add zinit restart command

Author: Eslam-Nawara

pkg/zinit/commands.go

@@ -45,9 +45,9 @@ const (
 	ServiceStateSuccess = "success"
 	// ServiceStateError is return when we a service exit with an error (exit code != 0)
 	ServiceStateError = "error"
-	//ServiceStateFailure is set of zinit can not spawn a service in the first place
-	//due to a missing executable for example. Unlike `error` which is returned if the
-	//service itself exits with an error.
+	// ServiceStateFailure is set of zinit can not spawn a service in the first place
+	// due to a missing executable for example. Unlike `error` which is returned if the
+	// service itself exits with an error.
 	ServiceStateFailure = "failure"
 )
 
@@ -204,7 +204,6 @@ type ServiceStatus struct {
 func (c *Client) List() (out map[string]ServiceState, err error) {
 	err = c.cmd("list", &out)
 	return
-
 }
 
 // Status returns the status of a service
@@ -310,6 +309,11 @@ func (c *Client) Stop(service string) error {
 	return c.cmd(fmt.Sprintf("stop %s", service), nil)
 }
 
+// Re restarts a service.
+func (c *Client) Restart(service string) error {
+	return c.cmd(fmt.Sprintf("restart %s", service), nil)
+}
+
 // StartWait starts a service and wait until its running, or until the timeout
 // (seconds) pass. If timedout, the method returns an error if the service is not running
 // timout of 0 means no wait. (similar to Stop)

pkg/zos_api/admin.go

@@ -16,11 +16,7 @@ func (g *ZosAPI) adminRestartHandler(ctx context.Context, payload []byte) (inter
 
 	zinit := zinit.Default()
 
-	if err := zinit.Stop(service); err != nil {
-		return nil, err
-	}
-
-	return nil, zinit.Start(service)
+	return nil, zinit.Restart(service)
 }
 
 func (g *ZosAPI) adminRebootHandler(ctx context.Context, payload []byte) (interface{}, error) {