Added prune only option + added check to borgprune def

Signed-off-by: Kristián Feldsam <feldsam@gmail.com>

backup.py

@@ -18,8 +18,9 @@ parser.add_argument('-S', '--startImage', help='Image id to start backup from. B
 parser.add_argument('-a', '--datastore', help='Datastore id or comma separated list of datastore ids to backup from. Omit to backup from all datastores to backup', type=functions.list_of_int_arg)
 parser.add_argument('-l', '--label', help='Label or comma separated list of labels of tagged images', type=functions.list_arg)
 parser.add_argument('-e', '--exclude', help='Skip (exclude) by label or comma separated list of labels of tagged images', type=functions.list_arg)
-parser.add_argument('-D', '--deployments', help='Backup also deployments files from system datastores', action='store_true')
-parser.add_argument('-d', '--dryRun', help='Dry run - not execute any commands, all cmds will be just printed', action='store_true')
+parser.add_argument('-P', '--pruneOnly', help='Don\'t backup anything, just prune old backups', action='store_true')
+parser.add_argument('-D', '--deployments', help='Not implemented yet! Backup also deployments files from system datastores', action='store_true')
+parser.add_argument('-d', '--dryRun', help='Not implemented yet! Dry run - not execute any commands, all cmds will be just printed', action='store_true')
 parser.add_argument('-v', '--verbose', help='Verbose mode', action='store_true')
 
 # -------------------------------------
@@ -41,7 +42,8 @@ from drivers import _3par
 _3par.login()
 
 # starting backup
-functions.send_email('Backup started! Images count: %d' % len(images))
+if not args.pruneOnly:
+    functions.send_email('Backup started! Images count: %d' % len(images))
 
 for image_key in images:
     image = images[image_key]
@@ -51,6 +53,15 @@ for image_key in images:
     if datastore.TM_MAD != '3par':
         continue
 
+    # prune only?
+    if args.pruneOnly:
+        try:
+            _3par.prune(image, args.verbose)
+        except Exception as ex:
+            print ex
+            functions.send_email('Error prune image %d:%s: "%s"' % (image.ID, image.NAME, ex))
+        continue
+
     # mark start of backup in verbose output
     if args.verbose:
         print '#============================================================'

drivers/_3par.py

 import os
+import re
 import subprocess
 import sys
 import time
@@ -224,6 +225,18 @@ def backup(image, verbose):
         print result
 
 
+def prune(image, verbose):
+    # get source name and wwn
+    name, wwn = vv_name_wwn(image.SOURCE)
+
+    # prune old backups
+    if verbose:
+        print 'Pruning old backups...'
+    result = borgprune(name)
+    if verbose:
+        print result
+
+
 def borgbackup(name, dev, size_mb):
     size = size_mb*1024*1024
 
@@ -234,6 +247,10 @@ def borgbackup(name, dev, size_mb):
 
 
 def borgprune(name):
+    # check if name is defined, prevent deleting more that we want
+    if not re.match('^feldcloud\.one\.[0-9]+\.vv$', name):
+        raise Exception('Can not run borg prune!', 'Name doesn\'t match pattern. Should be in format feldcloud.one.[0-9]+.vv, given "%s"' % name)
+
     try:
         return subprocess.check_output('borg prune -v --list --stats --keep-daily=7 --keep-weekly=4 --keep-monthly=6 --prefix=%s %s' % (name, config.BACKUP_REPO), shell=True)
     except subprocess.CalledProcessError as ex: