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# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2011 The Chromium OS Authors.
#
import os
from patman import cros_subprocess
"""Shell command ease-ups for Python."""
class CommandResult:
"""A class which captures the result of executing a command.
Members:
stdout: stdout obtained from command, as a string
stderr: stderr obtained from command, as a string
return_code: Return code from command
exception: Exception received, or None if all ok
"""
def __init__(self, stdout='', stderr='', combined='', return_code=0,
exception=None):
self.stdout = stdout
self.stderr = stderr
self.combined = combined
self.return_code = return_code
self.exception = exception
def to_output(self, binary):
if not binary:
self.stdout = self.stdout.decode('utf-8')
self.stderr = self.stderr.decode('utf-8')
self.combined = self.combined.decode('utf-8')
return self
# This permits interception of RunPipe for test purposes. If it is set to
# a function, then that function is called with the pipe list being
# executed. Otherwise, it is assumed to be a CommandResult object, and is
# returned as the result for every run_pipe() call.
# When this value is None, commands are executed as normal.
test_result = None
def run_pipe(pipe_list, infile=None, outfile=None,
capture=False, capture_stderr=False, oneline=False,
raise_on_error=True, cwd=None, binary=False,
output_func=None, **kwargs):
"""
Perform a command pipeline, with optional input/output filenames.
Args:
pipe_list: List of command lines to execute. Each command line is
piped into the next, and is itself a list of strings. For
example [ ['ls', '.git'] ['wc'] ] will pipe the output of
'ls .git' into 'wc'.
infile: File to provide stdin to the pipeline
outfile: File to store stdout
capture: True to capture output
capture_stderr: True to capture stderr
oneline: True to strip newline chars from output
output_func: Output function to call with each output fragment
(if it returns True the function terminates)
kwargs: Additional keyword arguments to cros_subprocess.Popen()
Returns:
CommandResult object
"""
if test_result:
if hasattr(test_result, '__call__'):
# pylint: disable=E1102
result = test_result(pipe_list=pipe_list)
if result:
return result
else:
return test_result
# No result: fall through to normal processing
result = CommandResult(b'', b'', b'')
last_pipe = None
pipeline = list(pipe_list)
user_pipestr = '|'.join([' '.join(pipe) for pipe in pipe_list])
kwargs['stdout'] = None
kwargs['stderr'] = None
while pipeline:
cmd = pipeline.pop(0)
if last_pipe is not None:
kwargs['stdin'] = last_pipe.stdout
elif infile:
kwargs['stdin'] = open(infile, 'rb')
if pipeline or capture:
kwargs['stdout'] = cros_subprocess.PIPE
elif outfile:
kwargs['stdout'] = open(outfile, 'wb')
if capture_stderr:
kwargs['stderr'] = cros_subprocess.PIPE
try:
last_pipe = cros_subprocess.Popen(cmd, cwd=cwd, **kwargs)
except Exception as err:
result.exception = err
if raise_on_error:
raise Exception("Error running '%s': %s" % (user_pipestr, str))
result.return_code = 255
return result.to_output(binary)
if capture:
result.stdout, result.stderr, result.combined = (
last_pipe.communicate_filter(output_func))
if result.stdout and oneline:
result.output = result.stdout.rstrip(b'\r\n')
result.return_code = last_pipe.wait()
else:
result.return_code = os.waitpid(last_pipe.pid, 0)[1]
if raise_on_error and result.return_code:
raise Exception("Error running '%s'" % user_pipestr)
return result.to_output(binary)
def output(*cmd, **kwargs):
kwargs['raise_on_error'] = kwargs.get('raise_on_error', True)
return run_pipe([cmd], capture=True, **kwargs).stdout
def output_one_line(*cmd, **kwargs):
"""Run a command and output it as a single-line string
The command us expected to produce a single line of output
Returns:
String containing output of command
"""
raise_on_error = kwargs.pop('raise_on_error', True)
result = run_pipe([cmd], capture=True, oneline=True,
raise_on_error=raise_on_error, **kwargs).stdout.strip()
return result
def run(*cmd, **kwargs):
return run_pipe([cmd], **kwargs).stdout
def run_list(cmd):
return run_pipe([cmd], capture=True).stdout
def stop_all():
cros_subprocess.stay_alive = False
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