1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
#!/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 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 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' not in os.environ and
'output_dir' in landmine_utils.gyp_generator_flags()):
output_dir = landmine_utils.gyp_generator_flags()['output_dir']
else:
output_dir = os.environ.get('CHROMIUM_OUT_DIR', 'out')
ret = os.path.join(SRC_DIR, output_dir)
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 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 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)
# 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.isfile(path):
os.unlink(path)
elif os.path.isdir(path):
delete_build_dir(path)
# 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.SetEnvironment()
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())
|
