[Bug 1156540] [NEW] cowdancer deletes bind-mounted directories

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Jean-Baptiste Lallement (jibel):

If cowbuilder failed to unmount a bind-mounted directory (device busy
for example) it unconditionally deletes its content during the clean-up
phase.

Excerpt from a log with this bug (complete log attached)
=====
I: umounting /var/lib/jenkins/cu2d
umount: /var/cache/pbuilder/build/cow.15281/var/lib/jenkins/cu2d: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
[...]
 -> Cleaning COW directory
  forking: rm -rf /var/cache/pbuilder/build//cow.1195
rm: cannot remove `/var/cache/pbuilder/build//cow.1195/var/cache/pbuilder/ccache': Device or resource busy
rm: cannot remove `/var/cache/pbuilder/build//cow.1195/var/lib/jenkins/cu2d/work/experimental/100scopes': Device or resource busy
rm: cannot remove `/var/cache/pbuilder/build//cow.1195/var/lib/jenkins/cu2d/launchpad.cache': Directory not empty
=====

The 'rm' command must skip directories on other filesystems

This bug occurs when pbuilder fails to mount a bindmounted directory,
then fails to unmount previously successfully mounted directories. This
condition is not so rare when executing several cowbuilder processes in
parallel using the same bind-mounted directories.

There is no easy way to reproduce this issue:
- Start several cowbuilder in parallel (in our system we run around 40) and bind mount the same source directories
- patch /usr/lib/pbuilder/pbuilder-modules lines 275 to 291 to fail on 2nd bindmount then fail when it tries to unmount one of the successfully mounted directory.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: cowbuilder 0.71
ProcVersionSignature: Ubuntu 3.8.0-12.21-generic 3.8.2
Uname: Linux 3.8.0-12-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
Date: Mon Mar 18 11:08:38 2013
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: cowdancer
UpgradeStatus: Upgraded to raring on 2012-01-31 (411 days ago)

** Affects: cowdancer (Ubuntu)
     Importance: Critical
         Status: New

** Affects: cowdancer (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: amd64 apport-bug qa-daily-testing raring ue-desktop
-- 
cowdancer deletes bind-mounted directories
https://bugs.launchpad.net/bugs/1156540
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