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import os
import shutil
from subprocess import run, PIPE
import pytest
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_working_directories():
"""The child process must start in the working directory in which
dumb-init was invoked, but dumb-init itself should not keep a
reference to that."""
# We need absolute path to dumb-init since we pass cwd=/tmp to get
# predictable output - so we can't rely on dumb-init being found
# in the "." directory.
dumb_init = os.path.realpath(shutil.which('dumb-init'))
proc = run((dumb_init,
'sh', '-c', 'readlink /proc/$PPID/cwd && readlink /proc/$$/cwd'),
cwd="/tmp", stdout=PIPE, stderr=PIPE)
assert proc.returncode == 0
assert proc.stdout == b'/\n/tmp\n'
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