[SOLVED] Bind mount to reflect Samba mount owner/permissions?

[jonathanku]

I have a few containers running on Proxmox and have a challenge with a Bind mount vs a Samba share.

Container 101 has a directory shared via Samba (it's effectively my NAS). Anything written to it via Samba adopts file ownership & permissions determined by the samba process / config.

That same directory is also mounted via a bind mount (set up from the PVE host) by another container - container 102, because I can't get it to mount via CIFS / samba - but any files written via this bind mount have different ownership and permissions.

I thought about having a cron job to chown + chmod such files, but that seems very messy. Is there a good way to force files coming in via that bind mount to assume the desired ownership / permissions - i.e. same as how Samba files appear?

 

[jonathanku]

I've tried the following:

mount -o umask=755,gid=500,uid=500 --bind /var/lib/vz/private/101/var/NAS /var/lib/vz/root/106/m
nt/nas/

(following an example from here/Superuser.com)

The mount works, but the umask, gid and uid seem to have no effect. When in container 106, any new files are still created as root:root.

Edited to add: 500:500 is the NAS user - so any files written via samba to the directory have that ownership.

 

[jonathanku]

Found a solution... maybe it was obvious, but not to me initially...

In the container where I'm using this bind mount, I run as a new user with the same UID/GID as the NAS user from the NAS container -- i.e. 500:500. The files then get written with the same ownership as those writte