USB mounting automatically : users option?

[Alan E. Davis]

These responses are very helpful.  It seems I am on the right track.  I did
manually assign a user a specific UID today upon creation of the user, and
that did confirm these ideas: the files are now seen as owned by any user on
the current system with that UID number.

It's a minor annoyance but it will work.  The "git" group with GID 1111 is
working ok, but I am not sure how to ensure than other users are writing
files only with group write permissions set.

Is this what a sticky bit is?

On Wed, Mar 4, 2009 at 9:26 AM, Cameron Hutchison <lists at xdna.net> wrote:

> "Alan E. Davis" <lngndvs at gmail.com> writes:
>
> >  4. in fstab:
> >        ####USB BLUE
> >        LABEL=BLUE /media/BLUE ext2 defaults,users,rw,auto 0 0
>

I am sorry to say that this experiment failed.  On this Intrepid Ibex Ubuntu
system, when I explicitly created a mount point /media/BLUE and included
this line in /etc/fstab, that partition (BLUE) ends up being mounted twice.
I am told to use "user" instead of "users".  I don't know how to set that up
for automounting.  WHen I include that line in /etc/fstab but /media/BLUE
isn't present, plugging in the USB drive throws an  error.


>              since you are using ext2, the user and group IDs are stored by
> the filesystem so there is no remapping of IDs when the volume is
> mounted.


Aha!

>
>
> The only way around this is to synchronise the IDs on the different
> machines. You can get away with using a GID in common and ensuring that
> all the files use that group ID and have group rw[x] permissions.


This is an opportunity to learn to control the permissions.

>
>
> You will probably want want to use set-gid directories and a umask of
> 00X (X is usually 2 or 7). This means the files you create are group
> writable (umask) and new files inherit the GID of the directory they are
> in (set-gid directories).


This is the big question, then: how can I set a set-gid directory?  Google
time.  In a couple of hours I can shuffle around users on the system.
Easier if it's automatic.

Thank you, very much.

Alan



-- 
Alan Davis

"An inviscid theory of flow renders the screw useless, but the need for one
non-existent."                     ---Lord Raleigh (John William Strutt), or
else his son, who was also a scientist.

It is undesirable to believe a proposition when
there is no ground whatsoever for supposing it is true.
    ---- Bertrand Russell
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20090304/3287df76/attachment.html>