live-build/helpers/lh_chroot_cache

#!/bin/sh

# lh_chroot_cache(1) - cach chroot stage
# Copyright (C) 2006-2007 Daniel Baumann <daniel@debian.org>
#
# live-helper comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
# This is free software, and you are welcome to redistribute it
# under certain conditions; see COPYING for details.

set -e

# Including common functions
LH_BASE="${LH_BASE:-/usr/share/live-helper}"

for FUNCTION in "${LH_BASE}"/functions/*.sh
do
	. "${FUNCTION}"
done

# Setting static variables
DESCRIPTION="cache chroot stage"
HELP=""
USAGE="${PROGRAM} [--force]"

Arguments "${@}"

# Reading configuration files
Read_conffile config/common
Read_conffile config/bootstrap
Read_conffile config/chroot
Read_conffile config/binary
Read_conffile config/source
Read_conffile "${LH_CONFIG}"
Set_defaults

Echo_message "Begin caching chroot stage..."

for STAGE in ${LH_CACHE_STAGES}
do
	if [ "${STAGE}" = "chroot" ]
	then
		case "${1}" in
			restore)
				# Checking stage file
				Check_stagefile .stage/chroot_cache.restore

				if [ -d cache/stages_chroot ]
				then
					# Checking lock file
					Check_lockfile .lock

					# Creating lock file
					Create_lockfile .lock

					# Removing old chroot
					rm -rf chroot

					# Restoring old cache
					${LH_ROOT_COMMAND} cp -a cache/stages_chroot chroot

					if [ -n "${LH_ROOT_COMMAND}" ]
					then
						${LH_ROOT_COMMAND} chown -R `whoami`:`whoami` chroot
					fi

					# Creating stage file
					Create_stagefile .stage/chroot_cache.restore

					exit 0
				fi
				;;

			save)
				# Checking stage file
				Check_stagefile .stage/chroot_cache.save

				# Checking lock file
				Check_lockfile .lock

				# Creating lock file
				Create_lockfile .lock

				rm -rf cache/stages_chroot

				mkdir -p cache

				${LH_ROOT_COMMAND} cp -a chroot cache/stages_chroot

				if [ -n "${LH_ROOT_COMMAND}" ]
				then
					${LH_ROOT_COMMAND} chown -R `whoami`:`whoami` cache/stages_chroot
				fi

				# Creating stage file
				Create_stagefile .stage/chroot_cache.save
				;;
		esac
	fi
done