def test_shell_background_support_setsid():
"""In setsid mode, dumb-init should suspend itself and its children when it
receives SIGTSTP, SIGTTOU, or SIGTTIN.
"""
with print_signals() as (proc, pid):
for signum in SUSPEND_SIGNALS:
# both dumb-init and print_signals should be running or sleeping
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
# both should now suspend
proc.send_signal(signum)
def assert_both_stopped():
assert process_state(proc.pid) == process_state(pid) == 'stopped'
sleep_until(assert_both_stopped)
# and then both wake up again
proc.send_signal(SIGCONT)
assert (
proc.stdout.readline() == '{0}\n'.format(SIGCONT).encode('ascii')
)
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
def test_shell_background_support_setsid():
"""In setsid mode, dumb-init should suspend itself and its children when it
receives SIGTSTP, SIGTTOU, or SIGTTIN.
"""
with print_signals() as (proc, pid):
for signum in SUSPEND_SIGNALS:
# both dumb-init and print_signals should be running or sleeping
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
# both should now suspend
proc.send_signal(signum)
def assert_both_stopped():
assert process_state(
proc.pid) == process_state(pid) == 'stopped'
sleep_until(assert_both_stopped)
# and then both wake up again
proc.send_signal(SIGCONT)
assert (proc.stdout.readline() == '{}\n'.format(SIGCONT).encode(
'ascii'))
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
def test_shell_background_support_without_setsid():
"""In non-setsid mode, dumb-init should forward the signals SIGTSTP,
SIGTTOU, and SIGTTIN, and then suspend itself.
"""
with print_signals() as (proc, _):
for signum in SUSPEND_SIGNALS:
assert process_state(proc.pid) in ['running', 'sleeping']
proc.send_signal(signum)
assert proc.stdout.readline() == '{}\n'.format(signum).encode(
'ascii')
os.waitpid(proc.pid, os.WUNTRACED)
assert process_state(proc.pid) == 'stopped'
proc.send_signal(SIGCONT)
assert (proc.stdout.readline() == '{}\n'.format(SIGCONT).encode(
'ascii'))
assert process_state(proc.pid) in ['running', 'sleeping']
def test_default_rewrites_can_be_overriden_with_setsid_enabled():
"""In setsid mode, dumb-init should allow overwriting the default
rewrites (but still suspend itself).
"""
rewrite_map = {signal.SIGTTIN: signal.SIGTERM, signal.SIGTTOU: signal.SIGINT, signal.SIGTSTP: signal.SIGHUP}
with print_signals(_rewrite_map_to_args(rewrite_map)) as (proc, _):
for send, expect_receive in rewrite_map.items():
assert process_state(proc.pid) in ["running", "sleeping"]
proc.send_signal(send)
assert proc.stdout.readline() == "{0}\n".format(expect_receive).encode("ascii")
os.waitpid(proc.pid, os.WUNTRACED)
assert process_state(proc.pid) == "stopped"
proc.send_signal(signal.SIGCONT)
assert proc.stdout.readline() == "{0}\n".format(signal.SIGCONT).encode("ascii")
assert process_state(proc.pid) in ["running", "sleeping"]
def test_shell_background_support_without_setsid():
"""In non-setsid mode, dumb-init should forward the signals SIGTSTP,
SIGTTOU, and SIGTTIN, and then suspend itself.
"""
with print_signals() as (proc, _):
for signum in SUSPEND_SIGNALS:
assert process_state(proc.pid) in ['running', 'sleeping']
proc.send_signal(signum)
assert proc.stdout.readline() == '{0}\n'.format(signum).encode('ascii')
os.waitpid(proc.pid, os.WUNTRACED)
assert process_state(proc.pid) == 'stopped'
proc.send_signal(SIGCONT)
assert (
proc.stdout.readline() == '{0}\n'.format(SIGCONT).encode('ascii')
)
assert process_state(proc.pid) in ['running', 'sleeping']
def test_default_rewrites_can_be_overriden_with_setsid_enabled():
"""In setsid mode, dumb-init should allow overwriting the default
rewrites (but still suspend itself).
"""
rewrite_map = {
signal.SIGTTIN: signal.SIGTERM,
signal.SIGTTOU: signal.SIGINT,
signal.SIGTSTP: signal.SIGHUP,
}
with print_signals(_rewrite_map_to_args(rewrite_map)) as (proc, _):
for send, expect_receive in rewrite_map.items():
assert process_state(proc.pid) in ['running', 'sleeping']
proc.send_signal(send)
assert proc.stdout.readline() == '{0}\n'.format(expect_receive).encode('ascii')
os.waitpid(proc.pid, os.WUNTRACED)
assert process_state(proc.pid) == 'stopped'
proc.send_signal(signal.SIGCONT)
assert proc.stdout.readline() == '{0}\n'.format(signal.SIGCONT).encode('ascii')
assert process_state(proc.pid) in ['running', 'sleeping']
def test_shell_background_support_setsid():
"""In setsid mode, dumb-init should suspend itself and its children when it
receives SIGTSTP, SIGTTOU, or SIGTTIN.
"""
with print_signals() as (proc, pid):
for signum in SUSPEND_SIGNALS:
# both dumb-init and print_signals should be running or sleeping
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
# both should now suspend
proc.send_signal(signum)
for _ in range(1000):
time.sleep(0.001)
try:
assert process_state(proc.pid) == 'stopped'
assert process_state(pid) == 'stopped'
except AssertionError:
pass
else:
break
else:
raise RuntimeError('Timed out waiting for processes to stop.')
# and then both wake up again
proc.send_signal(SIGCONT)
assert (
proc.stdout.readline() == '{0}\n'.format(SIGCONT).encode('ascii')
)
assert process_state(pid) in ['running', 'sleeping']
assert process_state(proc.pid) in ['running', 'sleeping']
def assert_both_stopped():
assert process_state(
proc.pid) == process_state(pid) == 'stopped'
def assert_both_stopped():
assert process_state(proc.pid) == process_state(pid) == 'stopped'