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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import contextlib
import io
import os
import sys
import types
import drgn
from drgn.commands.crash import CRASH_COMMAND_NAMESPACE
from tests.linux_kernel import LinuxKernelTestCase
class CrashCommandTestCase(LinuxKernelTestCase):
@contextlib.contextmanager
def with_default_prog(self):
try:
old_default_prog = drgn.get_default_prog()
except drgn.NoDefaultProgramError:
old_default_prog = None
try:
drgn.set_default_prog(self.prog)
yield
finally:
drgn.set_default_prog(old_default_prog)
# Run a crash command and capture its stdout and stderr.
def run_crash_command(self, command):
with contextlib.redirect_stdout(
io.StringIO()
) as stdout, contextlib.redirect_stderr(io.StringIO()) as stderr:
CRASH_COMMAND_NAMESPACE.run(self.prog, command)
return types.SimpleNamespace(stdout=stdout.getvalue(), stderr=stderr.getvalue())
# Run a crash command with --drgn. Capture its stdout and check that it
# doesn't write anything to stderr.
#
# mode must be "capture", "compile", or "exec".
#
# If mode is "compile" or "exec", check that it outputs valid, non-empty
# Python code.
#
# If mode is "exec", also execute the code and capture any globals it sets.
def run_crash_command_drgn_option(self, command, mode="exec"):
assert mode in {"capture", "compile", "exec"}
ret = self.run_crash_command(command + " --drgn")
self.assertFalse(ret.stderr)
if os.getenv("DRGN_TEST_LOG_CRASH_DRGN"):
sys.stderr.write(
f"""
{'=' * 88}
%crash {command} --drgn
{'-' * 88}
{ret.stdout}\
{'=' * 88}
"""
)
sys.stderr.flush()
if mode == "compile" or mode == "exec":
self.assertTrue(ret.stdout)
ret.code = compile(ret.stdout, command + " --drgn", "exec")
if mode == "exec":
ret.globals = {"prog": self.prog}
with self.with_default_prog():
exec(ret.stdout, ret.globals)
return ret
# Run a crash command with and without --drgn. mode is passed to
# run_crash_command_drgn_option().
def check_crash_command(self, command, mode="exec"):
drgn_option = self.run_crash_command_drgn_option(command, mode)
ret = self.run_crash_command(command)
if os.getenv("DRGN_TEST_LOG_CRASH_OUTPUT"):
sys.stderr.write(
f"""
{'=' * 88}
%crash {command}
{'-' * 88}
{ret.stdout}\
{'=' * 88}
"""
)
sys.stderr.flush()
ret.drgn_option = drgn_option
return ret
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