Force migrate all clients from multi-install back to single-install.

chrome/test/mini_installer/make_chrome_multi.py

Index: chrome/test/mini_installer/make_chrome_multi.py
diff --git a/chrome/test/mini_installer/make_chrome_multi.py b/chrome/test/mini_installer/make_chrome_multi.py
new file mode 100644
index 0000000000000000000000000000000000000000..8910a45326a1ba97678a42760cfcbef258a1d23f
--- /dev/null
+++ b/chrome/test/mini_installer/make_chrome_multi.py
@@ -0,0 +1,79 @@
+# Copyright 2016 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.
+
+"""Makes an existing per-user Chrome appear to be multi-install Chrome.
+
+This script makes minimal mutations to the Windows registry to make ordinary
+single-install Chrome appear to be multi-install for purposes of testing multi-
+to single- migrations.
+"""
+
+import _winreg
+import argparse
+import sys
+
+
+def MakeChromeMulti(chrome_long_name, chrome_clients_key,
+                    chrome_client_state_key, binaries_clients_key):
+  # Update the control panel's uninstall string.
+  key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER,
+                        ('Software\\Microsoft\\Windows\\CurrentVersion\\'
+                         'Uninstall\\%s' % chrome_long_name), 0,
+                        _winreg.KEY_QUERY_VALUE | _winreg.KEY_SET_VALUE |
+                        _winreg.KEY_WOW64_32KEY)
+  string = _winreg.QueryValueEx(key, 'UninstallString')[0]
+  string = string.replace('--uninstall', '--uninstall --multi-install --chrome')
+  _winreg.SetValueEx(key, 'UninstallString', 0, _winreg.REG_SZ, string)
+
+  # Read Chrome's version number.
+  key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER,
+                        chrome_clients_key, 0,
+                        _winreg.KEY_QUERY_VALUE | _winreg.KEY_WOW64_32KEY)
+  pv = _winreg.QueryValueEx(key, 'pv')[0]
+  _winreg.CloseKey(key)
+
+  # Write that version for the binaries.
+  key = _winreg.CreateKeyEx(_winreg.HKEY_CURRENT_USER,
+                            binaries_clients_key, 0,
+                            _winreg.KEY_SET_VALUE | _winreg.KEY_WOW64_32KEY)
+  _winreg.SetValueEx(key, 'pv', 0, _winreg.REG_SZ, pv)
+  _winreg.CloseKey(key)
+
+  # Add "--multi-install --chrome" to Chrome's UninstallArguments.
+  key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER,
+                        chrome_client_state_key, 0,
+                        _winreg.KEY_QUERY_VALUE | _winreg.KEY_SET_VALUE |
+                        _winreg.KEY_WOW64_32KEY)
+  args = _winreg.QueryValueEx(key, 'UninstallArguments')[0]
+  args += ' --multi-install --chrome'
+  _winreg.SetValueEx(key, 'UninstallArguments', 0, _winreg.REG_SZ, args)
+
+
+def main():
+  parser = argparse.ArgumentParser(
+    description='Transforms single-install Chrome into multi-install.')
+  parser.add_argument('--chrome-long-name', default='Google Chrome',
+                      help='The full name of the product.')
+  parser.add_argument('--chrome-clients-key',
+                      default='Software\\Google\\Update\\Clients\\'
+                      '{8A69D345-D564-463c-AFF1-A69D9E530F96}',
+                      help='Chrome\'s Clients registry key path.')
+  parser.add_argument('--chrome-client-state-key',
+                      default='Software\\Google\\Update\\ClientState\\'
+                      '{8A69D345-D564-463c-AFF1-A69D9E530F96}',
+                      help='Chrome\'s ClientState registry key path.')
+  parser.add_argument('--binaries-clients-key',
+                      default='Software\\Google\\Update\\Clients\\'
+                      '{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}',
+                      help='Chrome Binaries\' Clients registry key path.')
+  args = parser.parse_args()
+  MakeChromeMulti(args.chrome_long_name,
+                  args.chrome_clients_key,
+                  args.chrome_client_state_key,
+                  args.binaries_clients_key)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())