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717 lines
24 KiB
717 lines
24 KiB
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# Copyright 2011 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Utilities to run commands in outside/inside chroot and on the board."""
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from __future__ import print_function
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import getpass
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import os
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import re
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import select
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import signal
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import subprocess
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import sys
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import tempfile
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import time
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from cros_utils import logger
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mock_default = False
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CHROMEOS_SCRIPTS_DIR = '/mnt/host/source/src/scripts'
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LOG_LEVEL = ('none', 'quiet', 'average', 'verbose')
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def InitCommandExecuter(mock=False):
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# pylint: disable=global-statement
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global mock_default
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# Whether to default to a mock command executer or not
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mock_default = mock
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def GetCommandExecuter(logger_to_set=None, mock=False, log_level='verbose'):
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# If the default is a mock executer, always return one.
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if mock_default or mock:
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return MockCommandExecuter(log_level, logger_to_set)
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else:
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return CommandExecuter(log_level, logger_to_set)
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class CommandExecuter(object):
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"""Provides several methods to execute commands on several environments."""
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def __init__(self, log_level, logger_to_set=None):
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self.log_level = log_level
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if log_level == 'none':
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self.logger = None
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else:
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if logger_to_set is not None:
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self.logger = logger_to_set
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else:
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self.logger = logger.GetLogger()
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def GetLogLevel(self):
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return self.log_level
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def SetLogLevel(self, log_level):
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self.log_level = log_level
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def RunCommandGeneric(self,
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cmd,
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return_output=False,
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machine=None,
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username=None,
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command_terminator=None,
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command_timeout=None,
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terminated_timeout=10,
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print_to_console=True,
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env=None,
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except_handler=lambda p, e: None):
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"""Run a command.
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Returns triplet (returncode, stdout, stderr).
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"""
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cmd = str(cmd)
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if self.log_level == 'quiet':
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print_to_console = False
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if self.log_level == 'verbose':
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self.logger.LogCmd(cmd, machine, username, print_to_console)
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elif self.logger:
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self.logger.LogCmdToFileOnly(cmd, machine, username)
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if command_terminator and command_terminator.IsTerminated():
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if self.logger:
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self.logger.LogError('Command was terminated!', print_to_console)
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return (1, '', '')
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if machine is not None:
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user = ''
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if username is not None:
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user = username + '@'
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cmd = "ssh -t -t %s%s -- '%s'" % (user, machine, cmd)
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# We use setsid so that the child will have a different session id
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# and we can easily kill the process group. This is also important
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# because the child will be disassociated from the parent terminal.
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# In this way the child cannot mess the parent's terminal.
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p = None
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try:
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# pylint: disable=bad-option-value, subprocess-popen-preexec-fn
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p = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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shell=True,
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preexec_fn=os.setsid,
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executable='/bin/bash',
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env=env)
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full_stdout = ''
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full_stderr = ''
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# Pull output from pipes, send it to file/stdout/string
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out = err = None
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pipes = [p.stdout, p.stderr]
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my_poll = select.poll()
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my_poll.register(p.stdout, select.POLLIN)
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my_poll.register(p.stderr, select.POLLIN)
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terminated_time = None
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started_time = time.time()
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while pipes:
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if command_terminator and command_terminator.IsTerminated():
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os.killpg(os.getpgid(p.pid), signal.SIGTERM)
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if self.logger:
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self.logger.LogError(
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'Command received termination request. '
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'Killed child process group.', print_to_console)
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break
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l = my_poll.poll(100)
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for (fd, _) in l:
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if fd == p.stdout.fileno():
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out = os.read(p.stdout.fileno(), 16384).decode('utf8')
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if return_output:
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full_stdout += out
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if self.logger:
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self.logger.LogCommandOutput(out, print_to_console)
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if out == '':
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pipes.remove(p.stdout)
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my_poll.unregister(p.stdout)
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if fd == p.stderr.fileno():
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err = os.read(p.stderr.fileno(), 16384).decode('utf8')
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if return_output:
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full_stderr += err
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if self.logger:
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self.logger.LogCommandError(err, print_to_console)
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if err == '':
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pipes.remove(p.stderr)
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my_poll.unregister(p.stderr)
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if p.poll() is not None:
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if terminated_time is None:
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terminated_time = time.time()
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elif (terminated_timeout is not None and
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time.time() - terminated_time > terminated_timeout):
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if self.logger:
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self.logger.LogWarning(
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'Timeout of %s seconds reached since '
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'process termination.' % terminated_timeout, print_to_console)
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break
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if (command_timeout is not None and
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time.time() - started_time > command_timeout):
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os.killpg(os.getpgid(p.pid), signal.SIGTERM)
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if self.logger:
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self.logger.LogWarning(
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'Timeout of %s seconds reached since process'
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'started. Killed child process group.' % command_timeout,
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print_to_console)
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break
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if out == err == '':
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break
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p.wait()
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if return_output:
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return (p.returncode, full_stdout, full_stderr)
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return (p.returncode, '', '')
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except BaseException as err:
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except_handler(p, err)
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raise
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def RunCommand(self, *args, **kwargs):
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"""Run a command.
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Takes the same arguments as RunCommandGeneric except for return_output.
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Returns a single value returncode.
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 1
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assert 'return_output' not in kwargs
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kwargs['return_output'] = False
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return self.RunCommandGeneric(*args, **kwargs)[0]
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def RunCommandWExceptionCleanup(self, *args, **kwargs):
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"""Run a command and kill process if exception is thrown.
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Takes the same arguments as RunCommandGeneric except for except_handler.
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Returns same as RunCommandGeneric.
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"""
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def KillProc(proc, _):
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if proc:
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os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
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# Make sure that args does not overwrite 'except_handler'
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assert len(args) <= 8
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assert 'except_handler' not in kwargs
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kwargs['except_handler'] = KillProc
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return self.RunCommandGeneric(*args, **kwargs)
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def RunCommandWOutput(self, *args, **kwargs):
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"""Run a command.
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Takes the same arguments as RunCommandGeneric except for return_output.
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Returns a triplet (returncode, stdout, stderr).
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 1
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assert 'return_output' not in kwargs
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kwargs['return_output'] = True
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return self.RunCommandGeneric(*args, **kwargs)
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def RemoteAccessInitCommand(self, chromeos_root, machine, port=None):
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command = ''
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command += '\nset -- --remote=' + machine
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if port:
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command += ' --ssh_port=' + port
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command += '\n. ' + chromeos_root + '/src/scripts/common.sh'
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command += '\n. ' + chromeos_root + '/src/scripts/remote_access.sh'
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command += '\nTMP=$(mktemp -d)'
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command += '\nFLAGS "$@" || exit 1'
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command += '\nremote_access_init'
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return command
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def WriteToTempShFile(self, contents):
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with tempfile.NamedTemporaryFile(
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'w', encoding='utf-8', delete=False, prefix=os.uname()[1],
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suffix='.sh') as f:
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f.write('#!/bin/bash\n')
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f.write(contents)
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f.flush()
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return f.name
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def CrosLearnBoard(self, chromeos_root, machine):
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command = self.RemoteAccessInitCommand(chromeos_root, machine)
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command += '\nlearn_board'
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command += '\necho ${FLAGS_board}'
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retval, output, _ = self.RunCommandWOutput(command)
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if self.logger:
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self.logger.LogFatalIf(retval, 'learn_board command failed')
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elif retval:
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sys.exit(1)
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return output.split()[-1]
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def CrosRunCommandGeneric(self,
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cmd,
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return_output=False,
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machine=None,
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command_terminator=None,
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chromeos_root=None,
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command_timeout=None,
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terminated_timeout=10,
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print_to_console=True):
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"""Run a command on a ChromeOS box.
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Returns triplet (returncode, stdout, stderr).
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"""
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if self.log_level != 'verbose':
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print_to_console = False
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if self.logger:
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self.logger.LogCmd(cmd, print_to_console=print_to_console)
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self.logger.LogFatalIf(not machine, 'No machine provided!')
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self.logger.LogFatalIf(not chromeos_root, 'chromeos_root not given!')
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else:
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if not chromeos_root or not machine:
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sys.exit(1)
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chromeos_root = os.path.expanduser(chromeos_root)
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port = None
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if ':' in machine:
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machine, port = machine.split(':')
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# Write all commands to a file.
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command_file = self.WriteToTempShFile(cmd)
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retval = self.CopyFiles(
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command_file,
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command_file,
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dest_machine=machine,
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dest_port=port,
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command_terminator=command_terminator,
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chromeos_root=chromeos_root,
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dest_cros=True,
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recursive=False,
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print_to_console=print_to_console)
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if retval:
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if self.logger:
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self.logger.LogError('Could not run remote command on machine.'
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' Is the machine up?')
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return (retval, '', '')
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command = self.RemoteAccessInitCommand(chromeos_root, machine, port)
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command += '\nremote_sh bash %s' % command_file
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command += '\nl_retval=$?; echo "$REMOTE_OUT"; exit $l_retval'
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retval = self.RunCommandGeneric(
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command,
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return_output,
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command_terminator=command_terminator,
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command_timeout=command_timeout,
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terminated_timeout=terminated_timeout,
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print_to_console=print_to_console)
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if return_output:
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connect_signature = ('Initiating first contact with remote host\n' +
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'Connection OK\n')
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connect_signature_re = re.compile(connect_signature)
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modded_retval = list(retval)
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modded_retval[1] = connect_signature_re.sub('', retval[1])
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return modded_retval
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return retval
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def CrosRunCommand(self, *args, **kwargs):
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"""Run a command on a ChromeOS box.
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Takes the same arguments as CrosRunCommandGeneric except for return_output.
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Returns a single value returncode.
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 1
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assert 'return_output' not in kwargs
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kwargs['return_output'] = False
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return self.CrosRunCommandGeneric(*args, **kwargs)[0]
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def CrosRunCommandWOutput(self, *args, **kwargs):
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"""Run a command on a ChromeOS box.
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Takes the same arguments as CrosRunCommandGeneric except for return_output.
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Returns a triplet (returncode, stdout, stderr).
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 1
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assert 'return_output' not in kwargs
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kwargs['return_output'] = True
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return self.CrosRunCommandGeneric(*args, **kwargs)
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def ChrootRunCommandGeneric(self,
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chromeos_root,
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command,
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return_output=False,
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command_terminator=None,
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command_timeout=None,
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terminated_timeout=10,
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print_to_console=True,
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cros_sdk_options='',
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env=None):
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"""Runs a command within the chroot.
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Returns triplet (returncode, stdout, stderr).
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"""
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if self.log_level != 'verbose':
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print_to_console = False
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if self.logger:
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self.logger.LogCmd(command, print_to_console=print_to_console)
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with tempfile.NamedTemporaryFile(
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'w',
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encoding='utf-8',
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delete=False,
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dir=os.path.join(chromeos_root, 'src/scripts'),
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suffix='.sh',
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prefix='in_chroot_cmd') as f:
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f.write('#!/bin/bash\n')
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f.write(command)
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f.write('\n')
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f.flush()
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command_file = f.name
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os.chmod(command_file, 0o777)
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# if return_output is set, run a test command first to make sure that
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# the chroot already exists. We want the final returned output to skip
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# the output from chroot creation steps.
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if return_output:
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ret = self.RunCommand(
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'cd %s; cros_sdk %s -- true' % (chromeos_root, cros_sdk_options),
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env=env)
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if ret:
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return (ret, '', '')
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# Run command_file inside the chroot, making sure that any "~" is expanded
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# by the shell inside the chroot, not outside.
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command = ("cd %s; cros_sdk %s -- bash -c '%s/%s'" %
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(chromeos_root, cros_sdk_options, CHROMEOS_SCRIPTS_DIR,
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os.path.basename(command_file)))
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ret = self.RunCommandGeneric(
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command,
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return_output,
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command_terminator=command_terminator,
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command_timeout=command_timeout,
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terminated_timeout=terminated_timeout,
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print_to_console=print_to_console,
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env=env)
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os.remove(command_file)
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return ret
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def ChrootRunCommand(self, *args, **kwargs):
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"""Runs a command within the chroot.
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Takes the same arguments as ChrootRunCommandGeneric except for
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return_output.
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Returns a single value returncode.
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 2
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assert 'return_output' not in kwargs
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kwargs['return_output'] = False
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return self.ChrootRunCommandGeneric(*args, **kwargs)[0]
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def ChrootRunCommandWOutput(self, *args, **kwargs):
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"""Runs a command within the chroot.
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Takes the same arguments as ChrootRunCommandGeneric except for
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return_output.
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Returns a triplet (returncode, stdout, stderr).
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"""
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# Make sure that args does not overwrite 'return_output'
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assert len(args) <= 2
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assert 'return_output' not in kwargs
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kwargs['return_output'] = True
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return self.ChrootRunCommandGeneric(*args, **kwargs)
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def RunCommands(self,
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cmdlist,
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machine=None,
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username=None,
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command_terminator=None):
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cmd = ' ;\n'.join(cmdlist)
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return self.RunCommand(
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cmd,
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machine=machine,
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username=username,
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command_terminator=command_terminator)
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def CopyFiles(self,
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src,
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dest,
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src_machine=None,
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src_port=None,
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dest_machine=None,
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dest_port=None,
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src_user=None,
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dest_user=None,
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recursive=True,
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command_terminator=None,
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chromeos_root=None,
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src_cros=False,
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dest_cros=False,
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print_to_console=True):
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src = os.path.expanduser(src)
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dest = os.path.expanduser(dest)
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if recursive:
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src = src + '/'
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dest = dest + '/'
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if src_cros or dest_cros:
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if self.logger:
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self.logger.LogFatalIf(
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src_cros == dest_cros, 'Only one of src_cros and desc_cros can '
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'be True.')
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self.logger.LogFatalIf(not chromeos_root, 'chromeos_root not given!')
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elif src_cros == dest_cros or not chromeos_root:
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sys.exit(1)
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if src_cros:
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cros_machine = src_machine
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cros_port = src_port
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host_machine = dest_machine
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host_user = dest_user
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else:
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cros_machine = dest_machine
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cros_port = dest_port
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host_machine = src_machine
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host_user = src_user
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command = self.RemoteAccessInitCommand(chromeos_root, cros_machine,
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cros_port)
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ssh_command = ('ssh -o StrictHostKeyChecking=no' +
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' -o UserKnownHostsFile=$(mktemp)' +
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' -i $TMP_PRIVATE_KEY')
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if cros_port:
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ssh_command += ' -p %s' % cros_port
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rsync_prefix = '\nrsync -r -e "%s" ' % ssh_command
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if dest_cros:
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command += rsync_prefix + '%s root@%s:%s' % (src, cros_machine, dest)
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else:
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command += rsync_prefix + 'root@%s:%s %s' % (cros_machine, src, dest)
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return self.RunCommand(
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command,
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machine=host_machine,
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username=host_user,
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command_terminator=command_terminator,
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print_to_console=print_to_console)
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if dest_machine == src_machine:
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command = 'rsync -a %s %s' % (src, dest)
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else:
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if src_machine is None:
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src_machine = os.uname()[1]
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src_user = getpass.getuser()
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command = 'rsync -a %s@%s:%s %s' % (src_user, src_machine, src, dest)
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return self.RunCommand(
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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
|