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diff --git a/tools/hook-scripts/validate-extensions.py b/tools/hook-scripts/validate-extensions.py
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+++ b/tools/hook-scripts/validate-extensions.py
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+#!/usr/bin/env python
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+#
+
+"""\
+Check that any files pending commit into a Subversion repository have
+suitable file extensions, printing an error and exiting with an
+errorful value if any files fail validation.  This is intended to be
+used as a Subversion pre-commit hook script.
+
+Syntax 1:
+
+   validate-extensions.py REPOS_PATH TXN_NAME deny EXT [...]
+
+   Ensure that any newly added files do *not* have one of the provided
+   file extensions.
+
+
+Syntax 2:
+
+   validate-extensions.py REPOS_PATH TXN_NAME allow EXT [...]
+
+   Ensure that any newly added files *do* have one of the provided
+   file extensions.  (Extension-less files are disallowed.)
+
+"""
+
+import sys
+import os
+from svn import repos, fs, core
+
+def validate_added_extensions(repos_path, txn_name, extensions, action):
+  # Open the repository and transaction.
+  fs_ptr = repos.fs(repos.open(repos_path))
+  txn_t = fs.open_txn(fs_ptr, txn_name)
+  txn_root = fs.txn_root(txn_t)
+
+  # Fetch the changes made in this transaction.
+  changes = fs.svn_fs_paths_changed(txn_root)
+  paths = changes.keys()
+
+  # Check the changes.
+  for path in paths:
+    change = changes[path]
+
+    # Always allow deletions.
+    if change.change_kind == fs.path_change_delete:
+      continue
+
+    # Always allow non-files.
+    kind = fs.check_path(txn_root, path)
+    if kind != core.svn_node_file:
+      continue
+
+    # If this was a newly added (without history) file ...
+    if ((change.change_kind == fs.path_change_replace) \
+        or (change.change_kind == fs.path_change_add)):
+      copyfrom_rev, copyfrom_path = fs.copied_from(txn_root, path)
+      if copyfrom_rev == core.SVN_INVALID_REVNUM:
+
+        # ... then check it for a valid extension.
+        base, ext = os.path.splitext(path)
+        if ext:
+          ext = ext[1:].lower()
+        if ((ext in extensions) and (action == 'deny')) \
+           or ((ext not in extensions) and (action == 'allow')):
+          sys.stderr.write("Path '%s' has an extension disallowed by server "
+                           "configuration.\n" % (path))
+          sys.exit(1)
+
+def usage_and_exit(errmsg=None):
+  stream = errmsg and sys.stderr or sys.stdout
+  stream.write(__doc__)
+  if errmsg:
+    stream.write("ERROR: " + errmsg + "\n")
+  sys.exit(errmsg and 1 or 0)
+
+def main():
+  argc = len(sys.argv)
+  if argc < 5:
+    usage_and_exit("Not enough arguments.")
+  repos_path = sys.argv[1]
+  txn_name = sys.argv[2]
+  action = sys.argv[3]
+  if action not in ("allow", "deny"):
+    usage_and_exit("Invalid action '%s'.  Expected either 'allow' or 'deny'."
+                   % (action))
+  extensions = [x.lower() for x in sys.argv[4:]]
+  validate_added_extensions(repos_path, txn_name, extensions, action)
+
+if __name__ == "__main__":
+  main()