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create a lock file during builds

Browse source 
prevent duplicate main instances of the build
system from running

the lock file is deleted when the parent process
exits, alongside the tmpdir deletion

the build system must only ever be run ot one
instance at a time, per work directory

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe 2024-06-09 15:37:13 +01:00 • committed by Leah Rowe
parent b6dc23bc67
commit f1caf89a28
3 changed files with 13 additions and 9 deletions

1
.gitignore vendored
View file

@ -24,3 +24,4 @@
/src/
/CHANGELOG
/todo.txt
/lock

4
build
View file

@ -119,7 +119,8 @@ fetch_trees()
fail()
{
tmp_cleanup || printf "WARNING: can't rm tmpdir: %s\n" "$tmpdir" 1>&2
tmp_cleanup || printf "WARNING: can't rm tmp files: %s\n" "$tmpdir" \
1>&2
err_ "${1}"
}
@ -127,6 +128,7 @@ tmp_cleanup()
{
[ "$tmpdir_was_set" = "n" ] || return 0
rm -Rf "$tmpdir" || return 1
rm -f lock || return 1
}
main $@

17
include/lib.sh
View file

@ -65,27 +65,28 @@ install_packages()
id -u 1>/dev/null 2>/dev/null || $err "suid check failed (id -u)"
[ "$(id -u)" != "0" ] || $err "this command as root is not permitted"
# if "y": a coreboot target won't be built if target.cfg says release="n"
# (this is used to exclude certain build targets from releases)
[ -z "${XBMK_RELEASE+x}" ] && xbmk_release="n"
[ -z "$xbmk_release" ] && xbmk_release="$XBMK_RELEASE"
[ "$xbmk_release" = "n" ] || [ "$xbmk_release" = "y" ] || xbmk_release="n"
export XBMK_RELEASE="$xbmk_release"
[ -z "${TMPDIR+x}" ] && tmpdir_was_set="n"
if [ "$tmpdir_was_set" = "y" ]; then
[ "${TMPDIR%_*}" = "/tmp/xbmk" ] || tmpdir_was_set="n"
fi
if [ "$tmpdir_was_set" = "n" ]; then
[ -f "lock" ] && $err "The 'lock' file exists. Is a build running?"
export TMPDIR="/tmp"
tmpdir="$(mktemp -d -t xbmk_XXXXXXXX)"
export TMPDIR="$tmpdir"
touch lock || $err "cannot create 'lock' file"
else
export TMPDIR="$TMPDIR"
tmpdir="$TMPDIR"
fi
# if "y": a coreboot target won't be built if target.cfg says release="n"
# (this is used to exclude certain build targets from releases)
[ -z "${XBMK_RELEASE+x}" ] && xbmk_release="n"
[ -z "$xbmk_release" ] && xbmk_release="$XBMK_RELEASE"
[ "$xbmk_release" = "n" ] || [ "$xbmk_release" = "y" ] || xbmk_release="n"
export XBMK_RELEASE="$xbmk_release"
[ -z "${XBMK_THREADS+x}" ] || threads="$XBMK_THREADS"
[ -z "$threads" ] && threads=1
expr "X$threads" : "X-\{0,1\}[0123456789][0123456789]*$" \