NaCl: Add script for finding which revisions are OK to use in DEPS

build/find_nacl_irt_revisions.py

Index: build/find_nacl_irt_revisions.py
diff --git a/build/find_nacl_irt_revisions.py b/build/find_nacl_irt_revisions.py
new file mode 100644
index 0000000000000000000000000000000000000000..3793730d57195d296a773f10844fe90551c99e1c
--- /dev/null
+++ b/build/find_nacl_irt_revisions.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# XXX: this isn't in the standard library
+import httplib2
+
+
+# XXX: share these with download_nacl_irt.py
+archs = ['x86_32', 'x86_64']
+
+base_url = 'http://commondatastorage.googleapis.com/nativeclient-archive2/irt'
+
+
+def UrlExists(url):
+  response, data = httplib2.Http().request(url, 'HEAD')
+  return response.status == 200
+
+
+def Main():
+  rev = 5456 # XXX: should query this from SVN
+  while True:
+    available_archs = []
+    for arch in archs:
+      url = '%s/r%s/irt_%s.nexe' % (base_url, rev, arch)
+      if UrlExists(url):
+        available_archs.append(arch)
+    if available_archs == archs:
+      status = 'complete'
+    else:
+      status = 'incomplete'
+    print rev, status, available_archs
+    rev -= 1
+
+
+if __name__ == '__main__':
+  Main()