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util/helper: add stderr param to ProcessWrapper #1787

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util/helper: add stderr param to ProcessWrapper #1787

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7 changes: 5 additions & 2 deletions labgrid/util/helper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ class ProcessWrapper:
loglevel = logging.INFO

@step(args=['command'], result=True, tag='process')
def check_output(self, command, *, print_on_silent_log=False, input=None, stdin=None): # pylint: disable=redefined-builtin
def check_output(self, command, *, print_on_silent_log=False, input=None, stdin=None, stderr=None): # pylint: disable=redefined-builtin
"""Run a command and supply the output to callback functions"""
logger = logging.getLogger("Process")
res = []
Expand All @@ -58,7 +58,10 @@ def check_output(self, command, *, print_on_silent_log=False, input=None, stdin=
elif stdin is not None:
kwargs['stdin'] = stdin

process = subprocess.Popen(command, stderr=sfd,
if stderr is None:
stderr = sfd

process = subprocess.Popen(command, stderr=stderr,
stdout=sfd, bufsize=0, **kwargs)

logger.log(ProcessWrapper.loglevel, "[%d] command: %s", process.pid, " ".join(command))
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