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Issue 2101243005: Add a snapshot of flutter/engine/src/build to our sdk (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: add README.dart Created 4 years, 5 months ago
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1 #!/usr/bin/env python
2 # Copyright 2015 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 """This script provides methods for clobbering build directories."""
7
8 import argparse
9 import os
10 import shutil
11 import sys
12
13
14 def extract_gn_build_commands(build_ninja_file):
15 """Extracts from a build.ninja the commands to run GN.
16
17 The commands to run GN are the gn rule and build.ninja build step at the
18 top of the build.ninja file. We want to keep these when deleting GN builds
19 since we want to preserve the command-line flags to GN.
20
21 On error, returns the empty string."""
22 result = ""
23 with open(build_ninja_file, 'r') as f:
24 # Read until the second blank line. The first thing GN writes to the file
25 # is the "rule gn" and the second is the section for "build build.ninja",
26 # separated by blank lines.
27 num_blank_lines = 0
28 while num_blank_lines < 2:
29 line = f.readline()
30 if len(line) == 0:
31 return '' # Unexpected EOF.
32 result += line
33 if line[0] == '\n':
34 num_blank_lines = num_blank_lines + 1
35 return result
36
37
38 def delete_build_dir(build_dir):
39 # GN writes a build.ninja.d file. Note that not all GN builds have args.gn.
40 build_ninja_d_file = os.path.join(build_dir, 'build.ninja.d')
41 if not os.path.exists(build_ninja_d_file):
42 shutil.rmtree(build_dir)
43 return
44
45 # GN builds aren't automatically regenerated when you sync. To avoid
46 # messing with the GN workflow, erase everything but the args file, and
47 # write a dummy build.ninja file that will automatically rerun GN the next
48 # time Ninja is run.
49 build_ninja_file = os.path.join(build_dir, 'build.ninja')
50 build_commands = extract_gn_build_commands(build_ninja_file)
51
52 try:
53 gn_args_file = os.path.join(build_dir, 'args.gn')
54 with open(gn_args_file, 'r') as f:
55 args_contents = f.read()
56 except IOError:
57 args_contents = ''
58
59 shutil.rmtree(build_dir)
60
61 # Put back the args file (if any).
62 os.mkdir(build_dir)
63 if args_contents != '':
64 with open(gn_args_file, 'w') as f:
65 f.write(args_contents)
66
67 # Write the build.ninja file sufficiently to regenerate itself.
68 with open(os.path.join(build_dir, 'build.ninja'), 'w') as f:
69 if build_commands != '':
70 f.write(build_commands)
71 else:
72 # Couldn't parse the build.ninja file, write a default thing.
73 f.write('''rule gn
74 command = gn -q gen //out/%s/
75 description = Regenerating ninja files
76
77 build build.ninja: gn
78 generator = 1
79 depfile = build.ninja.d
80 ''' % (os.path.split(build_dir)[1]))
81
82 # Write a .d file for the build which references a nonexistant file. This
83 # will make Ninja always mark the build as dirty.
84 with open(build_ninja_d_file, 'w') as f:
85 f.write('build.ninja: nonexistant_file.gn\n')
86
87
88 def clobber(out_dir):
89 """Clobber contents of build directory.
90
91 Don't delete the directory itself: some checkouts have the build directory
92 mounted."""
93 for f in os.listdir(out_dir):
94 path = os.path.join(out_dir, f)
95 if os.path.isfile(path):
96 os.unlink(path)
97 elif os.path.isdir(path):
98 delete_build_dir(path)
99
100
101 def main():
102 parser = argparse.ArgumentParser()
103 parser.add_argument('out_dir', help='The output directory to clobber')
104 args = parser.parse_args()
105 clobber(args.out_dir)
106 return 0
107
108
109 if __name__ == '__main__':
110 sys.exit(main())
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