Bug#628913: exim4-base.postinst overrides admin-set permissions on /var/log/exim4

[Philipp Kern]

Package: exim4-base
Version: 4.69-9+lenny4
Severity: normal

[ /var/lib/dpkg/info/exim4-base.postinst ]
| case "$1" in
|   configure)
[...]
|         # Create directories for log etc
|         # install also fixes permissions.
|         install -d -oDebian-exim -gadm -m2750 /var/log/exim4

This overrides any permissions the admin set for /var/log/exim4 unconditionally
and without a way through, say, dpkg-statoverride.  I think it should check
if the directory exists and it's writeable by Debian-exim, but that's about it.

In my case I want that directoryto be 2755 or the group being list, but both
would be overridden on the next update.

Squeeze is likewise affected, didn't check unstable.

-- System Information:
Debian Release: 5.0.8
  APT prefers oldstable-proposed-updates
  APT policy: (500, 'oldstable-proposed-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages exim4-base depends on:
ii  adduser                    3.110         add and remove users and groups
ii  cron                       3.0pl1-105    management of regular background p
ii  debconf [debconf-2.0]      1.5.24        Debian configuration management sy
ii  exim4-config [exim4-config 4.69-9+lenny4 configuration for the Exim MTA (v4
ii  libc6                      2.7-18lenny7  GNU C Library: Shared libraries
ii  libdb4.6                   4.6.21-11     Berkeley v4.6 Database Libraries [
ii  lsb-base                   3.2-20        Linux Standard Base 3.2 init scrip
ii  netbase                    4.34          Basic TCP/IP networking system

Versions of packages exim4-base recommends:
ii  bsd-mailx [mailx]  8.1.2-0.20071201cvs-3 A simple mail user agent
ii  perl-modules       5.10.0-19lenny3       Core Perl modules
ii  psmisc             22.6-1                Utilities that use the proc filesy

Versions of packages exim4-base suggests:
ii  bsd-mailx [mail-re 8.1.2-0.20071201cvs-3 A simple mail user agent
pn  exim4-doc-html | e <none>                (no description available)
pn  eximon4            <none>                (no description available)
ii  file               4.26-1                Determines file type using "magic"
pn  libmail-spf-query- <none>                (no description available)
ii  mutt [mail-reader] 1.5.18-6              text-based mailreader supporting M
ii  openssl            0.9.8g-15+lenny11     Secure Socket Layer (SSL) binary a
ii  swaks              0+20061116.0-2        SMTP command-line test tool

-- debconf information:
  exim4/purge_spool: false
  exim4-base/drec:
  exim4/move_exim3_spool: false