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# 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.
"""A wrapper for subprocess to make calling shell commands easier."""
import logging
import subprocess
def RunCmd(args, cwd=None):
"""Opens a subprocess to execute a program and returns its return value.
Args:
args: A string or a sequence of program arguments. The program to execute is
the string or the first item in the args sequence.
cwd: If not None, the subprocess's current directory will be changed to
|cwd| before it's executed.
Returns:
Return code from the command execution.
"""
logging.info(str(args) + ' ' + (cwd or ''))
p = subprocess.Popen(args=args, cwd=cwd)
return p.wait()
def GetCmdOutput(args, cwd=None, shell=False):
"""Open a subprocess to execute a program and returns its output.
Args:
args: A string or a sequence of program arguments. The program to execute is
the string or the first item in the args sequence.
cwd: If not None, the subprocess's current directory will be changed to
|cwd| before it's executed.
shell: Whether to execute args as a shell command.
Returns:
Captures and returns the command's stdout.
Prints the command's stderr to logger (which defaults to stdout).
"""
logging.info(str(args) + ' ' + (cwd or ''))
p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, shell=shell)
stdout, stderr = p.communicate()
if stderr:
logging.critical(stderr)
logging.info(stdout[:4096]) # Truncate output longer than 4k.
return stdout
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