Merge pull request #12 from Sheile/feature/dependencies

Add dependencies option

README.md

@@ -19,7 +19,7 @@ import (
 )
 
 func main() {
-	service, err := daemon.New("name", "description")
+	service, err := daemon.New("name", "description", []string{})
 	if err != nil {
 		log.Fatal("Error: ", err)
 	}
@@ -57,6 +57,9 @@ const (
 	port = ":9977"
 )
 
+//	dependencies that are required by the service
+var dependencies = []string{"dummy.service"}
+
 var stdlog, errlog *log.Logger
 
 // Service has embedded daemon
@@ -155,7 +158,7 @@ func init() {
 }
 
 func main() {
-	srv, err := daemon.New(name, description)
+	srv, err := daemon.New(name, description, dependencies)
 	if err != nil {
 		errlog.Println("Error: ", err)
 		os.Exit(1)

daemon.go

@@ -36,6 +36,9 @@ Example:
 		port = ":9977"
 	)
 
+  //	dependencies that are required by the service
+  var dependencies = []string{"dummy.service"}
+
 	var stdlog, errlog *log.Logger
 
 	// Service has embedded daemon
@@ -134,7 +137,7 @@ Example:
 	}
 
 	func main() {
-		srv, err := daemon.New(name, description)
+		srv, err := daemon.New(name, description, dependencies)
 		if err != nil {
 			errlog.Println("Error: ", err)
 			os.Exit(1)
@@ -177,6 +180,6 @@ type Daemon interface {
 //
 // name: name of the service
 // description: any explanation, what is the service, its purpose
-func New(name, description string) (Daemon, error) {
-	return newDaemon(strings.Join(strings.Fields(name), "_"), description)
+func New(name, description string, dependencies []string) (Daemon, error) {
+	return newDaemon(strings.Join(strings.Fields(name), "_"), description, dependencies)
 }

daemon_darwin.go

@@ -16,13 +16,14 @@ import (
 
 // darwinRecord - standard record (struct) for darwin version of daemon package
 type darwinRecord struct {
-	name        string
-	description string
+	name         string
+	description  string
+	dependencies []string
 }
 
-func newDaemon(name, description string) (Daemon, error) {
+func newDaemon(name, description string, dependencies []string) (Daemon, error) {
 
-	return &darwinRecord{name, description}, nil
+	return &darwinRecord{name, description, dependencies}, nil
 }
 
 // Standard service path for system daemons

daemon_linux.go

@@ -10,11 +10,11 @@ import (
 )
 
 // Get the daemon properly
-func newDaemon(name, description string) (Daemon, error) {
+func newDaemon(name, description string, dependencies []string) (Daemon, error) {
 	if _, err := os.Stat("/run/systemd/system"); err == nil {
-		return &systemDRecord{name, description}, nil
+		return &systemDRecord{name, description, dependencies}, nil
 	}
-	return &systemVRecord{name, description}, nil
+	return &systemVRecord{name, description, dependencies}, nil
 }
 
 // Get executable path

daemon_linux_systemd.go

@@ -9,13 +9,15 @@ import (
 	"os"
 	"os/exec"
 	"regexp"
+	"strings"
 	"text/template"
 )
 
 // systemDRecord - standard record (struct) for linux systemD version of daemon package
 type systemDRecord struct {
-	name        string
-	description string
+	name         string
+	description  string
+	dependencies []string
 }
 
 // Standard service path for systemD daemons
@@ -83,8 +85,8 @@ func (linux *systemDRecord) Install() (string, error) {
 	if err := templ.Execute(
 		file,
 		&struct {
-			Name, Description, Path string
-		}{linux.name, linux.description, execPatch},
+			Name, Description, Dependencies, Path string
+		}{linux.name, linux.description, strings.Join(linux.dependencies, " "), execPatch},
 	); err != nil {
 		return installAction + failed, err
 	}
@@ -187,6 +189,8 @@ func (linux *systemDRecord) Status() (string, error) {
 
 var systemDConfig = `[Unit]
 Description={{.Description}}
+Requires={{.Dependencies}}
+After={{.Dependencies}}
 
 [Service]
 PIDFile=/var/run/{{.Name}}.pid

daemon_linux_systemv.go

@@ -14,8 +14,9 @@ import (
 
 // systemVRecord - standard record (struct) for linux systemV version of daemon package
 type systemVRecord struct {
-	name        string
-	description string
+	name         string
+	description  string
+	dependencies []string
 }
 
 // Standard service path for systemV daemons

daemon_windows.go

@@ -11,13 +11,14 @@ import (
 
 // windowsRecord - standard record (struct) for windows version of daemon package
 type windowsRecord struct {
-	name        string
-	description string
+	name         string
+	description  string
+	dependencies []string
 }
 
-func newDaemon(name, description string) (Daemon, error) {
+func newDaemon(name, description string, dependencies []string) (Daemon, error) {
 
-	return &windowsRecord{name, description}, nil
+	return &windowsRecord{name, description, dependencies}, nil
 }
 
 // Install the service

example/myservice.go

@@ -22,6 +22,9 @@ const (
 	port = ":9977"
 )
 
+//	dependencies that are required by the service
+var dependencies = []string{"dummy.service"}
+
 var stdlog, errlog *log.Logger
 
 // Service has embedded daemon
@@ -120,7 +123,7 @@ func init() {
 }
 
 func main() {
-	srv, err := daemon.New(name, description)
+	srv, err := daemon.New(name, description, dependencies)
 	if err != nil {
 		errlog.Println("Error: ", err)
 		os.Exit(1)