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[type/__package_opkg] Implement flock locking if available

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This commit is contained in:
Dennis Camera 2020-06-24 20:49:48 +02:00
commit 5364d3bc90
1 changed files with 36 additions and 19 deletions
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55
cdist/conf/type/__package_opkg/explorer/pkg_status
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@ -25,28 +25,45 @@
readonly __type_path=${__object%%${__object_id}*}
test -d "${__type_path}" || { echo 'Cannot determine __type_path' >&2; exit 1; }
readonly LOCKDIR="${__type_path:?}/.cdist_opkg.lock.dir"
readonly LOCKFILE="${__type_path:?}/.cdist_opkg.lock"
_lock() {
until mkdir "${LOCKDIR:?}" 2>/dev/null
do
while test -d "${LOCKDIR}"
if command -v flock >/dev/null 2>&1
then
# use flock (if available) on FD 9
_lock() {
exec 9<>"${LOCKFILE:?}"
flock -x 9
echo $$>&9
}
_unlock() {
:>"${LOCKFILE:?}"
flock -u 9
exec 9<&-
}
else
# fallback to mkdir if flock is missing
_lock() {
until mkdir "${LOCKFILE:?}.dir" 2>/dev/null
do
# DEBUG: printf 'Locked by PID: %u\n' "$(cat "${LOCKDIR}/pid")"
sleep 1
while test -d "${LOCKFILE}.dir"
do
# DEBUG:
# printf 'Locked by PID: %u\n' "$(cat "${LOCKFILE}.dir/pid")"
sleep 1
done
done
done
echo $$ >"${LOCKDIR:?}/pid"
}
_unlock() {
test -d "${LOCKDIR}" || return 0
if test -s "${LOCKDIR}/pid"
then
test "$(cat "${LOCKDIR}/pid")" = $$ || return 1
rm "${LOCKDIR:?}/pid"
fi
rmdir "${LOCKDIR:?}"
}
echo $$ >"${LOCKFILE:?}.dir/pid"
}
_unlock() {
test -d "${LOCKFILE}.dir" || return 0
if test -s "${LOCKFILE}.dir/pid"
then
test "$(cat "${LOCKFILE}.dir/pid")" = $$ || return 1
rm "${LOCKFILE:?}.dir/pid"
fi
rmdir "${LOCKFILE:?}.dir"
}
fi
if test -f "${__object}/parameter/name"