# Copyright (C) 2013 Intel Corporation # # Released under the MIT license (see COPYING.MIT) # This module provides a class for starting qemu images using runqemu. # It's used by testimage.bbclass. import subprocess import os import sys import time import signal import re import socket import select import errno import string import threading import codecs from oeqa.utils.dump import HostDumper import logging logger = logging.getLogger("BitBake.QemuRunner") logger.addHandler(logging.StreamHandler()) # Get Unicode non printable control chars control_range = list(range(0,32))+list(range(127,160)) control_chars = [chr(x) for x in control_range if chr(x) not in string.printable] re_control_char = re.compile('[%s]' % re.escape("".join(control_chars))) class QemuRunner: def __init__(self, machine, rootfs, display, tmpdir, deploy_dir_image, logfile, boottime, dump_dir, dump_host_cmds, use_kvm): # Popen object for runqemu self.runqemu = None # pid of the qemu process that runqemu will start self.qemupid = None # target ip - from the command line self.ip = None # host ip - where qemu is running self.server_ip = None self.machine = machine self.rootfs = rootfs self.display = display self.tmpdir = tmpdir self.deploy_dir_image = deploy_dir_image self.logfile = logfile self.boottime = boottime self.logged = False self.thread = None self.use_kvm = use_kvm self.runqemutime = 60 self.host_dumper = HostDumper(dump_host_cmds, dump_dir) def create_socket(self): try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.setblocking(0) sock.bind(("127.0.0.1",0)) sock.listen(2) port = sock.getsockname()[1] logger.info("Created listening socket for qemu serial console on: 127.0.0.1:%s" % port) return (sock, port) except socket.error: sock.close() raise def log(self, msg): if self.logfile: # It is needed to sanitize the data received from qemu # because is possible to have control characters msg = msg.decode("utf-8") msg = re_control_char.sub('', msg) with codecs.open(self.logfile, "a", encoding="utf-8") as f: f.write("%s" % msg) def getOutput(self, o): import fcntl fl = fcntl.fcntl(o, fcntl.F_GETFL) fcntl.fcntl(o, fcntl.F_SETFL, fl | os.O_NONBLOCK) return os.read(o.fileno(), 1000000).decode("utf-8") def handleSIGCHLD(self, signum, frame): if self.runqemu and self.runqemu.poll(): if self.runqemu.returncode: logger.info('runqemu exited with code %d' % self.runqemu.returncode) logger.info("Output from runqemu:\n%s" % self.getOutput(self.runqemu.stdout)) self.stop() self._dump_host() raise SystemExit def start(self, qemuparams = None, get_ip = True, extra_bootparams = None): if self.display: os.environ["DISPLAY"] = self.display # Set this flag so that Qemu doesn't do any grabs as SDL grabs # interact badly with screensavers. os.environ["QEMU_DONT_GRAB"] = "1" if not os.path.exists(self.rootfs): logger.error("Invalid rootfs %s" % self.rootfs) return False if not os.path.exists(self.tmpdir): logger.error("Invalid TMPDIR path %s" % self.tmpdir) return False else: os.environ["OE_TMPDIR"] = self.tmpdir if not os.path.exists(self.deploy_dir_image): logger.error("Invalid DEPLOY_DIR_IMAGE path %s" % self.deploy_dir_image) return False else: os.environ["DEPLOY_DIR_IMAGE"] = self.deploy_dir_image try: threadsock, threadport = self.create_socket() self.server_socket, self.serverport = self.create_socket() except socket.error as msg: logger.error("Failed to create listening socket: %s" % msg[1]) return False bootparams = 'console=tty1 console=ttyS0,115200n8 printk.time=1' if extra_bootparams: bootparams = bootparams + ' ' + extra_bootparams self.qemuparams = 'bootparams="{0}" qemuparams="-serial tcp:127.0.0.1:{1}"'.format(bootparams, threadport) if not self.display: self.qemuparams = 'nographic ' + self.qemuparams if qemuparams: self.qemuparams = self.qemuparams[:-1] + " " + qemuparams + " " + '\"' self.origchldhandler = signal.getsignal(signal.SIGCHLD) signal.signal(signal.SIGCHLD, self.handleSIGCHLD) launch_cmd = 'runqemu snapshot ' if self.use_kvm: logger.info('Using kvm for runqemu') launch_cmd += 'kvm ' else: logger.info('Not using kvm for runqemu') launch_cmd += 'tcpserial=%s %s %s %s' % (self.serverport, self.machine, self.rootfs, self.qemuparams) logger.info('launchcmd=%s'%(launch_cmd)) # FIXME: We pass in stdin=subprocess.PIPE here to work around stty # blocking at the end of the runqemu script when using this within # oe-selftest (this makes stty error out immediately). There ought # to be a proper fix but this will suffice for now. self.runqemu = subprocess.Popen(launch_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, stdin=subprocess.PIPE, preexec_fn=os.setpgrp) output = self.runqemu.stdout # # We need the preexec_fn above so that all runqemu processes can easily be killed # (by killing their process group). This presents a problem if this controlling # process itself is killed however since those processes don't notice the death # of the parent and merrily continue on. # # Rather than hack runqemu to deal with this, we add something here instead. # Basically we fork off another process which holds an open pipe to the parent # and also is setpgrp. If/when the pipe sees EOF from the parent dieing, it kills # the process group. This is like pctrl's PDEATHSIG but for a process group # rather than a single process. # r, w = os.pipe() self.monitorpid = os.fork() if self.monitorpid: os.close(r) self.monitorpipe = os.fdopen(w, "w") else: # child process os.setpgrp() os.close(w) r = os.fdopen(r) x = r.read() os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM) sys.exit(0) logger.info("runqemu started, pid is %s" % self.runqemu.pid) logger.info("waiting at most %s seconds for qemu pid" % self.runqemutime) endtime = time.time() + self.runqemutime while not self.is_alive() and time.time() < endtime: if self.runqemu.poll(): if self.runqemu.returncode: # No point waiting any longer logger.info('runqemu exited with code %d' % self.runqemu.returncode) self._dump_host() self.stop() logger.info("Output from runqemu:\n%s" % self.getOutput(output)) return False time.sleep(1) if self.is_alive(): logger.info("qemu started - qemu procces pid is %s" % self.qemupid) if get_ip: cmdline = '' with open('/proc/%s/cmdline' % self.qemupid) as p: cmdline = p.read() # It is needed to sanitize the data received # because is possible to have control characters cmdline = re_control_char.sub('', cmdline) try: ips = re.findall("((?:[0-9]{1,3}\.){3}[0-9]{1,3})", cmdline.split("ip=")[1]) if not ips or len(ips) != 3: raise ValueError else: self.ip = ips[0] self.server_ip = ips[1] except (IndexError, ValueError): logger.info("Couldn't get ip from qemu process arguments! Here is the qemu command line used:\n%s\nand output from runqemu:\n%s" % (cmdline, self.getOutput(output))) self._dump_host() self.stop() return False logger.info("qemu cmdline used:\n{}".format(cmdline)) logger.info("Target IP: %s" % self.ip) logger.info("Server IP: %s" % self.server_ip) self.thread = LoggingThread(self.log, threadsock, logger) self.thread.start() if not self.thread.connection_established.wait(self.boottime): logger.error("Didn't receive a console connection from qemu. " "Here is the qemu command line used:\n%s\nand " "output from runqemu:\n%s" % (cmdline, self.getOutput(output))) self.stop_thread() return False logger.info("Output from runqemu:\n%s", self.getOutput(output)) logger.info("Waiting at most %d seconds for login banner" % self.boottime) endtime = time.time() + self.boottime socklist = [self.server_socket] reachedlogin = False stopread = False qemusock = None bootlog = '' data = b'' while time.time() < endtime and not stopread: sread, swrite, serror = select.select(socklist, [], [], 5) for sock in sread: if sock is self.server_socket: qemusock, addr = self.server_socket.accept() qemusock.setblocking(0) socklist.append(qemusock) socklist.remove(self.server_socket) logger.info("Connection from %s:%s" % addr) else: data = data + sock.recv(1024) if data: try: data = data.decode("utf-8", errors="surrogateescape") bootlog += data data = b'' if re.search(".* login:", bootlog): self.server_socket = qemusock stopread = True reachedlogin = True logger.info("Reached login banner") except UnicodeDecodeError: continue else: socklist.remove(sock) sock.close() stopread = True if not reachedlogin: logger.info("Target didn't reached login boot in %d seconds" % self.boottime) lines = "\n".join(bootlog.splitlines()[-25:]) logger.info("Last 25 lines of text:\n%s" % lines) logger.info("Check full boot log: %s" % self.logfile) self._dump_host() self.stop() return False # If we are not able to login the tests can continue try: (status, output) = self.run_serial("root\n", raw=True) if re.search("root@[a-zA-Z0-9\-]+:~#", output): self.logged = True logger.info("Logged as root in serial console") else: logger.info("Couldn't login into serial console" " as root using blank password") except: logger.info("Serial console failed while trying to login") else: logger.info("Qemu pid didn't appeared in %s seconds" % self.runqemutime) self._dump_host() self.stop() logger.info("Output from runqemu:\n%s" % self.getOutput(output)) return False return self.is_alive() def stop(self): self.stop_thread() if hasattr(self, "origchldhandler"): signal.signal(signal.SIGCHLD, self.origchldhandler) if self.runqemu: if hasattr(self, "monitorpid"): os.kill(self.monitorpid, signal.SIGKILL) logger.info("Sending SIGTERM to runqemu") try: os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM) except OSError as e: if e.errno != errno.ESRCH: raise endtime = time.time() + self.runqemutime while self.runqemu.poll() is None and time.time() < endtime: time.sleep(1) if self.runqemu.poll() is None: logger.info("Sending SIGKILL to runqemu") os.killpg(os.getpgid(self.runqemu.pid), signal.SIGKILL) self.runqemu = None if hasattr(self, 'server_socket') and self.server_socket: self.server_socket.close() self.server_socket = None self.qemupid = None self.ip = None def stop_thread(self): if self.thread and self.thread.is_alive(): self.thread.stop() self.thread.join() def restart(self, qemuparams = None): logger.info("Restarting qemu process") if self.runqemu.poll() is None: self.stop() if self.start(qemuparams): return True return False def is_alive(self): if not self.runqemu: return False qemu_child = self.find_child(str(self.runqemu.pid)) if qemu_child: self.qemupid = qemu_child[0] if os.path.exists("/proc/" + str(self.qemupid)): return True return False def find_child(self,parent_pid): # # Walk the process tree from the process specified looking for a qemu-system. Return its [pid'cmd] # ps = subprocess.Popen(['ps', 'axww', '-o', 'pid,ppid,command'], stdout=subprocess.PIPE).communicate()[0] processes = ps.decode("utf-8").split('\n') nfields = len(processes[0].split()) - 1 pids = {} commands = {} for row in processes[1:]: data = row.split(None, nfields) if len(data) != 3: continue if data[1] not in pids: pids[data[1]] = [] pids[data[1]].append(data[0]) commands[data[0]] = data[2] if parent_pid not in pids: return [] parents = [] newparents = pids[parent_pid] while newparents: next = [] for p in newparents: if p in pids: for n in pids[p]: if n not in parents and n not in next: next.append(n) if p not in parents: parents.append(p) newparents = next #print("Children matching %s:" % str(parents)) for p in parents: # Need to be careful here since runqemu runs "ldd qemu-system-xxxx" # Also, old versions of ldd (2.11) run "LD_XXXX qemu-system-xxxx" basecmd = commands[p].split()[0] basecmd = os.path.basename(basecmd) if "qemu-system" in basecmd and "-serial tcp" in commands[p]: return [int(p),commands[p]] def run_serial(self, command, raw=False): # We assume target system have echo to get command status if not raw: command = "%s; echo $?\n" % command data = '' status = 0 self.server_socket.sendall(command.encode('utf-8')) keepreading = True while keepreading: sread, _, _ = select.select([self.server_socket],[],[],5) if sread: answer = self.server_socket.recv(1024) if answer: data += answer.decode('utf-8') # Search the prompt to stop if re.search("[a-zA-Z0-9]+@[a-zA-Z0-9\-]+:~#", data): keepreading = False else: raise Exception("No data on serial console socket") else: keepreading = False if data: if raw: status = 1 else: # Remove first line (command line) and last line (prompt) data = data[data.find('$?\r\n')+4:data.rfind('\r\n')] index = data.rfind('\r\n') if index == -1: status_cmd = data data = "" else: status_cmd = data[index+2:] data = data[:index] if (status_cmd == "0"): status = 1 return (status, str(data)) def _dump_host(self): self.host_dumper.create_dir("qemu") logger.warn("Qemu ended unexpectedly, dump data from host" " is in %s" % self.host_dumper.dump_dir) self.host_dumper.dump_host() # This class is for reading data from a socket and passing it to logfunc # to be processed. It's completely event driven and has a straightforward # event loop. The mechanism for stopping the thread is a simple pipe which # will wake up the poll and allow for tearing everything down. class LoggingThread(threading.Thread): def __init__(self, logfunc, sock, logger): self.connection_established = threading.Event() self.serversock = sock self.logfunc = logfunc self.logger = logger self.readsock = None self.running = False self.errorevents = select.POLLERR | select.POLLHUP | select.POLLNVAL self.readevents = select.POLLIN | select.POLLPRI threading.Thread.__init__(self, target=self.threadtarget) def threadtarget(self): try: self.eventloop() finally: self.teardown() def run(self): self.logger.info("Starting logging thread") self.readpipe, self.writepipe = os.pipe() threading.Thread.run(self) def stop(self): self.logger.info("Stopping logging thread") if self.running: os.write(self.writepipe, bytes("stop", "utf-8")) def teardown(self): self.logger.info("Tearing down logging thread") self.close_socket(self.serversock) if self.readsock is not None: self.close_socket(self.readsock) self.close_ignore_error(self.readpipe) self.close_ignore_error(self.writepipe) self.running = False def eventloop(self): poll = select.poll() event_read_mask = self.errorevents | self.readevents poll.register(self.serversock.fileno()) poll.register(self.readpipe, event_read_mask) breakout = False self.running = True self.logger.info("Starting thread event loop") while not breakout: events = poll.poll() for event in events: # An error occurred, bail out if event[1] & self.errorevents: raise Exception(self.stringify_event(event[1])) # Event to stop the thread if self.readpipe == event[0]: self.logger.info("Stop event received") breakout = True break # A connection request was received elif self.serversock.fileno() == event[0]: self.logger.info("Connection request received") self.readsock, _ = self.serversock.accept() self.readsock.setblocking(0) poll.unregister(self.serversock.fileno()) poll.register(self.readsock.fileno(), event_read_mask) self.logger.info("Setting connection established event") self.connection_established.set() # Actual data to be logged elif self.readsock.fileno() == event[0]: data = self.recv(1024) self.logfunc(data) # Since the socket is non-blocking make sure to honor EAGAIN # and EWOULDBLOCK. def recv(self, count): try: data = self.readsock.recv(count) except socket.error as e: if e.errno == errno.EAGAIN or e.errno == errno.EWOULDBLOCK: return '' else: raise if data is None: raise Exception("No data on read ready socket") elif not data: # This actually means an orderly shutdown # happened. But for this code it counts as an # error since the connection shouldn't go away # until qemu exits. raise Exception("Console connection closed unexpectedly") return data def stringify_event(self, event): val = '' if select.POLLERR == event: val = 'POLLER' elif select.POLLHUP == event: val = 'POLLHUP' elif select.POLLNVAL == event: val = 'POLLNVAL' return val def close_socket(self, sock): sock.shutdown(socket.SHUT_RDWR) sock.close() def close_ignore_error(self, fd): try: os.close(fd) except OSError: pass