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