rdiff: handle "keep = yes" to disable old backups removal (Closes: #424633)

ChangeLog

@@ -23,6 +23,7 @@ version 0.9.5 -- unreleased
 	   (Closes: #396578)
 	rdiff:
 	 . Added cstream support to allow for bandwidth limiting
+	 . Handle "keep = yes" to disable old backups removal (Closes: #424633)
 	rub
 	 . Fixed typo in rub handler that caused it to not work
 	 . Changed to use lib/vserver code

examples/example.rdiff

@@ -38,6 +38,8 @@ type = local
 
 # how many days of data to keep
 # (you can also use the time format of rdiff-backup, e.g. 6D5h)
+# (to keep everything, set this to yes)
+#keep = yes
 keep = 60
 
 # A few notes about includes and excludes:

handlers/rdiff

@@ -152,6 +152,8 @@ esac
 	
 ### REMOVE OLD BACKUPS ###
 
+if [ "$keep" != yes ]; then
+
    if [ "`echo $keep | tr -d 0-9`" == "" ]; then
 	# add D if no other date unit is specified
       keep="${keep}D"
@@ -175,6 +177,8 @@ if [ $test = 0 ]; then
       fi
    fi
 
+fi
+
 # Add cstream 
 
 if [ ! -z $bwlimit ]; then