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3b3e3c0f6c
At present all the 'command' methods return bytes. Most of the time we actually want strings, so change this. We still need to keep the internal representation as bytes since otherwise unicode strings might break over a read() boundary (e.g. 4KB), causing errors. But we can convert the end result to strings. Add a 'binary' parameter to cover the few cases where bytes are needed. Signed-off-by: Simon Glass <sjg@chromium.org>
142 lines
4.8 KiB
Python
142 lines
4.8 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2011 The Chromium OS Authors.
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#
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import os
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import cros_subprocess
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import tools
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"""Shell command ease-ups for Python."""
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class CommandResult:
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"""A class which captures the result of executing a command.
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Members:
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stdout: stdout obtained from command, as a string
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stderr: stderr obtained from command, as a string
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return_code: Return code from command
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exception: Exception received, or None if all ok
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"""
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def __init__(self):
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self.stdout = None
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self.stderr = None
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self.combined = None
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self.return_code = None
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self.exception = None
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def __init__(self, stdout='', stderr='', combined='', return_code=0,
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exception=None):
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self.stdout = stdout
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self.stderr = stderr
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self.combined = combined
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self.return_code = return_code
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self.exception = exception
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def ToOutput(self, binary):
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if not binary:
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self.stdout = tools.ToString(self.stdout)
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self.stderr = tools.ToString(self.stderr)
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self.combined = tools.ToString(self.combined)
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return self
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# This permits interception of RunPipe for test purposes. If it is set to
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# a function, then that function is called with the pipe list being
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# executed. Otherwise, it is assumed to be a CommandResult object, and is
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# returned as the result for every RunPipe() call.
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# When this value is None, commands are executed as normal.
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test_result = None
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def RunPipe(pipe_list, infile=None, outfile=None,
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capture=False, capture_stderr=False, oneline=False,
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raise_on_error=True, cwd=None, binary=False, **kwargs):
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"""
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Perform a command pipeline, with optional input/output filenames.
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Args:
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pipe_list: List of command lines to execute. Each command line is
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piped into the next, and is itself a list of strings. For
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example [ ['ls', '.git'] ['wc'] ] will pipe the output of
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'ls .git' into 'wc'.
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infile: File to provide stdin to the pipeline
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outfile: File to store stdout
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capture: True to capture output
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capture_stderr: True to capture stderr
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oneline: True to strip newline chars from output
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kwargs: Additional keyword arguments to cros_subprocess.Popen()
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Returns:
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CommandResult object
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"""
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if test_result:
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if hasattr(test_result, '__call__'):
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result = test_result(pipe_list=pipe_list)
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if result:
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return result
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else:
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return test_result
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# No result: fall through to normal processing
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result = CommandResult(b'', b'', b'')
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last_pipe = None
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pipeline = list(pipe_list)
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user_pipestr = '|'.join([' '.join(pipe) for pipe in pipe_list])
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kwargs['stdout'] = None
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kwargs['stderr'] = None
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while pipeline:
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cmd = pipeline.pop(0)
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if last_pipe is not None:
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kwargs['stdin'] = last_pipe.stdout
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elif infile:
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kwargs['stdin'] = open(infile, 'rb')
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if pipeline or capture:
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kwargs['stdout'] = cros_subprocess.PIPE
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elif outfile:
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kwargs['stdout'] = open(outfile, 'wb')
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if capture_stderr:
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kwargs['stderr'] = cros_subprocess.PIPE
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try:
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last_pipe = cros_subprocess.Popen(cmd, cwd=cwd, **kwargs)
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except Exception as err:
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result.exception = err
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if raise_on_error:
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raise Exception("Error running '%s': %s" % (user_pipestr, str))
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result.return_code = 255
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return result.ToOutput(binary)
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if capture:
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result.stdout, result.stderr, result.combined = (
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last_pipe.CommunicateFilter(None))
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if result.stdout and oneline:
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result.output = result.stdout.rstrip(b'\r\n')
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result.return_code = last_pipe.wait()
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else:
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result.return_code = os.waitpid(last_pipe.pid, 0)[1]
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if raise_on_error and result.return_code:
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raise Exception("Error running '%s'" % user_pipestr)
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return result.ToOutput(binary)
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def Output(*cmd, **kwargs):
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kwargs['raise_on_error'] = kwargs.get('raise_on_error', True)
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return RunPipe([cmd], capture=True, **kwargs).stdout
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def OutputOneLine(*cmd, **kwargs):
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"""Run a command and output it as a single-line string
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The command us expected to produce a single line of output
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Returns:
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String containing output of command
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"""
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raise_on_error = kwargs.pop('raise_on_error', True)
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result = RunPipe([cmd], capture=True, oneline=True,
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raise_on_error=raise_on_error, **kwargs).stdout.strip()
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return result
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def Run(*cmd, **kwargs):
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return RunPipe([cmd], **kwargs).stdout
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def RunList(cmd):
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return RunPipe([cmd], capture=True).stdout
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def StopAll():
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cros_subprocess.stay_alive = False
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