Add a virtualenv-based python bootstrapping service to infra.

bootstrap/build_deps.py

Index: bootstrap/build_deps.py
diff --git a/bootstrap/build_deps.py b/bootstrap/build_deps.py
new file mode 100755
index 0000000000000000000000000000000000000000..18d248b3ce9443d4f070e90f67fbdff3792b44ef
--- /dev/null
+++ b/bootstrap/build_deps.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python
+# 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 argparse
+import hashlib
+import os
+import shutil
+import subprocess
+import sys
+
+import bootstrap
+
+from util import GIT_REPO, ROOT, WHEELHOUSE, WHEELS_URL, SOURCE_URL
+
+from util import tempdir, tempname, read_deps, print_deps, platform_tag
+
+
+def has_custom_build(name):
+  return os.path.exists(os.path.join(ROOT, 'custom_builds', name + '.py'))
+
+
+def pip(*args, **kwargs):
+  subprocess.check_call(
+      (os.path.join(sys.prefix, 'bin', 'pip'),) + args, **kwargs)
+
+
+def wheel(arg, source_sha, build, build_options):
+  with tempdir() as tdir:
+    args = ['wheel', '--no-index', '--no-deps', '--wheel-dir', tdir]
+    for op in build_options:
+      args += ['--global-option', op]
+    args += [arg]
+    pip(*args)
+    grab_wheel(tdir, WHEELHOUSE, source_sha, build)
+
+
+def grab_wheel(src, dst, source_sha, build):
+  # late import lets us grab the virtualenv pip
+  from pip.wheel import Wheel
+
+  items = os.listdir(src)
+  assert len(items) == 1, 'Wrong number of files in wheel directory: %r' % items
+
+  wheelfile = items[0]
+  wheel_info = Wheel.wheel_file_re.match(wheelfile)
+
+  assert wheel_info is not None, 'Not a wheel file? %r' % wheelfile
+
+  plat_tag = ''
+  if not wheelfile.endswith('none-any.whl'):
+    plat_tag = platform_tag()
+
+  os.rename(os.path.join(src, wheelfile),
+            os.path.join(dst, '{}-{}_{}{}{}'.format(
+              wheel_info.group('namever'),
+              build,
+              source_sha,
+              plat_tag,
+              wheel_info.group(4),
+            )))
+
+
+def run_custom_build(name, link, sha, build):
+  from pip.index import Link
+  from pip.download import unpack_file_url, unpack_vcs_link, is_vcs_url
+
+  assert has_custom_build(name)
+
+  link = Link(link, trusted=True)
+  unpack = unpack_vcs_link if is_vcs_url(link) else unpack_file_url
+
+  with tempdir() as tmpd, tempdir() as wheeld:  # pylint: disable=C0321
+    unpack(link, tmpd)
+    m = getattr(__import__('custom_builds.%s' % (name,)), name)
+    m.Build(tmpd, wheeld)
+    grab_wheel(wheeld, WHEELHOUSE, sha, build)
+
+
+def process_git(name, rev, build, build_options):
+  print
+  print 'Processing (git)', name, rev
+
+  url = GIT_REPO.format(name) + '@' + rev
+
+  if not has_custom_build(name):
+    wheel(url, rev, build, build_options)
+  else:
+    run_custom_build(name, url, rev, build)
+
+
+def process_gs(name, sha_ext, build, build_options):
+  print
+  print 'Processing (gs)', name, sha_ext
+
+  sha, ext = sha_ext.split('.', 1)
+  with tempname(ext) as tmp:
+    link = 'file://' + tmp
+    subprocess.check_call(['gsutil', 'cp', SOURCE_URL.format(sha_ext), tmp])
+    with open(tmp, 'rb') as f:
+      assert hashlib.sha1(f.read()).hexdigest() == sha
+    if not has_custom_build(name):
+      wheel(link, sha, build, build_options)
+    else:
+      run_custom_build(name, link, sha, build)
+
+
+def clear_wheelhouse():
+  shutil.rmtree(WHEELHOUSE, ignore_errors=True)
+  try:
+    os.makedirs(WHEELHOUSE)
+  except OSError:
+    pass
+
+
+def push_wheelhouse():
+  return subprocess.call(['gsutil', '-m', 'cp', WHEELHOUSE + '/*', WHEELS_URL])
+
+
+def main(args):
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      'to_build', nargs='*',
+      help='Names of packages to build. Defaults to all packages.')
+  opts = parser.parse_args(args)
+
+  if 'Ubuntu' in platform_tag() and ROOT.startswith('/usr/local/'):
+    print >> sys.stderr, "\n".join([
+      "Due to a bug in Ubuntu's python distribution, build_deps.py does not",
+      "work when run from under a path beginning with /usr/local/. Please ",
+      "clone to a different path, and try again.",
+      "",
+      "Bug: https://github.com/pypa/virtualenv/issues/118"
+    ])
+    return 1
+
+  to_build = set(opts.to_build)
+
+  build_env = os.path.join(ROOT, 'BUILD_ENV')
+
+  print 'Parsing deps.pyl'
+  deps = read_deps(os.path.join(ROOT, 'deps.pyl'))
+  bootstrap.activate_env(build_env, {'wheel': deps.pop('wheel')})
+
+  print 'Finding missing deps'
+  missing_deps = {}
+  for name, entry in deps.iteritems():
+    if to_build and name not in to_build:
+      continue
+    try:
+      bootstrap.get_links({name: entry})
+    except bootstrap.NoWheelException:
+      missing_deps[name] = entry
+
+  if not missing_deps:
+    print 'Nothing to process'
+    return
+
+  print 'Processing deps:'
+  print_deps(missing_deps)
+
+  for name, options in missing_deps.iteritems():
+    clear_wheelhouse()
+    # TODO(iannucci):  skip entries which already exist in gs
+    if 'rev' in options:
+      process_git(name, options['rev'], options['build'],
+                  options.get('build_options', ()))
+    elif 'gs' in options:
+      process_gs(name, options['gs'], options['build'],
+                 options.get('build_options', ()))
+    else:
+      raise Exception('Invalid options %r for %r' % (options, name))
+    push_wheelhouse()
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))