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Bug#745834: marked as done (dh-apache2 causes a postinst failure when a package depends on an apache2-bin provided module)

Your message dated Sun, 28 Sep 2014 21:19:46 +0000
with message-id <E1XYLsg-0005Io-Eb@franck.debian.org>
and subject line Bug#745834: fixed in apache2 2.4.10-3
has caused the Debian Bug report #745834,
regarding dh-apache2 causes a postinst failure when a package depends on an apache2-bin provided module
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
745834: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745834
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: apache2
Version: 2.4.9-1
User: ubuntu-devel@lists.ubuntu.com
Usertags: origin-ubuntu utopic

If I install apache2 at the same time as libapache2-mod-svn, then it is
possible that both packages are unpacked, but
libapache2-mod-svn is configured first.

In this case, /usr/share/apache2/apache2-maintscript-helper exists, so
the dh-apache2 -inserted snippet in libapache2-mod-svn tries to enable
the dav_svn module. This depends on the dav module, and the call to
"a2enmod -m -q dav_svn" subsequently fails, causing libapache2-mod-svn
to fail silently.

During debugging I found that the error message was:

ERROR: Module dav does not exist!
ERROR: Could not enable dependency dav for dav_svn, aborting

At this point, I see that /etc/apache2/mods-available/dav.load does not
exist (but /etc/apache2/mods-available/dav.load.dpkg-new does exist). It
seems that this is provided by the apache2 binary package, which has yet
to be configured. I presume that this causes a2enmod to fail to see it.

Steps to reproduce. As root on a fresh amd64 sid machine:

apt-get clean
apt-get install -y --download-only libapache2-mod-svn apache2
mkdir 1 2
mv /var/cache/apt/archives/*.deb 1/
mv 1/apache2_2.4.9-1_amd64.deb 1/libapache2-mod-svn_1.8.8-2_amd64.deb 2/
dpkg -i 1/*
dpkg --unpack 2/*
dpkg --configure libapache2-mod-svn

This fails with:

Setting up libapache2-mod-svn (1.8.8-2) ...
dpkg: error processing package libapache2-mod-svn (--configure):
 subprocess installed post-installation script returned error exit
status 1
Errors were encountered while processing:
 libapache2-mod-svn

I'm not sure how best to approach this problem. Given that I am
installing the packages together, I do expect dav_svn to be enabled
when it is done, so simply not doing so in this case wouldn't really
work. Having a2enmod special-case .dpkg-new files seems bad to me too.
We can't depend on apache2 since the module providing package should be
able to be installed independently. The only thing I can think of is to
notice that apache2 isn't configured, and note what needs to be done
later somehow, but this wouldn't be as trivial as I would like it.

In Ubuntu, this is causing our subversion dep8 test to fail, since it
installs libapache2-mod-svn and apache2 together. I presume this will
affect Debian also. I suppose a workaround for now is to have the test
install apache2 first.

Attachment: signature.asc
Description: Digital signature


--- End Message ---
--- Begin Message --- 
Source: apache2
Source-Version: 2.4.10-3

We believe that the bug you reported is fixed in the latest version of
apache2, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 745834@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Stefan Fritsch <sf@debian.org> (supplier of updated apache2 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sun, 28 Sep 2014 22:37:02 +0200
Source: apache2
Binary: apache2 apache2-data apache2-bin apache2-mpm-worker apache2-mpm-prefork apache2-mpm-event apache2-mpm-itk apache2.2-bin apache2.2-common libapache2-mod-proxy-html libapache2-mod-macro apache2-utils apache2-suexec apache2-suexec-pristine apache2-suexec-custom apache2-doc apache2-dev apache2-dbg
Architecture: source amd64 all
Version: 2.4.10-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Apache Maintainers <debian-apache@lists.debian.org>
Changed-By: Stefan Fritsch <sf@debian.org>
Description:
 apache2    - Apache HTTP Server
 apache2-bin - Apache HTTP Server (modules and other binary files)
 apache2-data - Apache HTTP Server (common files)
 apache2-dbg - Apache debugging symbols
 apache2-dev - Apache HTTP Server (development headers)
 apache2-doc - Apache HTTP Server (on-site documentation)
 apache2-mpm-event - transitional event MPM package for apache2
 apache2-mpm-itk - transitional itk MPM package for apache2
 apache2-mpm-prefork - transitional prefork MPM package for apache2
 apache2-mpm-worker - transitional worker MPM package for apache2
 apache2-suexec - transitional package for apache2-suexec-pristine
 apache2-suexec-custom - Apache HTTP Server configurable suexec program for mod_suexec
 apache2-suexec-pristine - Apache HTTP Server standard suexec program for mod_suexec
 apache2-utils - Apache HTTP Server (utility programs for web servers)
 apache2.2-bin - Transitional package for apache2-bin
 apache2.2-common - Transitional package for apache2
 libapache2-mod-macro - Transitional package for apache2-bin
 libapache2-mod-proxy-html - Transitional package for apache2-bin
Closes: 719930 745812 745834 746359 762645 762908
Changes:
 apache2 (2.4.10-3) unstable; urgency=medium
 .
   * CVE-2014-3581: Fix a DoS in mod_cache.
   * If apache2 is not configured yet, defer actions executed via
     apache2-maintscript-helper. This fixes installation failures if a
     module package is configured first. Closes: #745834
   * Don't use a2query in preinst, as it may not be available yet.
     Closes: #745812
   * Include mod_authnz_fcgi. Closes: #762908
   * Add some comments about SSLHonorCipherOrder in ssl.conf. Closes: #746359
   * Remove misleading sentence in apache2-bin's description. Closes: #762645
   * Remove trailing space in apache2/suexec/www-data. Closes: #719930
   * Add NEWS entry for the logrotate change in 2.4.10-2.
   * Bump Standards-version (no changes).
   * Fix lintian warning: Tweak licence short names in copyright file.
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