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import subprocess
import mitogen.core
import mitogen.parent
from mitogen.core import b
import testlib
class CommandLineTest(testlib.RouterMixin, testlib.TestCase):
# Ensure this version of Python produces a command line that is sufficient
# to bootstrap this version of Python.
#
# TODO:
# * 2.7 starting 2.4
# * 2.7 starting 3.x
# * 3.x starting 2.7
def test_valid_syntax(self):
options = mitogen.parent.Options(max_message_size=123)
conn = mitogen.parent.Connection(options, self.router)
conn.context = mitogen.core.Context(None, 123)
args = conn.get_boot_command()
# The boot command should write an ECO marker to stdout, read the
# preamble from stdin, then execute it.
# This test attaches /dev/zero to stdin to create a specific failure
# 1. Fork child reads PREAMBLE_COMPRESSED_LEN bytes of junk (all `\0`)
# 2. Fork child crashes (trying to decompress the junk data)
# 3. Fork child's file descriptors (write pipes) are closed by the OS
# 4. Fork parent does `dup(<read pipe>, <stdin>)` and `exec(<python>)`
# 5. Python reads `b''` (i.e. EOF) from stdin (a closed pipe)
# 6. Python runs `''` (a valid script) and exits with success
fp = open("/dev/zero", "r")
try:
proc = subprocess.Popen(args,
stdin=fp,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
stdout, stderr = proc.communicate()
self.assertEqual(0, proc.returncode)
self.assertEqual(stdout,
mitogen.parent.BootstrapProtocol.EC0_MARKER+b('\n'))
self.assertIn(
b("Error -3 while decompressing data"), # Unknown compression method
stderr,
)
finally:
fp.close()
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