Re-land: Added virtualenv for depot_tools

bootstrap/util.py

Index: bootstrap/util.py
diff --git a/bootstrap/util.py b/bootstrap/util.py
new file mode 100644
index 0000000000000000000000000000000000000000..d64b142bfaa4d7b51aba08751d772b95b7fca918
--- /dev/null
+++ b/bootstrap/util.py
@@ -0,0 +1,87 @@
+# Copyright 2014 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.
+
+import ast
+import contextlib
+import os
+import platform
+import shutil
+import sys
+import tempfile
+
+
+ROOT = os.path.dirname(os.path.abspath(__file__))
+WHEELHOUSE = os.path.join(ROOT, 'wheelhouse')
+
+BUCKET = 'chrome-python-wheelhouse'
+STORAGE_URL = 'https://www.googleapis.com/storage/v1/b/{}/o'.format(BUCKET)
+OBJECT_URL = 'https://storage.googleapis.com/{}/{{}}#md5={{}}'.format(BUCKET)
+LOCAL_OBJECT_URL = 'file://{}'
+
+LOCAL_STORAGE_PATH = os.path.join(ROOT, 'wheelhouse_cache')
+
+SOURCE_URL = 'gs://{}/sources/{{}}'.format(BUCKET)
+WHEELS_URL = 'gs://{}/wheels/'.format(BUCKET)
+
+
+class DepsConflictException(Exception):
+  def __init__(self, name):
+    super(DepsConflictException, self).__init__(
+        'Package \'%s\' is defined twice in deps.pyl' % name)
+
+
+def platform_tag():
+  if sys.platform.startswith('linux'):
+    return '_{0}_{1}'.format(*platform.linux_distribution())
+  return ''
+
+
+def print_deps(deps, indent=1, with_implicit=True):
+  for dep, entry in deps.iteritems():
+    if not with_implicit and entry.get('implicit'):
+      continue
+    print '  ' * indent + '%s: %r' % (dep, entry)
+  print
+
+
+@contextlib.contextmanager
+def tempdir(*args, **kwargs):
+  tdir = None
+  try:
+    tdir = tempfile.mkdtemp(*args, **kwargs)
+    yield tdir
+  finally:
+    if tdir:
+      shutil.rmtree(tdir, ignore_errors=True)
+
+
+@contextlib.contextmanager
+def tempname(*args, **kwargs):
+  tmp = None
+  try:
+    tmp = tempfile.mktemp(*args, **kwargs)
+    yield tmp
+  finally:
+    if tmp:
+      try:
+        os.unlink(tmp)
+      except OSError:
+        pass
+
+
+def read_deps(path):
+  if os.path.exists(path):
+    with open(path, 'rb') as f:
+      return ast.literal_eval(f.read())
+
+
+def merge_deps(paths):
+  deps = {}
+  for path in paths:
+    d = read_deps(path)
+    for key in d:
+      if key in deps:
+        raise DepsConflictException(key)
+    deps.update(d)
+  return deps