147 строки
4.9 KiB
Python
Executable File
147 строки
4.9 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""
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This script runs every build as the first hook (See DEPS). If it detects that
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the build should be clobbered, it will delete the contents of the build
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directory.
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A landmine is tripped when a builder checks out a different revision, and the
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diff between the new landmines and the old ones is non-null. At this point, the
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build is clobbered.
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Before adding or changing a landmine consider the consequences of doing so.
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Doing so will wipe out every output directory on every Chrome developer's
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machine. This can be particularly problematic on Windows where the directory
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deletion may well fail (locked files, command prompt in the directory, etc.),
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and generated .sln and .vcxproj files will be deleted.
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This output directory deletion will be repated when going back and forth across
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the change that added the landmine, adding to the cost. There are usually less
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troublesome alternatives.
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"""
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import difflib
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import errno
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import logging
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import optparse
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import os
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import sys
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import subprocess
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import time
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import clobber
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import landmine_utils
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def get_build_dir(src_dir):
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r"""
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Returns output directory absolute path dependent on build and targets.
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Examples:
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r'c:\b\build\slave\win\build\src\out'
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'/mnt/data/b/build/slave/linux/build/src/out'
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'/b/build/slave/ios_rel_device/build/src/out'
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Keep this function in sync with tools/build/scripts/slave/compile.py
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"""
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if 'CHROMIUM_OUT_DIR' in os.environ:
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output_dir = os.environ.get('CHROMIUM_OUT_DIR').strip()
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if not output_dir:
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raise Error('CHROMIUM_OUT_DIR environment variable is set but blank!')
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else:
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output_dir = 'out'
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return os.path.abspath(os.path.join(src_dir, output_dir))
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def clobber_if_necessary(new_landmines, src_dir):
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"""Does the work of setting, planting, and triggering landmines."""
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out_dir = get_build_dir(src_dir)
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landmines_path = os.path.normpath(os.path.join(src_dir, '.landmines'))
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try:
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os.makedirs(out_dir)
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except OSError as e:
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if e.errno == errno.EEXIST:
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pass
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if os.path.exists(landmines_path):
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with open(landmines_path, 'r') as f:
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old_landmines = f.readlines()
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if old_landmines != new_landmines:
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old_date = time.ctime(os.stat(landmines_path).st_ctime)
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diff = difflib.unified_diff(old_landmines, new_landmines,
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fromfile='old_landmines', tofile='new_landmines',
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fromfiledate=old_date, tofiledate=time.ctime(), n=0)
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sys.stdout.write('Clobbering due to:\n')
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sys.stdout.writelines(diff)
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sys.stdout.flush()
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clobber.clobber(out_dir)
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# Save current set of landmines for next time.
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with open(landmines_path, 'w') as f:
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f.writelines(new_landmines)
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def process_options():
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"""Returns an options object containing the configuration for this script."""
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parser = optparse.OptionParser()
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parser.add_option(
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'-s', '--landmine-scripts', action='append',
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help='Path to the script which emits landmines to stdout. The target '
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'is passed to this script via option -t. Note that an extra '
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'script can be specified via an env var EXTRA_LANDMINES_SCRIPT.')
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parser.add_option('-d', '--src-dir',
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help='Path of the source root dir. Overrides the default location of the '
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'source root dir when calculating the build directory.')
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parser.add_option('-v', '--verbose', action='store_true',
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default=('LANDMINES_VERBOSE' in os.environ),
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help=('Emit some extra debugging information (default off). This option '
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'is also enabled by the presence of a LANDMINES_VERBOSE environment '
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'variable.'))
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options, args = parser.parse_args()
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if args:
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parser.error('Unknown arguments %s' % args)
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logging.basicConfig(
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level=logging.DEBUG if options.verbose else logging.ERROR)
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if options.src_dir:
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if not os.path.isdir(options.src_dir):
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parser.error('Cannot find source root dir at %s' % options.src_dir)
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logging.debug('Overriding source root dir. Using: %s', options.src_dir)
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else:
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options.src_dir = \
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os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
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if not options.landmine_scripts:
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options.landmine_scripts = [os.path.join(options.src_dir, 'build',
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'get_landmines.py')]
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extra_script = os.environ.get('EXTRA_LANDMINES_SCRIPT')
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if extra_script:
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options.landmine_scripts += [extra_script]
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return options
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def main():
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options = process_options()
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landmines = []
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for s in options.landmine_scripts:
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proc = subprocess.Popen([sys.executable, s], stdout=subprocess.PIPE,
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universal_newlines=True)
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output, _ = proc.communicate()
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landmines.extend([('%s\n' % l.strip()) for l in output.splitlines()])
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clobber_if_necessary(landmines, options.src_dir)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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