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external USB hard drive mount permissions

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  external USB hard drive mount permissions Federico Beffa <beffa@ieee.org> - 2017-09-02 14:50 +0200
    Re: external USB hard drive mount permissions Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2017-09-02 15:10 +0200
      Re: external USB hard drive mount permissions "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-09-04 17:50 +0200
    Re: external USB hard drive mount permissions Federico Beffa <beffa@fbengineering.ch> - 2017-09-02 15:10 +0200

#186297 — external USB hard drive mount permissions

Hi,

I'm using Debian Stretch with Gnome. When I plug-in an external USB
hard drive (ext4) it gets automatically mounted at /media/beffa/label.
However, the drive is read-only for the user owning the Gnome shell
(beffa). I've tried adding default ACL entries to /media/beffa as
follows

# file: .
# owner: root
# group: root
user::rwx
user:beffa:rwx
group::r-x
mask::rwx
other::r-x
default:user::rwx
default:user:beffa:rwx
default:group::r-x
default:mask::rwx
default:other::r-x

but the device is still only writable by root.

How can I tell the system to make it writable for the user owning the
Gnome session or even everybody?

Thanks for your help!
Fede

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#186298

On 02-09-2017 09:29, Federico Beffa wrote:
> I'm using Debian Stretch with Gnome. When I plug-in an external USB
> hard drive (ext4) it gets automatically mounted at /media/beffa/label.
>
>
> but the device is still only writable by root.
>
> How can I tell the system to make it writable for the user owning the
> Gnome session

I don't think you can. The permissions are the permissions of the root
directory of the filesystem in the drive (which get mapped to
/media/beffa/label), and have nothing to do with the mount point.

>  or even everybody?

That's possible, just chmod 777 /media/beffa/label.

Or use a permission-less filesystem such as vfat.

-- 
Duct tape is like the force.  It has a light side, and a dark side, and
it holds the universe together ...
		-- Carl Zwanzig

Eduardo M KALINOWSKI
eduardo@kalinowski.com.br

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#186438

On 9/2/17, 6:01 AM, Eduardo M KALINOWSKI wrote:
> On 02-09-2017 09:29, Federico Beffa wrote:
>> I'm using Debian Stretch with Gnome. When I plug-in an external USB
>> hard drive (ext4) it gets automatically mounted at /media/beffa/label.
>>
>>
>> but the device is still only writable by root.
>>
>> How can I tell the system to make it writable for the user owning the
>> Gnome session

You might also consider adding an FSTAB entry, using a "LABEL=" 
drive-ID, to map it to a mount point of your own choosing.

That's what I ended up doing.

--
JHHL

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#186299

Federico Beffa <beffa@ieee.org> writes:

> Hi,
>
> I'm using Debian Stretch with Gnome. When I plug-in an external USB
> hard drive (ext4) it gets automatically mounted at /media/beffa/label.
> However, the drive is read-only for the user owning the Gnome shell
> (beffa). I've tried adding default ACL entries to /media/beffa as
> follows
>
> # file: .
> # owner: root
> # group: root
> user::rwx
> user:beffa:rwx
> group::r-x
> mask::rwx
> other::r-x
> default:user::rwx
> default:user:beffa:rwx
> default:group::r-x
> default:mask::rwx
> default:other::r-x
>
> but the device is still only writable by root.
>
> How can I tell the system to make it writable for the user owning the
> Gnome session or even everybody?

I'm just stupid! I just had to change permissions on the USB drive
filesystem :-)

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