clean up previously mounted folder

weed/command/mount2_std.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/mount"
+	"github.com/chrislusf/seaweedfs/weed/mount/unmount"
 	"github.com/hanwen/go-fuse/v2/fs"
 	"net/http"
 	"os"
@@ -43,6 +44,12 @@ func RunMount2(option *Mount2Options, umask os.FileMode) bool {
 
 	opts := &fs.Options{}
 	opts.Debug = true
+
+	unmount.Unmount(*option.dir)
+	grace.OnInterrupt(func() {
+		unmount.Unmount(*option.dir)
+	})
+
 	server, err := fs.Mount(*option.dir, &mount.WeedFS{}, opts)
 	if err != nil {
 		glog.Fatalf("Mount fail: %v", err)

weed/mount/unmount/unmount.go

@@ -0,0 +1,6 @@
+package unmount
+
+// Unmount tries to unmount the filesystem mounted at dir.
+func Unmount(dir string) error {
+	return unmount(dir)
+}

weed/mount/unmount/unmount_linux.go

@@ -0,0 +1,21 @@
+package unmount
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+)
+
+func unmount(dir string) error {
+	cmd := exec.Command("fusermount", "-u", dir)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if len(output) > 0 {
+			output = bytes.TrimRight(output, "\n")
+			msg := err.Error() + ": " + string(output)
+			err = errors.New(msg)
+		}
+		return err
+	}
+	return nil
+}

weed/mount/unmount/unmount_std.go

@@ -0,0 +1,18 @@
+//go:build !linux
+// +build !linux
+
+package unmount
+
+import (
+	"os"
+	"syscall"
+)
+
+func unmount(dir string) error {
+	err := syscall.Unmount(dir, 0)
+	if err != nil {
+		err = &os.PathError{Op: "unmount", Path: dir, Err: err}
+		return err
+	}
+	return nil
+}