X-Git-Url: http://git.tuebingen.mpg.de/?p=dss.git;a=blobdiff_plain;f=dss.ggo;h=3133d037dc4f8a6ed5f035bd180e29b8d32597ad;hp=1772b99da180cfa4029c258768cd4015dac88ca8;hb=442d1920cb866fb6e0a816d7e175b5cdb8c0e1a8;hpb=77af1d7b83a25780610bab1d6292324610eb2069

diff --git a/dss.ggo b/dss.ggo
index 1772b99..3133d03 100644
--- a/dss.ggo
+++ b/dss.ggo
@@ -195,8 +195,12 @@ string typestr="option"
 optional
 multiple
 details="
-	These option may be given multiple times. The arguments passed
-	to that option are passed verbatim to the rsync command.
+	This option may be given multiple times. The given argument is
+	passed verbatim to the rsync command. Note that in order to use
+	rsync options that require an argument, you have to specify the
+	option and its argument as separate --rsync-options, like this:
+
+		--rsync-option --exclude --rsync-option /proc
 "
 
 ###################
@@ -273,6 +277,39 @@ details="
 	store them in a database for further analysis.
 "
 
+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.
+"
+
 option "exit-hook" e
 #~~~~~~~~~~~~~~~~~~~
 "Executed if run command exits"