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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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import json as _jsonimport osimport reimport selectimport socketimport subprocessimport time
class CmdInitFailure(Exception): """ Command failed to start. Only raised by bkg(). """ def __init__(self, msg, cmd_obj): super().__init__(msg + "\n" + repr(cmd_obj)) self.cmd = cmd_obj
class CmdExitFailure(Exception): """ Command failed (returned non-zero exit code). """ def __init__(self, msg, cmd_obj): super().__init__(msg + "\n" + repr(cmd_obj)) self.cmd = cmd_obj
class CmdExitZeroFailure(CmdExitFailure): """ Command succeeded (returned zero exit code), but expected failure. """
def fd_read_timeout(fd, timeout): rlist, _, _ = select.select([fd], [], [], timeout) if rlist: return os.read(fd, 1024) raise TimeoutError("Timeout waiting for fd read")
class cmd: """ Execute a command on local or remote host.
@shell defaults to false, and class will try to split @comm into a list if it's a string with spaces.
Use bkg() instead to run a command in the background. """ def __init__(self, comm, shell=None, fail=True, expect_fail=False, ns=None, background=False, host=None, timeout=20, ksft_ready=None, ksft_wait=None): if ns: if hasattr(ns, 'user_ns_path'): comm = (f'nsenter --user={ns.user_ns_path} ' f'--net={ns.net_ns_path} --setuid=0 --setgid=0 -- ' + comm) else: comm = f'ip netns exec {ns} ' + comm
self.stdout = None self.stderr = None self.ret = None self.ksft_term_fd = None
self.host = host self.comm = comm
if host: self.proc = host.cmd(comm) else: # If user doesn't explicitly request shell try to avoid it. if shell is None and isinstance(comm, str) and ' ' in comm: comm = comm.split()
# ksft_wait lets us wait for the background process to fully start, # we pass an FD to the child process, and wait for it to write back. # Similarly term_fd tells child it's time to exit. pass_fds = [] env = os.environ.copy() if ksft_wait is not None: wait_fd, self.ksft_term_fd = os.pipe() pass_fds.append(wait_fd) env["KSFT_WAIT_FD"] = str(wait_fd) ksft_ready = True # ksft_wait implies ready if ksft_ready is not None: rfd, ready_fd = os.pipe() pass_fds.append(ready_fd) env["KSFT_READY_FD"] = str(ready_fd)
self.proc = subprocess.Popen(comm, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE, pass_fds=pass_fds, env=env) if ksft_wait is not None: os.close(wait_fd) if ksft_ready is not None: os.close(ready_fd) msg = fd_read_timeout(rfd, ksft_wait) os.close(rfd) if not msg: terminate = self.proc.poll() is None self._process_terminate(terminate=terminate, timeout=1) raise CmdInitFailure("Did not receive ready message", self) if not background: self.process(terminate=False, fail=fail, expect_fail=expect_fail, timeout=timeout)
def _process_terminate(self, terminate, timeout): if terminate: self.proc.terminate() stdout, stderr = self.proc.communicate(timeout=timeout) self.stdout = stdout.decode("utf-8") self.stderr = stderr.decode("utf-8") self.proc.stdout.close() self.proc.stderr.close() self.ret = self.proc.returncode
return stdout, stderr
def process(self, terminate=True, fail=None, expect_fail=False, timeout=20): if fail is None: fail = not terminate
if self.ksft_term_fd: os.write(self.ksft_term_fd, b"1")
stdout, stderr = self._process_terminate(terminate=terminate, timeout=timeout)
# Fail on unexpected test failure if fail. # Fail on unexpected test success if expect_fail. # Fail on negative returncode if either: # Set by subprocess on crash or signal, this is never expected failure. if (self.proc.returncode != 0 and fail or (self.proc.returncode < 0 and expect_fail)): if len(stderr) > 0 and stderr[-1] == "\n": stderr = stderr[:-1] raise CmdExitFailure("Command failed", self) elif self.proc.returncode == 0 and expect_fail: raise CmdExitZeroFailure("Command succeeded (expected fail)", self)
def __repr__(self): def str_fmt(name, s): name += ': ' return (name + s.strip().replace('\n', '\n' + ' ' * len(name)))
ret = "CMD" if self.host: ret += "[remote]" if self.ret is None: ret += f" (unterminated): {self.comm}\n" elif self.ret == 0: ret += f" (success): {self.comm}\n" else: ret += f": {self.comm}\n" ret += f" EXIT: {self.ret}\n" if self.stdout: ret += str_fmt(" STDOUT", self.stdout) + "\n" if self.stderr: ret += str_fmt(" STDERR", self.stderr) + "\n" return ret.strip()
class bkg(cmd): """ Run a command in the background.
Examples usage:
Run a command on remote host, and wait for it to finish. This is usually paired with wait_port_listen() to make sure the command has initialized:
with bkg("socat ...", exit_wait=True, host=cfg.remote) as nc: ...
Run a command and expect it to let us know that it's ready by writing to a special file descriptor passed via KSFT_READY_FD. Command will be terminated when we exit the context manager:
with bkg("my_binary", ksft_wait=5): """ def __init__(self, comm, shell=None, fail=None, expect_fail=None, ns=None, host=None, exit_wait=False, ksft_ready=None, ksft_wait=None): super().__init__(comm, background=True, shell=shell, fail=fail, expect_fail=expect_fail, ns=ns, host=host, ksft_ready=ksft_ready, ksft_wait=ksft_wait) self.terminate = not exit_wait and not ksft_wait self._exit_wait = exit_wait self.check_fail = fail self.expect_fail = expect_fail
if shell and self.terminate: print("# Warning: combining shell and terminate is risky!") print("# SIGTERM may not reach the child on zsh/ksh!")
def __enter__(self): return self
def __exit__(self, ex_type, ex_value, ex_tb): terminate = self.terminate # Force termination on exception, but only if bkg() didn't already exit # since forcing termination silences failures with fail=None if self.proc.poll() is None: terminate = terminate or (self._exit_wait and ex_type is not None) return self.process(terminate=terminate, fail=self.check_fail, expect_fail=self.expect_fail)
GLOBAL_DEFER_QUEUE = []GLOBAL_DEFER_ARMED = False
class defer: def __init__(self, func, *args, **kwargs): if not callable(func): raise Exception("defer created with un-callable object, did you call the function instead of passing its name?")
self.func = func self.args = args self.kwargs = kwargs
if not GLOBAL_DEFER_ARMED: raise Exception("defer queue not armed, did you use defer() outside of a test case?") self._queue = GLOBAL_DEFER_QUEUE self._queue.append(self)
def __enter__(self): return self
def __exit__(self, ex_type, ex_value, ex_tb): return self.exec()
def exec_only(self): self.func(*self.args, **self.kwargs)
def cancel(self): self._queue.remove(self)
def exec(self): self.cancel() self.exec_only()
def tool(name, args, json=None, ns=None, host=None): cmd_str = name + ' ' if json: if name == 'tc': cmd_str += '-json ' else: cmd_str += '--json ' cmd_str += args cmd_obj = cmd(cmd_str, ns=ns, host=host) if json: return _json.loads(cmd_obj.stdout) return cmd_obj
def bpftool(args, json=None, ns=None, host=None): return tool('bpftool', args, json=json, ns=ns, host=host)
def ip(args, json=None, ns=None, host=None): if ns: args = f'-netns {ns} ' + args return tool('ip', args, json=json, host=host)
def tc(args, json=None, ns=None, host=None): """ Helper to call tc with standard set of optional args. """ if ns: args = f'-netns {ns} ' + args return tool('tc', args, json=json, host=host)
def ethtool(args, json=None, ns=None, host=None): return tool('ethtool', args, json=json, ns=ns, host=host)
def bpftrace(expr, json=None, ns=None, host=None, timeout=None): """ Run bpftrace and return map data (if json=True). The output of bpftrace is inconvenient, so the helper converts to a dict indexed by map name, e.g.: { "@": { ... }, "@map2": { ... }, } """ cmd_arr = ['bpftrace'] # Throw in --quiet if json, otherwise the output has two objects if json: cmd_arr += ['-f', 'json', '-q'] if timeout: expr += ' interval:s:' + str(timeout) + ' { exit(); }' timeout += 20 cmd_arr += ['-e', expr] cmd_obj = cmd(cmd_arr, ns=ns, host=host, shell=False, timeout=timeout) if json: # bpftrace prints objects as lines ret = {} for l in cmd_obj.stdout.split('\n'): if not l.strip(): continue one = _json.loads(l) if one.get('type') != 'map': continue for k, v in one["data"].items(): if k.startswith('@'): k = k.lstrip('@') ret[k] = v return ret return cmd_obj
def rand_port(stype=socket.SOCK_STREAM): """ Get a random unprivileged port. """ return rand_ports(1, stype)[0]
def rand_ports(count, stype=socket.SOCK_STREAM): """ Get a unique set of random unprivileged ports. """ sockets = [] ports = []
try: for _ in range(count): s = socket.socket(socket.AF_INET6, stype) sockets.append(s) s.bind(("", 0)) ports.append(s.getsockname()[1]) finally: for s in sockets: s.close()
return ports
def wait_port_listen(port, proto="tcp", ns=None, host=None, sleep=0.005, deadline=5): end = time.monotonic() + deadline
pattern = f":{port:04X} .* " if proto == "tcp": # for tcp protocol additionally check the socket state pattern += "0A" pattern = re.compile(pattern)
while True: data = cmd(f'cat /proc/net/{proto}*', ns=ns, host=host, shell=True).stdout for row in data.split("\n"): if pattern.search(row): return if time.monotonic() > end: raise Exception("Waiting for port listen timed out") time.sleep(sleep)
def wait_file(fname, test_fn, sleep=0.005, deadline=5, encoding='utf-8'): """ Wait for file contents on the local system to satisfy a condition. test_fn() should take one argument (file contents) and return whether condition is met. """ end = time.monotonic() + deadline
with open(fname, "r", encoding=encoding) as fp: while True: if test_fn(fp.read()): break fp.seek(0) if time.monotonic() > end: raise TimeoutError("Wait for file contents failed", fname) time.sleep(sleep)