
 	// Read enabled services
-	ReadEnabledServices()
+	EnabledServices := ReadEnabledServices()
 
 	// Start enabled services
 	stages := slices.Collect(maps.Keys(EnabledServices))
@@ -213,7 +157,6 @@ func Init() {
 					continue
 				}
 
-				if len(service.GetUnmetDependencies()) == 0 {
 				err := service.StartService()
 				if err != nil {
 					logger.Printf("Error: could not start service (%s): %s", service.Name, err)
@@ -222,11 +165,38 @@ func Init() {
 			}
 		}
 	}
-	}
 
 	logger.Println("ESVM initialized successfully!")
 }
 
+func Reload() {
+	logger.Println("Reloading all ESVM services...")
+
+	dirEntries, err := os.ReadDir(path.Join(serviceConfigDir, "services"))
+	if err != nil {
+		logger.Fatalf("Error: Could not initialize ESVM: %s", err)
+	}
+
+	// Read and load service files
+	servicesToRemove := slices.Clone(Services)
+	for _, entry := range dirEntries {
+		if !entry.IsDir() && strings.HasSuffix(entry.Name(), ".esv") {
+			filepath := path.Join(serviceConfigDir, "services", entry.Name())
+			LoadService(filepath)
+			servicesToRemove = slices.DeleteFunc(servicesToRemove, func(sv *EnitService) bool {
+				return sv.Filepath == filepath
+			})
+		}
+	}
+
+	// Reload services that had their esv file removed
+	for _, service := range servicesToRemove {
+		LoadService(service.Filepath)
+	}
+
+	logger.Println("All ESVM services have been reloaded!")
+}
+
 func Destroy() {
 	logger.Println("Stopping all ESVM services...")
 

src/esvm/service.go

@@ -1,7 +1,9 @@
 package main
 
 import (
+	"crypto/sha256"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"path"
@@ -18,6 +20,7 @@ type EnitServiceState uint8
 const (
 	EnitServiceUnknown EnitServiceState = iota
 	EnitServiceUnloaded
+	EnitServiceStarting
 	EnitServiceRunning
 	EnitServiceStopped
 	EnitServiceCrashed
@@ -27,6 +30,7 @@ const (
 var EnitServiceStateNames map[EnitServiceState]string = map[EnitServiceState]string{
 	EnitServiceUnknown:   "unknown",
 	EnitServiceUnloaded:  "unloaded",
+	EnitServiceStarting:  "starting",
 	EnitServiceRunning:   "running",
 	EnitServiceStopped:   "stopped",
 	EnitServiceCrashed:   "crashed",
@@ -36,43 +40,27 @@ var EnitServiceStateNames map[EnitServiceState]string = map[EnitServiceState]str
 type EnitService struct {
 	Name             string `yaml:"name"`
 	Description      string `yaml:"description,omitempty"`
-	Dependencies    []string `yaml:"dependencies,omitempty"`
 	Type             string `yaml:"type"`
 	StartCmd         string `yaml:"start_cmd"`
 	ExitMethod       string `yaml:"exit_method"`
 	CrashOnSafeExit  bool   `yaml:"crash_on_safe_exit"`
 	StopCmd          string `yaml:"stop_cmd,omitempty"`
 	Restart          string `yaml:"restart,omitempty"`
+	ReadyFd          int    `yaml:"ready_fd"`
+	Setpgid          bool   `yaml:"setpgid"`
 	LogOutput        bool   `yaml:"log_output,omitempty"`
+	Filepath         string
+	filepathChecksum [32]byte
 	state            EnitServiceState
 	processID        int
 	restartCount     int
 	stopChannel      chan bool
+	shouldReload     bool
 }
 
 var Services = make([]*EnitService, 0)
-var EnabledServices = make(map[int][]string)
 var startedServicesOrder = make([]string, 0)
 
-func (service *EnitService) GetUnmetDependencies() (missingDependencies []string) {
-	for _, dependency := range service.Dependencies {
-		if strings.HasPrefix(dependency, "/") {
-			// File dependency
-			if _, err := os.Stat(dependency); err != nil {
-				missingDependencies = append(missingDependencies, dependency)
-			}
-		} else {
-			// Service dependency
-			depService := GetServiceByName(dependency)
-			if depService == nil {
-				missingDependencies = append(missingDependencies, dependency)
-			}
-		}
-	}
-
-	return missingDependencies
-}
-
 func (service *EnitService) GetProcess() *os.Process {
 	process, _ := os.FindProcess(service.processID)
 
@@ -113,7 +101,121 @@ func (service *EnitService) GetLogFile() (file *os.File, err error) {
 	return file, nil
 }
 
-func (service *EnitService) StartService() error {
+func LoadService(filepath string) {
+	bytes, err := os.ReadFile(filepath)
+	checksum := sha256.Sum256(bytes)
+
+	var serviceToReload *EnitService
+
+	// Check if service is already loaded
+	for _, service := range Services {
+		if service.Filepath != filepath {
+			continue
+		}
+
+		if slices.Equal(checksum[:], service.filepathChecksum[:]) {
+			return
+		}
+
+		if service.state == EnitServiceStarting || service.state == EnitServiceRunning {
+			service.shouldReload = true
+			logger.Printf("Warning: Service (%s) is currently running and will be reloaded when stopped\n", service.Name)
+			return
+		}
+		service.shouldReload = false
+		serviceToReload = service
+
+		break
+	}
+
+	if serviceToReload == nil {
+		logger.Printf("Loading service (%s)...\n", filepath)
+	} else {
+		logger.Printf("Reloading service (%s)...\n", filepath)
+	}
+
+	if os.IsNotExist(err) {
+		Services = slices.DeleteFunc(Services, func(sv *EnitService) bool {
+			if sv.Filepath == filepath {
+				logger.Printf("Service (%s) has been removed\n", sv.Name)
+				return true
+			}
+			return false
+		})
+
+		return
+	} else if err != nil {
+		logger.Printf("Error: Could not read service file (%s)", filepath)
+		return
+	}
+
+	newService := EnitService{
+		Name:             "",
+		Description:      "",
+		Type:             "",
+		StartCmd:         "",
+		ExitMethod:       "",
+		StopCmd:          "",
+		Restart:          "",
+		Setpgid:          true,
+		CrashOnSafeExit:  true,
+		LogOutput:        true,
+		Filepath:         filepath,
+		filepathChecksum: sha256.Sum256(bytes),
+		restartCount:     0,
+		stopChannel:      make(chan bool),
+		state:            EnitServiceUnloaded,
+	}
+	if serviceToReload != nil {
+		newService.restartCount = serviceToReload.restartCount
+		newService.stopChannel = serviceToReload.stopChannel
+		newService.state = serviceToReload.state
+	}
+	if err := yaml.Unmarshal(bytes, &newService); err != nil {
+		logger.Printf("Error: could not read service file %s", filepath)
+		return
+	}
+
+	for _, sv := range Services {
+		if sv.Name == newService.Name && sv != serviceToReload {
+			logger.Printf("Error: service with name (%s) has already been loaded", newService.Name)
+			return
+		}
+	}
+
+	switch newService.Type {
+	case "simple", "background":
+	default:
+		logger.Printf("Error: unknown service type (%s)", newService.Type)
+		return
+	}
+
+	switch newService.ExitMethod {
+	case "stop_command", "kill":
+	default:
+		logger.Printf("Error: unknown exit method (%s)\n", newService.ExitMethod)
+		return
+	}
+
+	switch newService.Restart {
+	case "true", "always":
+	default:
+		newService.Restart = "false"
+	}
+
+	for i, sv := range Services {
+		if sv == serviceToReload {
+			Services[i] = &newService
+			logger.Printf("Service (%s) has been reloaded!\n", newService.Name)
+			return
+		}
+	}
+
+	Services = append(Services, &newService)
+	logger.Printf("Service (%s) has been loaded!\n", newService.Name)
+}
+
+func (service *EnitService) StartService() (err error) {
 	if service == nil {
 		return nil
 	}
@@ -126,7 +228,6 @@ func (service *EnitService) StartService() error {
 	// Get log file if service logs output
 	var logFile *os.File
 	if service.LogOutput {
-		var err error
 		logFile, err = service.GetLogFile()
 		if err != nil {
 			return err
@@ -134,10 +235,38 @@ func (service *EnitService) StartService() error {
 	}
 
 	cmd := exec.Command("/bin/sh", "-c", "exec "+service.StartCmd)
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: service.Setpgid, Pgid: 0}
 	if logFile != nil {
 		cmd.Stdout = logFile
 		cmd.Stderr = logFile
 	}
+	var pipeReader, pipeWriter *os.File
+	if service.ReadyFd > 2 {
+		pipeReader, pipeWriter, err = os.Pipe()
+		if err != nil {
+			// Close log file if not nil
+			if logFile != nil {
+				logFile.Close()
+			}
+
+			return err
+		}
+
+		err := pipeReader.SetDeadline(time.Now().Add(10 * time.Second))
+		if err != nil {
+			// Close log file if not nil
+			if logFile != nil {
+				logFile.Close()
+			}
+
+			return err
+		}
+
+		for i := 3; i < service.ReadyFd; i++ {
+			cmd.ExtraFiles = append(cmd.ExtraFiles, nil)
+		}
+		cmd.ExtraFiles = append(cmd.ExtraFiles, pipeWriter)
+	}
 	if err := cmd.Start(); err != nil {
 		// Close log file if not nil
 		if logFile != nil {
@@ -147,7 +276,30 @@ func (service *EnitService) StartService() error {
 		return err
 	}
 
+	pid := cmd.Process.Pid
 	service.processID = cmd.Process.Pid
+	service.state = EnitServiceStarting
+
+	// Wait for data from pipe
+	if pipeReader != nil {
+		buffer := make([]byte, 1)
+		_, err := io.ReadAtLeast(pipeReader, buffer, 1)
+		if err != nil {
+			// Close log file if not nil
+			if logFile != nil {
+				logFile.Close()
+			}
+
+			// Kill process and children
+			syscall.Kill(-pid, syscall.SIGKILL)
+
+			service.processID = 0
+			service.state = EnitServiceCrashed
+
+			return err
+		}
+	}
+
 	service.state = EnitServiceRunning
 
 	go func() {
@@ -162,10 +314,21 @@ func (service *EnitService) StartService() error {
 		case <-service.stopChannel:
 			service.restartCount = 0
 		default:
+			// Kill remaining child processes
+			syscall.Kill(-pid, syscall.SIGKILL)
+
 			if service.Type == "simple" && err == nil {
 				service.restartCount = 0
 				if service.ExitMethod != "stop_command" {
 					service.state = EnitServiceCompleted
+
+					// Reload service if needed
+					if service.shouldReload {
+						LoadService(service.Filepath)
+						if GetServiceByName(service.Name) == nil {
+							return
+						}
+					}
 				} else {
 					service.state = EnitServiceRunning
 				}
@@ -179,6 +342,15 @@ func (service *EnitService) StartService() error {
 				service.state = EnitServiceCrashed
 			}
 
+			// Reload service if needed
+			if service.shouldReload {
+				LoadService(service.Filepath)
+				if GetServiceByName(service.Name) == nil {
+					return
+				}
+				service = GetServiceByName(service.Name)
+			}
+
 			if service.Restart == "always" {
 				_ = service.StartService()
 			} else if service.Restart == "true" && service.restartCount < 5 {
@@ -206,11 +378,26 @@ func (service *EnitService) StopService() error {
 	}
 
 	logger.Printf("Stopping service (%s)...", service.Name)
+	pid := service.processID
 
 	newServiceStatus := EnitServiceCrashed
 	defer func() {
+		// Kill remaining child processes
+		if pid != 0 {
+			syscall.Kill(-pid, syscall.SIGKILL)
+		}
+
 		service.state = newServiceStatus
 		service.processID = 0
+
+		// Reload service if needed
+		if service.shouldReload {
+			LoadService(service.Filepath)
+			if GetServiceByName(service.Name) == nil {
+				return
+			}
+			service = GetServiceByName(service.Name)
+		}
 	}()
 
 	if service.ExitMethod == "kill" {
@@ -227,12 +414,20 @@ func (service *EnitService) StopService() error {
 			service.GetProcess().Signal(syscall.SIGKILL)
 			return fmt.Errorf("could not stop process gracefully")
 		}
+	} else {
+		go func() { service.stopChannel <- true }()
+
+		cmd := exec.Command("/bin/sh", "-c", service.StopCmd)
+		if err := cmd.Run(); err != nil {
+			return err
+		}
+	}
 
 	// Check if the process has stopped gracefully, otherwise send sigkill on timeout
 	exited := make(chan bool)
 	go func() {
 		for {
-				if err := service.GetProcess().Signal(syscall.Signal(0)); err != nil {
+			if err := syscall.Kill(pid, syscall.Signal(0)); err != nil {
 				break
 			}
 		}
@@ -245,12 +440,6 @@ func (service *EnitService) StopService() error {
 		service.GetProcess().Signal(syscall.SIGKILL)
 		return fmt.Errorf("could not stop process gracefully")
 	}
-	} else {
-		cmd := exec.Command("/bin/sh", "-c", service.StopCmd)
-		if err := cmd.Run(); err != nil {
-			return err
-		}
-	}
 
 	newServiceStatus = EnitServiceStopped
 	logger.Printf("Service (%s) has stopped!\n", service.Name)
@@ -263,6 +452,12 @@ func (service *EnitService) RestartService() error {
 		return err
 	}
 
+	// Get service from list in case of a reload
+	if GetServiceByName(service.Name) == nil {
+		return fmt.Errorf("service was removed")
+	}
+	service = GetServiceByName(service.Name)
+
 	if err := service.StartService(); err != nil {
 		return err
 	}
@@ -270,10 +465,8 @@ func (service *EnitService) RestartService() error {
 	return nil
 }
 
-// Functions will be rewritten at some point to allow enabling unloaded services
-
 func (service *EnitService) isEnabled() (bool, int) {
-	for stage, services := range EnabledServices {
+	for stage, services := range ReadEnabledServices() {
 		if slices.Contains(services, service.Name) {
 			return true, stage
 		}
@@ -291,6 +484,8 @@ func (service *EnitService) SetEnabled(stage int) error {
 		return nil
 	}
 
+	EnabledServices := ReadEnabledServices()
+
 	// Remove service from current stage
 	EnabledServices[s] = slices.DeleteFunc(EnabledServices[s], func(name string) bool {
 		return name == service.Name
@@ -317,10 +512,12 @@ func (service *EnitService) SetEnabled(stage int) error {
 	return nil
 }
 
-func ReadEnabledServices() error {
+func ReadEnabledServices() (EnabledServices map[int][]string) {
+	EnabledServices = make(map[int][]string)
+
 	data, err := os.ReadFile(path.Join(serviceConfigDir, "enabled_services"))
 	if err != nil {
-		return err
+		return EnabledServices
 	}
 
 	err = yaml.Unmarshal(data, &EnabledServices)
@@ -333,15 +530,15 @@ func ReadEnabledServices() error {
 		// Update enabled_services file
 		data, err := yaml.Marshal(EnabledServices)
 		if err != nil {
-			return err
+			return EnabledServices
 		}
 		err = os.WriteFile(path.Join(serviceConfigDir, "enabled_services"), data, 0644)
 		if err != nil {
-			return err
+			return EnabledServices
 		}
 
-		return nil
+		return EnabledServices
 	}
 
-	return nil
+	return EnabledServices
 }

src/esvm/socket.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -17,6 +18,7 @@ func initSocket() (socket net.Listener, err error) {
 	}
 
 	// Register command handlers
+	commandHandlers["reload"] = handleReloadServicesCommand
 	commandHandlers["start"] = handleStartServiceCommand
 	commandHandlers["stop"] = handleStopServiceCommand
 	commandHandlers["restart"] = handleRestartServiceCommand
@@ -31,27 +33,23 @@ func listenToSocket() {
 	conn, err := socket.Accept()
 	if err != nil {
 		logger.Println("Could not accept socket connection!")
-		panic(err)
+		return
 	}
 
 	// Handle the connection in a separate goroutine.
 	go func(conn net.Conn) {
 		defer conn.Close()
-		// Create a buffer for incoming data.
-		buf := make([]byte, 4096)
 
 		// Read data from the connection.
-		n, err := conn.Read(buf)
-		if err == io.EOF {
-			return
-		}
+		data, err := readAllConn(conn)
 		if err != nil {
+			logger.Fatalf("Could not read data from socket! Error: %s\n", err)
 			return
 		}
 
 		// Decoode JSON data
 		var jsonData map[string]any
-		err = json.Unmarshal(buf[:n], &jsonData)
+		err = json.Unmarshal(data, &jsonData)
 		if err != nil {
 			conn.Write(wrapErrorInJson(fmt.Errorf("Invalid JSON")))
 			return
@@ -74,6 +72,13 @@ func listenToSocket() {
 	}(conn)
 }
 
+func handleReloadServicesCommand(conn net.Conn, jsonData map[string]any) {
+	// Reload services
+	Reload()
+
+	conn.Write(wrapSuccessMsgInJson("Services reloaded successfully"))
+}
+
 func handleStartServiceCommand(conn net.Conn, jsonData map[string]any) {
 	// Get service name from json data
 	serviceName, ok := jsonData["service"]
@@ -222,6 +227,7 @@ func handleStatusServiceCommand(conn net.Conn, jsonData map[string]any) {
 
 	statusMap := make(map[string]any)
 	statusMap["name"] = service.Name
+	statusMap["description"] = service.Description
 	statusMap["state"] = EnitServiceStateNames[service.state]
 	statusMap["process_id"] = service.processID
 	statusMap["is_enabled"], statusMap["stage"] = service.isEnabled()
@@ -244,6 +250,7 @@ func handleListServicesCommand(conn net.Conn, _ map[string]any) {
 	for _, service := range Services {
 		statusMap := make(map[string]any)
 		statusMap["name"] = service.Name
+		statusMap["description"] = service.Description
 		statusMap["state"] = EnitServiceStateNames[service.state]
 		statusMap["process_id"] = service.processID
 		statusMap["is_enabled"], statusMap["stage"] = service.isEnabled()
@@ -293,3 +300,24 @@ func wrapSuccessMsgInJson(msg string) []byte {
 	}
 	return jsonData
 }
+
+func readAllConn(conn net.Conn) ([]byte, error) {
+	var buf bytes.Buffer
+
+	for {
+		dataChunk := make([]byte, 1024)
+
+		n, err := conn.Read(dataChunk)
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+
+		buf.Write(dataChunk[:n])
+
+		if n < 1024 {
+			break
+		}
+	}
+
+	return buf.Bytes(), nil
+}