[Bug 1428288] [NEW] dist-upgrade failed: apache2 postinst failed on absolute symlinks in mods-enabled
Launchpad Bug Tracker
1428288 at bugs.launchpad.net
Thu Mar 31 16:28:19 UTC 2016
You have been subscribed to a public bug by ChristianEhrhardt (paelzer):
I tried to upgrade from 12.04 LTS to 14.04 LTS using "do-release-
upgrade". The system had previously (a few minutes previously) been
upgraded from 10.04 LTS to 12.04 LTS. As far as I can tell, the first
upgrade was successful, but the second failed when trying to configure
apache2:
disable obsolete module dav_fs
Module dav_fs disabled.
disable obsolete module dav
ERROR: The following modules depend on dav and need to be disabled first: dav_svn
dpkg: error processing package apache2 (--configure):
subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports has already been reached
…
Please report this bug in a browser at
http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebug
and attach the files in /var/log/dist-upgrade/ to the bug report.
installArchives() failed
I think this is caused by the fact that I have absolute symlinks in
/etc/apache2/mods-enabled:
root at sigurd:/home/bjh21# ls -o /etc/apache2/mods-enabled/dav*
lrwxrwxrwx 1 root 36 Nov 12 2012 /etc/apache2/mods-enabled/dav.load -> /etc/apache2/mods-available/dav.load
lrwxrwxrwx 1 root 30 Nov 12 2012 /etc/apache2/mods-enabled/dav_svn.conf -> ../mods-available/dav_svn.conf
lrwxrwxrwx 1 root 40 Nov 12 2012 /etc/apache2/mods-enabled/dav_svn.load -> /etc/apache2/mods-available/dav_svn.load
The code that detects obsolete modules in apache2.postinst looks like it
will (accidentally) not work with absolute symlinks:
refresh_modules()
{
if we_are_upgrading_from_wheezy $@ && [ -d /etc/apache2/mods-enabled/ ] ; then
shopt -s nullglob
for link in /etc/apache2/mods-enabled/*.load ; do
target=$(readlink "$link") || true
if [ -z "$target" ] ; then
continue
fi
module=$(basename "$link" | sed 's/\.load//') ||
true
if [ ! -e "/etc/apache2/mods-enabled/$target" ] ; then
echo "disable obsolete module $module"
a2dismod -m -q "$module"
etc.
Concatenating the symlink contents with the directory name only works
for relative symlinks. A simpler approach would be simply to check the
link for existence, which will treat broken links as non-existent:
if [ ! -e "${link}" ]; then
** Affects: apache2 (Ubuntu)
Importance: Medium
Status: Triaged
--
dist-upgrade failed: apache2 postinst failed on absolute symlinks in mods-enabled
https://bugs.launchpad.net/bugs/1428288
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