1#!/usr/bin/env python 2# Copyright (c) 2012 The Chromium Authors. All rights reserved. 3# Use of this source code is governed by a BSD-style license that can be 4# found in the LICENSE file. 5 6""" 7This script runs every build as the first hook (See DEPS). If it detects that 8the build should be clobbered, it will delete the contents of the build 9directory. 10 11A landmine is tripped when a builder checks out a different revision, and the 12diff between the new landmines and the old ones is non-null. At this point, the 13build is clobbered. 14""" 15 16import difflib 17import errno 18import gyp_environment 19import logging 20import optparse 21import os 22import shutil 23import sys 24import subprocess 25import time 26 27import landmine_utils 28 29 30SRC_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__))) 31 32 33def get_build_dir(build_tool, is_iphone=False): 34 """ 35 Returns output directory absolute path dependent on build and targets. 36 Examples: 37 r'c:\b\build\slave\win\build\src\out' 38 '/mnt/data/b/build/slave/linux/build/src/out' 39 '/b/build/slave/ios_rel_device/build/src/xcodebuild' 40 41 Keep this function in sync with tools/build/scripts/slave/compile.py 42 """ 43 ret = None 44 if build_tool == 'xcode': 45 ret = os.path.join(SRC_DIR, 'xcodebuild') 46 elif build_tool in ['make', 'ninja', 'ninja-ios']: # TODO: Remove ninja-ios. 47 ret = os.path.join(SRC_DIR, os.environ.get('CHROMIUM_OUT_DIR', 'out')) 48 else: 49 raise NotImplementedError('Unexpected GYP_GENERATORS (%s)' % build_tool) 50 return os.path.abspath(ret) 51 52 53def clobber_if_necessary(new_landmines): 54 """Does the work of setting, planting, and triggering landmines.""" 55 out_dir = get_build_dir(landmine_utils.builder()) 56 landmines_path = os.path.normpath(os.path.join(out_dir, '..', '.landmines')) 57 try: 58 os.makedirs(out_dir) 59 except OSError as e: 60 if e.errno == errno.EEXIST: 61 pass 62 63 if os.path.exists(landmines_path): 64 with open(landmines_path, 'r') as f: 65 old_landmines = f.readlines() 66 if old_landmines != new_landmines: 67 old_date = time.ctime(os.stat(landmines_path).st_ctime) 68 diff = difflib.unified_diff(old_landmines, new_landmines, 69 fromfile='old_landmines', tofile='new_landmines', 70 fromfiledate=old_date, tofiledate=time.ctime(), n=0) 71 sys.stdout.write('Clobbering due to:\n') 72 sys.stdout.writelines(diff) 73 74 # Clobber contents of build directory but not directory itself: some 75 # checkouts have the build directory mounted. 76 for f in os.listdir(out_dir): 77 path = os.path.join(out_dir, f) 78 if os.path.isfile(path): 79 os.unlink(path) 80 elif os.path.isdir(path): 81 shutil.rmtree(path) 82 83 # Save current set of landmines for next time. 84 with open(landmines_path, 'w') as f: 85 f.writelines(new_landmines) 86 87 88def process_options(): 89 """Returns a list of landmine emitting scripts.""" 90 parser = optparse.OptionParser() 91 parser.add_option( 92 '-s', '--landmine-scripts', action='append', 93 default=[os.path.join(SRC_DIR, 'build', 'get_landmines.py')], 94 help='Path to the script which emits landmines to stdout. The target ' 95 'is passed to this script via option -t. Note that an extra ' 96 'script can be specified via an env var EXTRA_LANDMINES_SCRIPT.') 97 parser.add_option('-v', '--verbose', action='store_true', 98 default=('LANDMINES_VERBOSE' in os.environ), 99 help=('Emit some extra debugging information (default off). This option ' 100 'is also enabled by the presence of a LANDMINES_VERBOSE environment ' 101 'variable.')) 102 103 options, args = parser.parse_args() 104 105 if args: 106 parser.error('Unknown arguments %s' % args) 107 108 logging.basicConfig( 109 level=logging.DEBUG if options.verbose else logging.ERROR) 110 111 extra_script = os.environ.get('EXTRA_LANDMINES_SCRIPT') 112 if extra_script: 113 return options.landmine_scripts + [extra_script] 114 else: 115 return options.landmine_scripts 116 117 118def main(): 119 landmine_scripts = process_options() 120 121 if landmine_utils.builder() in ('dump_dependency_json', 'eclipse'): 122 return 0 123 124 gyp_environment.SetEnvironment() 125 126 landmines = [] 127 for s in landmine_scripts: 128 proc = subprocess.Popen([sys.executable, s], stdout=subprocess.PIPE) 129 output, _ = proc.communicate() 130 landmines.extend([('%s\n' % l.strip()) for l in output.splitlines()]) 131 clobber_if_necessary(landmines) 132 133 return 0 134 135 136if __name__ == '__main__': 137 sys.exit(main()) 138