Monday, December 22, 2025

automount of SMB share on MacOS Sequoia gets ‘Operation not permitted’

I am attempting to get automount for an SMB share working on macOS Sequoia 15.7.3. However, this is getting an “Operation not permitted” error when attempting to access the mount point. Does anyone have suggestions on how to address this issue?

% ls /mnt/music-library/shelf/
ls: /mnt/music-library/shelf/: Operation not permitted
% sudo ls /mnt/music-library/shelf/
ls: /mnt/music-library/shelf/: Operation not permitted

Configuration

SIP is disabled:

% csrutil status                                                                        
System Integrity Protection status: disabled.

The mount can be done manually:

% mount_smbfs -d 0555 -f 0444 //music:[email protected]/shelf /tmp/test/

/etc/auto_master:

+auto_master        # Use directory service
/-          -static
/-          auto_shares    -nosuid,noowners

/etc/auto_shares:

/System/Volumes/Data/mnt/music-library/shelf -fstype=smbfs,credentials=/etc/smb_music_credentials,file_mode=0444,dir_mode=0555 ://osprey.local/shelf

automount:

% sudo automount -vc                                                         
automount: /System/Volumes/Data/mnt/music-library/shelf updated                     
automount: no unmounts   

Full Disk Access granted to:

  • Terminal
  • /usr/libexec/automountd
  • /usr/libexec/autofsd
  • /usr/sbin/automount

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