live-build/functions/lockfile.sh

#!/bin/sh

# lockfile.sh - handle lock files
# 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

Check_lockfile ()
{
	FILE="${1}"

	# Checking lock file
	if [ -f "${FILE}" ]
	then
		Echo_error "system locked"
		exit 1
	fi
}

Create_lockfile ()
{
	if [ "${LH_FORCE}" != "enabled" ]
	then
		FILE="${1}"
		DIRECTORY="$(dirname ${1})"

		# Creating lock directory
		mkdir -p "${DIRECTORY}"

		# Creating lock trap
		trap 'ret=${?}; '"rm -f \"${FILE}\"; "'for FILESYSTEM in devpts proc sysfs; do lh_chroot_${FILESYSTEM} remove --force; done; exit ${ret}' EXIT

		# Creating lock file
		touch "${FILE}"
	fi
}