> De : Philip Guenther <guent...@gmail.com> > Objet : Re: Mounting a partition, cdrom, usb as a user > > On Sat, Jun 16, 2012 at 11:43 AM, Christiano F. Haesbaert > <haesba...@openbsd.org> wrote: >> On Sat, Jun 16, 2012 at 01:48:17PM +0200, Antoine Jacoutot wrote: >>> On Sat, Jun 16, 2012 at 12:39:36PM +0100, Mik J wrote: > ... >>> > However, I'm unable to >>> > mount the partition if the owner of /mnt/extpart is root although > that mount point is rwx by the group operator and myuser belongs to that > group. >>> > # ls -l >>> > /mnt >>> > drwxrwxr-x 2 root operator 512 May 7 22:38 extpart >>> > >>> > I assume that >>> > kern.usermount allows a partition to be mounted only if the mount > point is >>> > owned by a user and the group owner is not considered. >>> > I have search for a >>> > variable kern.groupmount but there is not such thing. >>> > >>> > So my question is: >>> > Is it possible to allow a group to mount partitions (or usb keys, > cdrom) ? >>> >>> Man mount(8). >>> " Only the superuser may >>> mount file systems unless kern.usermount is nonzero (see sysctl(8)), > the >>> special device is readable and writeable by the user attempting the >>> mount, and the mount point node is owned by the user attempting the >>> mount." >> >> Any special reason why not respecting groups ? >> This feels like a strange behaviour. > > It's not obvious to me that it's safe. For example, you would also > need a !(mode & S_ISTXT) test. Should sys_unmount let other users in > the group unmount it? Stacking of mounts by different users in the > same group? > > Lacking any info about what problem this is supposed to be a solution > to, my response to the original question is > "Have each user mount somewhere they own and use a symlink" > > > Philip Guenther
Thank you all for your answers. Of course Antoine, I checked the man before asking the question. But the man is clear about mount about mounting a device as a user and not saying anything about groups. Philip, regarding the stacking of mounts I have tried to mount as root the same partition twice, on /mnt/mount1 and /mnt/mount2. The system told me "mount_ffs: /dev/wd0a on /mnt/mount2: Device busy". I would expect the same behavior if two users are trying to mount the same device. I use sudo for other things but it didn't come to my mind.
