resilient: add script to be used as a backup_identity_file

It can exclude directories from the hash computation, which may
be handy for more than one software release.
Its first application will be to exclude logrotated logs from the signature
file, and the zodb backup, as they integrate their own integrity mechanisme

setup.py

@@ -113,6 +113,7 @@ setup(name=name,
           'rdiffbackup.genstatrss = slapos.resilient.rdiffBackupStat2RSS:main',
           'runner-exporter = slapos.resilient.runner_exporter:runExport',
           'runner-importer-post-notification-run = slapos.resilient.runner_importer:postNotificationRun',
+          'backup-identity-script-excluding-path = slapos.resilient.identity_script_excluding_path:calculateSignature',
           'securedelete = slapos.securedelete:main',
           'slapos-kill = slapos.systool:kill',
           'slaprunnertest = slapos.runner.runnertest:main',

slapos/resilient/identity_script_excluding_path.py

+from __future__ import print_function
+
+import argparse
+import os
+import subprocess
+import re
+
+from .runner_utils import *
+
+def parseArgumentList():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--exclude-path', action='append', required=True)
+
+  return parser.parse_args()
+
+def calculateSignature():
+  args = parseArgumentList()
+
+  file_list = sys.stdin.read()
+  file_list = file_list.split('\0')
+
+  if not len(file_list):
+    return 0
+
+  result = re.match('^\.\/runner\/instance\/slappart(\d)', file_list[0])
+  base_relative_path = result.group()
+  excluded_path_list = tuple(['./' + os.path.relpath(os.path.join(base_relative_path, path)) for path in args.exclude_path])
+
+  filtered_file_list = [
+    x for x in file_list
+    if not x.startswith(excluded_path_list)
+  ]
+
+  print('\n'.join(getSha256Sum(filtered_file_list)))
\ No newline at end of file