gn_run_binary.py

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#!/usr/bin/env python3
# Copyright 2014 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.
"""Helper script for GN to run an arbitrary binary. See compiled_action.gni.
 
Run with:
  python3 gn_run_binary.py <invoker> <binary_name> [args ...]
 
Where <invoker> is either "compiled_action" or "exec_script". If it is
"compiled_action" the script has a non-zero exit code on a failure. If it is
"exec_script" the script has no output on success and produces output otherwise,
but always has an exit code of 0.
"""
 
import os
import sys
import subprocess
 
 
# Run a command, swallowing the output unless there is an error.
def run_command(command):
    try:
        subprocess.check_output(command, stderr=subprocess.STDOUT)
        return 0
    except subprocess.CalledProcessError as e:
        return ("Command failed: " + ' '.join(command) + "\n" + "output: " +
                _decode(e.output))
    except OSError as e:
        return ("Command failed: " + ' '.join(command) + "\n" + "output: " +
                _decode(e.strerror))
 
 
def _decode(bytes):
    return bytes.decode("utf-8")
 
 
def main(argv):
    error_exit = 0
    if argv[1] == "compiled_action":
        error_exit = 1
    elif argv[1] != "exec_script":
        print("The first argument should be either "
              "'compiled_action' or 'exec_script")
        return 1
 
    # Unless the path is absolute, this script is designed to run binaries
    # produced by the current build, which is the current working directory when
    # this script is run.
    path = os.path.abspath(argv[2])
 
    if not os.path.isfile(path):
        print("Binary not found: " + path)
        return error_exit
 
    # The rest of the arguments are passed directly to the executable.
    args = [path] + argv[3:]
 
    result = run_command(args)
    if result != 0:
        print(result)
        return error_exit
    return 0
 
 
if __name__ == '__main__':
    sys.exit(main(sys.argv))