live-build/scripts/build/lb_chroot_dpkg_tmpfs

#!/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
. "${LB_BASE:-/usr/share/live/build}"/scripts/build.sh

# Setting static variables
DESCRIPTION="$(Echo 'manage /var/lib/dpkg')"
HELP=""
USAGE="${PROGRAM} {install|remove} [--force]"

Arguments "${@}"

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

# Requiring stage file
Require_stagefile .stage/config .stage/bootstrap

case "${1}" in
	install)
		Echo_message "Configuring tmpfs for /var/lib/dpkg"

		# Checking stage file
		Check_stagefile .stage/chroot_dpkg_tmpfs

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		mv chroot/var/lib/dpkg chroot/var/lib/dpkg.tmp
		mkdir chroot/var/lib/dpkg
		mount -t tmpfs tmpfs chroot/var/lib/dpkg
		mv chroot/var/lib/dpkg.tmp/* chroot/var/lib/dpkg
		rm -rf chroot/var/lib/dpkg.tmp

		# Creating stage file
		Create_stagefile .stage/chroot_dpkg_tmpfs
		;;

	remove)
		Echo_message "Deconfiguring tmpfs for /var/lib/dpkg"

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		mkdir -p chroot/var/lib/dpkg.tmp
		mv chroot/var/lib/dpkg/* chroot/var/lib/dpkg.tmp
		umount chroot/var/lib/dpkg
		rm -rf chroot/var/lib/dpkg
		mv chroot/var/lib/dpkg.tmp chroot/var/lib/dpkg

		# Removing stage file
		rm -f .stage/chroot_dpkg_tmpfs
		;;

	*)
		Usage
		;;
esac