diff --git a/synapse/util/versionstring.py b/synapse/util/versionstring.py
new file mode 100644
index 0000000000..a4f156cb3b
--- /dev/null
+++ b/synapse/util/versionstring.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# Copyright 2016 OpenMarket Ltd
+#
+# 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.
+
+import subprocess
+import os
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def get_version_string(name, module):
+ try:
+ null = open(os.devnull, 'w')
+ cwd = os.path.dirname(os.path.abspath(module.__file__))
+ try:
+ git_branch = subprocess.check_output(
+ ['git', 'rev-parse', '--abbrev-ref', 'HEAD'],
+ stderr=null,
+ cwd=cwd,
+ ).strip()
+ git_branch = "b=" + git_branch
+ except subprocess.CalledProcessError:
+ git_branch = ""
+
+ try:
+ git_tag = subprocess.check_output(
+ ['git', 'describe', '--exact-match'],
+ stderr=null,
+ cwd=cwd,
+ ).strip()
+ git_tag = "t=" + git_tag
+ except subprocess.CalledProcessError:
+ git_tag = ""
+
+ try:
+ git_commit = subprocess.check_output(
+ ['git', 'rev-parse', '--short', 'HEAD'],
+ stderr=null,
+ cwd=cwd,
+ ).strip()
+ except subprocess.CalledProcessError:
+ git_commit = ""
+
+ try:
+ dirty_string = "-this_is_a_dirty_checkout"
+ is_dirty = subprocess.check_output(
+ ['git', 'describe', '--dirty=' + dirty_string],
+ stderr=null,
+ cwd=cwd,
+ ).strip().endswith(dirty_string)
+
+ git_dirty = "dirty" if is_dirty else ""
+ except subprocess.CalledProcessError:
+ git_dirty = ""
+
+ if git_branch or git_tag or git_commit or git_dirty:
+ git_version = ",".join(
+ s for s in
+ (git_branch, git_tag, git_commit, git_dirty,)
+ if s
+ )
+
+ return (
+ "%s/%s (%s)" % (
+ name, module.__version__, git_version,
+ )
+ ).encode("ascii")
+ except Exception as e:
+ logger.info("Failed to check for git repository: %s", e)
+
+ return ("%s/%s" % (name, module.__version__,)).encode("ascii")
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