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Armand Karlsen
n00b
Joined: 18 Aug 2005
Posts: 59
Location: London, UK
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 Posted: Wed Oct 09, 2024 9:01 pm Post subject: Attempting to mount external hard drive clobbers permissions |
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I have an external hard drive formatted to XFS that I intend to use as an occasionally-connected offline backup and I want the normal user on my machine to be able to mount and write to it, for convenience.
I created the directory inside /mnt, then used chown and chmod to give ownership and full permissions to the user, and ls -l shows as such: | Code: | | drwxrwxrwx 2 armand armand 6 Oct 9 21:27 extbak |
The mountpoint is listed in /etc/fstab for read-write, allow non-root to mount: | Code: | | PARTUUID=5916f543-8185-4d1a-8d6d-6e62246cc0a1 /mnt/extbak xfs noauto,rw,user 0 0 |
However, when I actually mount the drive, ownership and permissions get clobbered back to root, and it's turned read-only for everyone else: | Code: | | drwxr-xr-x 2 root root 6 Oct 9 20:42 extbak |
Am I missing something really basic here, or how do I give the regular user read-write access to the drive? |
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grknight
Retired Dev
Joined: 20 Feb 2015
Posts: 1961
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| Posted: Wed Oct 09, 2024 10:37 pm Post subject: |
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| Armand Karlsen wrote: | | Am I missing something really basic here, or how do I give the regular user read-write access to the drive? |
Change the permissions once mounted as it shows owners from the external drive's root after the mount. |
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Armand Karlsen
n00b
Joined: 18 Aug 2005
Posts: 59
Location: London, UK
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| Posted: Thu Oct 10, 2024 11:10 am Post subject: |
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| grknight wrote: | | Armand Karlsen wrote: | | Am I missing something really basic here, or how do I give the regular user read-write access to the drive? |
Change the permissions once mounted as it shows owners from the external drive's root after the mount. |
Thanks, I'll give that a go  . Is there a way to make that stick so I don't have to do that every time? |
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Banana
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Joined: 21 May 2004
Posts: 1799
Location: Germany
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sabayonino
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Joined: 03 Jan 2012
Posts: 1041
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| Posted: Thu Oct 10, 2024 12:11 pm Post subject: |
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Hi .
try to change from
to
mount options
look at
| Quote: | user
Allow an ordinary user to mount the filesystem. The name of the mounting user is written to the mtab file (or to the private libmount file in /run/mount on
systems without a regular mtab) so that this same user can unmount the filesystem again. This option implies the options noexec, nosuid, and nodev (unless
overridden by subsequent options, as in the option line user,exec,dev,suid).
users
Allow any user to mount and to unmount the filesystem, even when some other ordinary user mounted it. This option implies the options noexec, nosuid, and
nodev (unless overridden by subsequent options, as in the option line users,exec,dev,suid).
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change the permissions/owner to the root of the device filesystem (e.g.: /mnt/usb)
_________________
LRS 64/32 |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22867
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| Posted: Thu Oct 10, 2024 5:38 pm Post subject: |
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| Armand Karlsen wrote: | | Am I missing something really basic here, or how do I give the regular user read-write access to the drive? |
Yes, you are missing the basic rules for how mounts work. You changed the permissions on the directory named mnt/extbak on the filesystem / (to a very insecure setting, incidentally). You then mounted a new filesystem over that directory, hiding it and all its contents. The permissions of the root of the new filesystem are the secure standard of root:root 755. The permissions on the directory mnt/extbak on / were not clobbered. They are merely hidden until you unmount.
Even with the solution given to you here, that will not allow your unprivileged user armand to create files owned as users other than armand, so some types of backup will not be possible. | sabayonino wrote: | try to change from
to |
This is not relevant here. Your proposal only matters if OP wants multiple non-root users to be able to manage the mount status of the drive. |
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