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50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""A wrapper for subprocess to make calling shell commands easier."""
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import logging
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import subprocess
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def RunCmd(args, cwd=None):
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"""Opens a subprocess to execute a program and returns its return value.
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Args:
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args: A string or a sequence of program arguments. The program to execute is
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the string or the first item in the args sequence.
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cwd: If not None, the subprocess's current directory will be changed to
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|cwd| before it's executed.
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Returns:
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Return code from the command execution.
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"""
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logging.info(str(args) + ' ' + (cwd or ''))
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p = subprocess.Popen(args=args, cwd=cwd)
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return p.wait()
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def GetCmdOutput(args, cwd=None, shell=False):
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"""Open a subprocess to execute a program and returns its output.
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Args:
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args: A string or a sequence of program arguments. The program to execute is
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the string or the first item in the args sequence.
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cwd: If not None, the subprocess's current directory will be changed to
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|cwd| before it's executed.
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shell: Whether to execute args as a shell command.
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Returns:
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Captures and returns the command's stdout.
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Prints the command's stderr to logger (which defaults to stdout).
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"""
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logging.info(str(args) + ' ' + (cwd or ''))
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p = subprocess.Popen(args=args, cwd=cwd, stdout=subprocess.PIPE,
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stderr=subprocess.PIPE, shell=shell)
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stdout, stderr = p.communicate()
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if stderr:
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logging.critical(stderr)
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logging.info(stdout[:4096]) # Truncate output longer than 4k.
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return stdout
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