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#!/bin/sh
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# The beginning of this script is both valid shell and valid python,
# such that the script starts with the shell and is reexecuted with
# the right python.
'''which' python2.7 > /dev/null && exec python2.7 "$0" "$@" || exec python "$0" "$@"
'''
from __future__ import print_function, unicode_literals
import os
import sys
def ancestors(path):
while path:
yield path
(path, child) = os.path.split(path)
if child == "":
break
def load_mach(dir_path, mach_path):
import imp
with open(mach_path, 'r') as fh:
imp.load_module('mach_bootstrap', fh, mach_path,
('.py', 'r', imp.PY_SOURCE))
import mach_bootstrap
return mach_bootstrap.bootstrap(dir_path)
def check_and_get_mach(dir_path):
bootstrap_paths = (
'build/mach_bootstrap.py',
# test package bootstrap
'tools/mach_bootstrap.py',
)
for bootstrap_path in bootstrap_paths:
mach_path = os.path.join(dir_path, bootstrap_path)
if os.path.isfile(mach_path):
return load_mach(dir_path, mach_path)
return None
def get_mach():
# Check whether the current directory is within a mach src or obj dir.
for dir_path in ancestors(os.getcwd()):
# If we find a "config.status" and "mozinfo.json" file, we are in the objdir.
config_status_path = os.path.join(dir_path, 'config.status')
mozinfo_path = os.path.join(dir_path, 'mozinfo.json')
if os.path.isfile(config_status_path) and os.path.isfile(mozinfo_path):
import json
info = json.load(open(mozinfo_path))
if 'mozconfig' in info and 'MOZCONFIG' not in os.environ:
# If the MOZCONFIG environment variable is not already set, set it
# to the value from mozinfo.json. This will tell the build system
# to look for a config file at the path in $MOZCONFIG rather than
# its default locations.
#
# Note: subprocess requires native strings in os.environ on Windows
os.environ[b'MOZCONFIG'] = str(info['mozconfig'])
if 'topsrcdir' in info:
# Continue searching for mach_bootstrap in the source directory.
dir_path = info['topsrcdir']
mach = check_and_get_mach(dir_path)
if mach:
return mach
# If we didn't find a source path by scanning for a mozinfo.json, check
# whether the directory containing this script is a source directory. We
# follow symlinks so mach can be run even if cwd is outside the srcdir.
return check_and_get_mach(os.path.dirname(os.path.realpath(__file__)))
def main(args):
mach = get_mach()
if not mach:
print('Could not run mach: No mach source directory found.')
sys.exit(1)
sys.exit(mach.run(args))
if __name__ == '__main__':
if sys.platform == 'win32':
# This is a complete hack to work around the fact that Windows
# multiprocessing needs to import the original module (ie: this
# file), but only works if it has a .py extension.
#
# We do this by a sort of two-level function interposing. The first
# level interposes forking.get_command_line() with our version defined
# in my_get_command_line(). Our version of get_command_line will
# replace the command string with the contents of the fork_interpose()
# function to be used in the subprocess.
#
# The subprocess then gets an interposed imp.find_module(), which we
# hack up to find 'mach' without the .py extension, since we already
# know where it is (it's us!). If we're not looking for 'mach', then
# the original find_module will suffice.
#
# See also: http://bugs.python.org/issue19946
# And: https://bugzilla.mozilla.org/show_bug.cgi?id=914563
import inspect
from multiprocessing import forking
global orig_command_line
def fork_interpose():
import imp
import os
import sys
orig_find_module = imp.find_module
def my_find_module(name, dirs):
if name == 'mach':
path = os.path.join(dirs[0], 'mach')
f = open(path)
return (f, path, ('', 'r', imp.PY_SOURCE))
return orig_find_module(name, dirs)
# Don't allow writing bytecode file for mach module.
orig_load_module = imp.load_module
def my_load_module(name, file, path, description):
# multiprocess.forking invokes imp.load_module manually and
# hard-codes the name __parents_main__ as the module name.
if name == '__parents_main__':
old_bytecode = sys.dont_write_bytecode
sys.dont_write_bytecode = True
try:
return orig_load_module(name, file, path, description)
finally:
sys.dont_write_bytecode = old_bytecode
return orig_load_module(name, file, path, description)
imp.find_module = my_find_module
imp.load_module = my_load_module
from multiprocessing.forking import main; main()
def my_get_command_line():
fork_code, lineno = inspect.getsourcelines(fork_interpose)
# Remove the first line (for 'def fork_interpose():') and the three
# levels of indentation (12 spaces).
fork_string = ''.join(x[12:] for x in fork_code[1:])
cmdline = orig_command_line()
cmdline[2] = fork_string
return cmdline
orig_command_line = forking.get_command_line
forking.get_command_line = my_get_command_line
main(sys.argv[1:])
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