Add infrastructure to download golang and build AppRTC collider.

download_appengine_and_mercurial.py

Index: download_appengine_and_mercurial.py
===================================================================
--- download_appengine_and_mercurial.py	(revision 293261)
+++ download_appengine_and_mercurial.py	(working copy)
@@ -10,15 +10,14 @@
 file is. This is what should happen if this script is invoked as a hook action.
 """
 
-import hashlib
+import glob
 import os
-import shutil
 import sys
 import subprocess
-import zipfile
 
+import utils
 
-def _DownloadAppEngineZipFile(webrtc_deps_path):
+def _DownloadResources(webrtc_deps_path):
   print 'Downloading files in %s...' % webrtc_deps_path
 
   extension = 'bat' if 'win32' in sys.platform else 'py'
@@ -28,50 +27,33 @@
   subprocess.check_call(cmd)
 
 
-def _ComputeSHA1(path):
-  if not os.path.exists(path):
-    return 0
+def _StripVersionNumberFromMercurialFolder():
+  unpacked_name = glob.glob('mercurial*')
+  assert len(unpacked_name) == 1, 'Should have precisely one mercurial!'
+  os.rename(unpacked_name[0], 'mercurial')
 
-  sha1 = hashlib.sha1()
-  file_to_hash = open(path, 'rb')
-  try:
-    sha1.update(file_to_hash.read())
-  finally:
-    file_to_hash.close()
 
-  return sha1.hexdigest()
-
-
-# This is necessary since Windows won't allow us to unzip onto an existing dir.
-def _DeleteOldAppEngineDir():
-  app_engine_dir = 'google_appengine'
-  print 'Deleting %s in %s...' % (app_engine_dir, os.getcwd())
-  shutil.rmtree(app_engine_dir, ignore_errors=True)
-
-
-def _Unzip(path):
-  print 'Unzipping %s in %s...' % (path, os.getcwd())
-  zip_file = zipfile.ZipFile(path)
-  try:
-    zip_file.extractall()
-  finally:
-    zip_file.close()
-
-
 def main(argv):
   if len(argv) == 1:
     return 'Usage: %s <path to webrtc.DEPS>' % argv[0]
 
   webrtc_deps_path = argv[1]
-  zip_path = os.path.join(webrtc_deps_path, 'google-appengine.zip')
-  old_zip_sha1 = _ComputeSHA1(zip_path)
+  appengine_zip_path = os.path.join(webrtc_deps_path, 'google-appengine.zip')
+  old_appengine_sha1 = utils.ComputeSHA1(appengine_zip_path)
 
-  _DownloadAppEngineZipFile(webrtc_deps_path)
+  mercurial_tar_path = os.path.join(webrtc_deps_path, 'mercurial-src.tar.gz')
+  old_mercurial_sha1 = utils.ComputeSHA1(mercurial_tar_path)
 
-  if old_zip_sha1 != _ComputeSHA1(zip_path):
-    _DeleteOldAppEngineDir()
-    _Unzip(zip_path)
+  _DownloadResources(webrtc_deps_path)
 
+  if old_appengine_sha1 != utils.ComputeSHA1(appengine_zip_path):
+    utils.DeleteDirNextToGclient('google_appengine')
+    utils.UnpackToWorkingDir(appengine_zip_path)
 
+  if old_mercurial_sha1 != utils.ComputeSHA1(mercurial_tar_path):
+    utils.DeleteDirNextToGclient('mercurial')
+    utils.UnpackToWorkingDir(mercurial_tar_path)
+    _StripVersionNumberFromMercurialFolder()
+
 if __name__ == '__main__':
   sys.exit(main(sys.argv))