service: add pidfile option

service.go

@@ -81,6 +81,7 @@ const (
 
 	optionRunWait      = "RunWait"
 	optionReloadSignal = "ReloadSignal"
+	optionPIDFile      = "PIDFile"
 )
 
 // Config provides the setup for a Service. The Name field is required.
@@ -112,6 +113,7 @@ type Config struct {
 	//  * POSIX
 	//    - RunWait      func() (wait for SIGNAL) - Do not install signal but wait for this function to return.
 	//    - ReloadSignal string () [USR1, ...] - Signal to send on reaload.
+	//    - PIDFile     string () [/run/prog.pid] - Location of the PID file.
 	Option KeyValue
 }
 

service_systemd_linux.go

@@ -81,10 +81,12 @@ func (s *systemd) Install() error {
 		*Config
 		Path string
 		ReloadSignal string
+		PIDFile string
 	}{
 		s.Config,
 		path,
 		s.Option.string(optionReloadSignal, ""),
+		s.Option.string(optionPIDFile, ""),
 	}
 
 	err = s.template().Execute(f, to)
@@ -163,6 +165,7 @@ ExecStart={{.Path|cmdEscape}}{{range .Arguments}} {{.|cmd}}{{end}}
 {{if .WorkingDirectory}}WorkingDirectory={{.WorkingDirectory|cmd}}{{end}}
 {{if .UserName}}User={{.UserName}}{{end}}
 {{if .ReloadSignal}}ExecReload=/bin/kill -{{.ReloadSignal}} "$MAINPID"{{end}}
+{{if .PIDFile}}PIDFile={{.PIDFile|cmd}}{{end}}
 Restart=always
 RestartSec=120