Make sure cleanup is executed before exiting

Closes #708

src/cmds/restic/cleanup.go

@@ -62,8 +62,13 @@ func CleanupHandler(c <-chan os.Signal) {
 	for s := range c {
 		debug.Log("signal %v received, cleaning up", s)
 		fmt.Printf("%sInterrupt received, cleaning up\n", ClearLine())
-		RunCleanupHandlers()
-		fmt.Println("exiting")
-		os.Exit(0)
+		Exit(0)
 	}
 }
+
+// Exit runs the cleanup handlers and then terminates the process with the
+// given exit code.
+func Exit(code int) {
+	RunCleanupHandlers()
+	os.Exit(code)
+}

src/cmds/restic/global.go

@@ -131,7 +131,7 @@ func Printf(format string, args ...interface{}) {
 	_, err := fmt.Fprintf(globalOptions.stdout, format, args...)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "unable to write to stdout: %v\n", err)
-		os.Exit(100)
+		Exit(100)
 	}
 }
 
@@ -174,18 +174,19 @@ func Warnf(format string, args ...interface{}) {
 	_, err := fmt.Fprintf(globalOptions.stderr, format, args...)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "unable to write to stderr: %v\n", err)
-		os.Exit(100)
+		Exit(100)
 	}
 }
 
-// Exitf uses Warnf to write the message and then calls os.Exit(exitcode).
+// Exitf uses Warnf to write the message and then terminates the process with
+// the given exit code.
 func Exitf(exitcode int, format string, args ...interface{}) {
 	if format[len(format)-1] != '\n' {
 		format += "\n"
 	}
 
 	Warnf(format, args...)
-	os.Exit(exitcode)
+	Exit(exitcode)
 }
 
 // readPassword reads the password from the given reader directly.

src/cmds/restic/lock.go

@@ -36,6 +36,7 @@ func lockRepository(repo *repository.Repository, exclusive bool) (*restic.Lock,
 	if err != nil {
 		return nil, err
 	}
+	debug.Log("create lock %p (exclusive %v)", lock, exclusive)
 
 	globalLocks.Lock()
 	if globalLocks.cancelRefresh == nil {
@@ -88,7 +89,7 @@ func unlockRepo(lock *restic.Lock) error {
 	globalLocks.Lock()
 	defer globalLocks.Unlock()
 
-	debug.Log("unlocking repository")
+	debug.Log("unlocking repository with lock %p", lock)
 	if err := lock.Unlock(); err != nil {
 		debug.Log("error while unlocking: %v", err)
 		return err

src/cmds/restic/main.go

@@ -49,9 +49,10 @@ func main() {
 		fmt.Fprintf(os.Stderr, "%+v\n", err)
 	}
 
-	RunCleanupHandlers()
-
+	var exitCode int
 	if err != nil {
-		os.Exit(1)
+		exitCode = 1
 	}
+
+	Exit(exitCode)
 }