Bug#657751: gdm3: 657751: patch to fix purging when gdm3 is running

[Paul Wise]

tags 657751 + patch
thanks

The issue seems to be that userdel doesn't allow removal when a user is
still in use and gdm3 uses the Debian-gdm user to run parts of itself.

The prerm already tries to stop gdm3 when there is no user logged in and
in this case it seems that there is a user logged in so it doesn't stop.

Killing an active user session doesn't seem to be appropriate,
especially since it could be controlling the dpkg/apt process running
the postrm script.

However, that is all moot because the postrm script should not fail
since it ignores any success/failure of deluser.

It appears the stdout and stderr of userdel is leaking into the code
that purges info from the debconf db. Obviously that output is not a
valid command stream for db_purge so it fails.

If we load the debconf confmodule before generating any output, then the
code in the debconf confmodule will handle redirecting stdout/stderr
correctly so that there are no failures, patch below:

--- gdm3-3.0.4/debian/gdm3.postrm
+++ gdm3-3.0.4/debian/gdm3.postrm
@@ -1,6 +1,13 @@
 #!/bin/sh
 set -e
 
+# Need to load this before any output on stdout/stderr
+# otherwise the debconf command-stream will get
+# some invalid input and cause the failure of postrm.
+if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
+        . /usr/share/debconf/confmodule
+fi
+
 if [ "$1" = "purge" ] ; then
         update-rc.d gdm3 remove >/dev/null
         if [ -d /etc/gdm3 ]; then

-- 
bye,
pabs

http://wiki.debian.org/PaulWise
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