[SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

shefla · 2010-03-05 00:37:56

SOLUTION SUMMARY:

- Using gdm
GDM will grant you necessary rights when logging

- Without using GDM
The following line must be in your .xinit.rc file
exec ck-launch-session gnome-session
The "ck-launch-session" command will grant you necessary rights

For more explanation regarding "ck-launch-session" command, follow this link :
http://www.freedesktop.org/wiki/Software/ConsoleKit

------------------------------------------------------------------

Hi,

Please find below a description of my problem with UDEV and unmounting usb drive.

Explanation

I have added a rule to UDEV in order to have my USB drive automounted when I plug it.
The auto mount work fine from a normal user session.

The problem is : I am unable to unmount my usb drive from a normal user session.

In Gnome with a normal user, right click on the drive then "Unmount"
--> Unable to unmount 4.0 GB Filesystem
Not Authorized

In Gnome with a normal user, right click on the drive then "Eject"
--> Unable to eject 4.0 GB Filesystem
Failed to eject media; one or more volumes on the media are busy.

In Gnome with a normal user, right click on the drive then "Safely Remove Drive"
--> Unable to stop drive
Failed to eject media; one or more volumes on the media are busy.

In Gnome with the "Disk Utility" tool with a normal user
--> Error unmounting device
Permission denied.
Not Authorized

In a terminal with a normal user, "umount /dev/sdb1"
--> umount: /dev/sdb1 is not in the fstab (and you are not root)

If I execute the above command as root, it is working fine, my drive is properly unmounted.

Some information

uname -a --> Linux myhost 2.6.32-ARCH #1 SMP PREEMPT Tue Feb 23 19:24:08 UTC 2010 i686 Intel(R) Pentium(R) D CPU 2.80GHz GenuineIntel GNU/Linux

Gnome 2.28.2

udevd --version --> 151

lsusb --> Bus 002 Device 004: ID 054c:0243 Sony Corp. MicroVault Flash Drive

mount --> /dev/sdb1 on /media/usbhd-sdb1 type vfat (rw,noexec,nosuid,nodev,noatime,utf8,gid=100,umask=002)

grep shefla /etc/group --> lp:x:7:daemon,shefla
video:x:91:shefla
audio:x:92:shefla
optical:x:93:shefla,hal
storage:x:95:shefla,hal
power:x:98:shefla

"/etc/udev/rules.d/11-media-by-label-auto-mount.rules" file I have created for automount.
KERNEL!="sd[a-z]*", GOTO="media_by_label_auto_mount_end"
ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="media_by_label_auto_mount_end"

# Open luks partition if necessary
PROGRAM=="/sbin/blkid -o value -s TYPE %N", RESULT=="crypto_LUKS", ENV{crypto}="mapper/", ENV{device}="/dev/mapper/%k"
ENV{crypto}!="?*", ENV{device}="%N"
ACTION=="add", ENV{crypto}=="?*", PROGRAM=="/usr/bin/xterm -display :0.0 -e 'echo Password for /dev/%k; /usr/sbin/cryptsetup luksOpen %N %k'"
=="add", ENV{crypto}=="?*", TEST!="/dev/mapper/%k", GOTO="media_by_label_auto_mount_end"

# Global mount options
ACTION=="add", ENV{mount_options}="noatime,users"
# Filesystem specific options
ACTION=="add", PROGRAM=="/sbin/blkid -o value -s TYPE %E{device}", RESULT=="vfat|ntfs", ENV{mount_options}="%E{mount_options},utf8,gid=100,umask=002"

# Get label
ACTION=="add", PROGRAM=="/sbin/blkid -o value -s LABEL %E{device}", ENV{dir_name}="%c"
# use basename to correctly handle labels such as ../mnt/foo
ACTION=="add", PROGRAM=="/usr/bin/basename '%E{dir_name}'", ENV{dir_name}="%c"
ACTION=="add", ENV{dir_name}!="?*", ENV{dir_name}="usbhd-%k"

ACTION=="add", ENV{dir_name}=="?*", RUN+="/bin/mkdir -p '/media/%E{dir_name}'", RUN+="/bin/mount -o %E{mount_options} /dev/%E{crypto}%k '/media/%E{dir_name}'"
ACTION=="remove", ENV{dir_name}=="?*", RUN+="/bin/umount -l '/media/%E{dir_name}'", RUN+="/bin/rmdir '/media/%E{dir_name}'"
ACTION=="remove", ENV{crypto}=="?*", RUN+="/usr/sbin/cryptsetup luksClose %k"
LABEL="media_by_label_auto_mount_end"

Question

Thanks you for having read this explanation.

Could you please let me know how a normal user can unmount an usb driver automatically mounted by udev ?
Do you think there is a way to unmount it for gnome (graphical way) ?

Thanks

Shefla

Last edited by shefla (2010-03-15 18:01:00)

gladstone · 2010-03-11 13:40:55

Or put another way...

Can udev mount as user?

Painless · 2010-03-11 17:18:42

Out of interest, what is the output from:

ls -l /dev/sdb1

and

ls -l /media

?

gladstone · 2010-03-11 19:11:08

$ ls -l /media
drwxrwxr-x 12 root users  16K Jan  1  1970 CENTRIOS

$ ls -l /dev/sdb1 
brw-rw---- 1 root disk 8, 17 Mar 11 19:07 /dev/sdb1

$ groups
tty disk wheel cron video audio optical storage camera users vboxusers

Relevant thread: Udev still recommended?, of which I (and probably the OP) use this Udev rule.

fabertawe · 2010-03-12 10:06:27

Something odd's recently happened here...

I started using a Udev rule as I couldn't get any joy with USB drives under Gnome. The other day I started fiddling with it to see if I could fix the unable to unmount as you're not root problem and ended up commenting the whole thing out. Now USB mounting/unmounting works perfectly!

Can anyone explain that?!

Painless · 2010-03-12 15:28:54

Well I was actually asking shefla, but never mind. I can unmount USB drives without any problems, so FWIW here is my output:

$ df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
...
udev                     10240       276      9964   3% /dev
...
/dev/sdb1              1968636   1542020    426616  79% /media/5D6F-2040

$ ls -l /dev/sdb1
brw-rw---- 1 root storage 8, 17 Mar 12 15:24 /dev/sdb1

$ ls -l /media
...
drwx------ 5 rob  rob  4096 Jan  1  1970 5D6F-2040

anonymous_user · 2010-03-12 16:47:39

Im having the same problem but with Thunar. The message it gives when trying to unmount is "The volume "Linux" was probably mounted manually on the command line."

$ ls -l /media
...
drwxr-xr-x 11 kevin kevin 4096 Jan 30 10:02 Linux
drwxrwxr-x  1 root  users 4096 Mar 12 08:44 Windows

shefla · 2010-03-13 01:16:40

Hi Painless, Hi everybody,

Sorry to haven't answered yet, my job didn't let me a lot of free time.
This weekend I have more time to look at this issue.

Please find below requested info.

[shefla@myhost ~]$ ls -l /dev/sdb1
brw-rw---- 1 root disk 8, 17 Mar 13 02:02 /dev/sdb1

[shefla@myhost ~]$ ls -l /media
total 16
drwxr-xr-x 2 root root  4096 Feb 26 05:56 cd
drwxr-xr-x 2 root root  4096 Feb 26 05:56 dvd
drwxr-xr-x 2 root root  4096 Feb 26 05:56 fl
drwxrwxr-x 5 root users 4096 Mar 13 02:03 usbhd-sdb1

[shefla@myhost ~]$ groups
lp video audio optical storage scanner power users

[shefla@myhost ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
...
udev                   10M  452K  9.6M   5% /dev
...
/dev/sdb1             3.8G  525M  3.3G  14% /media/usbhd-sdb1

When I log through GDM then the problem does not exists anymore. Everything is fine.
It seem GDM "automatically give some rights" for the session.

When I am not using GDM (I directly start gnome-session), then I am unable to mount or unmount flash drive.
To be able to do it, I have to add the above udev rule file.

Do somebody know which rights / permissions / ... are granted by gdm when logging ?

Thanks and regards

Last edited by shefla (2010-03-15 17:27:35)

Painless · 2010-03-13 20:53:27

How do you start gnome-session from startx/.xinitrc? Try using:

exec ck-launch-session gnome-session

shefla · 2010-03-14 02:40:00

Hi Painless,

I was using

exec gnome-session

I have tested with

exec ck-launch-session gnome-session

It works great.

I feel a little bit stupid when I see a so simple answer ...
Anyway thanks.

2 last questions before closing this topic :
What does the "ck-launch-session" do exactly ?
Could this be risky from a security point of view ? (I think it is not more risky than using gdm, I just want to confirm this)

Thanks for your help

Regards

Shefla

Painless · 2010-03-15 16:58:57

"ck-launch-session" is part of the ConsoleKit package. Not sure how it ties in with udev, though

shefla · 2010-03-15 17:42:10

Hi Painless,

I have quickly read some parts of this website earlier, but I didn't find the answer I expected.
I will try to read carefully the doc when I will have some time to spent to it.

Anyway, many thanks for your help. I close this thread.

Shefla

kgas · 2010-03-15 17:48:18

pcmanfm also complains about the devices mounted thro' udev rules and won't get unmounted. If you take care about the files saving etc just unplug the device.

shefla · 2010-03-15 17:56:22

Agreed Kgas,

This is a quite old school but safe method when you take care of the writing operation.

But I prefer a clean solution because my girl friend also use this machine, and I am pretty sure she will be confused if she does not found the Unmount menu.

Anyway thanks for your help.

Regards

Shefla

Arch Linux

#1 2010-03-05 00:37:56

[SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#2 2010-03-11 13:40:55

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#3 2010-03-11 17:18:42

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#4 2010-03-11 19:11:08

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#5 2010-03-12 10:06:27

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#6 2010-03-12 15:28:54

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#7 2010-03-12 16:47:39

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#8 2010-03-13 01:16:40

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#9 2010-03-13 20:53:27

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#10 2010-03-14 02:40:00

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#11 2010-03-15 16:58:57

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#12 2010-03-15 17:42:10

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#13 2010-03-15 17:48:18

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

#14 2010-03-15 17:56:22

Re: [SOLVED] Unable to unmount USB drive (automatically mounted with UDEV)

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