Make weed-fuse compatible with systemd-based mount (#6814)

* Make weed-fuse compatible with systemd-mount series

* fix: add missing type annotation on skipAutofs param in FreeBSD build

The parameter was declared without a type, causing a compile error on FreeBSD.

* fix: guard hasAutofs nil dereference and make FsName conditional on autofs mode

- Check option.hasAutofs for nil before dereferencing to prevent panic
  when RunMount is called without the flag initialized.
- Only set FsName to "fuse" when autofs mode is active; otherwise
  preserve the descriptive server:path name for mount/df output.
- Fix typo: recogize -> recognize.

* fix: consistent error handling for autofs option and log ignored _netdev

- Replace panic with fmt.Fprintf+return false for autofs parse errors,
  matching the pattern used by other fuse option parsers.
- Log when _netdev option is silently stripped to aid debugging.

---------

Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/command/mount_linux.go

@@ -69,7 +69,7 @@ type Info struct {
 
 // Mounted determines if a specified mountpoint has been mounted.
 // On Linux it looks at /proc/self/mountinfo and on Solaris at mnttab.
-func mounted(mountPoint string) (bool, error) {
+func mounted(mountPoint string, skipAutofs bool) (bool, error) {
 	entries, err := parseMountTable()
 	if err != nil {
 		return false, err
@@ -78,6 +78,10 @@ func mounted(mountPoint string) (bool, error) {
 	// Search the table for the mountPoint
 	for _, e := range entries {
 		if e.Mountpoint == mountPoint {
+			// Check if the mountpoint is autofs
+			if skipAutofs && e.Fstype == "autofs" {
+				continue
+			}
 			return true, nil
 		}
 	}
@@ -137,13 +141,13 @@ func parseInfoFile(r io.Reader) ([]*Info, error) {
 	return out, nil
 }
 
-func checkMountPointAvailable(dir string) bool {
+func checkMountPointAvailable(dir string, skipAutofs bool) bool {
 	mountPoint := dir
 	if mountPoint != "/" && strings.HasSuffix(mountPoint, "/") {
 		mountPoint = mountPoint[0 : len(mountPoint)-1]
 	}
 
-	if mounted, err := mounted(mountPoint); err != nil || mounted {
+	if mounted, err := mounted(mountPoint, skipAutofs); err != nil || mounted {
 		if err != nil {
 			glog.Errorf("check %s: %v", mountPoint, err)
 		}