live-build/scripts/build/chroot_cache

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2010 Daniel Baumann <daniel@debian.org>
##
## live-build 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:-/usr/share/live/build}"/scripts/build.sh

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

Arguments "${@}"

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
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