| #!/usr/bin/env python3 |
| # -*- coding: utf-8 -*- |
| # Copyright 2011 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """Utilities to run commands in outside/inside chroot and on the board.""" |
| |
| from __future__ import print_function |
| |
| import getpass |
| import os |
| import re |
| import select |
| import signal |
| import subprocess |
| import sys |
| import tempfile |
| import time |
| |
| from cros_utils import logger |
| |
| mock_default = False |
| |
| CHROMEOS_SCRIPTS_DIR = '/mnt/host/source/src/scripts' |
| LOG_LEVEL = ('none', 'quiet', 'average', 'verbose') |
| |
| |
| def InitCommandExecuter(mock=False): |
| # pylint: disable=global-statement |
| global mock_default |
| # Whether to default to a mock command executer or not |
| mock_default = mock |
| |
| |
| def GetCommandExecuter(logger_to_set=None, mock=False, log_level='verbose'): |
| # If the default is a mock executer, always return one. |
| if mock_default or mock: |
| return MockCommandExecuter(log_level, logger_to_set) |
| else: |
| return CommandExecuter(log_level, logger_to_set) |
| |
| |
| class CommandExecuter(object): |
| """Provides several methods to execute commands on several environments.""" |
| |
| def __init__(self, log_level, logger_to_set=None): |
| self.log_level = log_level |
| if log_level == 'none': |
| self.logger = None |
| else: |
| if logger_to_set is not None: |
| self.logger = logger_to_set |
| else: |
| self.logger = logger.GetLogger() |
| |
| def GetLogLevel(self): |
| return self.log_level |
| |
| def SetLogLevel(self, log_level): |
| self.log_level = log_level |
| |
| def RunCommandGeneric(self, |
| cmd, |
| return_output=False, |
| machine=None, |
| username=None, |
| command_terminator=None, |
| command_timeout=None, |
| terminated_timeout=10, |
| print_to_console=True, |
| env=None, |
| except_handler=lambda p, e: None): |
| """Run a command. |
| |
| Returns triplet (returncode, stdout, stderr). |
| """ |
| |
| cmd = str(cmd) |
| |
| if self.log_level == 'quiet': |
| print_to_console = False |
| |
| if self.log_level == 'verbose': |
| self.logger.LogCmd(cmd, machine, username, print_to_console) |
| elif self.logger: |
| self.logger.LogCmdToFileOnly(cmd, machine, username) |
| if command_terminator and command_terminator.IsTerminated(): |
| if self.logger: |
| self.logger.LogError('Command was terminated!', print_to_console) |
| return (1, '', '') |
| |
| if machine is not None: |
| user = '' |
| if username is not None: |
| user = username + '@' |
| cmd = "ssh -t -t %s%s -- '%s'" % (user, machine, cmd) |
| |
| # We use setsid so that the child will have a different session id |
| # and we can easily kill the process group. This is also important |
| # because the child will be disassociated from the parent terminal. |
| # In this way the child cannot mess the parent's terminal. |
| p = None |
| try: |
| # pylint: disable=bad-option-value, subprocess-popen-preexec-fn |
| p = subprocess.Popen( |
| cmd, |
| stdout=subprocess.PIPE, |
| stderr=subprocess.PIPE, |
| shell=True, |
| preexec_fn=os.setsid, |
| executable='/bin/bash', |
| env=env) |
| |
| full_stdout = '' |
| full_stderr = '' |
| |
| # Pull output from pipes, send it to file/stdout/string |
| out = err = None |
| pipes = [p.stdout, p.stderr] |
| |
| my_poll = select.poll() |
| my_poll.register(p.stdout, select.POLLIN) |
| my_poll.register(p.stderr, select.POLLIN) |
| |
| terminated_time = None |
| started_time = time.time() |
| |
| while pipes: |
| if command_terminator and command_terminator.IsTerminated(): |
| os.killpg(os.getpgid(p.pid), signal.SIGTERM) |
| if self.logger: |
| self.logger.LogError( |
| 'Command received termination request. ' |
| 'Killed child process group.', print_to_console) |
| break |
| |
| l = my_poll.poll(100) |
| for (fd, _) in l: |
| if fd == p.stdout.fileno(): |
| out = os.read(p.stdout.fileno(), 16384).decode('utf8') |
| if return_output: |
| full_stdout += out |
| if self.logger: |
| self.logger.LogCommandOutput(out, print_to_console) |
| if out == '': |
| pipes.remove(p.stdout) |
| my_poll.unregister(p.stdout) |
| if fd == p.stderr.fileno(): |
| err = os.read(p.stderr.fileno(), 16384).decode('utf8') |
| if return_output: |
| full_stderr += err |
| if self.logger: |
| self.logger.LogCommandError(err, print_to_console) |
| if err == '': |
| pipes.remove(p.stderr) |
| my_poll.unregister(p.stderr) |
| |
| if p.poll() is not None: |
| if terminated_time is None: |
| terminated_time = time.time() |
| elif (terminated_timeout is not None and |
| time.time() - terminated_time > terminated_timeout): |
| if self.logger: |
| self.logger.LogWarning( |
| 'Timeout of %s seconds reached since ' |
| 'process termination.' % terminated_timeout, print_to_console) |
| break |
| |
| if (command_timeout is not None and |
| time.time() - started_time > command_timeout): |
| os.killpg(os.getpgid(p.pid), signal.SIGTERM) |
| if self.logger: |
| self.logger.LogWarning( |
| 'Timeout of %s seconds reached since process' |
| 'started. Killed child process group.' % command_timeout, |
| print_to_console) |
| break |
| |
| if out == err == '': |
| break |
| |
| p.wait() |
| if return_output: |
| return (p.returncode, full_stdout, full_stderr) |
| return (p.returncode, '', '') |
| except BaseException as err: |
| except_handler(p, err) |
| raise |
| |
| def RunCommand(self, *args, **kwargs): |
| """Run a command. |
| |
| Takes the same arguments as RunCommandGeneric except for return_output. |
| Returns a single value returncode. |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 1 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = False |
| return self.RunCommandGeneric(*args, **kwargs)[0] |
| |
| def RunCommandWExceptionCleanup(self, *args, **kwargs): |
| """Run a command and kill process if exception is thrown. |
| |
| Takes the same arguments as RunCommandGeneric except for except_handler. |
| Returns same as RunCommandGeneric. |
| """ |
| |
| def KillProc(proc, _): |
| if proc: |
| os.killpg(os.getpgid(proc.pid), signal.SIGTERM) |
| |
| # Make sure that args does not overwrite 'except_handler' |
| assert len(args) <= 8 |
| assert 'except_handler' not in kwargs |
| kwargs['except_handler'] = KillProc |
| return self.RunCommandGeneric(*args, **kwargs) |
| |
| def RunCommandWOutput(self, *args, **kwargs): |
| """Run a command. |
| |
| Takes the same arguments as RunCommandGeneric except for return_output. |
| Returns a triplet (returncode, stdout, stderr). |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 1 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = True |
| return self.RunCommandGeneric(*args, **kwargs) |
| |
| def RemoteAccessInitCommand(self, chromeos_root, machine): |
| command = '' |
| command += '\nset -- --remote=' + machine |
| command += '\n. ' + chromeos_root + '/src/scripts/common.sh' |
| command += '\n. ' + chromeos_root + '/src/scripts/remote_access.sh' |
| command += '\nTMP=$(mktemp -d)' |
| command += '\nFLAGS "$@" || exit 1' |
| command += '\nremote_access_init' |
| return command |
| |
| def WriteToTempShFile(self, contents): |
| with tempfile.NamedTemporaryFile( |
| 'w', encoding='utf-8', delete=False, prefix=os.uname()[1], |
| suffix='.sh') as f: |
| f.write('#!/bin/bash\n') |
| f.write(contents) |
| f.flush() |
| return f.name |
| |
| def CrosLearnBoard(self, chromeos_root, machine): |
| command = self.RemoteAccessInitCommand(chromeos_root, machine) |
| command += '\nlearn_board' |
| command += '\necho ${FLAGS_board}' |
| retval, output, _ = self.RunCommandWOutput(command) |
| if self.logger: |
| self.logger.LogFatalIf(retval, 'learn_board command failed') |
| elif retval: |
| sys.exit(1) |
| return output.split()[-1] |
| |
| def CrosRunCommandGeneric(self, |
| cmd, |
| return_output=False, |
| machine=None, |
| command_terminator=None, |
| chromeos_root=None, |
| command_timeout=None, |
| terminated_timeout=10, |
| print_to_console=True): |
| """Run a command on a ChromeOS box. |
| |
| Returns triplet (returncode, stdout, stderr). |
| """ |
| |
| if self.log_level != 'verbose': |
| print_to_console = False |
| |
| if self.logger: |
| self.logger.LogCmd(cmd, print_to_console=print_to_console) |
| self.logger.LogFatalIf(not machine, 'No machine provided!') |
| self.logger.LogFatalIf(not chromeos_root, 'chromeos_root not given!') |
| else: |
| if not chromeos_root or not machine: |
| sys.exit(1) |
| chromeos_root = os.path.expanduser(chromeos_root) |
| |
| # Write all commands to a file. |
| command_file = self.WriteToTempShFile(cmd) |
| retval = self.CopyFiles( |
| command_file, |
| command_file, |
| dest_machine=machine, |
| command_terminator=command_terminator, |
| chromeos_root=chromeos_root, |
| dest_cros=True, |
| recursive=False, |
| print_to_console=print_to_console) |
| if retval: |
| if self.logger: |
| self.logger.LogError('Could not run remote command on machine.' |
| ' Is the machine up?') |
| return (retval, '', '') |
| |
| command = self.RemoteAccessInitCommand(chromeos_root, machine) |
| command += '\nremote_sh bash %s' % command_file |
| command += '\nl_retval=$?; echo "$REMOTE_OUT"; exit $l_retval' |
| retval = self.RunCommandGeneric( |
| command, |
| return_output, |
| command_terminator=command_terminator, |
| command_timeout=command_timeout, |
| terminated_timeout=terminated_timeout, |
| print_to_console=print_to_console) |
| if return_output: |
| connect_signature = ( |
| 'Initiating first contact with remote host\n' + 'Connection OK\n') |
| connect_signature_re = re.compile(connect_signature) |
| modded_retval = list(retval) |
| modded_retval[1] = connect_signature_re.sub('', retval[1]) |
| return modded_retval |
| return retval |
| |
| def CrosRunCommand(self, *args, **kwargs): |
| """Run a command on a ChromeOS box. |
| |
| Takes the same arguments as CrosRunCommandGeneric except for return_output. |
| Returns a single value returncode. |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 1 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = False |
| return self.CrosRunCommandGeneric(*args, **kwargs)[0] |
| |
| def CrosRunCommandWOutput(self, *args, **kwargs): |
| """Run a command on a ChromeOS box. |
| |
| Takes the same arguments as CrosRunCommandGeneric except for return_output. |
| Returns a triplet (returncode, stdout, stderr). |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 1 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = True |
| return self.CrosRunCommandGeneric(*args, **kwargs) |
| |
| def ChrootRunCommandGeneric(self, |
| chromeos_root, |
| command, |
| return_output=False, |
| command_terminator=None, |
| command_timeout=None, |
| terminated_timeout=10, |
| print_to_console=True, |
| cros_sdk_options='', |
| env=None): |
| """Runs a command within the chroot. |
| |
| Returns triplet (returncode, stdout, stderr). |
| """ |
| |
| if self.log_level != 'verbose': |
| print_to_console = False |
| |
| if self.logger: |
| self.logger.LogCmd(command, print_to_console=print_to_console) |
| |
| with tempfile.NamedTemporaryFile( |
| 'w', |
| encoding='utf-8', |
| delete=False, |
| dir=os.path.join(chromeos_root, 'src/scripts'), |
| suffix='.sh', |
| prefix='in_chroot_cmd') as f: |
| f.write('#!/bin/bash\n') |
| f.write(command) |
| f.write('\n') |
| f.flush() |
| |
| command_file = f.name |
| os.chmod(command_file, 0o777) |
| |
| # if return_output is set, run a dummy command first to make sure that |
| # the chroot already exists. We want the final returned output to skip |
| # the output from chroot creation steps. |
| if return_output: |
| ret = self.RunCommand( |
| 'cd %s; cros_sdk %s -- true' % (chromeos_root, cros_sdk_options), |
| env=env) |
| if ret: |
| return (ret, '', '') |
| |
| # Run command_file inside the chroot, making sure that any "~" is expanded |
| # by the shell inside the chroot, not outside. |
| command = ("cd %s; cros_sdk %s -- bash -c '%s/%s'" % |
| (chromeos_root, cros_sdk_options, CHROMEOS_SCRIPTS_DIR, |
| os.path.basename(command_file))) |
| ret = self.RunCommandGeneric( |
| command, |
| return_output, |
| command_terminator=command_terminator, |
| command_timeout=command_timeout, |
| terminated_timeout=terminated_timeout, |
| print_to_console=print_to_console, |
| env=env) |
| os.remove(command_file) |
| return ret |
| |
| def ChrootRunCommand(self, *args, **kwargs): |
| """Runs a command within the chroot. |
| |
| Takes the same arguments as ChrootRunCommandGeneric except for |
| return_output. |
| Returns a single value returncode. |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 2 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = False |
| return self.ChrootRunCommandGeneric(*args, **kwargs)[0] |
| |
| def ChrootRunCommandWOutput(self, *args, **kwargs): |
| """Runs a command within the chroot. |
| |
| Takes the same arguments as ChrootRunCommandGeneric except for |
| return_output. |
| Returns a triplet (returncode, stdout, stderr). |
| """ |
| # Make sure that args does not overwrite 'return_output' |
| assert len(args) <= 2 |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = True |
| return self.ChrootRunCommandGeneric(*args, **kwargs) |
| |
| def RunCommands(self, |
| cmdlist, |
| machine=None, |
| username=None, |
| command_terminator=None): |
| cmd = ' ;\n'.join(cmdlist) |
| return self.RunCommand( |
| cmd, |
| machine=machine, |
| username=username, |
| command_terminator=command_terminator) |
| |
| def CopyFiles(self, |
| src, |
| dest, |
| src_machine=None, |
| dest_machine=None, |
| src_user=None, |
| dest_user=None, |
| recursive=True, |
| command_terminator=None, |
| chromeos_root=None, |
| src_cros=False, |
| dest_cros=False, |
| print_to_console=True): |
| src = os.path.expanduser(src) |
| dest = os.path.expanduser(dest) |
| |
| if recursive: |
| src = src + '/' |
| dest = dest + '/' |
| |
| if src_cros or dest_cros: |
| if self.logger: |
| self.logger.LogFatalIf( |
| src_cros == dest_cros, 'Only one of src_cros and desc_cros can ' |
| 'be True.') |
| self.logger.LogFatalIf(not chromeos_root, 'chromeos_root not given!') |
| elif src_cros == dest_cros or not chromeos_root: |
| sys.exit(1) |
| if src_cros: |
| cros_machine = src_machine |
| else: |
| cros_machine = dest_machine |
| |
| command = self.RemoteAccessInitCommand(chromeos_root, cros_machine) |
| ssh_command = ( |
| 'ssh -o StrictHostKeyChecking=no' + ' -o UserKnownHostsFile=$(mktemp)' |
| + ' -i $TMP_PRIVATE_KEY') |
| rsync_prefix = '\nrsync -r -e "%s" ' % ssh_command |
| if dest_cros: |
| command += rsync_prefix + '%s root@%s:%s' % (src, dest_machine, dest) |
| return self.RunCommand( |
| command, |
| machine=src_machine, |
| username=src_user, |
| command_terminator=command_terminator, |
| print_to_console=print_to_console) |
| else: |
| command += rsync_prefix + 'root@%s:%s %s' % (src_machine, src, dest) |
| return self.RunCommand( |
| command, |
| machine=dest_machine, |
| username=dest_user, |
| command_terminator=command_terminator, |
| print_to_console=print_to_console) |
| |
| if dest_machine == src_machine: |
| command = 'rsync -a %s %s' % (src, dest) |
| else: |
| if src_machine is None: |
| src_machine = os.uname()[1] |
| src_user = getpass.getuser() |
| command = 'rsync -a %s@%s:%s %s' % (src_user, src_machine, src, dest) |
| return self.RunCommand( |
| command, |
| machine=dest_machine, |
| username=dest_user, |
| command_terminator=command_terminator, |
| print_to_console=print_to_console) |
| |
| def RunCommand2(self, |
| cmd, |
| cwd=None, |
| line_consumer=None, |
| timeout=None, |
| shell=True, |
| join_stderr=True, |
| env=None, |
| except_handler=lambda p, e: None): |
| """Run the command with an extra feature line_consumer. |
| |
| This version allow developers to provide a line_consumer which will be |
| fed execution output lines. |
| |
| A line_consumer is a callback, which is given a chance to run for each |
| line the execution outputs (either to stdout or stderr). The |
| line_consumer must accept one and exactly one dict argument, the dict |
| argument has these items - |
| 'line' - The line output by the binary. Notice, this string includes |
| the trailing '\n'. |
| 'output' - Whether this is a stdout or stderr output, values are either |
| 'stdout' or 'stderr'. When join_stderr is True, this value |
| will always be 'output'. |
| 'pobject' - The object used to control execution, for example, call |
| pobject.kill(). |
| |
| Note: As this is written, the stdin for the process executed is |
| not associated with the stdin of the caller of this routine. |
| |
| Args: |
| cmd: Command in a single string. |
| cwd: Working directory for execution. |
| line_consumer: A function that will ba called by this function. See above |
| for details. |
| timeout: terminate command after this timeout. |
| shell: Whether to use a shell for execution. |
| join_stderr: Whether join stderr to stdout stream. |
| env: Execution environment. |
| except_handler: Callback for when exception is thrown during command |
| execution. Passed process object and exception. |
| |
| Returns: |
| Execution return code. |
| |
| Raises: |
| child_exception: if fails to start the command process (missing |
| permission, no such file, etc) |
| """ |
| |
| class StreamHandler(object): |
| """Internal utility class.""" |
| |
| def __init__(self, pobject, fd, name, line_consumer): |
| self._pobject = pobject |
| self._fd = fd |
| self._name = name |
| self._buf = '' |
| self._line_consumer = line_consumer |
| |
| def read_and_notify_line(self): |
| t = os.read(fd, 1024) |
| self._buf = self._buf + t |
| self.notify_line() |
| |
| def notify_line(self): |
| p = self._buf.find('\n') |
| while p >= 0: |
| self._line_consumer( |
| line=self._buf[:p + 1], output=self._name, pobject=self._pobject) |
| if p < len(self._buf) - 1: |
| self._buf = self._buf[p + 1:] |
| p = self._buf.find('\n') |
| else: |
| self._buf = '' |
| p = -1 |
| break |
| |
| def notify_eos(self): |
| # Notify end of stream. The last line may not end with a '\n'. |
| if self._buf != '': |
| self._line_consumer( |
| line=self._buf, output=self._name, pobject=self._pobject) |
| self._buf = '' |
| |
| if self.log_level == 'verbose': |
| self.logger.LogCmd(cmd) |
| elif self.logger: |
| self.logger.LogCmdToFileOnly(cmd) |
| |
| # We use setsid so that the child will have a different session id |
| # and we can easily kill the process group. This is also important |
| # because the child will be disassociated from the parent terminal. |
| # In this way the child cannot mess the parent's terminal. |
| pobject = None |
| try: |
| # pylint: disable=bad-option-value, subprocess-popen-preexec-fn |
| pobject = subprocess.Popen( |
| cmd, |
| cwd=cwd, |
| bufsize=1024, |
| env=env, |
| shell=shell, |
| universal_newlines=True, |
| stdout=subprocess.PIPE, |
| stderr=subprocess.STDOUT if join_stderr else subprocess.PIPE, |
| preexec_fn=os.setsid) |
| |
| # We provide a default line_consumer |
| if line_consumer is None: |
| line_consumer = lambda **d: None |
| start_time = time.time() |
| poll = select.poll() |
| outfd = pobject.stdout.fileno() |
| poll.register(outfd, select.POLLIN | select.POLLPRI) |
| handlermap = { |
| outfd: StreamHandler(pobject, outfd, 'stdout', line_consumer) |
| } |
| if not join_stderr: |
| errfd = pobject.stderr.fileno() |
| poll.register(errfd, select.POLLIN | select.POLLPRI) |
| handlermap[errfd] = StreamHandler(pobject, errfd, 'stderr', |
| line_consumer) |
| while handlermap: |
| readables = poll.poll(300) |
| for (fd, evt) in readables: |
| handler = handlermap[fd] |
| if evt & (select.POLLPRI | select.POLLIN): |
| handler.read_and_notify_line() |
| elif evt & (select.POLLHUP | select.POLLERR | select.POLLNVAL): |
| handler.notify_eos() |
| poll.unregister(fd) |
| del handlermap[fd] |
| |
| if timeout is not None and (time.time() - start_time > timeout): |
| os.killpg(os.getpgid(pobject.pid), signal.SIGTERM) |
| |
| return pobject.wait() |
| except BaseException as err: |
| except_handler(pobject, err) |
| raise |
| |
| |
| class MockCommandExecuter(CommandExecuter): |
| """Mock class for class CommandExecuter.""" |
| |
| def RunCommandGeneric(self, |
| cmd, |
| return_output=False, |
| machine=None, |
| username=None, |
| command_terminator=None, |
| command_timeout=None, |
| terminated_timeout=10, |
| print_to_console=True, |
| env=None, |
| except_handler=lambda p, e: None): |
| assert not command_timeout |
| cmd = str(cmd) |
| if machine is None: |
| machine = 'localhost' |
| if username is None: |
| username = 'current' |
| logger.GetLogger().LogCmd('(Mock) ' + cmd, machine, username, |
| print_to_console) |
| return (0, '', '') |
| |
| def RunCommand(self, *args, **kwargs): |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = False |
| return self.RunCommandGeneric(*args, **kwargs)[0] |
| |
| def RunCommandWOutput(self, *args, **kwargs): |
| assert 'return_output' not in kwargs |
| kwargs['return_output'] = True |
| return self.RunCommandGeneric(*args, **kwargs) |
| |
| |
| class CommandTerminator(object): |
| """Object to request termination of a command in execution.""" |
| |
| def __init__(self): |
| self.terminated = False |
| |
| def Terminate(self): |
| self.terminated = True |
| |
| def IsTerminated(self): |
| return self.terminated |
