[systemd-devel] automount fails but mount does not

[Simão Mata]

Yeah ok that would explain why it doesn't work..Though not sure how .mount would still have access to it if my script uses sudo.

Thanks

On Tue, Mar 14, 2023, at 13:55, Mantas Mikulėnas wrote:
> On Mon, Mar 13, 2023 at 2:34 PM Simão <freedesktop.org at 0null.xyz> wrote:
>> I have the following entry in my fstab:
>> 
>> ```
>> /home/simao/bin/encfs-mount#sync /home/simao/sync      fuse            noauto,user,owner,x-systemd.automount,allow_other     0 0
>> ```
>> 
>> This calls my encfs-mount script to mount an encfs volume. That script uses `sudo -u simao` to actually call encfs, because I want the volume to be mounted as a user.
>> 
>> Running `sudo systemctl start home-simao-sync.mount` mounts the volume correctly, and I can access it as a normal user.
>> 
>> But umounting the volume and enabling `home-simao-sync.automount` does not work, I get the following in `journalctl`:
>> 
>> ```
>> Mar 13 10:02:35 asterix sudo[476185]: pam_unix(sudo:session): session opened for user simao(uid=1000) by (uid=0)
>> Mar 13 10:02:36 asterix mount[476190]: fusermount: user has no write access to mountpoint /home/simao/sync
>> Mar 13 10:02:36 asterix mount[476188]: fuse failed.  Common problems:
>> Mar 13 10:02:36 asterix mount[476188]:  - fuse kernel module not installed (modprobe fuse)
>> Mar 13 10:02:36 asterix mount[476188]:  - invalid options -- see usage message
>> ```
>> 
>> That directory has the correct permissions, otherwise `.mount` would not work.
>> 
>> Running my script with strace, the only interesting line is:
>> 
>> ```
>> Mar 13 10:00:14 asterix mount[475558]: touch: setting times of '/home/simao/sync': Permission denied
>> ```
>> 
>> But I can touch that dir as my user.
>> 
>> Any ideas of what might be wrong?
> 
> An automount placeholder is, itself, a special kind of mount – as long as the .automount unit is active, the path is no longer owned by you because the "sync" directory has an 'autofs' filesystem mounted on top of it. (See `findmnt`.)
> 
> --
> Mantas Mikulėnas
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