dup: fix incorrect duplicity version check for keepincroffulls.

Thanks to Olivier Berger <oberger@ouvaton.org> for the patch.
(Closes Redmine bug #3443)
(Closes: #641120)

ChangeLog

@@ -2,6 +2,10 @@ version 0.9.10 -- UNRELEASED
     handler changes:
 	dup:
 	 . Cleanup: stop supporting duplicity < 0.6.01 (Redmine#2538).
+	 . Fix incorrect duplicity version check for keepincroffulls.
+	   Thanks to Olivier Berger <oberger@ouvaton.org> for the patch.
+	   (Closes Redmine bug #3443)
+	   (Closes: #641120)
 	rsync:
 	 . Fixing $rsync_options output when rsync is local
 	   (Closes Redmine bug #3001)

handlers/dup.in

@@ -275,7 +275,7 @@ fi
 # remove-all-inc-of-but-n-full : remove increments of older full backups : only keep latest ones
 if [ "$keep" != "yes" ]; then
    if [ "$keepincroffulls" != "all" ]; then
-      if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 9 -a "$duplicity_sub" -ge 10 ]; then
+      if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 6 -a "$duplicity_sub" -ge 10 ]; then
          debug "$precmd duplicity remove-all-inc-of-but-n-full $keepincroffulls --force $execstr_options $execstr_serverpart"
          if [ ! $test ]; then
             export PASSPHRASE=$password