Fix rights on ext4 partition with GUI applications

[Adrien.D]

Hi Gentoo users !

I have a problem.

On my computer (with MATE Desktop) I have 2 users : adrien and adeline.
I have a second hard disk (/dev/sdb1) formated with ext4.

Adrien have primary group adrien.
Adeline have primary group adeline.

Adrien and adeline are in the "nous" groupe ("nous" is in french the translation of "us" )

How can i mount my /dev/sdb1 in /media/DATA mount point to :
- adrien can create files with user adrien and group "nous"
- adeline can create files with user adeline and group "nous"
- permissions of all files are rw for user AND group to allow adrien modify files of adeline and adeline modify files of adrien (because there are in the "nous" group

I try to use guid and umask option on fstab but it works only with FAT partitions.
I try to set the permission of the mount point /media/DATA to 775 and the directory have "nous" group, but for this moment, on solution works.

Do you have an idea ?

Thanks
_________________
Desktop : MSI Gaming Pro X470 - AMD Ryzen 5 2600X - RX 560 - OpenRC GNOME - gentoo-sources-6.1 LTS
Server : Acer Barebone - Intel i3-8100T - OpenRC CLI - gentoo-sources-5.4 LTS
VMs : A lot of VMS to practice Gentoo of course (proxmox, virtualbox)

[Maitreya]

There are several ways one could approach this:

1. set-gid
2. ACL
3. inotify script
4. Samba "force user"
etc.

set-gid being the simplest imho.

[Adrien.D]

Yes, I tryed set-gid.
But if the folder created and i set the group owner to "nous", there are not with full rights (only read and not write)

I must change the umask but it's not applicable in GUI mode when files created by applications in graphical user interface.


I tested solution number 2 :

[Hu]

All processes have a umask. It is not restricted to console programs. You might have a problem finding how to set the umask in a GUI process if the author left out a dialog to set it, but unless that process actively resets the umask, you can fix this by setting the umask in the parent process before forking to create the GUI process.

[Goverp]

[Adrien.D]

I have the problem with MATE.