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#!/bin/sh
## live-build(7) - System Build Scripts
## Copyright (C) 2016-2020 The Debian Live team
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## 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.
Acquire_lockfile ()
{
local FILE="${1:-.lock}"
Check_lockfile "${FILE}"
Create_lockfile "${FILE}"
}
Check_lockfile ()
{
local FILE="${1}"
if [ -f "${FILE}" ]; then
Echo_error "${PROGRAM} already locked"
exit 1
fi
}
Create_lockfile ()
{
local FILE="${1}"
# Create lock trap
# This automatically removes the lock file in certain conditions
trap 'ret=${?}; '"rm -f \"${FILE}\";"' exit ${ret}' EXIT HUP INT QUIT TERM
# Creating lock file
touch "${FILE}"
}
Remove_lockfile ()
{
local FILE="${1:-.lock}"
rm -f "${FILE}"
}
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