backup: configurable cleanup sequence

$delete_before_dump controls whether old backups to be removed before
creating new one.

manifests/backup.pp

@@ -8,6 +8,7 @@
 #   [*backupdir*]      - The target directory of the mysqldump.
 #   [*backupcompress*] - Boolean to compress backup with bzip2.
 #   [*backuprotate*]   - Number of backups to keep. Default 30
+#   [*delete_before_dump*] - Clean existing backups before creating new
 #
 # Actions:
 #   GRANT SELECT, RELOAD, LOCK TABLES ON *.* TO 'user'@'localhost'
@@ -30,6 +31,7 @@ class mysql::backup (
   $backupdir,
   $backupcompress = true,
   $backuprotate = 30,
+  $delete_before_dump = false,
   $ensure = 'present'
 ) {
 

templates/mysqlbackup.sh.erb

@@ -22,10 +22,21 @@ PATH=/usr/bin:/usr/sbin:/bin:/sbin
 
 set -o pipefail
 
+cleanup()
+{
+    find "${DIR}/" -maxdepth 1 -type f -name "${PREFIX}*.sql*" -mtime +${ROTATE} -print0 | xargs -0 -r rm -f
+}
+
+<% if @delete_before_dump -%>
+cleanup
+
+<% end -%>
 mysqldump -u${USER} -p${PASS} --opt --flush-logs --single-transaction \
  --all-databases <% if @backupcompress %>| bzcat -zc <% end %>> ${DIR}/${PREFIX}`date +%Y%m%d-%H%M%S`.sql<% if @backupcompress %>.bz2<% end  %>
 
+<% if not @delete_before_dump -%>
 if [ $? -eq 0 ] ; then
-    find "${DIR}/" -maxdepth 1 -type f -name "${PREFIX}*.sql*" -mtime +${ROTATE} -print0 | xargs -0 -r rm -f
+    cleanup
 fi
+<% end -%>