#254 - race condition in RPM init script

X2Go Bug report logs - #254
race condition in RPM init script

Date: Fri, 28 Jun 2013 19:33:02 UTC

Severity: normal

Tags: moreinfo, rpm-packages

Found in version 4.0.1.1

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Date: Fri, 28 Jun 2013 20:25:43 +0100
From: Olav Smørholm <ccsmac@live.warwick.ac.uk>
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Subject: x2goserver (RPM issue)
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Package: x2goserver Version: 4.0.1.1 There is a race condition in the x2gocleansessions init script, causing it to kill itself on a fast machine. Thus the rpm cannot be cleanly uninstalled without disabling %preun scripts. # /etc/init.d/x2gocleansessions stop Terminated # zypper rm x2goserver Loading repository data... Reading installed packages... Resolving package dependencies... The following package is going to be REMOVED: x2goserver 1 package to remove. After the operation, 203.0 KiB will be freed. Continue? [y/n/?] (y): y Removing x2goserver-4.0.1.1-2.5.csc [error] Removal of (26663)x2goserver-4.0.1.1-2.5.csc.x86_64(@System) failed: Error: Subprocess failed. Error: RPM failed: /var/tmp/rpm-tmp.7904: line 7: /etc/init.d/x2gocleansession: No such file or directory error: %preun(x2goserver-4.0.1.1-2.5.csc.x86_64) scriptlet failed, exit status 127 Abort, retry, ignore? [a/r/i] (a): Problem occured during or after installation or removal of packages: Installation aborted by user Please see the above error message for a hint. # rpm -e --nopreun x2goserver # The init script "fixed" in this way: stop() { # kill x2gocleansessions, ignore on failure if ps aux | grep x2gocleans | grep -q perl then ps aux | grep x2gocleansessions | grep -v init |grep -v grep | awk '{print $2}' | xargs kill -9 fi } But this is not really a fix, as the script will fail if the perl script exits before it can be killed. Would be better if the init script or perl script was renamed and used pkill -x instead, but pkill has a problem will long program names. Anoter issue for SLES, is that perl module File::Path is outdated, and is still using the legacy mkpath instead of make_path. So there needs to be a check for this. Not sure if this changes with SP3, but it is at least the case for SP2. This causes x2godbadmin --create to fail: # x2godbadmin --create "make_path" is not exported by the File::Path module Can't continue after import errors at /usr/sbin/x2godbadmin line 25 BEGIN failed--compilation aborted at /usr/sbin/x2godbadmin line 25. But I really do question the wisdom of having an init script call an external perl script to do its job. Ideally it should all be handled by the init script. Best Regards, -- Olav Smørholm Centre for Scientific Computing, University of Warwick

X2Go Developers <owner@bugs.x2go.org>. Last modified: Thu Nov 21 14:44:01 2024; Machine Name: ymir.das-netzwerkteam.de

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X2Go Bug report logs - #254 race condition in RPM init script

X2Go Bug report logs - #254
race condition in RPM init script