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#BEGIN CREATE_CONFIG_FROM_TEMPLATE
create_config_from_template() {
local config="$1"
local template="$2"
local firstver="$3"
if [ "$4" != "--" ]; then
echo "create_config_from_template called with the wrong number of arguments" >&2
return 1
fi
for _ in $(seq 1 4); do
shift
done
if [ -n "$2" ] && dpkg --compare-versions -- "$2" gt "$firstver"; then
# The package is already configured, and the version that's been
# configured is new enough to contain the config file
if [ -e "$config.dpkg-backup" ]; then
# The package had been configured in the past and has
# subsequently been removed without purging, so a backup of
# the config file is still present on the disk. Restore it
mv -f "$config.dpkg-backup" "$config"
return 0
else
# We're doing a regular upgrade. Don't change anything
return 0
fi
else
# We're either installing from scratch, or upgrading from a version
# that didn't have the config file yet. Make a copy of the template
# in the appropriate location and with the expected permissions
install -o root -g root -m 0600 "$template" "$config"
return 0
fi
}
#END CREATE_CONFIG_FROM_TEMPLATE
#BEGIN REMOVE_CONFIG_FROM_TEMPLATE
remove_config_from_template() {
local config="$1"
local template="$2"
local firstver="$3"
if [ "$4" != "--" ]; then
echo "remove_config_from_template called with the wrong number of arguments" >&2
return 1
fi
for _ in $(seq 1 4); do
shift
done
if [ "$1" = "remove" ] && [ -e "$config" ]; then
# When removing the package, move the configuration file to the side
# so that the daemon no longer sees it, but we can still restore it
# at a later time if the package is reinstalled
mv -f "$config" "$config.dpkg-backup"
return 0
fi
if [ "$1" = "purge" ]; then
# When purging the package, remove all traces of the configuration
rm -f "$config" "$config.dpkg-backup"
return 0
fi
}
#END REMOVE_CONFIG_FROM_TEMPLATE
#BEGIN CREATE_PROTECTIVE_DIVERSION
create_protective_diversion() {
local usrfile="$1"
local firstver="$2"
if [ "$3" != "--" ]; then
echo "create_protective_diversion called with the wrong number of arguments" >&2
return 1
fi
for _ in $(seq 1 3); do
shift
done
# If we're upgrading from a new enough version of the package, it means
# that usr-merge has already happened and we don't need to mess with
# diversions at all
if [ -n "$2" ] && dpkg --compare-versions -- "$2" gt "$firstver"; then
return 0
fi
dpkg-divert \
--no-rename \
--divert "$usrfile.usr-is-merged" \
--add "$usrfile"
}
#END CREATE_PROTECTIVE_DIVERSION
#BEGIN DELETE_PROTECTIVE_DIVERSION
delete_protective_diversion() {
local usrfile="$1"
local firstver="$2"
if [ "$3" != "--" ]; then
echo "delete_protective_diversion called with the wrong number of arguments" >&2
return 1
fi
for _ in $(seq 1 3); do
shift
done
# If the diversion doesn't exist there's nothing to clean up
if [ -z "$(dpkg-divert --list "$usrfile")" ]; then
return 0
fi
dpkg-divert \
--no-rename \
--divert "$usrfile.usr-is-merged" \
--remove "$usrfile"
}
#END DELETE_PROTECTIVE_DIVERSION
#BEGIN SYSTEMD_DAEMON_RELOAD
systemd_daemon_reload() {
if [ -z "$DPKG_ROOT" ] && [ -d /run/systemd/system ]; then
systemctl --system daemon-reload >/dev/null || true
fi
}
#END SYSTEMD_DAEMON_RELOAD
#BEGIN SYSTEMD_UNIT_RESTART_IF_ACTIVE
systemd_unit_restart_if_active() {
if [ -z "$DPKG_ROOT" ] && [ -d /run/systemd/system ]; then
for unit in "$@"; do
if systemctl is-active -q "$unit"; then
deb-systemd-invoke restart "$unit" >/dev/null || true
fi
done
fi
}
#END SYSTEMD_UNIT_RESTART_IF_ACTIVE
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