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https://github.com/AsahiLinux/u-boot
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4583c00236
The patman directory has a number of modules which are used by other tools in U-Boot. This makes it hard to package the tools using pypi since the common files must be copied along with the tool that uses them. To address this, move these files into a new u_boot_pylib library. This can be packaged separately and listed as a dependency of each tool. Signed-off-by: Simon Glass <sjg@chromium.org>
139 lines
4.9 KiB
Python
139 lines
4.9 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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from u_boot_pylib import cros_subprocess
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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, 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 to_output(self, binary):
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if not binary:
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self.stdout = self.stdout.decode('utf-8')
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self.stderr = self.stderr.decode('utf-8')
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self.combined = self.combined.decode('utf-8')
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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 run_pipe() 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 run_pipe(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,
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output_func=None, **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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output_func: Output function to call with each output fragment
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(if it returns True the function terminates)
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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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# pylint: disable=E1102
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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.to_output(binary)
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if capture:
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result.stdout, result.stderr, result.combined = (
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last_pipe.communicate_filter(output_func))
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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.to_output(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 run_pipe([cmd], capture=True, **kwargs).stdout
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def output_one_line(*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 = run_pipe([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 run_pipe([cmd], **kwargs).stdout
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def run_list(cmd):
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return run_pipe([cmd], capture=True).stdout
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def stop_all():
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cros_subprocess.stay_alive = False
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