Package: dbconfig-common
Version: 1.8.39
Severity: normal
Dear folks,
Studying /usr/share/dbconfig-common/dpkg/postinst I think I found a
serious bug in _dbc_find_upgrades() function.
Let's see a simplified file structure:
$ find
..
../upgrade
../upgrade/mysql
../upgrade/mysql/2
../upgrade/mysql/2/T
../upgrade/mysql/2/E
../upgrade/mysql/3
../upgrade/mysql/3/D.sql
../upgrade/mysql/1
../upgrade/mysql/1/B.sql
../upgrade-dbadmin
../upgrade-dbadmin/mysql
../upgrade-dbadmin/mysql/2
../upgrade-dbadmin/mysql/2/A
$
$ upgradedirs="./upgrade/mysql ./upgrade-dbadmin/mysql"
In this case $f in the second for cycle will be substituted by the following
values: A B.sql D.sql E T.
$ find $upgradedirs -xtype f -print0 | xargs --no-run-if-empty -0 -n1 basename
| sort -n | uniq
A
B.sql
D.sql
E
T
$
However we need not filenames but version numbers as arguments
of "dpkg --compare-versions", i.e. 1 2 3 in this example.
The for cycle should look like this or so:
for f in `find $upgradedirs -xtype f -print0 |
xargs --no-run-if-empty -0 -n1 dirname | xargs -n1 basename |
sort -n | uniq`; do
if dpkg --compare-versions $dbc_oldversion lt $f; then
pending="$pending $f"
fi
done
Note: "sort -n" in the original version is useless because it is applied
on script names instead of package versions.
Unfortunately the package versions are not single integers so sorting
them is not a trivial problem:
$ sort -n << EOT
> 5.15.5-1
> 15.15.5-3
> 5.5.15-0
> EOT
5.15.5-1
5.5.15-0
15.15.5-3
$
So what about a little more complex package versions like 5.0.51a-24+lenny1 ?
On can say that we can write our sort routine using "dpkg --compare-versions"
as the following for cycle does but be careful. Full paths are not comparable:
$ dpkg --compare-versions ./upgrade-dbadmin/mysql/2/A lt ./upgrade/mysql/1/B.sql
$ echo $?
0
$
Only the VERSION directory names must be sorted in such a way in order
to ensure scripts are executed in the proper order.
So I'm afraid this part of postinst script should be totally rewritten.
Any comment?
Gabor
-- System Information:
Debian Release: 5.0.1
APT prefers proposed-updates
APT policy: (500, 'proposed-updates'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.26-1-686 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash
Versions of packages dbconfig-common depends on:
ii debconf [debconf-2.0] 1.5.24 Debian configuration management sy
ii ucf 3.0016 Update Configuration File: preserv
dbconfig-common recommends no packages.
Versions of packages dbconfig-common suggests:
ii mysql-client-5.0 [virt 5.0.51a-24+lenny1 MySQL database client binaries
-- debconf information excluded
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