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Unified Diff: build/landmines.py

Issue 11377141: Selective build clobbering feature (landmines.py and android build scripts). (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: formatting fix Created 8 years, 1 month ago
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Index: build/landmines.py
diff --git a/build/landmines.py b/build/landmines.py
new file mode 100755
index 0000000000000000000000000000000000000000..36253e9badd5bcdc9d752f1e194eef3f53bc0ec5
--- /dev/null
+++ b/build/landmines.py
@@ -0,0 +1,210 @@
+#!/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.
+
+"""
+This file holds a list of reasons why a particular build needs to be clobbered
+(or a list of 'landmines').
+
+This script runs every build as a hook. If it detects that the build should
+be clobbered, it will touch the file <build_dir>/.landmine_triggered. The
+various build scripts will then check for the presence of this file and clobber
+accordingly. The script will also emit the reasons for the clobber to stdout.
+
+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 functools
+import gyp_helper
+import os
+import shlex
+import sys
+import time
+
+SRC_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+
+def memoize(default=None):
+ """This decorator caches the return value of a parameterless pure function"""
+ def memoizer(func):
+ val = []
+ @functools.wraps(func)
+ def inner():
+ if not val:
+ ret = func()
+ val.append(ret if ret is not None else default)
+ print '%s -> %r' % (func.__name__, val[0])
+ return val[0]
+ return inner
+ return memoizer
+
+
+@memoize()
+def IsWindows():
+ return sys.platform.startswith('win') or sys.platform == 'cygwin'
+
+
+@memoize()
+def IsLinux():
+ return sys.platform.startswith('linux')
+
+
+@memoize()
+def IsMac():
+ return sys.platform.startswith('darwin')
+
+
+@memoize()
+def gyp_defines():
+ """Parses and returns GYP_DEFINES env var as a dictionary."""
+ return dict(arg.split('=', 1)
+ for arg in shlex.split(os.environ.get('GYP_DEFINES', '')))
+
+
+@memoize()
+def distributor():
+ """
+ Returns a string which is the distributed build engine in use (if any).
+ Possible values: 'goma', 'ib', ''
+ """
+ if 'goma' in gyp_defines():
+ return 'goma'
+ elif IsWindows():
+ if 'CHROME_HEADLESS' in os.environ:
+ return 'ib' # use (win and !goma and headless) as approximation of ib
+
+
+@memoize()
+def platform():
+ """
+ Returns a string representing the platform this build is targetted for.
+ Possible values: 'win', 'mac', 'linux', 'ios', 'android'
+ """
+ if 'OS' in gyp_defines():
+ if 'android' in gyp_defines()['OS']:
+ return 'android'
+ else:
+ return gyp_defines()['OS']
+ elif IsWindows():
+ return 'win'
+ elif IsLinux():
+ return 'linux'
+ else:
+ return 'mac'
+
+
+@memoize()
+def builder():
+ """
+ Returns a string representing the build engine (not compiler) to use.
+ Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
+ """
+ if 'GYP_GENERATORS' in os.environ:
+ # for simplicity, only support the first explicit generator
+ generator = os.environ['GYP_GENERATORS'].split(',')[0]
+ if generator.endswith('-android'):
+ return generator.split('-')[0]
+ else:
+ return generator
+ else:
+ if platform() == 'android':
+ # Good enough for now? Do any android bots use make?
+ return 'ninja'
+ elif platform() == 'ios':
+ return 'xcode'
+ elif IsWindows():
+ return 'msvs'
+ elif IsLinux():
+ return 'make'
+ elif IsMac():
+ return 'xcode'
+ else:
+ assert False, 'Don\'t know what builder we\'re using!'
+
+
+def get_landmines(target):
+ """
+ ALL LANDMINES ARE DEFINED HERE.
+ target is 'Release' or 'Debug'
+ """
+ landmines = []
+ add = lambda item: landmines.append(item + '\n')
+
+ if (distributor() == 'goma' and platform() == 'win32' and
+ builder() == 'ninja'):
+ add('Need to clobber winja goma due to backend cwd cache fix.')
+
+ return landmines
+
+
+def get_target_build_dir(build_tool, target, is_iphone=False):
+ """
+ Returns output directory absolute path dependent on build and targets.
+ Examples:
+ r'c:\b\build\slave\win\build\src\out\Release'
+ '/mnt/data/b/build/slave/linux/build/src/out/Debug'
+ '/b/build/slave/ios_rel_device/build/src/xcodebuild/Release-iphoneos'
+
+ 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',
+ target + ('-iphoneos' if is_iphone else ''))
+ elif build_tool == 'make':
+ ret = os.path.join(SRC_DIR, 'out', target)
+ elif build_tool == 'ninja':
+ ret = os.path.join(SRC_DIR, 'out', target)
+ elif build_tool == 'msvs':
+ ret = os.path.join(SRC_DIR, 'build', target)
+ elif build_tool == 'scons':
+ ret = os.path.join(SRC_DIR, 'sconsbuild', target)
+ else:
+ raise NotImplementedError()
+ return os.path.abspath(ret)
+
+
+def main(argv):
+ if len(argv) > 1:
+ print('Unknown arguments %s' % argv[1:])
+ return 1
+
+ gyp_helper.apply_chromium_gyp_env()
+
+ for target in ('Debug', 'Release'):
+ out_dir = get_target_build_dir(builder(), target,
+ platform() == 'ios')
+
+ landmines_path = os.path.join(out_dir, '.landmines')
+ if not os.path.exists(out_dir):
+ os.makedirs(out_dir)
+
+ new_landmines = get_landmines(target)
+
+ if not os.path.exists(landmines_path):
+ with open(landmines_path, 'w') as f:
+ f.writelines(new_landmines)
+ else:
+ triggered = os.path.join(out_dir, '.landmines_triggered')
+ 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)
+
+ with open(triggered, 'w') as f:
+ f.writelines(diff)
+ elif os.path.exists(triggered):
+ # Remove false triggered landmines.
+ os.remove(triggered)
+
+ return 0
+
+
+if __name__ == '__main__':
+ sys.exit(main(sys.argv))
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