Bug 36717

Summary:	Remotely mounted USB drives are not cleaned up properly
Product:	Z_Univention Corporate Client (UCC)	Reporter:	Michael Grandjean <grandjean>
Component:	Terminal services	Assignee:	Moritz Muehlenhoff <jmm>
Status:	CLOSED FIXED	QA Contact:	Erik Damrose <damrose>
Severity:	normal
Priority:	P5	CC:	jmm
Version:	UCC 2.0
Target Milestone:	UCC 2.0-errata
Hardware:	Other
OS:	Linux
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Description Michael Grandjean

2014-11-14 16:51:41 CET

This also applies to UCC 2.0

+++ This bug was initially created as a clone of Bug #36716 +++

When plugging in a USB pendrive the partitions are mounted to /run/drives and then shown in drive Z: in the remote session:

> root@ucc-veriton:~# ls -l /run/drives/
> insgesamt 4
> drwxr-xr-x 2 root root   40 Nov 14 16:27 usbdisk-sdb
> drwxrwxrwx 1 root root 4096 Nov 14 16:27 usbdisk-sdb1

If one unplugs the USB pendrive, sdb1 is removed, but sdb is not:

root@ucc-veriton:~# ls -l /run/drives/
insgesamt 0
drwxr-xr-x 2 root root 40 Nov 14 16:27 usbdisk-sdb

Thus, sdb is also still visible in the remote session, although the pendrive is not available anymore (see attached screenshot).

I don't see the necessity to mount sdb in the first place: it's always empty and the needed data partitions are always followed by a digit (e.g. sdb1). 

For a customer I adapted the blacklisting for ram and loop devices to also blacklist exact matches of 'sda', 'sdb', 'sdc' ... (Ticket#2014110321000159)

I have seen this in Citrix XenApp sessions where sdb doesn't seem to disappear at all and in RDP sessions, where sdb disappeared after a couple if minutes. 
I used at least two different USB pen drives and different combinations of fat32, ntfs, formatted with gparted and formatted with windows.

Comment 1 Moritz Muehlenhoff

2014-12-05 12:30:19 CET

This has been fixed in univention-ucc-remote-mount. 

Since there might be rare cases where the old behaviour might be desired, I added the UCR variable ucc/mount/fullpartition; if it is set to "true" the old behaviour is kept.

Comment 2 Moritz Muehlenhoff

2014-12-05 12:31:22 CET

YAML file: 2014-12-05-univention-ucc-remote-mount.yaml

Comment 3 Erik Damrose

2014-12-05 17:01:37 CET

Verified

Comment 4 Moritz Muehlenhoff

2014-12-08 12:47:23 CET

http://errata.univention.de/ucc/2.0/7.html