import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

media/webrtc/trunk/tools/gyp/test/lib/TestWin.py

@@ -0,0 +1,101 @@
+# Copyright (c) 2014 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+TestWin.py:  a collection of helpers for testing on Windows.
+"""
+
+import errno
+import os
+import re
+import sys
+import subprocess
+
+class Registry(object):
+  def _QueryBase(self, sysdir, key, value):
+    """Use reg.exe to read a particular key.
+
+    While ideally we might use the win32 module, we would like gyp to be
+    python neutral, so for instance cygwin python lacks this module.
+
+    Arguments:
+      sysdir: The system subdirectory to attempt to launch reg.exe from.
+      key: The registry key to read from.
+      value: The particular value to read.
+    Return:
+      stdout from reg.exe, or None for failure.
+    """
+    # Skip if not on Windows or Python Win32 setup issue
+    if sys.platform not in ('win32', 'cygwin'):
+      return None
+    # Setup params to pass to and attempt to launch reg.exe
+    cmd = [os.path.join(os.environ.get('WINDIR', ''), sysdir, 'reg.exe'),
+           'query', key]
+    if value:
+      cmd.extend(['/v', value])
+    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    # Get the stdout from reg.exe, reading to the end so p.returncode is valid
+    # Note that the error text may be in [1] in some cases
+    text = p.communicate()[0]
+    # Check return code from reg.exe; officially 0==success and 1==error
+    if p.returncode:
+      return None
+    return text
+
+  def Query(self, key, value=None):
+    r"""Use reg.exe to read a particular key through _QueryBase.
+
+    First tries to launch from %WinDir%\Sysnative to avoid WoW64 redirection. If
+    that fails, it falls back to System32.  Sysnative is available on Vista and
+    up and available on Windows Server 2003 and XP through KB patch 942589. Note
+    that Sysnative will always fail if using 64-bit python due to it being a
+    virtual directory and System32 will work correctly in the first place.
+
+    KB 942589 - http://support.microsoft.com/kb/942589/en-us.
+
+    Arguments:
+      key: The registry key.
+      value: The particular registry value to read (optional).
+    Return:
+      stdout from reg.exe, or None for failure.
+    """
+    text = None
+    try:
+      text = self._QueryBase('Sysnative', key, value)
+    except OSError, e:
+      if e.errno == errno.ENOENT:
+        text = self._QueryBase('System32', key, value)
+      else:
+        raise
+    return text
+
+  def GetValue(self, key, value):
+    """Use reg.exe to obtain the value of a registry key.
+
+    Args:
+      key: The registry key.
+      value: The particular registry value to read.
+    Return:
+      contents of the registry key's value, or None on failure.
+    """
+    text = self.Query(key, value)
+    if not text:
+      return None
+    # Extract value.
+    match = re.search(r'REG_\w+\s+([^\r]+)\r\n', text)
+    if not match:
+      return None
+    return match.group(1)
+
+  def KeyExists(self, key):
+    """Use reg.exe to see if a key exists.
+
+    Args:
+      key: The registry key to check.
+    Return:
+      True if the key exists
+    """
+    if not self.Query(key):
+      return False
+    return True