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Bug#745812: apache2.preinst depends on a2query, which may not exist

Package: apache2
Version: 2.4.9-1
User: ubuntu-devel@lists.ubuntu.com
Usertags: origin-ubuntu utopic

Downstream bug: https://launchpad.net/bugs/1312533

apache2.preinst calls a2query if /etc/apache2/ exists, but a2query is
supplied by apache2 itself, so is not necessarily available at the time
the preinst is called.

This happens on upgrade from << 2.4.7-1~ if the package was previously
installed but removed and not purged.

I'm not exactly sure how to fix this - I don't quite follow the existing

I verified this on Debian as follows:

echo deb http://snapshot.debian.org/archive/debian/20130813T130820Z/ sid main > /etc/apt/sources.list
apt-get -o Acquire::Check-Valid-Until=false update
apt-get install -y apache2  # this installs 2.4.6-3
dpkg -r apache2
echo deb http://cdn.debian.net/debian sid main > /etc/apt/sources.list
apt-get update
apt-get install apache2  # install 2.4.9-1

This blows up as follows:

Preparing to unpack .../apache2_2.4.9-1_amd64.deb ...
/var/lib/dpkg/tmp.ci/preinst: line 118: a2query: command not found
dpkg: error processing archive /var/cache/apt/archives/apache2_2.4.9-1_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

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