Umont ownership?
in [Debian]
|
Prev: NOW: Stay away from lshw! WAS: Retrieve hardware and modules info..
Next: horrible mc colorscheme
From: Stephen Powell on 6 Apr 2010 11:50 On Tue, 6 Apr 2010 10:23:16 -0400 (EDT), Camaleón wrote: > > Uh? So it works fine for root user... > > O.K., Let me check with my USB flash drive. After I plugg it: > > *** > sm01(a)stt008:~$ mount | grep fat > /dev/sdc1 on /media/disk type vfat (rw,nosuid,nodev,uhelper=hal,shortname=lower,uid=1000) > *** > > I try to umount it: > > *** > sm01(a)stt008:~$ umount /media/disk > *** > > And now I verify it has been "really" umounted: > > *** > sm01(a)stt008:~$ mount | grep fat > *** > > Seems to be working here for my plain user. I'll be the first to admit that I don't know much about this hotplug and GUI stuff. The closest I come to a hotplug event is to load an audio CD into my CD drive. I wait until the GNOME "Sound Juicer" application auto-launches, wait for it to display the track titles, then I close the window. I then type "cdplay" at a shell prompt to use the analog play method. I never hot-plug a USB device, not because it's evil, but because at this point I have no reason to do do. Maybe someday I'll hot-plug a USB device, just to see how it feels! ;-) But here's what I *do* know. The root user can issue mount or umount commands for any file system or mount point. A non-root user *may* be able to mount *some* file systems and *some* mount points depending on what is specified in /etc/fstab. Here is an excerpt from the man page for mount: ---------- The non-superuser mounts. Normally, only the superuser can mount filesystems. How- ever, when fstab contains the user option on a line, any- body can mount the corresponding system. Thus, given a line /dev/cdrom /cd iso9660 ro,user,noauto,unhide any user can mount the iso9660 filesystem found on his CDROM using the command mount /dev/cdrom or mount /cd For more details, see fstab(5). Only the user that mounted a filesystem can unmount it again. If any user should be able to unmount, then use users instead of user in the fstab line. The owner option is similar to the user option, with the restriction that the user must be the owner of the special file. This may be useful e.g. for /dev/fd if a login script makes the console user owner of this device. The group option is similar, with the restriction that the user must be member of the group of the special file. ---------- HTH -- .''`. Stephen Powell <zlinuxman(a)wowway.com> : :' : `. `'` `- -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/881165932.1408881270568512045.JavaMail.root(a)md01.wow.synacor.com
From: jeremy jozwik on 6 Apr 2010 12:00 On Tue, Apr 6, 2010 at 8:41 AM, Stephen Powell <zlinuxman(a)wowway.com> wrote: > A non-root user *may* be able > to mount *some* file systems and *some* mount points depending on what is > specified in /etc/fstab. Â Here is an excerpt from the man page for mount: GNU nano 2.0.7 File: /etc/fstab # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 /dev/sda1 / ext3 errors=remount-ro 0 1 /dev/sda5 none swap sw 0 0 /dev/hda /media/cdrom0 udf,iso9660 user,noauto 0 0 so, none of the media that i plug in is listed here. perhaps that is because i always use the hotplug? -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/s2kf8d5d4f31004060852pe093a738q68af1f9040c4e8da(a)mail.gmail.com
From: Stephen Powell on 6 Apr 2010 12:20 On Tue, 6 Apr 2010 11:08:55 -0400 (EDT), jeremy jozwik wrote: > > i am not familiar with those settings in linux. so i did some searching. > http://wiki.debian.org/DebianDesktopHowTo > > which says: > "This is a problem with the way D-Bus figures out what groups you are > a member of. All users should be added to plugdev, netdev, and > optionally powerdev, in /etc/groups. Any way of automating this in > Debian?" > > i look around in /etc/ and find there are 2 group files. > > mobildebian:/etc# nano group > group group- > > im guessing i need to remove group [ which is empty ] and rename > group- to be the group file. > > correct? Don't mess with /etc/group and /etc/group- ! Issue the "groups" command at a shell prompt to see which groups you are in. To add a user to a group issue the following command at the root shell prompt. adduser <user-name> <group-name> For example, adduser fred dialout To add user "fred" to the group "dialout". Fred will have to logout of *all* of his sessions on the system, including restarting the X server if he is the one who started the X server, before the change will take effect. Logon as "fred" and issue the "groups" command. If you don't see the new group, then you didn't logout of all of fred's sessions. If all else fails, reboot. That will fix it. After that, when fred issues the "groups" command, "dialout" should be listed as one of his groups. -- .''`. Stephen Powell <zlinuxman(a)wowway.com> : :' : `. `'` `- -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/2124405614.1418611270570472625.JavaMail.root(a)md01.wow.synacor.com
From: Stephen Powell on 6 Apr 2010 12:30 On Tue, 6 Apr 2010 11:52:18 -0400 (EDT), jeremy jozwik wrote: > On Tue, Apr 6, 2010 at 8:41 AM, Stephen Powell <zlinuxman(a)wowway.com> wrote: >> A non-root user *may* be able >> to mount *some* file systems and *some* mount points depending on what is >> specified in /etc/fstab.  Here is an excerpt from the man page for mount: > > GNU nano 2.0.7 File: /etc/fstab > > # /etc/fstab: static file system information. > # > # <file system> <mount point> <type> <options> <dump> <pass> > proc /proc proc defaults > 0 0 > /dev/sda1 / ext3 > errors=remount-ro 0 1 > /dev/sda5 none swap sw > 0 0 > /dev/hda /media/cdrom0 udf,iso9660 user,noauto 0 > 0 > > > so, none of the media that i plug in is listed here. perhaps that is > because i always use the hotplug? It would be interesting to see what Camaleón's /etc/fstab file looks like in comparison with yours. Camaleón, are you listening? And would you be willing to post your /etc/fstab file? -- .''`. Stephen Powell <zlinuxman(a)wowway.com> : :' : `. `'` `- -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/833218415.1421771270571145000.JavaMail.root(a)md01.wow.synacor.com
From: Camaleón on 6 Apr 2010 12:40
On Tue, 06 Apr 2010 11:41:52 -0400, Stephen Powell wrote: > On Tue, 6 Apr 2010 10:23:16 -0400 (EDT), Camaleón wrote: >> Seems to be working here for my plain user. > (...) > But here's what I *do* know. The root user can issue mount or umount > commands for any file system or mount point. A non-root user *may* be > able to mount *some* file systems and *some* mount points depending on > what is specified in /etc/fstab. Here is an excerpt from the man page > for mount: The fact is that in my "/etc/fstab" there is no entry for "udev" devices (i.e., USB flash drives) unless I manually add them. So I think these kind of devices are dynamically detected and mounted as soon as they get detected. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/pan.2010.04.06.16.30.28(a)gmail.com |