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#!/usr/bin/env vpython
# Copyright 2019 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.
"""Wraps an executable and any provided arguments into an executable script."""
import argparse
import os
import sys
import textwrap
# The bash template passes the python script into vpython via stdin.
# The interpreter doesn't know about the script, so we have bash
# inject the script location.
BASH_TEMPLATE = textwrap.dedent(
"""\
#!/usr/bin/env vpython
_SCRIPT_LOCATION = __file__
{script}
""")
# The batch template reruns the batch script with vpython, with the -x
# flag instructing the interpreter to ignore the first line. The interpreter
# knows about the (batch) script in this case, so it can get the file location
# directly.
BATCH_TEMPLATE = textwrap.dedent(
"""\
@SETLOCAL ENABLEDELAYEDEXPANSION \
& vpython.bat -x "%~f0" %* \
& EXIT /B !ERRORLEVEL!
_SCRIPT_LOCATION = __file__
{script}
""")
SCRIPT_TEMPLATES = {
'bash': BASH_TEMPLATE,
'batch': BATCH_TEMPLATE,
}
PY_TEMPLATE = textwrap.dedent(
"""\
import os
import re
import subprocess
import sys
_WRAPPED_PATH_RE = re.compile(r'@WrappedPath\(([^)]+)\)')
_PATH_TO_OUTPUT_DIR = '{path_to_output_dir}'
_SCRIPT_DIR = os.path.dirname(os.path.realpath(_SCRIPT_LOCATION))
def ExpandWrappedPath(arg):
m = _WRAPPED_PATH_RE.match(arg)
if m:
relpath = os.path.join(
os.path.relpath(_SCRIPT_DIR), _PATH_TO_OUTPUT_DIR, m.group(1))
return os.path.normpath(relpath)
return arg
def ExpandWrappedPaths(args):
for i, arg in enumerate(args):
args[i] = ExpandWrappedPath(arg)
return args
def main(raw_args):
executable_path = ExpandWrappedPath('{executable_path}')
executable_args = ExpandWrappedPaths({executable_args})
cmd = [executable_path] + executable_args + raw_args
if executable_path.endswith('.py'):
cmd = [sys.executable] + cmd
return subprocess.call(cmd)
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
""")
def Wrap(args):
"""Writes a wrapped script according to the provided arguments.
Arguments:
args: an argparse.Namespace object containing command-line arguments
as parsed by a parser returned by CreateArgumentParser.
"""
path_to_output_dir = os.path.relpath(
args.output_directory,
os.path.dirname(args.wrapper_script))
with open(args.wrapper_script, 'w') as wrapper_script:
py_contents = PY_TEMPLATE.format(
path_to_output_dir=path_to_output_dir,
executable_path=str(args.executable),
executable_args=str(args.executable_args))
template = SCRIPT_TEMPLATES[args.script_language]
wrapper_script.write(template.format(
script=py_contents))
os.chmod(args.wrapper_script, 0o750)
return 0
def CreateArgumentParser():
"""Creates an argparse.ArgumentParser instance."""
parser = argparse.ArgumentParser()
parser.add_argument(
'--executable',
help='Executable to wrap.')
parser.add_argument(
'--wrapper-script',
help='Path to which the wrapper script will be written.')
parser.add_argument(
'--output-directory',
help='Path to the output directory.')
parser.add_argument(
'--script-language',
choices=SCRIPT_TEMPLATES.keys(),
help='Language in which the wrapper script will be written.')
parser.add_argument(
'executable_args', nargs='*',
help='Arguments to wrap into the executable.')
return parser
def main(raw_args):
parser = CreateArgumentParser()
args = parser.parse_args(raw_args)
return Wrap(args)
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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