#! /bin/bash
# postinst script
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
# * <postinst> `configure' <most-recently-configured-version>
# * <old-postinst> `abort-upgrade' <new version>
# * <conflictor's-postinst> `abort-remove' `in-favour' <package>
# <new-version>
# * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
# <failed-install-package> <version> `removing'
# <conflicting-package> <version>
#
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#

# XXX remove
# echo apache2.postinst $@ running

OBSOLETE_CONFFILES="/etc/apache2/mods-available/authz_default.load
/etc/apache2/mods-available/authn_default.load
/etc/apache2/mods-available/mem_cache.load
/etc/apache2/mods-available/mem_cache.conf
/etc/apache2/mods-available/authn_alias.load
/etc/apache2/mods-available/cern_meta.load
/etc/apache2/mods-available/disk_cache.load
/etc/apache2/mods-available/disk_cache.conf
/etc/apache2/mods-available/ident.load
/etc/apache2/mods-available/imagemap.load
/etc/apache2/mods-available/version.load"


MOVED_CONFFILES="/etc/bash_completion.d/apache2.2-common:/etc/bash_completion.d/apache2
/etc/apache2/sites-available/default:/etc/apache2/sites-available/000-default.conf
/etc/apache2/sites-available/default-ssl:/etc/apache2/sites-available/default-ssl.conf
/etc/apache2/conf.d/charset:/etc/apache2/conf-available/charset.conf
/etc/apache2/conf.d/localized-error-pages:/etc/apache2/conf-available/localized-error-pages.conf
/etc/apache2/conf.d/other-vhosts-access-log:/etc/apache2/conf-available/other-vhosts-access-log.conf
/etc/apache2/conf.d/security:/etc/apache2/conf-available/security.conf"


# the functions below need to be idempotent, however we guess the upgrade based
# on obsolete conffiles which might be removed anytime. Thus, remember we were
# already in there once.
WHEEZY_UPGRADE=0

# n.b you can't rely on $2 (the last installed version) for upgrades, as
# the user might have been using apache2.2-common only. Let's pretend we're
# upgrading if there is either a /etc/apache2/.apache2_mpm_selected file
# around or an /etc/apache2/.apache2_upgrade file exists.
we_are_upgrading_from_wheezy()
{
if [ -n "$2" ] && dpkg --compare-versions "$2" le-nl "2.3"; then
WHEEZY_UPGRADE=1
return 0
fi

# this check is a probably tautology but makes it easier to understand
# the logic
if [ -n "$2" ] && dpkg --compare-versions "$2" ge-nl "2.3"; then
return 1
fi

if [ -e /etc/apache2/.apache2_mpm_selected ] ; then
WHEEZY_UPGRADE=1
return 0
fi

if [ "$WHEEZY_UPGRADE" -eq 1 ] ; then
return 0
fi

for CONFFILE in $OBSOLETE_CONFFILES ; do
if [ -e "$CONFFILE.dpkg-backup" ] || [ -e "$CONFFILE.dpkg-remove" ] ; then
WHEEZY_UPGRADE=1
return 0
fi
done

for CONFFILE in $MOVED_CONFFILES ; do
OLDCONFFILE=$( echo "$CONFFILE" | cut -d: -f1 )
if [ -e "$OLDCONFFILE.dpkg-remove" ] ; then
WHEEZY_UPGRADE=1
return 0
fi
done

return 1
}

is_fresh_install()
{
if [ -z "$2" ] ; then
return 0
fi
return 1
}


# The two functions below are licensed GPL-2+ and was written by dpkg maintainers
# See the dpkg-maintscript-helper script for details

remove_conffiles()
{
# we can't use dpkg-maintscript-helper as we shifted conffiles from the
# apache2.2-common package to apache2, too. The tool can cope with
# that, but additionally we didn't require apache2 to be installed. This
# yields the wrong result when upgrading such an installation
if we_are_upgrading_from_wheezy $@ ; then
for CONFFILE in $OBSOLETE_CONFFILES ; do
if [ -e "$CONFFILE.dpkg-backup" ]; then
mv -f "$CONFFILE.dpkg-backup" "$CONFFILE.dpkg-bak"
fi
if [ -e "$CONFFILE.dpkg-remove" ]; then
echo "Removing obsolete conffile $CONFFILE ..."
rm -f "$CONFFILE.dpkg-remove"
fi
done
fi
}

mv_conffiles()
{
# same rationale as above
if we_are_upgrading_from_wheezy $@ ; then
for CONFFILE in $MOVED_CONFFILES ; do
OLDCONFFILE=$( echo "$CONFFILE" | cut -d: -f1 )
NEWCONFFILE=$( echo "$CONFFILE" | cut -d: -f2 )

rm -f $OLDCONFFILE.dpkg-remove
[ -e "$OLDCONFFILE" ] || continue

echo "Preserving user changes to $NEWCONFFILE (renamed from $OLDCONFFILE)..."
mv -f "$NEWCONFFILE" "$NEWCONFFILE.dpkg-new"
mv -f "$OLDCONFFILE" "$NEWCONFFILE"
done

if [ -d /etc/apache2/conf.d ] && [ ! "$(ls -A /etc/apache2/conf.d)" ] ; then
echo "Removing obsolete directory /etc/apache2/conf.d"
rmdir /etc/apache2/conf.d
fi

if [ -d /etc/apache2/conf.d ] && [ "$(ls -A /etc/apache2/conf.d)" ] ; then
echo "Directory /etc/apache2/conf.d is not empty - leaving as is"
echo "Please note, that directory is considered obsolete and not read anymore by default"
# XXX order of processing??? this may become empty later on (after upgrade of apache2-doc)
ls -A /etc/apache2/conf.d
fi
fi
}


enable_default_mpm()
{
mpm="mpm_event"
if we_are_upgrading_from_wheezy $@ && [ -e /etc/apache2/.apache2_mpm_selected ]; then
tmpmpm=$(grep -v "^#" /etc/apache2/.apache2_mpm_selected | head -n1)
case "$tmpmpm" in
apache2-mpm-worker)
mpm="mpm_worker"
;;

apache2-mpm-event)
mpm="mpm_event"
;;

apache2-mpm-prefork)
mpm="mpm_prefork"
;;

apache2-mpm-itk)
# apache2-mpm-itk is installed, which is a
# transitional package depending on
# libapache2-mpm-itk which will enable itself
# in its maintainer scripts.
mpm="mpm_prefork"
;;

*)
# default MPM for upgrading in case we got an unrecognized
# hint file
mpm="mpm_event"
;;
esac

# No -m here, we pretend the user picked the MPM as this choice comes
# from a 2.2 package relation
a2enmod -q $mpm
return 0
fi

if is_fresh_install $@ ; then
a2enmod -m -q $mpm
fi

}

enable_default_modules()
{
if is_fresh_install $@; then
for module in authz_host auth_basic access_compat authn_file authz_user \
alias dir autoindex \
env mime negotiation setenvif \
filter deflate \
status ; do
a2enmod -m -q $module
done
elif we_are_upgrading_from_wheezy $@; then
for module in authn_core authz_core filter access_compat ; do
a2enmod -m -q $module
done
elif dpkg --compare-versions "$2" "le" "2.4.6-1~" ; then
# These modules had dependencies missing in the initial 2.4 upload
for module in auth_basic auth_digest auth_form cache_disk include ratelimit mpm_event
do
if [ -e /etc/apache2/mods-enabled/$module.load ] ; then
# If module is enabled, enable again to
# enable new dependencies
a2enmod -m -q $module
fi
done
fi
}

enable_default_conf()
{
if is_fresh_install $@ || we_are_upgrading_from_wheezy $@ ; then
for conf in charset localized-error-pages other-vhosts-access-log security ; do
a2enconf -m -q $conf
done
fi
# This line must catch upgrades, upgrades from Wheezy und fresh
# installs
if dpkg --compare-versions "$2" "le" "2.4.1-4" ; then
a2enconf -m -q serve-cgi-bin
fi
}

install_default_site()
{
if we_are_upgrading_from_wheezy $@ ; then
# by here, the old default sites were already renamed. Thus, the links
# are dangling
for SITE in /etc/apache2/sites-enabled/000-default /etc/apache2/sites-enabled/default-ssl ; do
if [ -L $SITE ] ; then
target=$(readlink -e "$SITE") || true
sitename=$(basename "$SITE")
if [ -z "$target" ] ; then
rm -f $SITE
a2ensite -q "$sitename"
fi
fi
done
elif is_fresh_install $@ ; then
if [ ! -L /etc/apache2/sites-enabled/000-default.conf -a \
! -f /etc/apache2/sites-enabled/000-default.conf ]; then
a2ensite -q 000-default
fi

touch /var/log/apache2/error.log /var/log/apache2/access.log
chown root:adm /var/log/apache2/error.log /var/log/apache2/access.log
chmod 0640 /var/log/apache2/error.log /var/log/apache2/access.log

touch /var/log/apache2/other_vhosts_access.log
chown root:adm /var/log/apache2/other_vhosts_access.log
chmod 0640 /var/log/apache2/other_vhosts_access.log
fi
}

# XXX: This site is installed in the apache2-data package. Should the postinst
# scriptlet move there too?
install_default_files()
{
if is_fresh_install $@ || we_are_upgrading_from_wheezy $@ ; then
if [ ! -e /var/www/index.html -a \
! -h /var/www/index.html -a \
! -e /var/www/index.cgi -a \
! -e /var/www/index.pl -a \
! -e /var/www/index.php -a \
! -e /var/www/index.xhtml -a \
! -e /var/www/index.htm ] ; then
cp /usr/share/apache2/default-site/index.html /var/www/html/index.html
fi
fi
}

# XXX: Find out whether I am on crack removing stale modules that way
refresh_modules()
{
if we_are_upgrading_from_wheezy $@ && [ -d /etc/apache2/mods-enabled/ ] ; then
shopt -s nullglob
for link in /etc/apache2/mods-enabled/*.load ; do
target=$(readlink "$link") || true
if [ -z "$target" ] ; then
continue
fi

module=$(basename "$link" | sed 's/\.load//') || true

if [ ! -e "/etc/apache2/mods-enabled/$target" ] ; then
echo "disable obsolete module $module"
a2dismod -m -q "$module"

if [ "$module" = "disk_cache" ] ; then
echo "Enable cache_disk as disk_cache was enabled in Apache 2.2"
# ditto, we pretend it was the user's
# choice not to use -m here
a2enmod -q cache_disk
fi
fi
# the module is already enabled, however
# dependencies could have changed hence re-call
# a2enmod again.
# Example: the deflate module when upgraded from
# Wheezy
if [ -e "/etc/apache2/mods-enabled/$target" ] ; then
a2enmod -m -q "$module"
fi
done
fi
}

move_httpd_conf()
{
if we_are_upgrading_from_wheezy $@ ; then
if [ -e /etc/apache2/httpd.conf ] && [ -f /etc/apache2/httpd.conf ] ; then
local md5sum="$(md5sum /etc/apache2/httpd.conf | sed -e 's/ .*//')"
if [ $md5sum = "d41d8cd98f00b204e9800998ecf8427e" ] ||
[ $md5sum = "a20c3e53dd07836481a5e64bc71e1a33" ]
then
echo "Remove obsolete configuration file /etc/apache2/httpd.conf"
rm -f /etc/apache2/httpd.conf
else
if [ -d /etc/apache2/conf-available/ ] && [ ! -f /etc/apache2/conf-available/httpd.conf ] ; then
echo "Detected legacy httpd.conf - moving file to /etc/apache2/conf-available/httpd.conf"
mv /etc/apache2/httpd.conf /etc/apache2/conf-available/httpd.conf
a2enconf -q httpd
fi
fi
fi
fi
}

migrate_data()
{
#XXX: jimjag recommends purging the cache albeit it is probably not
# technically required.
#if we_are_upgrading_from_wheezy $@ ; then
# # /var/cache/apache2/mod_disk_cache -> /var/cache/apache2/mod_cache_disk
# if [ -d /var/cache/apache2/mod_disk_cache ] && [ "$(ls -A /var/cache/apache2/mod_disk_cache)" ] ; then
# echo "Migrate mod_disk_cache cache data to /var/cache/apache2/mod_cache_disk/"
# mv /var/cache/apache2/mod_disk_cache/* /var/cache/apache2/mod_cache_disk/
# rmdir /var/cache/apache2/mod_disk_cache
# fi
#fi
if we_are_upgrading_from_wheezy $@ ; then
if [ -d /var/cache/apache2/mod_disk_cache ] ; then
echo "Purge obsolete mod_disk_cache cache data in /var/cache/apache2/mod_cache_disk/"
rm -rf /var/cache/apache2/mod_disk_cache
fi
fi
}

warn_itk_users()
{
# the function below only applies to Debian Testing users. Stable users are properly upgraded
if [ -n "$2" ] && dpkg --compare-versions "$2" 'lt' '2.4.7-1~' && dpkg --compare-versions "$2" 'ge' '2.4.1-1' ; then
local mpm=""
[ -e /etc/apache2/.apache2_mpm_selected ] && mpm=$(grep -v "^#" /etc/apache2/.apache2_mpm_selected | head -n1)
if [ "$mpm" = 'apache2-mpm-itk' ] ; then
echo "======================================================================="
echo "You appear to be using the ITK MPM. Starting with Apache2 2.4.7-1 this"
echo "is a separate package not bundled with Apache anymore. Moreover, it is"
echo "not a MPM anymore. This upgrade will switch your MPM to 'prefork'. If"
echo "you plan to use ITK in future, please do: "
echo ""
echo " apt-get install libapache2-mpm-itk"
echo ""
echo "======================================================================="
fi
fi
}

#XXX: Deal with the sites-available/sites-enabled *.conf transition, e.g. rename
# all files which look like site configuration?

case "$1" in
configure)

remove_conffiles $@
mv_conffiles $@
enable_default_mpm $@
refresh_modules $@
install_default_files $@
enable_default_modules $@
enable_default_conf $@
install_default_site $@
move_httpd_conf $@
migrate_data $@
warn_itk_users $@

# post installation cleanup
if [ -e /etc/apache2/.apache2_mpm_selected ] ; then
rm -f /etc/apache2/.apache2_mpm_selected
fi


;;

abort-upgrade|abort-remove|abort-deconfigure)

;;

*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac

# Automatically added by dh_installinit
if [ -x "/etc/init.d/apache2" ] || [ -e "/etc/init/apache2.conf" ]; then
if [ ! -e "/etc/init/apache2.conf" ]; then
update-rc.d apache2 defaults 91 09 >/dev/null
fi
if [ -n "$2" ]; then
_dh_action=restart
else
_dh_action=start
fi
invoke-rc.d apache2 $_dh_action || true
fi
# End automatically added section


# And now the traditional insanity of apache2 upgrades (see #390823):
# If everything went well, we need to purge apache2.2-common's postrm, or
# purging that package will remove our logs, caches, ...
if [ "$1" = configure ] && we_are_upgrading_from_wheezy $@ ; then
oldpostrm=$(dpkg-query -c apache2.2-common postrm 2>/dev/null || true)
if [ -n "$oldpostrm" ] ; then
rm -f "$oldpostrm"
fi
fi

exit 0

# vim: syntax=sh ts=4 sw=4 sts=4 sr noet