Add to dist-git the scripts we use for mass-branching

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

roles/distgit/files/mass-branching-git.py

@@ -0,0 +1,79 @@
+#!/usr/bin/python
+
+"""
+This script is meant to be run in pkgs01.stg or pkgs02 (ie the dist-git
+servers) and will be adding the specified new git branch to the specified
+git repositories.
+
+Basically the script takes two inputs, the new branch name (for example
+f28, f29, epel8....) and a file containing the namespace/name of all the
+git repositories for which that branch should be created.
+
+"""
+from __future__ import print_function
+
+import argparse
+import os
+import subprocess
+import sys
+
+_base_path = '/srv/git/repositories'
+_branch_from = 'master'
+
+
+def _get_arguments():
+    """ Set and retrieve the command line arguments. """
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        'gitbranch',
+        help='The new git branch to create')
+    parser.add_argument(
+        'inputfile',
+        help='The input file listing the repositories to update')
+
+    return parser.parse_args()
+
+
+def create_git_branch(path, gitbranch):
+    """ Create the specified git branch in the specified git repository. """
+    cmd = ['git', 'branch', gitbranch, _branch_from]
+    return subprocess.check_output(
+        cmd, stderr=subprocess.STDOUT, shell=False, cwd=path)
+
+
+def main():
+    """ Main function of the program. """
+
+    args = _get_arguments()
+
+    if not os.path.isfile(args.inputfile):
+        print('%s does not appear to be a file' % args.inputfile)
+        return 1
+
+    with open(args.inputfile) as stream:
+        data = [row.strip() for row in stream]
+
+    if not data:
+        print('%s appears to be empty' % args.inputfile)
+        return 1
+
+    for entry in sorted(data):
+        if entry.startswith('rpm/'):
+            entry = 'rpms/%s' % entry[4:]
+        elif entry.startswith('module/'):
+            entry = 'modules/%s' % entry[7:]
+
+        path = os.path.join(_base_path, '%s.git' % entry)
+        print('Processing %s' % path)
+        try:
+            create_git_branch(path, args.gitbranch)
+        except subprocess.CalledProcessError as err:
+            print(
+                '  ERROR: %s failed to branch, return code: %s\n      %s' % (
+                    err.returncode, err.output))
+
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())