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Hi Tanguy,
(also putting Jonathan on CC: who asked the same question basically)
On 22.03.2012 10:58, Tanguy Ortolo wrote:
> Just to be sure, is there a better solution to handle the
> transition than to wait for Apache 2.4 to come into unstable,
> breaking these packages, and then fix them by sending updated
> versions?
>
First, I'm sorry our answer took so long but we needed to discuss
questions like this. The answer is: Yes, we can imagine a scenario
where this is possible. We are going to update our docs with practical
hands-on tutorials until then take this
If you are packaging web applications which want to support both,
Apache 2.2 and 2.4 packages you can follow this procedure (note this
is a rough draft!):
1) Make sure you do not depend on any Apache package other than "apache2"
2) Install your configuration files to
/etc/apache2/conf-available/packagename.conf
3) Check your configuration. Chances are it needs an updated for 2.4 -
take special care whether you use Order/Allow/Deny directives. You can
use <IfVersion> to tell 2.2 and 2.4 versions apart [1]. NOTE:
IfVersion is not enabled by default in both, 2.2 and 2.4. At least for
2.4 we plan to change that with the next upload, but we can't anymore
for 2.2.
4) If you detect a 2.4 installation invoke the
apache2-maintscript-helper, otherwise invoke 2.2 tools.
5) Likewise, remove the link unconditionally in your package's postrm.
This is to make sure, upgrades to 2.4 work fine.
The following example is a postinst fragment (untested, but hopefully
you will get the idea!)
if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
. /usr/share/apache2/apache2-maintscript-helper
# if the configuration uses <IfVersion> uncomment the invoke
# call below.
# This is not needed anymore once we uploaded the next version.
# apache2_invoke enmod version
apache2_invoke enconf package.conf
elif dpkg-query -f '${Version}' -W 'apache2.2-common' > /dev/null
2>&1 ; then
# if the configuration uses <IfVersion> uncomment the next line
# a2enmod -q version
[ -d /etc/apache2/conf.d/ ] && [ ! -l
/etc/apache2/conf.d/package.conf ] && ln -s
../conf-available/package.conf /etc/apache2/conf.d/package.conf
else
# you don't install on a site with Apache installed
fi
We are going to update our docs and procedures soon, in particular I
will write such a tutorial on [2] unless someone of you beats me with
it, who actually tested our proposal to support both server versions
in a web application.
[1] http://httpd.apache.org/docs/2.4/mod/mod_version.html#ifversion
[2] http://wiki.debian.org/Apache/PackagingFor24
- --
with kind regards,
Arno Töll
IRC: daemonkeeper on Freenode/OFTC
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