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 """ 7 This script runs every build as the first hook (See DEPS). If it detects that 8 the build should be clobbered, it will delete the contents of the build 9 directory. 10 11 A landmine is tripped when a builder checks out a different revision, and the 12 diff between the new landmines and the old ones is non-null. At this point, the 13 build is clobbered. 14 """ 15 16 import difflib 17 import errno 18 import gyp_environment 19 import logging 20 import optparse 21 import os 22 import shutil 23 import sys 24 import subprocess 25 import time 26 27 import landmine_utils 28 29 30 SRC_DIR = os.path.dirname(os.path.dirname(os.path.realpath(__file__))) 31 32 33 def 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 53 def 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 88 def 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 116 117 118 def 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 0 134 135 136 if __name__ == '__main__': 137 sys.exit(main()) 138