live-build/scripts/build/chroot_cache

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2013 Daniel Baumann <daniel@debian.org>
##
## This program 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
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/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

for STAGE in ${LB_CACHE_STAGES}
do
	if [ "${STAGE}" = "chroot" ]
	then
		case "${1}" in
			restore)
				Echo_message "Restoring chroot stage from cache..."

				# Checking stage file
				Check_stagefile .build/chroot_cache.restore

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

					# Creating lock file
					Create_lockfile .lock

					# Removing old chroot
					rm -rf chroot

					# Restoring old cache
					cp -a cache/chroot chroot

					# Creating stage file
					Create_stagefile .build/chroot_cache.restore

					exit 0
				fi
				;;

			save)
				Echo_message "Saving chroot stage to cache..."

				# Checking stage file
				Check_stagefile .build/chroot_cache.save

				# Checking lock file
				Check_lockfile .lock

				# Creating lock file
				Create_lockfile .lock

				rm -rf cache/chroot

				mkdir -p cache

				cp -a chroot cache/chroot

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