Add ready_fd service field

src/ectl/main.go

@@ -255,6 +255,7 @@ func main() {
 			serviceState := returnedJsonData["state"].(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("State: %s\n", serviceState)
@@ -263,6 +264,9 @@ func main() {
 			} else {
 				fmt.Printf("Enabled: %t\n", serviceEnabled)
 			}
+			if serviceState == "running" {
+				fmt.Printf("Process ID: %d\n", processID)
+			}
 
 			return
 		} else if flag.Arg(1) == "list" {
@@ -317,7 +321,8 @@ func main() {
 				serviceName := serviceMap.(map[string]any)["name"].(string)
 				serviceState := serviceMap.(map[string]any)["state"].(string)
 				serviceEnabled := serviceMap.(map[string]any)["is_enabled"].(bool)
-				serviceStage := serviceMap.(map[string]any)["stage"].(int)
+				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("State: %s\n", serviceState)
@@ -326,6 +331,9 @@ func main() {
 				} else {
 					fmt.Printf("Enabled: %t\n", serviceEnabled)
 				}
+				if serviceState == "running" {
+					fmt.Printf("Process ID: %d\n", processID)
+				}
 				fmt.Println()
 			}
 

src/esvm/main.go

@@ -152,10 +152,10 @@ func Init() {
 				StopCmd:         "",
 				Restart:         "",
 				CrashOnSafeExit: true,
-				ServiceRunPath:  "",
 				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()))
@@ -188,18 +188,7 @@ func Init() {
 				service.Restart = "false"
 			}
 
-			service.ServiceRunPath = path.Join(runtimeServiceDir, service.Name)
+			Services = append(Services, &service)
-			err = os.MkdirAll(path.Join(service.ServiceRunPath), 0755)
-			if err != nil {
-				logger.Fatalf("Error: could not initialize ESVM: %s", err)
-			}
-
-			err = service.setCurrentState(EnitServiceUnloaded)
-			if err != nil {
-				logger.Fatalf("Error: could not initialize ESVM: %s", err)
-			}
-
-			Services = append(Services, service)
 
 			logger.Printf("Service (%s) has been initialized!\n", service.Name)
 		}
@@ -261,7 +250,7 @@ func Destroy() {
 func GetServiceByName(name string) *EnitService {
 	for _, service := range Services {
 		if service.Name == name {
-			return &service
+			return service
 		}
 	}
 	return nil

src/esvm/service.go

@@ -2,11 +2,11 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"path"
 	"slices"
-	"strconv"
 	"strings"
 	"syscall"
 	"time"
@@ -19,6 +19,7 @@ type EnitServiceState uint8
 const (
 	EnitServiceUnknown EnitServiceState = iota
 	EnitServiceUnloaded
+	EnitServiceStarting
 	EnitServiceRunning
 	EnitServiceStopped
 	EnitServiceCrashed
@@ -28,6 +29,7 @@ const (
 var EnitServiceStateNames map[EnitServiceState]string = map[EnitServiceState]string{
 	EnitServiceUnknown:   "unknown",
 	EnitServiceUnloaded:  "unloaded",
+	EnitServiceStarting:  "starting",
 	EnitServiceRunning:   "running",
 	EnitServiceStopped:   "stopped",
 	EnitServiceCrashed:   "crashed",
@@ -44,13 +46,15 @@ type EnitService struct {
 	CrashOnSafeExit bool     `yaml:"crash_on_safe_exit"`
 	StopCmd         string   `yaml:"stop_cmd,omitempty"`
 	Restart         string   `yaml:"restart,omitempty"`
+	ReadyFd         int      `yaml:"ready_fd"`
 	LogOutput       bool     `yaml:"log_output,omitempty"`
-	ServiceRunPath  string
+	state           EnitServiceState
+	processID       int
 	restartCount    int
 	stopChannel     chan bool
 }
 
-var Services = make([]EnitService, 0)
+var Services = make([]*EnitService, 0)
 var EnabledServices = make(map[int][]string)
 var startedServicesOrder = make([]string, 0)
 
@@ -74,51 +78,11 @@ func (service *EnitService) GetUnmetDependencies() (missingDependencies []string
 }
 
 func (service *EnitService) GetProcess() *os.Process {
-	bytes, err := os.ReadFile(path.Join(service.ServiceRunPath, "process"))
+	process, _ := os.FindProcess(service.processID)
-	if err != nil {
-		return nil
-	}
-
-	pid, err := strconv.Atoi(strings.TrimSpace(string(bytes)))
-	if err != nil {
-		return nil
-	}
-
-	process, err := os.FindProcess(pid)
-	if err != nil {
-		return nil
-	}
 
 	return process
 }
 
-func (service *EnitService) setProcessID(pid int) error {
-	if err := os.WriteFile(path.Join(service.ServiceRunPath, "process"), []byte(strconv.Itoa(pid)), 0644); err != nil {
-		return err
-	}
-	return nil
-}
-
-func (service *EnitService) GetCurrentState() EnitServiceState {
-	bytes, err := os.ReadFile(path.Join(service.ServiceRunPath, "state"))
-	if err != nil {
-		return EnitServiceUnknown
-	}
-
-	state, err := strconv.Atoi(strings.TrimSpace(string(bytes)))
-	if err != nil {
-		return EnitServiceUnknown
-	}
-	return EnitServiceState(state)
-}
-
-func (service *EnitService) setCurrentState(state EnitServiceState) error {
-	if err := os.WriteFile(path.Join(service.ServiceRunPath, "state"), []byte(strconv.Itoa(int(state))), 0644); err != nil {
-		return err
-	}
-	return nil
-}
-
 func (service *EnitService) GetLogFile() (file *os.File, err error) {
 	// Create esvm log directory
 	err = os.MkdirAll("/var/log/esvm", 0755)
@@ -153,11 +117,11 @@ func (service *EnitService) GetLogFile() (file *os.File, err error) {
 	return file, nil
 }
 
-func (service *EnitService) StartService() error {
+func (service *EnitService) StartService() (err error) {
 	if service == nil {
 		return nil
 	}
-	if service.GetCurrentState() == EnitServiceRunning {
+	if service.state == EnitServiceRunning {
 		return nil
 	}
 
@@ -166,7 +130,6 @@ 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
@@ -178,6 +141,33 @@ func (service *EnitService) StartService() error {
 		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 {
@@ -187,25 +177,30 @@ func (service *EnitService) StartService() error {
 		return err
 	}
 
-	err := service.setProcessID(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()
 			}
 
-		return err
+			// Kill process
-	}
+			cmd.Process.Kill()
 
-	err = service.setCurrentState(EnitServiceRunning)
+			service.processID = 0
-	if err != nil {
+			service.state = EnitServiceCrashed
-		// Close log file if not nil
-		if logFile != nil {
-			logFile.Close()
-		}
 
 			return err
 		}
+	}
+
+	service.state = EnitServiceRunning
 
 	go func() {
 		err := cmd.Wait()
@@ -222,18 +217,18 @@ func (service *EnitService) StartService() error {
 			if service.Type == "simple" && err == nil {
 				service.restartCount = 0
 				if service.ExitMethod != "stop_command" {
-					_ = service.setCurrentState(EnitServiceCompleted)
+					service.state = EnitServiceCompleted
 				} else {
-					_ = service.setCurrentState(EnitServiceRunning)
+					service.state = EnitServiceRunning
 				}
 				return
 			}
 			if !service.CrashOnSafeExit {
 				logger.Printf("Service (%s) has exited\n", service.Name)
-				_ = service.setCurrentState(EnitServiceStopped)
+				service.state = EnitServiceStopped
 			} else {
 				logger.Printf("Service (%s) has crashed!\n", service.Name)
-				_ = service.setCurrentState(EnitServiceCrashed)
+				service.state = EnitServiceCrashed
 			}
 
 			if service.Restart == "always" {
@@ -243,6 +238,8 @@ func (service *EnitService) StartService() error {
 				_ = service.StartService()
 			}
 		}
+
+		service.processID = 0
 	}()
 
 	// Add to started services order slice
@@ -256,19 +253,20 @@ func (service *EnitService) StartService() error {
 }
 
 func (service *EnitService) StopService() error {
-	if service.GetCurrentState() != EnitServiceRunning {
+	if service.state != EnitServiceRunning {
 		return nil
 	}
 
 	logger.Printf("Stopping service (%s)...", service.Name)
 
 	newServiceStatus := EnitServiceCrashed
-	defer service.setCurrentState(newServiceStatus)
+	defer func() {
-	defer service.setProcessID(0)
+		service.state = newServiceStatus
+		service.processID = 0
+	}()
 
 	if service.ExitMethod == "kill" {
-		process := service.GetProcess()
+		if err := service.GetProcess().Signal(syscall.Signal(0)); err != nil {
-		if err := process.Signal(syscall.Signal(0)); err != nil {
 			newServiceStatus = EnitServiceStopped
 			logger.Printf("Service (%s) has stopped (Process already dead)", service.Name)
 			return nil
@@ -277,8 +275,8 @@ func (service *EnitService) StopService() error {
 		go func() { service.stopChannel <- true }()
 
 		// Send SIGTERM signal to process
-		if err := process.Signal(syscall.SIGTERM); err != nil {
+		if err := service.GetProcess().Signal(syscall.SIGTERM); err != nil {
-			process.Signal(syscall.SIGKILL)
+			service.GetProcess().Signal(syscall.SIGKILL)
 			return fmt.Errorf("could not stop process gracefully")
 		}
 
@@ -286,7 +284,7 @@ func (service *EnitService) StopService() error {
 		exited := make(chan bool)
 		go func() {
 			for {
-				if err := process.Signal(syscall.Signal(0)); err != nil {
+				if err := service.GetProcess().Signal(syscall.Signal(0)); err != nil {
 					break
 				}
 			}
@@ -296,7 +294,7 @@ func (service *EnitService) StopService() error {
 		select {
 		case <-exited:
 		case <-time.After(5 * time.Second):
-			process.Signal(syscall.SIGKILL)
+			service.GetProcess().Signal(syscall.SIGKILL)
 			return fmt.Errorf("could not stop process gracefully")
 		}
 	} else {
@@ -381,7 +379,7 @@ func ReadEnabledServices() error {
 	if err != nil {
 		// Assume old plain text format
 		for _, service := range strings.Split(strings.TrimSpace(string(data)), "\n") {
-			EnabledServices[2] = append(EnabledServices[2], service)
+			EnabledServices[3] = append(EnabledServices[3], service)
 		}
 
 		// Update enabled_services file

src/esvm/socket.go

@@ -222,7 +222,8 @@ func handleStatusServiceCommand(conn net.Conn, jsonData map[string]any) {
 
 	statusMap := make(map[string]any)
 	statusMap["name"] = service.Name
-	statusMap["state"] = EnitServiceStateNames[service.GetCurrentState()]
+	statusMap["state"] = EnitServiceStateNames[service.state]
+	statusMap["process_id"] = service.processID
 	statusMap["is_enabled"], statusMap["stage"] = service.isEnabled()
 
 	// Encode map to json string
@@ -243,7 +244,8 @@ func handleListServicesCommand(conn net.Conn, _ map[string]any) {
 	for _, service := range Services {
 		statusMap := make(map[string]any)
 		statusMap["name"] = service.Name
-		statusMap["state"] = EnitServiceStateNames[service.GetCurrentState()]
+		statusMap["state"] = EnitServiceStateNames[service.state]
+		statusMap["process_id"] = service.processID
 		statusMap["is_enabled"], statusMap["stage"] = service.isEnabled()
 		servicesMap["services"] = append(servicesMap["services"].([]map[string]any), statusMap)
 	}