Davfs mounted with wrong options

[tigaente]

Hi,

I’m mounting a webdav share during boot using systemd. Mounting works, but the options for dir_mode and file_mode are not set correctly.

Here is my systemd-mount unit:

[Unit]
Description=mailbox.org Drive
After=network-online.target
Wants=network-online.target

[Mount]
What=https://dav.mailbox.org/servlet/webdav.infostore
Where=/mnt/mailbox.org
Options=uid=1000,gid=users,file_mode=0664,dir_mode=2775,grpid
Type=davfs
TimeoutSec=15

[Install]
WantedBy=multi-user.target

However, upon mounting, the permissions look like this:

drwxr-xr-x 2 andi root   0 22. Aug 2019   Trash
drwxr-xr-x 3 andi root   0  2. Dez 2017   Userstore

From the Options string in the systemd-unit, I would expect the permissions to look as follows:

drwxrwxr-x 2 andi users   0 22. Aug 2019   Trash
drwxrwxr-x 3 andi users   0  2. Dez 2017   Userstore

Any ideas what to do about this?

Thanks,
Andi

[xabbu]

@tigaente

gid=users

Did you tired the group ID? You used the name instead of the ID.

[tigaente]

Yes, I tried both. The result is the same, though.

[xabbu]

I used this systemd mount file. I changed my normal gid it to gid 976, just to test it.

[Unit]
Description=Mount WebDAV Service
After=network-online.target 
Wants=network-online.target 

[Mount]
What=https://...
Where=/data/webdav
Options=uid=1000,gid=976,file_mode=0664,dir_mode=2775,grpid
Type=davfs
TimeoutSec=15

[Install]
WantedBy=multi-user.target

The result is

drwxrwsr-x 12 xabbu docker 376 02.07.2021 23:25 webdav

You might want to enable debug messages in davfs to see what is going on.

for exmaple

Jul 02 23:32:30 mount.davfs[3303222]:   uid: 1000
Jul 02 23:32:30 mount.davfs[3303222]:   gid: 976
Jul 02 23:32:30 mount.davfs[3303222]:   dir_mode: 042775
Jul 02 23:32:30 mount.davfs[3303222]:   file_mode: 0100664

[tigaente]

Ok. Good suggestion to use debug mode. I enabled it it /etc/dav/davfs.conf by setting debug to most.

Here’s the relevant output:

Jul 03 11:40:31 mount.davfs[11106]: /usr/bin/mount.davfs https://dav.mailbox.org/servlet/webdav.infostore /mnt/mailbox.org -o rw,noexec,nosuid,nodev,uid=1000,user
Jul 03 11:40:31 mount.davfs[11106]: Configuration:
Jul 03 11:40:31 mount.davfs[11106]:   url: https://dav.mailbox.org/servlet/webdav.infostore
Jul 03 11:40:31 mount.davfs[11106]:   mount point: /mnt/mailbox.org
Jul 03 11:40:31 mount.davfs[11106]:   dav_user: nobody
Jul 03 11:40:31 mount.davfs[11106]:   dav_group: users
Jul 03 11:40:31 mount.davfs[11106]:   conf: (null)
Jul 03 11:40:31 mount.davfs[11106]:   user: 1
Jul 03 11:40:31 mount.davfs[11106]:   netdev: 1
Jul 03 11:40:31 mount.davfs[11106]:   grpid: 0
Jul 03 11:40:31 mount.davfs[11106]:   mopts: 0xc0ed000e
Jul 03 11:40:31 mount.davfs[11106]:   buf_size: 0 KiB
Jul 03 11:40:31 mount.davfs[11106]:   uid: 1000
Jul 03 11:40:31 mount.davfs[11106]:   gid: 0
Jul 03 11:40:31 mount.davfs[11106]:   dir_mode: 040755
Jul 03 11:40:31 mount.davfs[11106]:   file_mode: 0100644

It seems, the gid is not picked up correctly. It gives me 0 instead of 985 as configured. Also my dir_mode is not parsed correctly.

For reference, here is my current Options line from the systemd-mount-unit:

Options=uid=1000,gid=985,file_mode=0664,dir_mode=2775,grpid

[tigaente]

Ok, one more thing. When mounting manually like so:

sudo /usr/bin/mount.davfs "https://dav.mailbox.org/servlet/webdav.infostore" /mnt/mailbox.org -o rw,uid=1000,gid=985,file_mode=066
4,dir_mode=2775,grpid

it gives the following:

ls -la /mnt/
drwxrwsr-x  6 andi users  184  2. Dez 2017  mailbox.org

which is what I would expect. When mounting through systemd it mounts with the wrong options.

[tigaente]

I solved it. The problem seems to have been an old entry in /etc/fstab that I used before migrating to systemd mounting. Apparently, systemd read the contents of /etc/fstab first and automatically created a unit for that which took precedence over my own unit-file.

So, I re-did the entire unit configuration and stuff works now as expected.