+option "pre-remove-hook" -
+#~~~~~~~~~~~~~~~~~~~~~~~~~~
+"Executed before snapshot removal"
+string typestr="command"
+optional
+details="
+ Execute this command before removing a snapshot. The full
+ path to the snapshot about to be deleted is passed to the
+ command as the first argument. If the command returns with
+ a non-zero exit status, no snapshot is being removed and the
+ operation is retried later.
+
+ For example, one might want to execute a script that checks
+ whether the snapshot to be deleted is currently used by
+ another process, e.g. by a tape-based backup system that runs
+ concurrently to dss.
+
+ Another possible application of this is to record disk-usage
+ patterns before and after snapshot removal.
+"
+
+option "post-remove-hook" -
+#~~~~~~~~~~~~~~~~~~~~~~~~~~
+"Executed after snapshot removal"
+string typestr="command"
+optional
+details="
+ Execute this after a snapshot has successfully been removed. As
+ for the pre-remove hook, the full path of the removed snapshot
+ is passed to the hook as the first argument. The exit code
+ of this hook is ignored.
+"
+