postinst is in alsa-base 1.0.25+dfsg-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
MYNAME="$0"
# $* message
warn() { echo "${MYNAME}: Warning: $*" >&2 ; }
# $* message
report_error() { echo "${MYNAME}: Error: $*" >&2 ; }
# Move a conffile without triggering a dpkg question
mv_conffile() {
OLDCONFFILE="$1"
NEWCONFFILE="$2"
if [ -e "$OLDCONFFILE" ]; then
echo "Preserving user changes to $NEWCONFFILE"
mv -f "$NEWCONFFILE" "$NEWCONFFILE".dpkg-new
mv -f "$OLDCONFFILE" "$NEWCONFFILE"
elif [ -e "$OLDCONFFILE".dpkg-bak ]; then
rm -f "$OLDCONFFILE".dpkg-bak
fi
}
case "$1" in
configure|reconfigure)
if dpkg --compare-versions "$2" lt "1.0.23+dfsg-1ubuntu4"; then
mv_conffile /etc/modprobe.d/alsa-base \
/etc/modprobe.d/alsa-base.conf
mv_conffile /etc/modprobe.d/blacklist-modem \
/etc/modprobe.d/blacklist-modem.conf
fi
# Decide which conf file to read
conf_file=""
if [ -f /etc/default/alsa ] ; then
conf_file=/etc/default/alsa
elif [ -f /usr/share/alsa-base/alsa.default ] ; then
conf_file=/usr/share/alsa-base/alsa.default
else
report_error "No configuration file found"
exit 1
fi
# Read variables from conf file
force_unload_modules_before_suspend="$(
. "$conf_file" >/dev/null 2>&1
echo "$force_unload_modules_before_suspend"
)"
# Write new conf file
cat /usr/share/alsa-base/alsa.default | sed \
-e "s/force_unload_modules_before_suspend=.*/force_unload_modules_before_suspend=\"${force_unload_modules_before_suspend}\"/" \
> /etc/default/alsa
# Set up apm symlinks
[ -f /etc/apm/scripts.d/alsa ] || warn "/etc/apm/scripts.d/alsa is absent"
# $1: file to check
already_linked_to_alsa()
{
[ "$1" ] || return 1
[ -L "$1" ] || return 1
[ "$(basename "$(readlink "$1")")" = alsa ] || return 1
return 0
}
ALREADY_LINKED=no
for F in /etc/apm/suspend.d/??alsa ; do
already_linked_to_alsa "$F" && ALREADY_LINKED=yes && break
done
[ "$ALREADY_LINKED" = yes ] || ln -sf ../scripts.d/alsa /etc/apm/suspend.d/80alsa
ALREADY_LINKED=no
for F in /etc/apm/resume.d/??alsa ; do
already_linked_to_alsa "$F" && ALREADY_LINKED=yes && break
done
[ "$ALREADY_LINKED" = yes ] || ln -sf ../scripts.d/alsa /etc/apm/resume.d/20alsa
;;
abort-upgrade|abort-remove|abort-deconfigure)
# We don't have to do anything because we didn't do anything in prerm
exit 0
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
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