Helper script to update API version in plugin archetype pom files

Running the script in the root of the Gerrit folder:

  ./tools/version NEW_VERSION

will replace the value in the first occurrence of the <version> tag
in the plugin archetype pom files with the value specified by
NEW_VERSION.

Change-Id: I9f529852af22a1eef7f30e2fcaea8acea28057d9

tools/version.py

@@ -0,0 +1,49 @@
+#!/usr/bin/python
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+from optparse import OptionParser
+import os.path
+import re
+import sys
+
+parser = OptionParser()
+opts, args = parser.parse_args()
+
+if not len(args):
+  parser.error('not enough arguments')
+elif len(args) > 1:
+  parser.error('too many arguments')
+
+new_version = args[0]
+pattern = re.compile(r'(\s*)<version>[-.\w]+</version>')
+
+for project in ['gerrit-plugin-archetype', 'gerrit-plugin-gwt-archetype',
+                'gerrit-plugin-gwtui', 'gerrit-plugin-js-archetype']:
+  pom = os.path.join(project, 'pom.xml')
+  try:
+    outxml = ""
+    found = False
+    for line in open(pom, "r"):
+      m = pattern.match(line)
+      if m and not found:
+        outxml += "%s<version>%s</version>\n" % (m.group(1), new_version)
+        found = True
+      else:
+        outxml += line
+    with open(pom, "w") as outfile:
+      outfile.write(outxml)
+  except IOError as err:
+    print('error updating %s: %s' % (pom, err), file=sys.stderr)