cmd: refactor and use sysdnotify in more commands

* cmd: refactor and use sysdnotify in more commands

Fixes #5117

cmd/rcd/rcd.go

@@ -4,14 +4,12 @@ package rcd
 import (
 	"context"
 	"log"
-	"sync"
 
-	sysdnotify "github.com/iguanesolutions/go-systemd/v5/notify"
 	"github.com/rclone/rclone/cmd"
 	"github.com/rclone/rclone/fs/rc/rcflags"
 	"github.com/rclone/rclone/fs/rc/rcserver"
-	"github.com/rclone/rclone/lib/atexit"
 	libhttp "github.com/rclone/rclone/lib/http"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/spf13/cobra"
 )
 
@@ -58,21 +56,8 @@ See the [rc documentation](/rc/) for more info on the rc flags.
 		}
 
 		// Notify stopping on exit
-		var finaliseOnce sync.Once
-		finalise := func() {
-			finaliseOnce.Do(func() {
-				_ = sysdnotify.Stopping()
-			})
-		}
-		fnHandle := atexit.Register(finalise)
-		defer atexit.Unregister(fnHandle)
-
-		// Notify ready to systemd
-		if err := sysdnotify.Ready(); err != nil {
-			log.Fatalf("failed to notify ready to systemd: %v", err)
-		}
+		defer systemd.Notify()()
 
 		s.Wait()
-		finalise()
 	},
 }

cmd/serve/dlna/dlna.go

@@ -22,6 +22,7 @@ import (
 	"github.com/rclone/rclone/cmd/serve/dlna/data"
 	"github.com/rclone/rclone/cmd/serve/dlna/dlnaflags"
 	"github.com/rclone/rclone/fs"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/vfs"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"github.com/spf13/cobra"
@@ -64,6 +65,7 @@ files that they are not able to play back correctly.
 			if err := s.Serve(); err != nil {
 				return err
 			}
+			defer systemd.Notify()()
 			s.Wait()
 			return nil
 		})

cmd/serve/http/http.go

@@ -22,6 +22,7 @@ import (
 	"github.com/rclone/rclone/fs/accounting"
 	libhttp "github.com/rclone/rclone/lib/http"
 	"github.com/rclone/rclone/lib/http/serve"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/vfs"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"github.com/spf13/cobra"
@@ -92,6 +93,7 @@ control the stats printing.
 				log.Fatal(err)
 			}
 
+			defer systemd.Notify()()
 			s.server.Wait()
 			return nil
 		})

cmd/serve/restic/restic.go

@@ -13,8 +13,6 @@ import (
 	"strings"
 	"time"
 
-	sysdnotify "github.com/iguanesolutions/go-systemd/v5/notify"
-
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 	"github.com/rclone/rclone/cmd"
@@ -25,6 +23,7 @@ import (
 	"github.com/rclone/rclone/fs/walk"
 	libhttp "github.com/rclone/rclone/lib/http"
 	"github.com/rclone/rclone/lib/http/serve"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/lib/terminal"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/http2"
@@ -180,16 +179,9 @@ with a path of ` + "`/<username>/`" + `.
 			}
 			fs.Logf(s.f, "Serving restic REST API on %s", s.URLs())
 
-			if err := sysdnotify.Ready(); err != nil {
-				fs.Logf(s.f, "failed to notify ready to systemd: %v", err)
-			}
-
+			defer systemd.Notify()()
 			s.Wait()
 
-			if err := sysdnotify.Stopping(); err != nil {
-				fs.Logf(s.f, "failed to notify stopping to systemd: %v", err)
-			}
-
 			return nil
 		})
 	},

cmd/serve/sftp/sftp.go

@@ -13,6 +13,7 @@ import (
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config/flags"
 	"github.com/rclone/rclone/fs/rc"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/vfs"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"github.com/spf13/cobra"
@@ -135,6 +136,7 @@ provided by OpenSSH in this case.
 			if err != nil {
 				return err
 			}
+			defer systemd.Notify()()
 			s.Wait()
 			return nil
 		})

cmd/serve/webdav/webdav.go

@@ -24,6 +24,7 @@ import (
 	"github.com/rclone/rclone/fs/hash"
 	libhttp "github.com/rclone/rclone/lib/http"
 	"github.com/rclone/rclone/lib/http/serve"
+	"github.com/rclone/rclone/lib/systemd"
 	"github.com/rclone/rclone/vfs"
 	"github.com/rclone/rclone/vfs/vfsflags"
 	"github.com/spf13/cobra"
@@ -145,6 +146,7 @@ https://learn.microsoft.com/en-us/office/troubleshoot/powerpoint/office-opens-bl
 			if err != nil {
 				return err
 			}
+			defer systemd.Notify()()
 			s.Wait()
 			return nil
 		})

lib/systemd/doc.go

@@ -0,0 +1,2 @@
+// Package systemd contains utilities for communication with the systemd service manager.
+package systemd

lib/systemd/notify.go

@@ -0,0 +1,32 @@
+package systemd
+
+import (
+	"log"
+	"sync"
+
+	sysdnotify "github.com/iguanesolutions/go-systemd/v5/notify"
+	"github.com/rclone/rclone/lib/atexit"
+)
+
+// Notify systemd that the service is starting. This returns a
+// function which should be called to notify that the service is
+// stopping. This function will be called on exit if the service exits
+// on a signal.
+func Notify() func() {
+	if err := sysdnotify.Ready(); err != nil {
+		log.Printf("failed to notify ready to systemd: %v", err)
+	}
+	var finaliseOnce sync.Once
+	finalise := func() {
+		finaliseOnce.Do(func() {
+			if err := sysdnotify.Stopping(); err != nil {
+				log.Printf("failed to notify stopping to systemd: %v", err)
+			}
+		})
+	}
+	finaliseHandle := atexit.Register(finalise)
+	return func() {
+		atexit.Unregister(finaliseHandle)
+		finalise()
+	}
+}