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Create a CommandArgs object.
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Format command arguments for display.
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Return the arguments in their raw, unredacted form.
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Create and return the error message to use to log a subprocess error
with command output.
:param lines: A list of lines, each ending with a newline.
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Args:
show_stdout: if true, use INFO to log the subprocess's stderr and
stdout streams. Otherwise, use DEBUG. Defaults to False.
extra_ok_returncodes: an iterable of integer return codes that are
acceptable, in addition to 0. Defaults to None, which means [].
unset_environ: an iterable of environment variable names to unset
prior to calling subprocess.Popen().
log_failed_cmd: if false, failed commands are not logged, only raised.
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