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"""Sanity checks for command-line options."""
import re
import signal
from subprocess import PIPE
from subprocess import Popen
import pytest
@pytest.fixture
def current_version():
return open('VERSION').read().strip()
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_no_arguments_prints_usage():
proc = Popen(('dumb-init'), stderr=PIPE)
_, stderr = proc.communicate()
assert proc.returncode != 0
assert stderr == (
b'Usage: dumb-init [option] program [args]\n'
b'Try dumb-init --help for full usage.\n'
)
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_exits_invalid_with_invalid_args():
proc = Popen(('dumb-init', '--yolo', '/bin/true'), stderr=PIPE)
_, stderr = proc.communicate()
assert proc.returncode == 1
assert stderr in (
b"dumb-init: unrecognized option '--yolo'\n", # glibc
b'dumb-init: unrecognized option: yolo\n', # musl
)
@pytest.mark.parametrize('flag', ['-h', '--help'])
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_help_message(flag, current_version):
"""dumb-init should say something useful when called with the help flag,
and exit zero.
"""
proc = Popen(('dumb-init', flag), stderr=PIPE)
_, stderr = proc.communicate()
assert proc.returncode == 0
assert stderr == (
b'dumb-init v' + current_version.encode('ascii') + b'\n'
b'Usage: dumb-init [option] command [[arg] ...]\n'
b'\n'
b'dumb-init is a simple process supervisor that forwards signals to children.\n'
b'It is designed to run as PID1 in minimal container environments.\n'
b'\n'
b'Optional arguments:\n'
b' -c, --single-child Run in single-child mode.\n'
b' In this mode, signals are only proxied to the\n'
b' direct child and not any of its descendants.\n'
b' -r, --rewrite s:r Rewrite received signal s to new signal r before proxying.\n'
b' To ignore (not proxy) a signal, rewrite it to 0.\n'
b' This option can be specified multiple times.\n'
b' -v, --verbose Print debugging information to stderr.\n'
b' -h, --help Print this help message and exit.\n'
b' -V, --version Print the current version and exit.\n'
b'\n'
b'Full help is available online at https://github.com/Yelp/dumb-init\n'
)
@pytest.mark.parametrize('flag', ['-V', '--version'])
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_version_message(flag, current_version):
"""dumb-init should print its version when asked to."""
proc = Popen(('dumb-init', flag), stderr=PIPE)
_, stderr = proc.communicate()
assert proc.returncode == 0
assert stderr == b'dumb-init v' + current_version.encode('ascii') + b'\n'
@pytest.mark.parametrize('flag', ['-v', '--verbose'])
def test_verbose(flag):
"""dumb-init should print debug output when asked to."""
proc = Popen(('dumb-init', flag, 'echo', 'oh,', 'hi'), stdout=PIPE, stderr=PIPE)
stdout, stderr = proc.communicate()
assert proc.returncode == 0
assert stdout == b'oh, hi\n'
# child/parent race to print output after the fork(), can't guarantee exact order
assert re.search(b'(^|\n)\\[dumb-init\\] setsid complete\\.\n', stderr), stderr # child
assert re.search( # parent
(
'(^|\n)\\[dumb-init\\] Child spawned with PID [0-9]+\\.\n'
'.*' # child might print here
'\\[dumb-init\\] Received signal {signal.SIGCHLD}\\.\n'
'\\[dumb-init\\] A child with PID [0-9]+ exited with exit status 0.\n'
'\\[dumb-init\\] Forwarded signal 15 to children\\.\n'
'\\[dumb-init\\] Child exited with status 0\\. Goodbye\\.\n$'
).format(signal=signal).encode('utf8'),
stderr,
re.DOTALL,
), stderr
@pytest.mark.parametrize('flag1', ['-v', '--verbose'])
@pytest.mark.parametrize('flag2', ['-c', '--single-child'])
def test_verbose_and_single_child(flag1, flag2):
"""dumb-init should print debug output when asked to."""
proc = Popen(('dumb-init', flag1, flag2, 'echo', 'oh,', 'hi'), stdout=PIPE, stderr=PIPE)
stdout, stderr = proc.communicate()
assert proc.returncode == 0
assert stdout == b'oh, hi\n'
assert re.match(
(
'^\\[dumb-init\\] Child spawned with PID [0-9]+\\.\n'
'\\[dumb-init\\] Received signal {signal.SIGCHLD}\\.\n'
'\\[dumb-init\\] A child with PID [0-9]+ exited with exit status 0.\n'
'\\[dumb-init\\] Forwarded signal 15 to children\\.\n'
'\\[dumb-init\\] Child exited with status 0\\. Goodbye\\.\n$'
).format(signal=signal).encode('utf8'),
stderr,
)
@pytest.mark.parametrize(
'extra_args', [
('-r',),
('-r', ''),
('-r', 'herp'),
('-r', 'herp:derp'),
('-r', '15'),
('-r', '15::12'),
('-r', '15:derp'),
('-r', '15:12', '-r'),
('-r', '15:12', '-r', '0'),
('-r', '15:12', '-r', '1:32'),
],
)
@pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
def test_rewrite_errors(extra_args):
proc = Popen(
('dumb-init',) + extra_args + ('echo', 'oh,', 'hi'),
stdout=PIPE, stderr=PIPE,
)
stdout, stderr = proc.communicate()
assert proc.returncode == 1
assert stderr == (
b'Usage: -r option takes <signum>:<signum>, where <signum> '
b'is between 1 and 31.\n'
b'This option can be specified multiple times.\n'
b'Use --help for full usage.\n'
)
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