Make history_event-zfs-list-cacher.s h manually callable

gistfile1.txt

--- history_event-zfs-list-cacher.sh.orig	2018-04-19 22:44:25.000000000 +0200
+++ history_event-zfs-list-cacher.sh	2018-04-21 13:49:50.033360793 +0200
@@ -10,11 +10,20 @@
 # If the pool specific cache file is not writeable, abort
 [ -w "${FSLIST}" ] || exit 0
 
-[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
-. "${ZED_ZEDLET_DIR}/zed-functions.sh"
-
-zed_exit_if_ignoring_this_event
-zed_check_cmd "${ZFS}" sort diff grep
+if [ ${#} -eq 0 ]; then
+    [ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
+    . "${ZED_ZEDLET_DIR}/zed-functions.sh"
+
+    zed_exit_if_ignoring_this_event
+    zed_check_cmd "${ZFS}" sort diff grep
+else
+    if [ ${#} -ne 1 ]; then
+	echo "To many arguments" 1>&2
+	exit 1
+    fi
+    ZEVENT_POOL=$1
+    ZFS="$(which zfs)"
+fi
 
 # If we are acting on a snapshot, we have nothing to do
 printf '%s' "${ZEVENT_HISTORY_DSNAME}" | grep '@' && exit 0
@@ -52,13 +61,17 @@
       ;;
 
     *)
-        # Ignore all other events.
+        # Ignore all other events unless called manually.
+	if [ ${#} -eq 0 ]; then
         exit 0
+	fi
       ;;
 esac
 
-zed_lock zfs-list
-trap abort_alter EXIT
+if [ ${#} -eq 0 ]; then
+    zed_lock zfs-list
+    trap abort_alter EXIT
+fi
 
 "${ZFS}" list -H -tfilesystem -oname,mountpoint,canmount -r "${ZEVENT_POOL}" \
     >"${FSLIST_TMP}"
@@ -66,8 +79,14 @@
 # Sort the output so that it is stable
 sort "${FSLIST_TMP}" -o "${FSLIST_TMP}"
 
-# Don't modify the file if it hasn't changed
-diff -q "${FSLIST_TMP}" "${FSLIST}" || mv "${FSLIST_TMP}" "${FSLIST}"
-rm -f "${FSLIST_TMP}"
 
-finished
+if [ ${#} -eq 0 ]; then
+    # Don't modify the file if it hasn't changed
+    diff -q "${FSLIST_TMP}" "${FSLIST}" || mv "${FSLIST_TMP}" "${FSLIST}"
+    rm -f "${FSLIST_TMP}"
+
+    finished
+else
+    cat "${FSLIST_TMP}"
+    rm -f "${FSLIST_TMP}"
+fi