[gn] Move build to gypfiles

build/landmines.py

Index: build/landmines.py
diff --git a/build/landmines.py b/build/landmines.py
deleted file mode 100755
index 97c63901c1a904702017453877bb9e619f66469f..0000000000000000000000000000000000000000
--- a/build/landmines.py
+++ /dev/null
@@ -1,245 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2014 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""
-This script runs every build as the first hook (See DEPS). If it detects that
-the build should be clobbered, it will delete the contents of the build
-directory.
-
-A landmine is tripped when a builder checks out a different revision, and the
-diff between the new landmines and the old ones is non-null. At this point, the
-build is clobbered.
-"""
-
-import difflib
-import errno
-import gyp_environment
-import logging
-import optparse
-import os
-import re
-import shutil
-import sys
-import subprocess
-import time
-
-import landmine_utils
-
-
-SRC_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
-
-
-def get_build_dir(build_tool, is_iphone=False):
-  """
-  Returns output directory absolute path dependent on build and targets.
-  Examples:
-    r'c:\b\build\slave\win\build\src\out'
-    '/mnt/data/b/build/slave/linux/build/src/out'
-    '/b/build/slave/ios_rel_device/build/src/xcodebuild'
-
-  Keep this function in sync with tools/build/scripts/slave/compile.py
-  """
-  ret = None
-  if build_tool == 'xcode':
-    ret = os.path.join(SRC_DIR, 'xcodebuild')
-  elif build_tool in ['make', 'ninja', 'ninja-ios']:  # TODO: Remove ninja-ios.
-    if 'CHROMIUM_OUT_DIR' in os.environ:
-      output_dir = os.environ.get('CHROMIUM_OUT_DIR').strip()
-      if not output_dir:
-        raise Error('CHROMIUM_OUT_DIR environment variable is set but blank!')
-    else:
-      output_dir = landmine_utils.gyp_generator_flags().get('output_dir', 'out')
-    ret = os.path.join(SRC_DIR, output_dir)
-  elif build_tool in ['msvs', 'vs', 'ib']:
-    ret = os.path.join(SRC_DIR, 'build')
-  else:
-    raise NotImplementedError('Unexpected GYP_GENERATORS (%s)' % build_tool)
-  return os.path.abspath(ret)
-
-
-def extract_gn_build_commands(build_ninja_file):
-  """Extracts from a build.ninja the commands to run GN.
-
-  The commands to run GN are the gn rule and build.ninja build step at the
-  top of the build.ninja file. We want to keep these when deleting GN builds
-  since we want to preserve the command-line flags to GN.
-
-  On error, returns the empty string."""
-  result = ""
-  with open(build_ninja_file, 'r') as f:
-    # Read until the second blank line. The first thing GN writes to the file
-    # is the "rule gn" and the second is the section for "build build.ninja",
-    # separated by blank lines.
-    num_blank_lines = 0
-    while num_blank_lines < 2:
-      line = f.readline()
-      if len(line) == 0:
-        return ''  # Unexpected EOF.
-      result += line
-      if line[0] == '\n':
-        num_blank_lines = num_blank_lines + 1
-  return result
-
-def delete_build_dir(build_dir):
-  # GN writes a build.ninja.d file. Note that not all GN builds have args.gn.
-  build_ninja_d_file = os.path.join(build_dir, 'build.ninja.d')
-  if not os.path.exists(build_ninja_d_file):
-    shutil.rmtree(build_dir)
-    return
-
-  # GN builds aren't automatically regenerated when you sync. To avoid
-  # messing with the GN workflow, erase everything but the args file, and
-  # write a dummy build.ninja file that will automatically rerun GN the next
-  # time Ninja is run.
-  build_ninja_file = os.path.join(build_dir, 'build.ninja')
-  build_commands = extract_gn_build_commands(build_ninja_file)
-
-  try:
-    gn_args_file = os.path.join(build_dir, 'args.gn')
-    with open(gn_args_file, 'r') as f:
-      args_contents = f.read()
-  except IOError:
-    args_contents = ''
-
-  shutil.rmtree(build_dir)
-
-  # Put back the args file (if any).
-  os.mkdir(build_dir)
-  if args_contents != '':
-    with open(gn_args_file, 'w') as f:
-      f.write(args_contents)
-
-  # Write the build.ninja file sufficiently to regenerate itself.
-  with open(os.path.join(build_dir, 'build.ninja'), 'w') as f:
-    if build_commands != '':
-      f.write(build_commands)
-    else:
-      # Couldn't parse the build.ninja file, write a default thing.
-      f.write('''rule gn
-command = gn -q gen //out/%s/
-description = Regenerating ninja files
-
-build build.ninja: gn
-generator = 1
-depfile = build.ninja.d
-''' % (os.path.split(build_dir)[1]))
-
-  # Write a .d file for the build which references a nonexistant file. This
-  # will make Ninja always mark the build as dirty.
-  with open(build_ninja_d_file, 'w') as f:
-    f.write('build.ninja: nonexistant_file.gn\n')
-
-
-def needs_clobber(landmines_path, new_landmines):
-  if os.path.exists(landmines_path):
-    with open(landmines_path, 'r') as f:
-      old_landmines = f.readlines()
-    if old_landmines != new_landmines:
-      old_date = time.ctime(os.stat(landmines_path).st_ctime)
-      diff = difflib.unified_diff(old_landmines, new_landmines,
-          fromfile='old_landmines', tofile='new_landmines',
-          fromfiledate=old_date, tofiledate=time.ctime(), n=0)
-      sys.stdout.write('Clobbering due to:\n')
-      sys.stdout.writelines(diff)
-      return True
-  else:
-    sys.stdout.write('Clobbering due to missing landmines file.\n')
-    return True
-  return False
-
-
-def clobber_if_necessary(new_landmines):
-  """Does the work of setting, planting, and triggering landmines."""
-  out_dir = get_build_dir(landmine_utils.builder())
-  landmines_path = os.path.normpath(os.path.join(out_dir, '..', '.landmines'))
-  try:
-    os.makedirs(out_dir)
-  except OSError as e:
-    if e.errno == errno.EEXIST:
-      pass
-
-  if needs_clobber(landmines_path, new_landmines):
-    # Clobber contents of build directory but not directory itself: some
-    # checkouts have the build directory mounted.
-    for f in os.listdir(out_dir):
-      path = os.path.join(out_dir, f)
-      if os.path.basename(out_dir) == 'build':
-        # Only delete build directories and files for MSVS builds as the folder
-        # shares some checked out files and directories.
-        if (os.path.isdir(path) and
-            re.search(r'(?:[Rr]elease)|(?:[Dd]ebug)', f)):
-          delete_build_dir(path)
-        elif (os.path.isfile(path) and
-              (path.endswith('.sln') or
-               path.endswith('.vcxproj') or
-               path.endswith('.vcxproj.user'))):
-          os.unlink(path)
-      else:
-        if os.path.isfile(path):
-          os.unlink(path)
-        elif os.path.isdir(path):
-          delete_build_dir(path)
-    if os.path.basename(out_dir) == 'xcodebuild':
-      # Xcodebuild puts an additional project file structure into build,
-      # while the output folder is xcodebuild.
-      project_dir = os.path.join(SRC_DIR, 'build', 'all.xcodeproj')
-      if os.path.exists(project_dir) and os.path.isdir(project_dir):
-        delete_build_dir(project_dir)
-
-  # Save current set of landmines for next time.
-  with open(landmines_path, 'w') as f:
-    f.writelines(new_landmines)
-
-
-def process_options():
-  """Returns a list of landmine emitting scripts."""
-  parser = optparse.OptionParser()
-  parser.add_option(
-      '-s', '--landmine-scripts', action='append',
-      default=[os.path.join(SRC_DIR, 'build', 'get_landmines.py')],
-      help='Path to the script which emits landmines to stdout. The target '
-           'is passed to this script via option -t. Note that an extra '
-           'script can be specified via an env var EXTRA_LANDMINES_SCRIPT.')
-  parser.add_option('-v', '--verbose', action='store_true',
-      default=('LANDMINES_VERBOSE' in os.environ),
-      help=('Emit some extra debugging information (default off). This option '
-          'is also enabled by the presence of a LANDMINES_VERBOSE environment '
-          'variable.'))
-
-  options, args = parser.parse_args()
-
-  if args:
-    parser.error('Unknown arguments %s' % args)
-
-  logging.basicConfig(
-      level=logging.DEBUG if options.verbose else logging.ERROR)
-
-  extra_script = os.environ.get('EXTRA_LANDMINES_SCRIPT')
-  if extra_script:
-    return options.landmine_scripts + [extra_script]
-  else:
-    return options.landmine_scripts
-
-
-def main():
-  landmine_scripts = process_options()
-
-  if landmine_utils.builder() in ('dump_dependency_json', 'eclipse'):
-    return 0
-
-  gyp_environment.set_environment()
-
-  landmines = []
-  for s in landmine_scripts:
-    proc = subprocess.Popen([sys.executable, s], stdout=subprocess.PIPE)
-    output, _ = proc.communicate()
-    landmines.extend([('%s\n' % l.strip()) for l in output.splitlines()])
-  clobber_if_necessary(landmines)
-
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main())