Add target base_unittests_run and tools/isolate/isolate.py.

tools/isolate/isolate.py

Index: tools/isolate/isolate.py
diff --git a/tools/isolate/isolate.py b/tools/isolate/isolate.py
new file mode 100755
index 0000000000000000000000000000000000000000..be4f076efa3a3b3ea32eeb11708f4d30faeb366e
--- /dev/null
+++ b/tools/isolate/isolate.py
@@ -0,0 +1,167 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+"""Does one of the following depending on the --mode argument:
+  check   verify all the inputs exist, touches the file specified with
+          --result and exits.
+  run     recreates a tree with all the inputs files and run the executable
+          in it.
+  remap   stores all the inputs files in a directory without running the
+          executable.
+"""
+
+import logging
+import optparse
+import os
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+import time
+
+import tree_creator
+
+
+def touch(filename):
+  """Implements the equivalent of the 'touch' command."""
+  if not os.path.exists(filename):
+    open(filename, 'a').close()
+  os.utime(filename, None)
+
+
+def rmtree(root):
+  """Wrapper around shutil.rmtree() to retry automatically on Windows."""
+  if sys.platform == 'win32':
+    for i in range(3):
+      try:
+        shutil.rmtree(root)
+        break
+      except WindowsError:  # pylint: disable=E0602
+        delay = (i+1)*2
+        print >> sys.stderr, (
+            'The test has subprocess outliving it. Sleep %d seconds.' % delay)
+        time.sleep(delay)
+  else:
+    shutil.rmtree(root)
+
+
+def isolate(outdir, root, resultfile, mode, read_only, args):
+  """Main function to isolate a target with its dependencies."""
+  cmd = []
+  if '--' in args:
+    # Strip off the command line from the inputs.
+    i = args.index('--')
+    cmd = args[i+1:]
+    args = args[:i]
+
+  # gyp provides paths relative to cwd. Convert them to be relative to
+  # root.
+  cwd = os.getcwd()
+
+  def make_relpath(i):
+    """Makes an input file a relative path but keeps any trailing slash."""
+    out = os.path.relpath(os.path.join(cwd, i), root)
+    if i.endswith('/'):
+      out += '/'
+    return out
+
+  infiles = [make_relpath(i) for i in args]
+
+  if not infiles:
+    raise ValueError('Need at least one input file to map')
+
+  # Other modes ignore the command.
+  if mode == 'run' and not cmd:
+    print >> sys.stderr, 'Using first input %s as executable' % infiles[0]
+    cmd = [infiles[0]]
+
+  tempdir = None
+  try:
+    if not outdir and mode != 'check':
+      tempdir = tempfile.mkdtemp(prefix='isolate')
+      outdir = tempdir
+    elif outdir:
+      outdir = os.path.abspath(outdir)
+
+    tree_creator.recreate_tree(
+        outdir,
+        os.path.abspath(root),
+        infiles,
+        tree_creator.DRY_RUN if mode == 'check' else tree_creator.HARDLINK,
+        lambda x: re.match(r'.*\.(svn|pyc)$', x))
+
+    if mode != 'check' and read_only:
+      tree_creator.make_writable(outdir, True)
+
+    if mode in ('check', 'remap'):
+      result = 0
+    else:
+      # TODO(maruel): Remove me. Layering violation. Used by
+      # base/base_paths_linux.cc
+      env = os.environ.copy()
+      env['CR_SOURCE_ROOT'] = outdir.encode()
+      # Rebase the command to the right path.
+      cmd[0] = os.path.join(outdir, cmd[0])
+      logging.info('Running %s' % cmd)
+      result = subprocess.call(cmd, cwd=outdir, env=env)
+
+    if not result and resultfile:
+      # Signal the build tool that the test succeeded.
+      touch(resultfile)
+    return result
+  finally:
+    if tempdir and mode == 'isolate':
+      if read_only:
+        tree_creator.make_writable(tempdir, False)
+      rmtree(tempdir)
+
+
+def main():
+  parser = optparse.OptionParser(
+      usage='%prog [options] [inputs] -- [command line]',
+      description=sys.modules[__name__].__doc__)
+  parser.allow_interspersed_args = False
+  parser.format_description = lambda *_: parser.description
+  parser.add_option(
+      '-v', '--verbose', action='count', default=0, help='Use multiple times')
+  parser.add_option(
+      '--mode', choices=['remap', 'check', 'run'],
+      help='Determines the action to be taken')
+  parser.add_option(
+      '--result', metavar='X',
+      help='File to be touched when the command succeeds')
+  parser.add_option('--root', help='Base directory to fetch files, required')
+  parser.add_option(
+      '--outdir', metavar='X',
+      help='Directory used to recreate the tree. Defaults to a /tmp '
+           'subdirectory')
+  parser.add_option(
+      '--read-only', action='store_true',
+      help='Make the temporary tree read-only')
+
+  options, args = parser.parse_args()
+  level = [logging.ERROR, logging.INFO, logging.DEBUG][min(2, options.verbose)]
+  logging.basicConfig(
+      level=level,
+      format='%(levelname)5s %(module)15s(%(lineno)3d): %(message)s')
+
+  if not options.root:
+    parser.error('--root is required.')
+
+  try:
+    return isolate(
+        options.outdir,
+        options.root,
+        options.result,
+        options.mode,
+        options.read_only,
+        args)
+  except ValueError, e:
+    parser.error(str(e))
+
+
+if __name__ == '__main__':
+  sys.exit(main())