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'''Pexpect is a Python module for spawning child applications and controlling
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them automatically. Pexpect can be used for automating interactive applications
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such as ssh, ftp, passwd, telnet, etc. It can be used to a automate setup
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scripts for duplicating software package installations on different servers. It
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can be used for automated software testing. Pexpect is in the spirit of Don
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Libes' Expect, but Pexpect is pure Python. Other Expect-like modules for Python
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require TCL and Expect or require C extensions to be compiled. Pexpect does not
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use C, Expect, or TCL extensions. It should work on any platform that supports
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the standard Python pty module. The Pexpect interface focuses on ease of use so
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that simple tasks are easy.
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There are two main interfaces to the Pexpect system; these are the function,
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run() and the class, spawn. The spawn class is more powerful. The run()
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function is simpler than spawn, and is good for quickly calling program. When
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you call the run() function it executes a given program and then returns the
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output. This is a handy replacement for os.system().
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For example::
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pexpect.run('ls -la')
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The spawn class is the more powerful interface to the Pexpect system. You can
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use this to spawn a child program then interact with it by sending input and
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expecting responses (waiting for patterns in the child's output).
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For example::
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child = pexpect.spawn('scp foo user@example.com:.')
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child.expect('Password:')
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child.sendline(mypassword)
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This works even for commands that ask for passwords or other input outside of
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the normal stdio streams. For example, ssh reads input directly from the TTY
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device which bypasses stdin.
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Credits: Noah Spurrier, Richard Holden, Marco Molteni, Kimberley Burchett,
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Robert Stone, Hartmut Goebel, Chad Schroeder, Erick Tryzelaar, Dave Kirby, Ids
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vander Molen, George Todd, Noel Taylor, Nicolas D. Cesar, Alexander Gattin,
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Jacques-Etienne Baudoux, Geoffrey Marshall, Francisco Lourenco, Glen Mabey,
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Karthik Gurusamy, Fernando Perez, Corey Minyard, Jon Cohen, Guillaume
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Chazarain, Andrew Ryan, Nick Craig-Wood, Andrew Stone, Jorgen Grahn, John
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Spiegel, Jan Grant, and Shane Kerr. Let me know if I forgot anyone.
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Pexpect is free, open source, and all that good stuff.
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http://pexpect.sourceforge.net/
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PEXPECT LICENSE
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This license is approved by the OSI and FSF as GPL-compatible.
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http://opensource.org/licenses/isc-license.txt
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Copyright (c) 2012, Noah Spurrier <noah@noah.org>
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PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
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PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
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COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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'''
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try:
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import os
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import sys
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import time
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import select
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import re
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import struct
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import resource
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import types
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import pty
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import tty
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import termios
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import fcntl
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import errno
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import traceback
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import signal
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import codecs
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except ImportError: # pragma: no cover
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err = sys.exc_info()[1]
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raise ImportError(str(err) + '''
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A critical module was not found. Probably this operating system does not
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support it. Pexpect is intended for UNIX-like operating systems.''')
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__version__ = '3.2'
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__revision__ = ''
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__all__ = ['ExceptionPexpect', 'EOF', 'TIMEOUT', 'spawn', 'spawnu', 'run', 'runu',
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'which', 'split_command_line', '__version__', '__revision__']
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PY3 = (sys.version_info[0] >= 3)
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# Exception classes used by this module.
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class ExceptionPexpect(Exception):
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'''Base class for all exceptions raised by this module.
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'''
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def __init__(self, value):
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super(ExceptionPexpect, self).__init__(value)
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self.value = value
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def __str__(self):
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return str(self.value)
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def get_trace(self):
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'''This returns an abbreviated stack trace with lines that only concern
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the caller. In other words, the stack trace inside the Pexpect module
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is not included. '''
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tblist = traceback.extract_tb(sys.exc_info()[2])
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tblist = [item for item in tblist if 'pexpect/__init__' not in item[0]]
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tblist = traceback.format_list(tblist)
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return ''.join(tblist)
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class EOF(ExceptionPexpect):
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'''Raised when EOF is read from a child.
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This usually means the child has exited.'''
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class TIMEOUT(ExceptionPexpect):
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'''Raised when a read time exceeds the timeout. '''
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##class TIMEOUT_PATTERN(TIMEOUT):
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## '''Raised when the pattern match time exceeds the timeout.
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## This is different than a read TIMEOUT because the child process may
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## give output, thus never give a TIMEOUT, but the output
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## may never match a pattern.
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## '''
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##class MAXBUFFER(ExceptionPexpect):
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## '''Raised when a buffer fills before matching an expected pattern.'''
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def run(command, timeout=-1, withexitstatus=False, events=None,
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extra_args=None, logfile=None, cwd=None, env=None):
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'''
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This function runs the given command; waits for it to finish; then
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returns all output as a string. STDERR is included in output. If the full
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path to the command is not given then the path is searched.
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Note that lines are terminated by CR/LF (\\r\\n) combination even on
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UNIX-like systems because this is the standard for pseudottys. If you set
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'withexitstatus' to true, then run will return a tuple of (command_output,
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exitstatus). If 'withexitstatus' is false then this returns just
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command_output.
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The run() function can often be used instead of creating a spawn instance.
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For example, the following code uses spawn::
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from pexpect import *
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child = spawn('scp foo user@example.com:.')
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child.expect('(?i)password')
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child.sendline(mypassword)
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The previous code can be replace with the following::
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from pexpect import *
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run('scp foo user@example.com:.', events={'(?i)password': mypassword})
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**Examples**
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Start the apache daemon on the local machine::
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from pexpect import *
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run("/usr/local/apache/bin/apachectl start")
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Check in a file using SVN::
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from pexpect import *
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run("svn ci -m 'automatic commit' my_file.py")
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Run a command and capture exit status::
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from pexpect import *
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(command_output, exitstatus) = run('ls -l /bin', withexitstatus=1)
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The following will run SSH and execute 'ls -l' on the remote machine. The
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password 'secret' will be sent if the '(?i)password' pattern is ever seen::
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run("ssh username@machine.example.com 'ls -l'",
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events={'(?i)password':'secret\\n'})
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This will start mencoder to rip a video from DVD. This will also display
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progress ticks every 5 seconds as it runs. For example::
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from pexpect import *
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def print_ticks(d):
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print d['event_count'],
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run("mencoder dvd://1 -o video.avi -oac copy -ovc copy",
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events={TIMEOUT:print_ticks}, timeout=5)
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The 'events' argument should be a dictionary of patterns and responses.
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Whenever one of the patterns is seen in the command out run() will send the
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associated response string. Note that you should put newlines in your
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string if Enter is necessary. The responses may also contain callback
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functions. Any callback is function that takes a dictionary as an argument.
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The dictionary contains all the locals from the run() function, so you can
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access the child spawn object or any other variable defined in run()
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(event_count, child, and extra_args are the most useful). A callback may
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return True to stop the current run process otherwise run() continues until
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the next event. A callback may also return a string which will be sent to
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the child. 'extra_args' is not used by directly run(). It provides a way to
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pass data to a callback function through run() through the locals
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dictionary passed to a callback.
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'''
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return _run(command, timeout=timeout, withexitstatus=withexitstatus,
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events=events, extra_args=extra_args, logfile=logfile, cwd=cwd,
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env=env, _spawn=spawn)
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def runu(command, timeout=-1, withexitstatus=False, events=None,
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extra_args=None, logfile=None, cwd=None, env=None, **kwargs):
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"""This offers the same interface as :func:`run`, but using unicode.
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Like :class:`spawnu`, you can pass ``encoding`` and ``errors`` parameters,
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which will be used for both input and output.
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"""
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return _run(command, timeout=timeout, withexitstatus=withexitstatus,
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events=events, extra_args=extra_args, logfile=logfile, cwd=cwd,
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env=env, _spawn=spawnu, **kwargs)
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def _run(command, timeout, withexitstatus, events, extra_args, logfile, cwd,
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env, _spawn, **kwargs):
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if timeout == -1:
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child = _spawn(command, maxread=2000, logfile=logfile, cwd=cwd, env=env,
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**kwargs)
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else:
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child = _spawn(command, timeout=timeout, maxread=2000, logfile=logfile,
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cwd=cwd, env=env, **kwargs)
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if events is not None:
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patterns = list(events.keys())
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responses = list(events.values())
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else:
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# This assumes EOF or TIMEOUT will eventually cause run to terminate.
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patterns = None
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responses = None
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child_result_list = []
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event_count = 0
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while True:
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try:
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index = child.expect(patterns)
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if isinstance(child.after, child.allowed_string_types):
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child_result_list.append(child.before + child.after)
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else:
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# child.after may have been a TIMEOUT or EOF,
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# which we don't want appended to the list.
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child_result_list.append(child.before)
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if isinstance(responses[index], child.allowed_string_types):
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child.send(responses[index])
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elif isinstance(responses[index], types.FunctionType):
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callback_result = responses[index](locals())
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sys.stdout.flush()
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if isinstance(callback_result, child.allowed_string_types):
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child.send(callback_result)
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elif callback_result:
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break
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else:
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raise TypeError('The callback must be a string or function.')
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event_count = event_count + 1
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except TIMEOUT:
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child_result_list.append(child.before)
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break
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except EOF:
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child_result_list.append(child.before)
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break
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child_result = child.string_type().join(child_result_list)
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if withexitstatus:
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child.close()
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return (child_result, child.exitstatus)
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else:
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return child_result
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class spawn(object):
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'''This is the main class interface for Pexpect. Use this class to start
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and control child applications. '''
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string_type = bytes
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if PY3:
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allowed_string_types = (bytes, str)
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@staticmethod
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def _chr(c):
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return bytes([c])
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linesep = os.linesep.encode('ascii')
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@staticmethod
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def write_to_stdout(b):
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try:
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return sys.stdout.buffer.write(b)
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except AttributeError:
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# If stdout has been replaced, it may not have .buffer
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return sys.stdout.write(b.decode('ascii', 'replace'))
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else:
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allowed_string_types = (basestring,) # analysis:ignore
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_chr = staticmethod(chr)
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linesep = os.linesep
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write_to_stdout = sys.stdout.write
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encoding = None
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def __init__(self, command, args=[], timeout=30, maxread=2000,
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searchwindowsize=None, logfile=None, cwd=None, env=None,
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ignore_sighup=True):
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'''This is the constructor. The command parameter may be a string that
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includes a command and any arguments to the command. For example::
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child = pexpect.spawn('/usr/bin/ftp')
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child = pexpect.spawn('/usr/bin/ssh user@example.com')
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child = pexpect.spawn('ls -latr /tmp')
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You may also construct it with a list of arguments like so::
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child = pexpect.spawn('/usr/bin/ftp', [])
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child = pexpect.spawn('/usr/bin/ssh', ['user@example.com'])
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child = pexpect.spawn('ls', ['-latr', '/tmp'])
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After this the child application will be created and will be ready to
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talk to. For normal use, see expect() and send() and sendline().
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Remember that Pexpect does NOT interpret shell meta characters such as
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redirect, pipe, or wild cards (``>``, ``|``, or ``*``). This is a
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common mistake. If you want to run a command and pipe it through
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another command then you must also start a shell. For example::
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child = pexpect.spawn('/bin/bash -c "ls -l | grep LOG > logs.txt"')
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child.expect(pexpect.EOF)
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The second form of spawn (where you pass a list of arguments) is useful
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|
in situations where you wish to spawn a command and pass it its own
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|
argument list. This can make syntax more clear. For example, the
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following is equivalent to the previous example::
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|
shell_cmd = 'ls -l | grep LOG > logs.txt'
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child = pexpect.spawn('/bin/bash', ['-c', shell_cmd])
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child.expect(pexpect.EOF)
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The maxread attribute sets the read buffer size. This is maximum number
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|
of bytes that Pexpect will try to read from a TTY at one time. Setting
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|
the maxread size to 1 will turn off buffering. Setting the maxread
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|
value higher may help performance in cases where large amounts of
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|
|
output are read back from the child. This feature is useful in
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|
conjunction with searchwindowsize.
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The searchwindowsize attribute sets the how far back in the incoming
|
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|
seach buffer Pexpect will search for pattern matches. Every time
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|
Pexpect reads some data from the child it will append the data to the
|
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|
incoming buffer. The default is to search from the beginning of the
|
|
|
incoming buffer each time new data is read from the child. But this is
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|
very inefficient if you are running a command that generates a large
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|
|
amount of data where you want to match. The searchwindowsize does not
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|
|
affect the size of the incoming data buffer. You will still have
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|
access to the full buffer after expect() returns.
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|
|
The logfile member turns on or off logging. All input and output will
|
|
|
be copied to the given file object. Set logfile to None to stop
|
|
|
logging. This is the default. Set logfile to sys.stdout to echo
|
|
|
everything to standard output. The logfile is flushed after each write.
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|
Example log input and output to a file::
|
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|
|
child = pexpect.spawn('some_command')
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|
|
fout = file('mylog.txt','w')
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|
|
child.logfile = fout
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|
Example log to stdout::
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|
|
child = pexpect.spawn('some_command')
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|
|
child.logfile = sys.stdout
|
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|
|
|
The logfile_read and logfile_send members can be used to separately log
|
|
|
the input from the child and output sent to the child. Sometimes you
|
|
|
don't want to see everything you write to the child. You only want to
|
|
|
log what the child sends back. For example::
|
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|
|
child = pexpect.spawn('some_command')
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|
|
child.logfile_read = sys.stdout
|
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|
|
|
To separately log output sent to the child use logfile_send::
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|
|
|
|
|
self.logfile_send = fout
|
|
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|
|
|
If ``ignore_sighup`` is True, the child process will ignore SIGHUP
|
|
|
signals. For now, the default is True, to preserve the behaviour of
|
|
|
earlier versions of Pexpect, but you should pass this explicitly if you
|
|
|
want to rely on it.
|
|
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|
|
|
The delaybeforesend helps overcome a weird behavior that many users
|
|
|
were experiencing. The typical problem was that a user would expect() a
|
|
|
"Password:" prompt and then immediately call sendline() to send the
|
|
|
password. The user would then see that their password was echoed back
|
|
|
to them. Passwords don't normally echo. The problem is caused by the
|
|
|
fact that most applications print out the "Password" prompt and then
|
|
|
turn off stdin echo, but if you send your password before the
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|
|
application turned off echo, then you get your password echoed.
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|
|
Normally this wouldn't be a problem when interacting with a human at a
|
|
|
real keyboard. If you introduce a slight delay just before writing then
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|
|
this seems to clear up the problem. This was such a common problem for
|
|
|
many users that I decided that the default pexpect behavior should be
|
|
|
to sleep just before writing to the child application. 1/20th of a
|
|
|
second (50 ms) seems to be enough to clear up the problem. You can set
|
|
|
delaybeforesend to 0 to return to the old behavior. Most Linux machines
|
|
|
don't like this to be below 0.03. I don't know why.
|
|
|
|
|
|
Note that spawn is clever about finding commands on your path.
|
|
|
It uses the same logic that "which" uses to find executables.
|
|
|
|
|
|
If you wish to get the exit status of the child you must call the
|
|
|
close() method. The exit or signal status of the child will be stored
|
|
|
in self.exitstatus or self.signalstatus. If the child exited normally
|
|
|
then exitstatus will store the exit return code and signalstatus will
|
|
|
be None. If the child was terminated abnormally with a signal then
|
|
|
signalstatus will store the signal value and exitstatus will be None.
|
|
|
If you need more detail you can also read the self.status member which
|
|
|
stores the status returned by os.waitpid. You can interpret this using
|
|
|
os.WIFEXITED/os.WEXITSTATUS or os.WIFSIGNALED/os.TERMSIG. '''
|
|
|
|
|
|
self.STDIN_FILENO = pty.STDIN_FILENO
|
|
|
self.STDOUT_FILENO = pty.STDOUT_FILENO
|
|
|
self.STDERR_FILENO = pty.STDERR_FILENO
|
|
|
self.stdin = sys.stdin
|
|
|
self.stdout = sys.stdout
|
|
|
self.stderr = sys.stderr
|
|
|
|
|
|
self.searcher = None
|
|
|
self.ignorecase = False
|
|
|
self.before = None
|
|
|
self.after = None
|
|
|
self.match = None
|
|
|
self.match_index = None
|
|
|
self.terminated = True
|
|
|
self.exitstatus = None
|
|
|
self.signalstatus = None
|
|
|
# status returned by os.waitpid
|
|
|
self.status = None
|
|
|
self.flag_eof = False
|
|
|
self.pid = None
|
|
|
# the chile filedescriptor is initially closed
|
|
|
self.child_fd = -1
|
|
|
self.timeout = timeout
|
|
|
self.delimiter = EOF
|
|
|
self.logfile = logfile
|
|
|
# input from child (read_nonblocking)
|
|
|
self.logfile_read = None
|
|
|
# output to send (send, sendline)
|
|
|
self.logfile_send = None
|
|
|
# max bytes to read at one time into buffer
|
|
|
self.maxread = maxread
|
|
|
# This is the read buffer. See maxread.
|
|
|
self.buffer = self.string_type()
|
|
|
# Data before searchwindowsize point is preserved, but not searched.
|
|
|
self.searchwindowsize = searchwindowsize
|
|
|
# Delay used before sending data to child. Time in seconds.
|
|
|
# Most Linux machines don't like this to be below 0.03 (30 ms).
|
|
|
self.delaybeforesend = 0.05
|
|
|
# Used by close() to give kernel time to update process status.
|
|
|
# Time in seconds.
|
|
|
self.delayafterclose = 0.1
|
|
|
# Used by terminate() to give kernel time to update process status.
|
|
|
# Time in seconds.
|
|
|
self.delayafterterminate = 0.1
|
|
|
self.softspace = False
|
|
|
self.name = '<' + repr(self) + '>'
|
|
|
self.closed = True
|
|
|
self.cwd = cwd
|
|
|
self.env = env
|
|
|
self.ignore_sighup = ignore_sighup
|
|
|
# This flags if we are running on irix
|
|
|
self.__irix_hack = (sys.platform.lower().find('irix') >= 0)
|
|
|
# Solaris uses internal __fork_pty(). All others use pty.fork().
|
|
|
if ((sys.platform.lower().find('solaris') >= 0)
|
|
|
or (sys.platform.lower().find('sunos5') >= 0)):
|
|
|
self.use_native_pty_fork = False
|
|
|
else:
|
|
|
self.use_native_pty_fork = True
|
|
|
|
|
|
# Support subclasses that do not use command or args.
|
|
|
if command is None:
|
|
|
self.command = None
|
|
|
self.args = None
|
|
|
self.name = '<pexpect factory incomplete>'
|
|
|
else:
|
|
|
self._spawn(command, args)
|
|
|
|
|
|
@staticmethod
|
|
|
def _coerce_expect_string(s):
|
|
|
if not isinstance(s, bytes):
|
|
|
return s.encode('ascii')
|
|
|
return s
|
|
|
|
|
|
@staticmethod
|
|
|
def _coerce_send_string(s):
|
|
|
if not isinstance(s, bytes):
|
|
|
return s.encode('utf-8')
|
|
|
return s
|
|
|
|
|
|
@staticmethod
|
|
|
def _coerce_read_string(s):
|
|
|
return s
|
|
|
|
|
|
def __del__(self):
|
|
|
'''This makes sure that no system resources are left open. Python only
|
|
|
garbage collects Python objects. OS file descriptors are not Python
|
|
|
objects, so they must be handled explicitly. If the child file
|
|
|
descriptor was opened outside of this class (passed to the constructor)
|
|
|
then this does not close it. '''
|
|
|
|
|
|
if not self.closed:
|
|
|
# It is possible for __del__ methods to execute during the
|
|
|
# teardown of the Python VM itself. Thus self.close() may
|
|
|
# trigger an exception because os.close may be None.
|
|
|
try:
|
|
|
self.close()
|
|
|
# which exception, shouldnt' we catch explicitly .. ?
|
|
|
except:
|
|
|
pass
|
|
|
|
|
|
def __str__(self):
|
|
|
'''This returns a human-readable string that represents the state of
|
|
|
the object. '''
|
|
|
|
|
|
s = []
|
|
|
s.append(repr(self))
|
|
|
s.append('version: ' + __version__)
|
|
|
s.append('command: ' + str(self.command))
|
|
|
s.append('args: %r' % (self.args,))
|
|
|
s.append('searcher: %r' % (self.searcher,))
|
|
|
s.append('buffer (last 100 chars): %r' % (self.buffer)[-100:],)
|
|
|
s.append('before (last 100 chars): %r' % (self.before)[-100:],)
|
|
|
s.append('after: %r' % (self.after,))
|
|
|
s.append('match: %r' % (self.match,))
|
|
|
s.append('match_index: ' + str(self.match_index))
|
|
|
s.append('exitstatus: ' + str(self.exitstatus))
|
|
|
s.append('flag_eof: ' + str(self.flag_eof))
|
|
|
s.append('pid: ' + str(self.pid))
|
|
|
s.append('child_fd: ' + str(self.child_fd))
|
|
|
s.append('closed: ' + str(self.closed))
|
|
|
s.append('timeout: ' + str(self.timeout))
|
|
|
s.append('delimiter: ' + str(self.delimiter))
|
|
|
s.append('logfile: ' + str(self.logfile))
|
|
|
s.append('logfile_read: ' + str(self.logfile_read))
|
|
|
s.append('logfile_send: ' + str(self.logfile_send))
|
|
|
s.append('maxread: ' + str(self.maxread))
|
|
|
s.append('ignorecase: ' + str(self.ignorecase))
|
|
|
s.append('searchwindowsize: ' + str(self.searchwindowsize))
|
|
|
s.append('delaybeforesend: ' + str(self.delaybeforesend))
|
|
|
s.append('delayafterclose: ' + str(self.delayafterclose))
|
|
|
s.append('delayafterterminate: ' + str(self.delayafterterminate))
|
|
|
return '\n'.join(s)
|
|
|
|
|
|
def _spawn(self, command, args=[]):
|
|
|
'''This starts the given command in a child process. This does all the
|
|
|
fork/exec type of stuff for a pty. This is called by __init__. If args
|
|
|
is empty then command will be parsed (split on spaces) and args will be
|
|
|
set to parsed arguments. '''
|
|
|
|
|
|
# The pid and child_fd of this object get set by this method.
|
|
|
# Note that it is difficult for this method to fail.
|
|
|
# You cannot detect if the child process cannot start.
|
|
|
# So the only way you can tell if the child process started
|
|
|
# or not is to try to read from the file descriptor. If you get
|
|
|
# EOF immediately then it means that the child is already dead.
|
|
|
# That may not necessarily be bad because you may have spawned a child
|
|
|
# that performs some task; creates no stdout output; and then dies.
|
|
|
|
|
|
# If command is an int type then it may represent a file descriptor.
|
|
|
if isinstance(command, type(0)):
|
|
|
raise ExceptionPexpect('Command is an int type. ' +
|
|
|
'If this is a file descriptor then maybe you want to ' +
|
|
|
'use fdpexpect.fdspawn which takes an existing ' +
|
|
|
'file descriptor instead of a command string.')
|
|
|
|
|
|
if not isinstance(args, type([])):
|
|
|
raise TypeError('The argument, args, must be a list.')
|
|
|
|
|
|
if args == []:
|
|
|
self.args = split_command_line(command)
|
|
|
self.command = self.args[0]
|
|
|
else:
|
|
|
# Make a shallow copy of the args list.
|
|
|
self.args = args[:]
|
|
|
self.args.insert(0, command)
|
|
|
self.command = command
|
|
|
|
|
|
command_with_path = which(self.command)
|
|
|
if command_with_path is None:
|
|
|
raise ExceptionPexpect('The command was not found or was not ' +
|
|
|
'executable: %s.' % self.command)
|
|
|
self.command = command_with_path
|
|
|
self.args[0] = self.command
|
|
|
|
|
|
self.name = '<' + ' '.join(self.args) + '>'
|
|
|
|
|
|
assert self.pid is None, 'The pid member must be None.'
|
|
|
assert self.command is not None, 'The command member must not be None.'
|
|
|
|
|
|
if self.use_native_pty_fork:
|
|
|
try:
|
|
|
self.pid, self.child_fd = pty.fork()
|
|
|
except OSError:
|
|
|
err = sys.exc_info()[1]
|
|
|
raise ExceptionPexpect('pty.fork() failed: ' + str(err))
|
|
|
else:
|
|
|
# Use internal __fork_pty
|
|
|
self.pid, self.child_fd = self.__fork_pty()
|
|
|
|
|
|
if self.pid == 0:
|
|
|
# Child
|
|
|
try:
|
|
|
# used by setwinsize()
|
|
|
self.child_fd = sys.stdout.fileno()
|
|
|
self.setwinsize(24, 80)
|
|
|
# which exception, shouldnt' we catch explicitly .. ?
|
|
|
except:
|
|
|
# Some platforms do not like setwinsize (Cygwin).
|
|
|
# This will cause problem when running applications that
|
|
|
# are very picky about window size.
|
|
|
# This is a serious limitation, but not a show stopper.
|
|
|
pass
|
|
|
# Do not allow child to inherit open file descriptors from parent.
|
|
|
max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
|
|
|
for i in range(3, max_fd):
|
|
|
try:
|
|
|
os.close(i)
|
|
|
except OSError:
|
|
|
pass
|
|
|
|
|
|
if self.ignore_sighup:
|
|
|
signal.signal(signal.SIGHUP, signal.SIG_IGN)
|
|
|
|
|
|
if self.cwd is not None:
|
|
|
os.chdir(self.cwd)
|
|
|
if self.env is None:
|
|
|
os.execv(self.command, self.args)
|
|
|
else:
|
|
|
os.execvpe(self.command, self.args, self.env)
|
|
|
|
|
|
# Parent
|
|
|
self.terminated = False
|
|
|
self.closed = False
|
|
|
|
|
|
def __fork_pty(self):
|
|
|
'''This implements a substitute for the forkpty system call. This
|
|
|
should be more portable than the pty.fork() function. Specifically,
|
|
|
this should work on Solaris.
|
|
|
|
|
|
Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to
|
|
|
resolve the issue with Python's pty.fork() not supporting Solaris,
|
|
|
particularly ssh. Based on patch to posixmodule.c authored by Noah
|
|
|
Spurrier::
|
|
|
|
|
|
http://mail.python.org/pipermail/python-dev/2003-May/035281.html
|
|
|
|
|
|
'''
|
|
|
|
|
|
parent_fd, child_fd = os.openpty()
|
|
|
if parent_fd < 0 or child_fd < 0:
|
|
|
raise ExceptionPexpect("Could not open with os.openpty().")
|
|
|
|
|
|
pid = os.fork()
|
|
|
if pid < 0:
|
|
|
raise ExceptionPexpect("Failed os.fork().")
|
|
|
elif pid == 0:
|
|
|
# Child.
|
|
|
os.close(parent_fd)
|
|
|
self.__pty_make_controlling_tty(child_fd)
|
|
|
|
|
|
os.dup2(child_fd, 0)
|
|
|
os.dup2(child_fd, 1)
|
|
|
os.dup2(child_fd, 2)
|
|
|
|
|
|
if child_fd > 2:
|
|
|
os.close(child_fd)
|
|
|
else:
|
|
|
# Parent.
|
|
|
os.close(child_fd)
|
|
|
|
|
|
return pid, parent_fd
|
|
|
|
|
|
def __pty_make_controlling_tty(self, tty_fd):
|
|
|
'''This makes the pseudo-terminal the controlling tty. This should be
|
|
|
more portable than the pty.fork() function. Specifically, this should
|
|
|
work on Solaris. '''
|
|
|
|
|
|
child_name = os.ttyname(tty_fd)
|
|
|
|
|
|
# Disconnect from controlling tty. Harmless if not already connected.
|
|
|
try:
|
|
|
fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY)
|
|
|
if fd >= 0:
|
|
|
os.close(fd)
|
|
|
# which exception, shouldnt' we catch explicitly .. ?
|
|
|
except:
|
|
|
# Already disconnected. This happens if running inside cron.
|
|
|
pass
|
|
|
|
|
|
os.setsid()
|
|
|
|
|
|
# Verify we are disconnected from controlling tty
|
|
|
# by attempting to open it again.
|
|
|
try:
|
|
|
fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY)
|
|
|
if fd >= 0:
|
|
|
os.close(fd)
|
|
|
raise ExceptionPexpect('Failed to disconnect from ' +
|
|
|
'controlling tty. It is still possible to open /dev/tty.')
|
|
|
# which exception, shouldnt' we catch explicitly .. ?
|
|
|
except:
|
|
|
# Good! We are disconnected from a controlling tty.
|
|
|
pass
|
|
|
|
|
|
# Verify we can open child pty.
|
|
|
fd = os.open(child_name, os.O_RDWR)
|
|
|
if fd < 0:
|
|
|
raise ExceptionPexpect("Could not open child pty, " + child_name)
|
|
|
else:
|
|
|
os.close(fd)
|
|
|
|
|
|
# Verify we now have a controlling tty.
|
|
|
fd = os.open("/dev/tty", os.O_WRONLY)
|
|
|
if fd < 0:
|
|
|
raise ExceptionPexpect("Could not open controlling tty, /dev/tty")
|
|
|
else:
|
|
|
os.close(fd)
|
|
|
|
|
|
def fileno(self):
|
|
|
'''This returns the file descriptor of the pty for the child.
|
|
|
'''
|
|
|
return self.child_fd
|
|
|
|
|
|
def close(self, force=True):
|
|
|
'''This closes the connection with the child application. Note that
|
|
|
calling close() more than once is valid. This emulates standard Python
|
|
|
behavior with files. Set force to True if you want to make sure that
|
|
|
the child is terminated (SIGKILL is sent if the child ignores SIGHUP
|
|
|
and SIGINT). '''
|
|
|
|
|
|
if not self.closed:
|
|
|
self.flush()
|
|
|
os.close(self.child_fd)
|
|
|
# Give kernel time to update process status.
|
|
|
time.sleep(self.delayafterclose)
|
|
|
if self.isalive():
|
|
|
if not self.terminate(force):
|
|
|
raise ExceptionPexpect('Could not terminate the child.')
|
|
|
self.child_fd = -1
|
|
|
self.closed = True
|
|
|
#self.pid = None
|
|
|
|
|
|
def flush(self):
|
|
|
'''This does nothing. It is here to support the interface for a
|
|
|
File-like object. '''
|
|
|
|
|
|
pass
|
|
|
|
|
|
def isatty(self):
|
|
|
'''This returns True if the file descriptor is open and connected to a
|
|
|
tty(-like) device, else False. '''
|
|
|
|
|
|
return os.isatty(self.child_fd)
|
|
|
|
|
|
def waitnoecho(self, timeout=-1):
|
|
|
'''This waits until the terminal ECHO flag is set False. This returns
|
|
|
True if the echo mode is off. This returns False if the ECHO flag was
|
|
|
not set False before the timeout. This can be used to detect when the
|
|
|
child is waiting for a password. Usually a child application will turn
|
|
|
off echo mode when it is waiting for the user to enter a password. For
|
|
|
example, instead of expecting the "password:" prompt you can wait for
|
|
|
the child to set ECHO off::
|
|
|
|
|
|
p = pexpect.spawn('ssh user@example.com')
|
|
|
p.waitnoecho()
|
|
|
p.sendline(mypassword)
|
|
|
|
|
|
If timeout==-1 then this method will use the value in self.timeout.
|
|
|
If timeout==None then this method to block until ECHO flag is False.
|
|
|
'''
|
|
|
|
|
|
if timeout == -1:
|
|
|
timeout = self.timeout
|
|
|
if timeout is not None:
|
|
|
end_time = time.time() + timeout
|
|
|
while True:
|
|
|
if not self.getecho():
|
|
|
return True
|
|
|
if timeout < 0 and timeout is not None:
|
|
|
return False
|
|
|
if timeout is not None:
|
|
|
timeout = end_time - time.time()
|
|
|
time.sleep(0.1)
|
|
|
|
|
|
def getecho(self):
|
|
|
'''This returns the terminal echo mode. This returns True if echo is
|
|
|
on or False if echo is off. Child applications that are expecting you
|
|
|
to enter a password often set ECHO False. See waitnoecho(). '''
|
|
|
|
|
|
attr = termios.tcgetattr(self.child_fd)
|
|
|
if attr[3] & termios.ECHO:
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
def setecho(self, state):
|
|
|
'''This sets the terminal echo mode on or off. Note that anything the
|
|
|
child sent before the echo will be lost, so you should be sure that
|
|
|
your input buffer is empty before you call setecho(). For example, the
|
|
|
following will work as expected::
|
|
|
|
|
|
p = pexpect.spawn('cat') # Echo is on by default.
|
|
|
p.sendline('1234') # We expect see this twice from the child...
|
|
|
p.expect(['1234']) # ... once from the tty echo...
|
|
|
p.expect(['1234']) # ... and again from cat itself.
|
|
|
p.setecho(False) # Turn off tty echo
|
|
|
p.sendline('abcd') # We will set this only once (echoed by cat).
|
|
|
p.sendline('wxyz') # We will set this only once (echoed by cat)
|
|
|
p.expect(['abcd'])
|
|
|
p.expect(['wxyz'])
|
|
|
|
|
|
The following WILL NOT WORK because the lines sent before the setecho
|
|
|
will be lost::
|
|
|
|
|
|
p = pexpect.spawn('cat')
|
|
|
p.sendline('1234')
|
|
|
p.setecho(False) # Turn off tty echo
|
|
|
p.sendline('abcd') # We will set this only once (echoed by cat).
|
|
|
p.sendline('wxyz') # We will set this only once (echoed by cat)
|
|
|
p.expect(['1234'])
|
|
|
p.expect(['1234'])
|
|
|
p.expect(['abcd'])
|
|
|
p.expect(['wxyz'])
|
|
|
'''
|
|
|
|
|
|
self.child_fd
|
|
|
attr = termios.tcgetattr(self.child_fd)
|
|
|
if state:
|
|
|
attr[3] = attr[3] | termios.ECHO
|
|
|
else:
|
|
|
attr[3] = attr[3] & ~termios.ECHO
|
|
|
# I tried TCSADRAIN and TCSAFLUSH, but
|
|
|
# these were inconsistent and blocked on some platforms.
|
|
|
# TCSADRAIN would probably be ideal if it worked.
|
|
|
termios.tcsetattr(self.child_fd, termios.TCSANOW, attr)
|
|
|
|
|
|
def _log(self, s, direction):
|
|
|
if self.logfile is not None:
|
|
|
self.logfile.write(s)
|
|
|
self.logfile.flush()
|
|
|
second_log = self.logfile_send if (direction=='send') else self.logfile_read
|
|
|
if second_log is not None:
|
|
|
second_log.write(s)
|
|
|
second_log.flush()
|
|
|
|
|
|
def read_nonblocking(self, size=1, timeout=-1):
|
|
|
'''This reads at most size characters from the child application. It
|
|
|
includes a timeout. If the read does not complete within the timeout
|
|
|
period then a TIMEOUT exception is raised. If the end of file is read
|
|
|
then an EOF exception will be raised. If a log file was set using
|
|
|
setlog() then all data will also be written to the log file.
|
|
|
|
|
|
If timeout is None then the read may block indefinitely.
|
|
|
If timeout is -1 then the self.timeout value is used. If timeout is 0
|
|
|
then the child is polled and if there is no data immediately ready
|
|
|
then this will raise a TIMEOUT exception.
|
|
|
|
|
|
The timeout refers only to the amount of time to read at least one
|
|
|
character. This is not effected by the 'size' parameter, so if you call
|
|
|
read_nonblocking(size=100, timeout=30) and only one character is
|
|
|
available right away then one character will be returned immediately.
|
|
|
It will not wait for 30 seconds for another 99 characters to come in.
|
|
|
|
|
|
This is a wrapper around os.read(). It uses select.select() to
|
|
|
implement the timeout. '''
|
|
|
|
|
|
if self.closed:
|
|
|
raise ValueError('I/O operation on closed file.')
|
|
|
|
|
|
if timeout == -1:
|
|
|
timeout = self.timeout
|
|
|
|
|
|
# Note that some systems such as Solaris do not give an EOF when
|
|
|
# the child dies. In fact, you can still try to read
|
|
|
# from the child_fd -- it will block forever or until TIMEOUT.
|
|
|
# For this case, I test isalive() before doing any reading.
|
|
|
# If isalive() is false, then I pretend that this is the same as EOF.
|
|
|
if not self.isalive():
|
|
|
# timeout of 0 means "poll"
|
|
|
r, w, e = self.__select([self.child_fd], [], [], 0)
|
|
|
if not r:
|
|
|
self.flag_eof = True
|
|
|
raise EOF('End Of File (EOF). Braindead platform.')
|
|
|
elif self.__irix_hack:
|
|
|
# Irix takes a long time before it realizes a child was terminated.
|
|
|
# FIXME So does this mean Irix systems are forced to always have
|
|
|
# FIXME a 2 second delay when calling read_nonblocking? That sucks.
|
|
|
r, w, e = self.__select([self.child_fd], [], [], 2)
|
|
|
if not r and not self.isalive():
|
|
|
self.flag_eof = True
|
|
|
raise EOF('End Of File (EOF). Slow platform.')
|
|
|
|
|
|
r, w, e = self.__select([self.child_fd], [], [], timeout)
|
|
|
|
|
|
if not r:
|
|
|
if not self.isalive():
|
|
|
# Some platforms, such as Irix, will claim that their
|
|
|
# processes are alive; timeout on the select; and
|
|
|
# then finally admit that they are not alive.
|
|
|
self.flag_eof = True
|
|
|
raise EOF('End of File (EOF). Very slow platform.')
|
|
|
else:
|
|
|
raise TIMEOUT('Timeout exceeded.')
|
|
|
|
|
|
if self.child_fd in r:
|
|
|
try:
|
|
|
s = os.read(self.child_fd, size)
|
|
|
except OSError:
|
|
|
# Linux does this
|
|
|
self.flag_eof = True
|
|
|
raise EOF('End Of File (EOF). Exception style platform.')
|
|
|
if s == b'':
|
|
|
# BSD style
|
|
|
self.flag_eof = True
|
|
|
raise EOF('End Of File (EOF). Empty string style platform.')
|
|
|
|
|
|
s = self._coerce_read_string(s)
|
|
|
self._log(s, 'read')
|
|
|
return s
|
|
|
|
|
|
raise ExceptionPexpect('Reached an unexpected state.')
|
|
|
|
|
|
def read(self, size=-1):
|
|
|
'''This reads at most "size" bytes from the file (less if the read hits
|
|
|
EOF before obtaining size bytes). If the size argument is negative or
|
|
|
omitted, read all data until EOF is reached. The bytes are returned as
|
|
|
a string object. An empty string is returned when EOF is encountered
|
|
|
immediately. '''
|
|
|
|
|
|
if size == 0:
|
|
|
return self.string_type()
|
|
|
if size < 0:
|
|
|
# delimiter default is EOF
|
|
|
self.expect(self.delimiter)
|
|
|
return self.before
|
|
|
|
|
|
# I could have done this more directly by not using expect(), but
|
|
|
# I deliberately decided to couple read() to expect() so that
|
|
|
# I would catch any bugs early and ensure consistant behavior.
|
|
|
# It's a little less efficient, but there is less for me to
|
|
|
# worry about if I have to later modify read() or expect().
|
|
|
# Note, it's OK if size==-1 in the regex. That just means it
|
|
|
# will never match anything in which case we stop only on EOF.
|
|
|
cre = re.compile(self._coerce_expect_string('.{%d}' % size), re.DOTALL)
|
|
|
# delimiter default is EOF
|
|
|
index = self.expect([cre, self.delimiter])
|
|
|
if index == 0:
|
|
|
### FIXME self.before should be ''. Should I assert this?
|
|
|
return self.after
|
|
|
return self.before
|
|
|
|
|
|
def readline(self, size=-1):
|
|
|
'''This reads and returns one entire line. The newline at the end of
|
|
|
line is returned as part of the string, unless the file ends without a
|
|
|
newline. An empty string is returned if EOF is encountered immediately.
|
|
|
This looks for a newline as a CR/LF pair (\\r\\n) even on UNIX because
|
|
|
this is what the pseudotty device returns. So contrary to what you may
|
|
|
expect you will receive newlines as \\r\\n.
|
|
|
|
|
|
If the size argument is 0 then an empty string is returned. In all
|
|
|
other cases the size argument is ignored, which is not standard
|
|
|
behavior for a file-like object. '''
|
|
|
|
|
|
if size == 0:
|
|
|
return self.string_type()
|
|
|
# delimiter default is EOF
|
|
|
index = self.expect([b'\r\n', self.delimiter])
|
|
|
if index == 0:
|
|
|
return self.before + b'\r\n'
|
|
|
else:
|
|
|
return self.before
|
|
|
|
|
|
def __iter__(self):
|
|
|
'''This is to support iterators over a file-like object.
|
|
|
'''
|
|
|
return iter(self.readline, self.string_type())
|
|
|
|
|
|
def readlines(self, sizehint=-1):
|
|
|
'''This reads until EOF using readline() and returns a list containing
|
|
|
the lines thus read. The optional 'sizehint' argument is ignored.
|
|
|
Remember, because this reads until EOF that means the child
|
|
|
process should have closed its stdout. If you run this method on
|
|
|
a child that is still running with its stdout open then this
|
|
|
method will block until it timesout.'''
|
|
|
|
|
|
lines = []
|
|
|
while True:
|
|
|
line = self.readline()
|
|
|
if not line:
|
|
|
break
|
|
|
lines.append(line)
|
|
|
return lines
|
|
|
|
|
|
def write(self, s):
|
|
|
'''This is similar to send() except that there is no return value.
|
|
|
'''
|
|
|
|
|
|
self.send(s)
|
|
|
|
|
|
def writelines(self, sequence):
|
|
|
'''This calls write() for each element in the sequence. The sequence
|
|
|
can be any iterable object producing strings, typically a list of
|
|
|
strings. This does not add line separators. There is no return value.
|
|
|
'''
|
|
|
|
|
|
for s in sequence:
|
|
|
self.write(s)
|
|
|
|
|
|
def send(self, s):
|
|
|
'''Sends string ``s`` to the child process, returning the number of
|
|
|
bytes written. If a logfile is specified, a copy is written to that
|
|
|
log. '''
|
|
|
|
|
|
time.sleep(self.delaybeforesend)
|
|
|
|
|
|
s = self._coerce_send_string(s)
|
|
|
self._log(s, 'send')
|
|
|
|
|
|
return self._send(s)
|
|
|
|
|
|
def _send(self, s):
|
|
|
return os.write(self.child_fd, s)
|
|
|
|
|
|
def sendline(self, s=''):
|
|
|
'''Wraps send(), sending string ``s`` to child process, with os.linesep
|
|
|
automatically appended. Returns number of bytes written. '''
|
|
|
|
|
|
n = self.send(s)
|
|
|
n = n + self.send(self.linesep)
|
|
|
return n
|
|
|
|
|
|
def sendcontrol(self, char):
|
|
|
|
|
|
'''Helper method that wraps send() with mnemonic access for sending control
|
|
|
character to the child (such as Ctrl-C or Ctrl-D). For example, to send
|
|
|
Ctrl-G (ASCII 7, bell, '\a')::
|
|
|
|
|
|
child.sendcontrol('g')
|
|
|
|
|
|
See also, sendintr() and sendeof().
|
|
|
'''
|
|
|
|
|
|
char = char.lower()
|
|
|
a = ord(char)
|
|
|
if a >= 97 and a <= 122:
|
|
|
a = a - ord('a') + 1
|
|
|
return self.send(self._chr(a))
|
|
|
d = {'@': 0, '`': 0,
|
|
|
'[': 27, '{': 27,
|
|
|
'\\': 28, '|': 28,
|
|
|
']': 29, '}': 29,
|
|
|
'^': 30, '~': 30,
|
|
|
'_': 31,
|
|
|
'?': 127}
|
|
|
if char not in d:
|
|
|
return 0
|
|
|
return self.send(self._chr(d[char]))
|
|
|
|
|
|
def sendeof(self):
|
|
|
|
|
|
'''This sends an EOF to the child. This sends a character which causes
|
|
|
the pending parent output buffer to be sent to the waiting child
|
|
|
program without waiting for end-of-line. If it is the first character
|
|
|
of the line, the read() in the user program returns 0, which signifies
|
|
|
end-of-file. This means to work as expected a sendeof() has to be
|
|
|
called at the beginning of a line. This method does not send a newline.
|
|
|
It is the responsibility of the caller to ensure the eof is sent at the
|
|
|
beginning of a line. '''
|
|
|
|
|
|
### Hmmm... how do I send an EOF?
|
|
|
###C if ((m = write(pty, *buf, p - *buf)) < 0)
|
|
|
###C return (errno == EWOULDBLOCK) ? n : -1;
|
|
|
#fd = sys.stdin.fileno()
|
|
|
#old = termios.tcgetattr(fd) # remember current state
|
|
|
#attr = termios.tcgetattr(fd)
|
|
|
#attr[3] = attr[3] | termios.ICANON # ICANON must be set to see EOF
|
|
|
#try: # use try/finally to ensure state gets restored
|
|
|
# termios.tcsetattr(fd, termios.TCSADRAIN, attr)
|
|
|
# if hasattr(termios, 'CEOF'):
|
|
|
# os.write(self.child_fd, '%c' % termios.CEOF)
|
|
|
# else:
|
|
|
# # Silly platform does not define CEOF so assume CTRL-D
|
|
|
# os.write(self.child_fd, '%c' % 4)
|
|
|
#finally: # restore state
|
|
|
# termios.tcsetattr(fd, termios.TCSADRAIN, old)
|
|
|
if hasattr(termios, 'VEOF'):
|
|
|
char = ord(termios.tcgetattr(self.child_fd)[6][termios.VEOF])
|
|
|
else:
|
|
|
# platform does not define VEOF so assume CTRL-D
|
|
|
char = 4
|
|
|
self.send(self._chr(char))
|
|
|
|
|
|
def sendintr(self):
|
|
|
|
|
|
'''This sends a SIGINT to the child. It does not require
|
|
|
the SIGINT to be the first character on a line. '''
|
|
|
|
|
|
if hasattr(termios, 'VINTR'):
|
|
|
char = ord(termios.tcgetattr(self.child_fd)[6][termios.VINTR])
|
|
|
else:
|
|
|
# platform does not define VINTR so assume CTRL-C
|
|
|
char = 3
|
|
|
self.send(self._chr(char))
|
|
|
|
|
|
def eof(self):
|
|
|
|
|
|
'''This returns True if the EOF exception was ever raised.
|
|
|
'''
|
|
|
|
|
|
return self.flag_eof
|
|
|
|
|
|
def terminate(self, force=False):
|
|
|
|
|
|
'''This forces a child process to terminate. It starts nicely with
|
|
|
SIGHUP and SIGINT. If "force" is True then moves onto SIGKILL. This
|
|
|
returns True if the child was terminated. This returns False if the
|
|
|
child could not be terminated. '''
|
|
|
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
try:
|
|
|
self.kill(signal.SIGHUP)
|
|
|
time.sleep(self.delayafterterminate)
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
self.kill(signal.SIGCONT)
|
|
|
time.sleep(self.delayafterterminate)
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
self.kill(signal.SIGINT)
|
|
|
time.sleep(self.delayafterterminate)
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
if force:
|
|
|
self.kill(signal.SIGKILL)
|
|
|
time.sleep(self.delayafterterminate)
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
return False
|
|
|
except OSError:
|
|
|
# I think there are kernel timing issues that sometimes cause
|
|
|
# this to happen. I think isalive() reports True, but the
|
|
|
# process is dead to the kernel.
|
|
|
# Make one last attempt to see if the kernel is up to date.
|
|
|
time.sleep(self.delayafterterminate)
|
|
|
if not self.isalive():
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
|
|
|
def wait(self):
|
|
|
|
|
|
'''This waits until the child exits. This is a blocking call. This will
|
|
|
not read any data from the child, so this will block forever if the
|
|
|
child has unread output and has terminated. In other words, the child
|
|
|
may have printed output then called exit(), but, the child is
|
|
|
technically still alive until its output is read by the parent. '''
|
|
|
|
|
|
if self.isalive():
|
|
|
pid, status = os.waitpid(self.pid, 0)
|
|
|
else:
|
|
|
raise ExceptionPexpect('Cannot wait for dead child process.')
|
|
|
self.exitstatus = os.WEXITSTATUS(status)
|
|
|
if os.WIFEXITED(status):
|
|
|
self.status = status
|
|
|
self.exitstatus = os.WEXITSTATUS(status)
|
|
|
self.signalstatus = None
|
|
|
self.terminated = True
|
|
|
elif os.WIFSIGNALED(status):
|
|
|
self.status = status
|
|
|
self.exitstatus = None
|
|
|
self.signalstatus = os.WTERMSIG(status)
|
|
|
self.terminated = True
|
|
|
elif os.WIFSTOPPED(status):
|
|
|
# You can't call wait() on a child process in the stopped state.
|
|
|
raise ExceptionPexpect('Called wait() on a stopped child ' +
|
|
|
'process. This is not supported. Is some other ' +
|
|
|
'process attempting job control with our child pid?')
|
|
|
return self.exitstatus
|
|
|
|
|
|
def isalive(self):
|
|
|
|
|
|
'''This tests if the child process is running or not. This is
|
|
|
non-blocking. If the child was terminated then this will read the
|
|
|
exitstatus or signalstatus of the child. This returns True if the child
|
|
|
process appears to be running or False if not. It can take literally
|
|
|
SECONDS for Solaris to return the right status. '''
|
|
|
|
|
|
if self.terminated:
|
|
|
return False
|
|
|
|
|
|
if self.flag_eof:
|
|
|
# This is for Linux, which requires the blocking form
|
|
|
# of waitpid to # get status of a defunct process.
|
|
|
# This is super-lame. The flag_eof would have been set
|
|
|
# in read_nonblocking(), so this should be safe.
|
|
|
waitpid_options = 0
|
|
|
else:
|
|
|
waitpid_options = os.WNOHANG
|
|
|
|
|
|
try:
|
|
|
pid, status = os.waitpid(self.pid, waitpid_options)
|
|
|
except OSError:
|
|
|
err = sys.exc_info()[1]
|
|
|
# No child processes
|
|
|
if err.errno == errno.ECHILD:
|
|
|
raise ExceptionPexpect('isalive() encountered condition ' +
|
|
|
'where "terminated" is 0, but there was no child ' +
|
|
|
'process. Did someone else call waitpid() ' +
|
|
|
'on our process?')
|
|
|
else:
|
|
|
raise err
|
|
|
|
|
|
# I have to do this twice for Solaris.
|
|
|
# I can't even believe that I figured this out...
|
|
|
# If waitpid() returns 0 it means that no child process
|
|
|
# wishes to report, and the value of status is undefined.
|
|
|
if pid == 0:
|
|
|
try:
|
|
|
### os.WNOHANG) # Solaris!
|
|
|
pid, status = os.waitpid(self.pid, waitpid_options)
|
|
|
except OSError as e:
|
|
|
# This should never happen...
|
|
|
if e.errno == errno.ECHILD:
|
|
|
raise ExceptionPexpect('isalive() encountered condition ' +
|
|
|
'that should never happen. There was no child ' +
|
|
|
'process. Did someone else call waitpid() ' +
|
|
|
'on our process?')
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
# If pid is still 0 after two calls to waitpid() then the process
|
|
|
# really is alive. This seems to work on all platforms, except for
|
|
|
# Irix which seems to require a blocking call on waitpid or select,
|
|
|
# so I let read_nonblocking take care of this situation
|
|
|
# (unfortunately, this requires waiting through the timeout).
|
|
|
if pid == 0:
|
|
|
return True
|
|
|
|
|
|
if pid == 0:
|
|
|
return True
|
|
|
|
|
|
if os.WIFEXITED(status):
|
|
|
self.status = status
|
|
|
self.exitstatus = os.WEXITSTATUS(status)
|
|
|
self.signalstatus = None
|
|
|
self.terminated = True
|
|
|
elif os.WIFSIGNALED(status):
|
|
|
self.status = status
|
|
|
self.exitstatus = None
|
|
|
self.signalstatus = os.WTERMSIG(status)
|
|
|
self.terminated = True
|
|
|
elif os.WIFSTOPPED(status):
|
|
|
raise ExceptionPexpect('isalive() encountered condition ' +
|
|
|
'where child process is stopped. This is not ' +
|
|
|
'supported. Is some other process attempting ' +
|
|
|
'job control with our child pid?')
|
|
|
return False
|
|
|
|
|
|
def kill(self, sig):
|
|
|
|
|
|
'''This sends the given signal to the child application. In keeping
|
|
|
with UNIX tradition it has a misleading name. It does not necessarily
|
|
|
kill the child unless you send the right signal. '''
|
|
|
|
|
|
# Same as os.kill, but the pid is given for you.
|
|
|
if self.isalive():
|
|
|
os.kill(self.pid, sig)
|
|
|
|
|
|
def _pattern_type_err(self, pattern):
|
|
|
raise TypeError('got {badtype} ({badobj!r}) as pattern, must be one'
|
|
|
' of: {goodtypes}, pexpect.EOF, pexpect.TIMEOUT'\
|
|
|
.format(badtype=type(pattern),
|
|
|
badobj=pattern,
|
|
|
goodtypes=', '.join([str(ast)\
|
|
|
for ast in self.allowed_string_types])
|
|
|
)
|
|
|
)
|
|
|
|
|
|
def compile_pattern_list(self, patterns):
|
|
|
|
|
|
'''This compiles a pattern-string or a list of pattern-strings.
|
|
|
Patterns must be a StringType, EOF, TIMEOUT, SRE_Pattern, or a list of
|
|
|
those. Patterns may also be None which results in an empty list (you
|
|
|
might do this if waiting for an EOF or TIMEOUT condition without
|
|
|
expecting any pattern).
|
|
|
|
|
|
This is used by expect() when calling expect_list(). Thus expect() is
|
|
|
nothing more than::
|
|
|
|
|
|
cpl = self.compile_pattern_list(pl)
|
|
|
return self.expect_list(cpl, timeout)
|
|
|
|
|
|
If you are using expect() within a loop it may be more
|
|
|
efficient to compile the patterns first and then call expect_list().
|
|
|
This avoid calls in a loop to compile_pattern_list()::
|
|
|
|
|
|
cpl = self.compile_pattern_list(my_pattern)
|
|
|
while some_condition:
|
|
|
...
|
|
|
i = self.expect_list(clp, timeout)
|
|
|
...
|
|
|
'''
|
|
|
|
|
|
if patterns is None:
|
|
|
return []
|
|
|
if not isinstance(patterns, list):
|
|
|
patterns = [patterns]
|
|
|
|
|
|
# Allow dot to match \n
|
|
|
compile_flags = re.DOTALL
|
|
|
if self.ignorecase:
|
|
|
compile_flags = compile_flags | re.IGNORECASE
|
|
|
compiled_pattern_list = []
|
|
|
for idx, p in enumerate(patterns):
|
|
|
if isinstance(p, self.allowed_string_types):
|
|
|
p = self._coerce_expect_string(p)
|
|
|
compiled_pattern_list.append(re.compile(p, compile_flags))
|
|
|
elif p is EOF:
|
|
|
compiled_pattern_list.append(EOF)
|
|
|
elif p is TIMEOUT:
|
|
|
compiled_pattern_list.append(TIMEOUT)
|
|
|
elif isinstance(p, type(re.compile(''))):
|
|
|
compiled_pattern_list.append(p)
|
|
|
else:
|
|
|
self._pattern_type_err(p)
|
|
|
return compiled_pattern_list
|
|
|
|
|
|
def expect(self, pattern, timeout=-1, searchwindowsize=-1):
|
|
|
|
|
|
'''This seeks through the stream until a pattern is matched. The
|
|
|
pattern is overloaded and may take several types. The pattern can be a
|
|
|
StringType, EOF, a compiled re, or a list of any of those types.
|
|
|
Strings will be compiled to re types. This returns the index into the
|
|
|
pattern list. If the pattern was not a list this returns index 0 on a
|
|
|
successful match. This may raise exceptions for EOF or TIMEOUT. To
|
|
|
avoid the EOF or TIMEOUT exceptions add EOF or TIMEOUT to the pattern
|
|
|
list. That will cause expect to match an EOF or TIMEOUT condition
|
|
|
instead of raising an exception.
|
|
|
|
|
|
If you pass a list of patterns and more than one matches, the first
|
|
|
match in the stream is chosen. If more than one pattern matches at that
|
|
|
point, the leftmost in the pattern list is chosen. For example::
|
|
|
|
|
|
# the input is 'foobar'
|
|
|
index = p.expect(['bar', 'foo', 'foobar'])
|
|
|
# returns 1('foo') even though 'foobar' is a "better" match
|
|
|
|
|
|
Please note, however, that buffering can affect this behavior, since
|
|
|
input arrives in unpredictable chunks. For example::
|
|
|
|
|
|
# the input is 'foobar'
|
|
|
index = p.expect(['foobar', 'foo'])
|
|
|
# returns 0('foobar') if all input is available at once,
|
|
|
# but returs 1('foo') if parts of the final 'bar' arrive late
|
|
|
|
|
|
After a match is found the instance attributes 'before', 'after' and
|
|
|
'match' will be set. You can see all the data read before the match in
|
|
|
'before'. You can see the data that was matched in 'after'. The
|
|
|
re.MatchObject used in the re match will be in 'match'. If an error
|
|
|
occurred then 'before' will be set to all the data read so far and
|
|
|
'after' and 'match' will be None.
|
|
|
|
|
|
If timeout is -1 then timeout will be set to the self.timeout value.
|
|
|
|
|
|
A list entry may be EOF or TIMEOUT instead of a string. This will
|
|
|
catch these exceptions and return the index of the list entry instead
|
|
|
of raising the exception. The attribute 'after' will be set to the
|
|
|
exception type. The attribute 'match' will be None. This allows you to
|
|
|
write code like this::
|
|
|
|
|
|
index = p.expect(['good', 'bad', pexpect.EOF, pexpect.TIMEOUT])
|
|
|
if index == 0:
|
|
|
do_something()
|
|
|
elif index == 1:
|
|
|
do_something_else()
|
|
|
elif index == 2:
|
|
|
do_some_other_thing()
|
|
|
elif index == 3:
|
|
|
do_something_completely_different()
|
|
|
|
|
|
instead of code like this::
|
|
|
|
|
|
try:
|
|
|
index = p.expect(['good', 'bad'])
|
|
|
if index == 0:
|
|
|
do_something()
|
|
|
elif index == 1:
|
|
|
do_something_else()
|
|
|
except EOF:
|
|
|
do_some_other_thing()
|
|
|
except TIMEOUT:
|
|
|
do_something_completely_different()
|
|
|
|
|
|
These two forms are equivalent. It all depends on what you want. You
|
|
|
can also just expect the EOF if you are waiting for all output of a
|
|
|
child to finish. For example::
|
|
|
|
|
|
p = pexpect.spawn('/bin/ls')
|
|
|
p.expect(pexpect.EOF)
|
|
|
print p.before
|
|
|
|
|
|
If you are trying to optimize for speed then see expect_list().
|
|
|
'''
|
|
|
|
|
|
compiled_pattern_list = self.compile_pattern_list(pattern)
|
|
|
return self.expect_list(compiled_pattern_list,
|
|
|
timeout, searchwindowsize)
|
|
|
|
|
|
def expect_list(self, pattern_list, timeout=-1, searchwindowsize=-1):
|
|
|
|
|
|
'''This takes a list of compiled regular expressions and returns the
|
|
|
index into the pattern_list that matched the child output. The list may
|
|
|
also contain EOF or TIMEOUT(which are not compiled regular
|
|
|
expressions). This method is similar to the expect() method except that
|
|
|
expect_list() does not recompile the pattern list on every call. This
|
|
|
may help if you are trying to optimize for speed, otherwise just use
|
|
|
the expect() method. This is called by expect(). If timeout==-1 then
|
|
|
the self.timeout value is used. If searchwindowsize==-1 then the
|
|
|
self.searchwindowsize value is used. '''
|
|
|
|
|
|
return self.expect_loop(searcher_re(pattern_list),
|
|
|
timeout, searchwindowsize)
|
|
|
|
|
|
def expect_exact(self, pattern_list, timeout=-1, searchwindowsize=-1):
|
|
|
|
|
|
'''This is similar to expect(), but uses plain string matching instead
|
|
|
of compiled regular expressions in 'pattern_list'. The 'pattern_list'
|
|
|
may be a string; a list or other sequence of strings; or TIMEOUT and
|
|
|
EOF.
|
|
|
|
|
|
This call might be faster than expect() for two reasons: string
|
|
|
searching is faster than RE matching and it is possible to limit the
|
|
|
search to just the end of the input buffer.
|
|
|
|
|
|
This method is also useful when you don't want to have to worry about
|
|
|
escaping regular expression characters that you want to match.'''
|
|
|
|
|
|
if (isinstance(pattern_list, self.allowed_string_types) or
|
|
|
pattern_list in (TIMEOUT, EOF)):
|
|
|
pattern_list = [pattern_list]
|
|
|
|
|
|
def prepare_pattern(pattern):
|
|
|
if pattern in (TIMEOUT, EOF):
|
|
|
return pattern
|
|
|
if isinstance(pattern, self.allowed_string_types):
|
|
|
return self._coerce_expect_string(pattern)
|
|
|
self._pattern_type_err(pattern)
|
|
|
|
|
|
try:
|
|
|
pattern_list = iter(pattern_list)
|
|
|
except TypeError:
|
|
|
self._pattern_type_err(pattern_list)
|
|
|
pattern_list = [prepare_pattern(p) for p in pattern_list]
|
|
|
return self.expect_loop(searcher_string(pattern_list),
|
|
|
timeout, searchwindowsize)
|
|
|
|
|
|
def expect_loop(self, searcher, timeout=-1, searchwindowsize=-1):
|
|
|
|
|
|
'''This is the common loop used inside expect. The 'searcher' should be
|
|
|
an instance of searcher_re or searcher_string, which describes how and
|
|
|
what to search for in the input.
|
|
|
|
|
|
See expect() for other arguments, return value and exceptions. '''
|
|
|
|
|
|
self.searcher = searcher
|
|
|
|
|
|
if timeout == -1:
|
|
|
timeout = self.timeout
|
|
|
if timeout is not None:
|
|
|
end_time = time.time() + timeout
|
|
|
if searchwindowsize == -1:
|
|
|
searchwindowsize = self.searchwindowsize
|
|
|
|
|
|
try:
|
|
|
incoming = self.buffer
|
|
|
freshlen = len(incoming)
|
|
|
while True:
|
|
|
# Keep reading until exception or return.
|
|
|
index = searcher.search(incoming, freshlen, searchwindowsize)
|
|
|
if index >= 0:
|
|
|
self.buffer = incoming[searcher.end:]
|
|
|
self.before = incoming[: searcher.start]
|
|
|
self.after = incoming[searcher.start: searcher.end]
|
|
|
self.match = searcher.match
|
|
|
self.match_index = index
|
|
|
return self.match_index
|
|
|
# No match at this point
|
|
|
if (timeout is not None) and (timeout < 0):
|
|
|
raise TIMEOUT('Timeout exceeded in expect_any().')
|
|
|
# Still have time left, so read more data
|
|
|
c = self.read_nonblocking(self.maxread, timeout)
|
|
|
freshlen = len(c)
|
|
|
time.sleep(0.0001)
|
|
|
incoming = incoming + c
|
|
|
if timeout is not None:
|
|
|
timeout = end_time - time.time()
|
|
|
except EOF:
|
|
|
err = sys.exc_info()[1]
|
|
|
self.buffer = self.string_type()
|
|
|
self.before = incoming
|
|
|
self.after = EOF
|
|
|
index = searcher.eof_index
|
|
|
if index >= 0:
|
|
|
self.match = EOF
|
|
|
self.match_index = index
|
|
|
return self.match_index
|
|
|
else:
|
|
|
self.match = None
|
|
|
self.match_index = None
|
|
|
raise EOF(str(err) + '\n' + str(self))
|
|
|
except TIMEOUT:
|
|
|
err = sys.exc_info()[1]
|
|
|
self.buffer = incoming
|
|
|
self.before = incoming
|
|
|
self.after = TIMEOUT
|
|
|
index = searcher.timeout_index
|
|
|
if index >= 0:
|
|
|
self.match = TIMEOUT
|
|
|
self.match_index = index
|
|
|
return self.match_index
|
|
|
else:
|
|
|
self.match = None
|
|
|
self.match_index = None
|
|
|
raise TIMEOUT(str(err) + '\n' + str(self))
|
|
|
except:
|
|
|
self.before = incoming
|
|
|
self.after = None
|
|
|
self.match = None
|
|
|
self.match_index = None
|
|
|
raise
|
|
|
|
|
|
def getwinsize(self):
|
|
|
|
|
|
'''This returns the terminal window size of the child tty. The return
|
|
|
value is a tuple of (rows, cols). '''
|
|
|
|
|
|
TIOCGWINSZ = getattr(termios, 'TIOCGWINSZ', 1074295912)
|
|
|
s = struct.pack('HHHH', 0, 0, 0, 0)
|
|
|
x = fcntl.ioctl(self.child_fd, TIOCGWINSZ, s)
|
|
|
return struct.unpack('HHHH', x)[0:2]
|
|
|
|
|
|
def setwinsize(self, rows, cols):
|
|
|
|
|
|
'''This sets the terminal window size of the child tty. This will cause
|
|
|
a SIGWINCH signal to be sent to the child. This does not change the
|
|
|
physical window size. It changes the size reported to TTY-aware
|
|
|
applications like vi or curses -- applications that respond to the
|
|
|
SIGWINCH signal. '''
|
|
|
|
|
|
# Some very old platforms have a bug that causes the value for
|
|
|
# termios.TIOCSWINSZ to be truncated. There was a hack here to work
|
|
|
# around this, but it caused problems with newer platforms so has been
|
|
|
# removed. For details see https://github.com/pexpect/pexpect/issues/39
|
|
|
TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
|
|
|
# Note, assume ws_xpixel and ws_ypixel are zero.
|
|
|
s = struct.pack('HHHH', rows, cols, 0, 0)
|
|
|
fcntl.ioctl(self.fileno(), TIOCSWINSZ, s)
|
|
|
|
|
|
def interact(self, escape_character=chr(29),
|
|
|
input_filter=None, output_filter=None):
|
|
|
|
|
|
'''This gives control of the child process to the interactive user (the
|
|
|
human at the keyboard). Keystrokes are sent to the child process, and
|
|
|
the stdout and stderr output of the child process is printed. This
|
|
|
simply echos the child stdout and child stderr to the real stdout and
|
|
|
it echos the real stdin to the child stdin. When the user types the
|
|
|
escape_character this method will stop. The default for
|
|
|
escape_character is ^]. This should not be confused with ASCII 27 --
|
|
|
the ESC character. ASCII 29 was chosen for historical merit because
|
|
|
this is the character used by 'telnet' as the escape character. The
|
|
|
escape_character will not be sent to the child process.
|
|
|
|
|
|
You may pass in optional input and output filter functions. These
|
|
|
functions should take a string and return a string. The output_filter
|
|
|
will be passed all the output from the child process. The input_filter
|
|
|
will be passed all the keyboard input from the user. The input_filter
|
|
|
is run BEFORE the check for the escape_character.
|
|
|
|
|
|
Note that if you change the window size of the parent the SIGWINCH
|
|
|
signal will not be passed through to the child. If you want the child
|
|
|
window size to change when the parent's window size changes then do
|
|
|
something like the following example::
|
|
|
|
|
|
import pexpect, struct, fcntl, termios, signal, sys
|
|
|
def sigwinch_passthrough (sig, data):
|
|
|
s = struct.pack("HHHH", 0, 0, 0, 0)
|
|
|
a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.fileno(),
|
|
|
termios.TIOCGWINSZ , s))
|
|
|
global p
|
|
|
p.setwinsize(a[0],a[1])
|
|
|
# Note this 'p' global and used in sigwinch_passthrough.
|
|
|
p = pexpect.spawn('/bin/bash')
|
|
|
signal.signal(signal.SIGWINCH, sigwinch_passthrough)
|
|
|
p.interact()
|
|
|
'''
|
|
|
|
|
|
# Flush the buffer.
|
|
|
self.write_to_stdout(self.buffer)
|
|
|
self.stdout.flush()
|
|
|
self.buffer = self.string_type()
|
|
|
mode = tty.tcgetattr(self.STDIN_FILENO)
|
|
|
tty.setraw(self.STDIN_FILENO)
|
|
|
if PY3:
|
|
|
escape_character = escape_character.encode('latin-1')
|
|
|
try:
|
|
|
self.__interact_copy(escape_character, input_filter, output_filter)
|
|
|
finally:
|
|
|
tty.tcsetattr(self.STDIN_FILENO, tty.TCSAFLUSH, mode)
|
|
|
|
|
|
def __interact_writen(self, fd, data):
|
|
|
'''This is used by the interact() method.
|
|
|
'''
|
|
|
|
|
|
while data != b'' and self.isalive():
|
|
|
n = os.write(fd, data)
|
|
|
data = data[n:]
|
|
|
|
|
|
def __interact_read(self, fd):
|
|
|
'''This is used by the interact() method.
|
|
|
'''
|
|
|
|
|
|
return os.read(fd, 1000)
|
|
|
|
|
|
def __interact_copy(self, escape_character=None,
|
|
|
input_filter=None, output_filter=None):
|
|
|
|
|
|
'''This is used by the interact() method.
|
|
|
'''
|
|
|
|
|
|
while self.isalive():
|
|
|
r, w, e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
|
|
|
if self.child_fd in r:
|
|
|
try:
|
|
|
data = self.__interact_read(self.child_fd)
|
|
|
except OSError as e:
|
|
|
# The subprocess may have closed before we get to reading it
|
|
|
if e.errno != errno.EIO:
|
|
|
raise
|
|
|
if output_filter:
|
|
|
data = output_filter(data)
|
|
|
if self.logfile is not None:
|
|
|
self.logfile.write(data)
|
|
|
self.logfile.flush()
|
|
|
os.write(self.STDOUT_FILENO, data)
|
|
|
if self.STDIN_FILENO in r:
|
|
|
data = self.__interact_read(self.STDIN_FILENO)
|
|
|
if input_filter:
|
|
|
data = input_filter(data)
|
|
|
i = data.rfind(escape_character)
|
|
|
if i != -1:
|
|
|
data = data[:i]
|
|
|
self.__interact_writen(self.child_fd, data)
|
|
|
break
|
|
|
self.__interact_writen(self.child_fd, data)
|
|
|
|
|
|
def __select(self, iwtd, owtd, ewtd, timeout=None):
|
|
|
|
|
|
'''This is a wrapper around select.select() that ignores signals. If
|
|
|
select.select raises a select.error exception and errno is an EINTR
|
|
|
error then it is ignored. Mainly this is used to ignore sigwinch
|
|
|
(terminal resize). '''
|
|
|
|
|
|
# if select() is interrupted by a signal (errno==EINTR) then
|
|
|
# we loop back and enter the select() again.
|
|
|
if timeout is not None:
|
|
|
end_time = time.time() + timeout
|
|
|
while True:
|
|
|
try:
|
|
|
return select.select(iwtd, owtd, ewtd, timeout)
|
|
|
except select.error:
|
|
|
err = sys.exc_info()[1]
|
|
|
if err.args[0] == errno.EINTR:
|
|
|
# if we loop back we have to subtract the
|
|
|
# amount of time we already waited.
|
|
|
if timeout is not None:
|
|
|
timeout = end_time - time.time()
|
|
|
if timeout < 0:
|
|
|
return([], [], [])
|
|
|
else:
|
|
|
# something else caused the select.error, so
|
|
|
# this actually is an exception.
|
|
|
raise
|
|
|
|
|
|
##############################################################################
|
|
|
# The following methods are no longer supported or allowed.
|
|
|
|
|
|
def setmaxread(self, maxread):
|
|
|
|
|
|
'''This method is no longer supported or allowed. I don't like getters
|
|
|
and setters without a good reason. '''
|
|
|
|
|
|
raise ExceptionPexpect('This method is no longer supported ' +
|
|
|
'or allowed. Just assign a value to the ' +
|
|
|
'maxread member variable.')
|
|
|
|
|
|
def setlog(self, fileobject):
|
|
|
|
|
|
'''This method is no longer supported or allowed.
|
|
|
'''
|
|
|
|
|
|
raise ExceptionPexpect('This method is no longer supported ' +
|
|
|
'or allowed. Just assign a value to the logfile ' +
|
|
|
'member variable.')
|
|
|
|
|
|
##############################################################################
|
|
|
# End of spawn class
|
|
|
##############################################################################
|
|
|
|
|
|
class spawnu(spawn):
|
|
|
"""Works like spawn, but accepts and returns unicode strings.
|
|
|
|
|
|
Extra parameters:
|
|
|
|
|
|
:param encoding: The encoding to use for communications (default: 'utf-8')
|
|
|
:param errors: How to handle encoding/decoding errors; one of 'strict'
|
|
|
(the default), 'ignore', or 'replace', as described
|
|
|
for :meth:`~bytes.decode` and :meth:`~str.encode`.
|
|
|
"""
|
|
|
if PY3:
|
|
|
string_type = str
|
|
|
allowed_string_types = (str, )
|
|
|
_chr = staticmethod(chr)
|
|
|
linesep = os.linesep
|
|
|
else:
|
|
|
string_type = unicode
|
|
|
allowed_string_types = (unicode, )
|
|
|
_chr = staticmethod(unichr)
|
|
|
linesep = os.linesep.decode('ascii')
|
|
|
# This can handle unicode in both Python 2 and 3
|
|
|
write_to_stdout = sys.stdout.write
|
|
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
|
self.encoding = kwargs.pop('encoding', 'utf-8')
|
|
|
self.errors = kwargs.pop('errors', 'strict')
|
|
|
self._decoder = codecs.getincrementaldecoder(self.encoding)(errors=self.errors)
|
|
|
super(spawnu, self).__init__(*args, **kwargs)
|
|
|
|
|
|
@staticmethod
|
|
|
def _coerce_expect_string(s):
|
|
|
return s
|
|
|
|
|
|
@staticmethod
|
|
|
def _coerce_send_string(s):
|
|
|
return s
|
|
|
|
|
|
def _coerce_read_string(self, s):
|
|
|
return self._decoder.decode(s, final=False)
|
|
|
|
|
|
def _send(self, s):
|
|
|
return os.write(self.child_fd, s.encode(self.encoding, self.errors))
|
|
|
|
|
|
|
|
|
class searcher_string(object):
|
|
|
|
|
|
'''This is a plain string search helper for the spawn.expect_any() method.
|
|
|
This helper class is for speed. For more powerful regex patterns
|
|
|
see the helper class, searcher_re.
|
|
|
|
|
|
Attributes:
|
|
|
|
|
|
eof_index - index of EOF, or -1
|
|
|
timeout_index - index of TIMEOUT, or -1
|
|
|
|
|
|
After a successful match by the search() method the following attributes
|
|
|
are available:
|
|
|
|
|
|
start - index into the buffer, first byte of match
|
|
|
end - index into the buffer, first byte after match
|
|
|
match - the matching string itself
|
|
|
|
|
|
'''
|
|
|
|
|
|
def __init__(self, strings):
|
|
|
|
|
|
'''This creates an instance of searcher_string. This argument 'strings'
|
|
|
may be a list; a sequence of strings; or the EOF or TIMEOUT types. '''
|
|
|
|
|
|
self.eof_index = -1
|
|
|
self.timeout_index = -1
|
|
|
self._strings = []
|
|
|
for n, s in enumerate(strings):
|
|
|
if s is EOF:
|
|
|
self.eof_index = n
|
|
|
continue
|
|
|
if s is TIMEOUT:
|
|
|
self.timeout_index = n
|
|
|
continue
|
|
|
self._strings.append((n, s))
|
|
|
|
|
|
def __str__(self):
|
|
|
|
|
|
'''This returns a human-readable string that represents the state of
|
|
|
the object.'''
|
|
|
|
|
|
ss = [(ns[0], ' %d: "%s"' % ns) for ns in self._strings]
|
|
|
ss.append((-1, 'searcher_string:'))
|
|
|
if self.eof_index >= 0:
|
|
|
ss.append((self.eof_index, ' %d: EOF' % self.eof_index))
|
|
|
if self.timeout_index >= 0:
|
|
|
ss.append((self.timeout_index,
|
|
|
' %d: TIMEOUT' % self.timeout_index))
|
|
|
ss.sort()
|
|
|
ss = list(zip(*ss))[1]
|
|
|
return '\n'.join(ss)
|
|
|
|
|
|
def search(self, buffer, freshlen, searchwindowsize=None):
|
|
|
|
|
|
'''This searches 'buffer' for the first occurence of one of the search
|
|
|
strings. 'freshlen' must indicate the number of bytes at the end of
|
|
|
'buffer' which have not been searched before. It helps to avoid
|
|
|
searching the same, possibly big, buffer over and over again.
|
|
|
|
|
|
See class spawn for the 'searchwindowsize' argument.
|
|
|
|
|
|
If there is a match this returns the index of that string, and sets
|
|
|
'start', 'end' and 'match'. Otherwise, this returns -1. '''
|
|
|
|
|
|
first_match = None
|
|
|
|
|
|
# 'freshlen' helps a lot here. Further optimizations could
|
|
|
# possibly include:
|
|
|
#
|
|
|
# using something like the Boyer-Moore Fast String Searching
|
|
|
# Algorithm; pre-compiling the search through a list of
|
|
|
# strings into something that can scan the input once to
|
|
|
# search for all N strings; realize that if we search for
|
|
|
# ['bar', 'baz'] and the input is '...foo' we need not bother
|
|
|
# rescanning until we've read three more bytes.
|
|
|
#
|
|
|
# Sadly, I don't know enough about this interesting topic. /grahn
|
|
|
|
|
|
for index, s in self._strings:
|
|
|
if searchwindowsize is None:
|
|
|
# the match, if any, can only be in the fresh data,
|
|
|
# or at the very end of the old data
|
|
|
offset = -(freshlen + len(s))
|
|
|
else:
|
|
|
# better obey searchwindowsize
|
|
|
offset = -searchwindowsize
|
|
|
n = buffer.find(s, offset)
|
|
|
if n >= 0 and (first_match is None or n < first_match):
|
|
|
first_match = n
|
|
|
best_index, best_match = index, s
|
|
|
if first_match is None:
|
|
|
return -1
|
|
|
self.match = best_match
|
|
|
self.start = first_match
|
|
|
self.end = self.start + len(self.match)
|
|
|
return best_index
|
|
|
|
|
|
|
|
|
class searcher_re(object):
|
|
|
|
|
|
'''This is regular expression string search helper for the
|
|
|
spawn.expect_any() method. This helper class is for powerful
|
|
|
pattern matching. For speed, see the helper class, searcher_string.
|
|
|
|
|
|
Attributes:
|
|
|
|
|
|
eof_index - index of EOF, or -1
|
|
|
timeout_index - index of TIMEOUT, or -1
|
|
|
|
|
|
After a successful match by the search() method the following attributes
|
|
|
are available:
|
|
|
|
|
|
start - index into the buffer, first byte of match
|
|
|
end - index into the buffer, first byte after match
|
|
|
match - the re.match object returned by a succesful re.search
|
|
|
|
|
|
'''
|
|
|
|
|
|
def __init__(self, patterns):
|
|
|
|
|
|
'''This creates an instance that searches for 'patterns' Where
|
|
|
'patterns' may be a list or other sequence of compiled regular
|
|
|
expressions, or the EOF or TIMEOUT types.'''
|
|
|
|
|
|
self.eof_index = -1
|
|
|
self.timeout_index = -1
|
|
|
self._searches = []
|
|
|
for n, s in zip(list(range(len(patterns))), patterns):
|
|
|
if s is EOF:
|
|
|
self.eof_index = n
|
|
|
continue
|
|
|
if s is TIMEOUT:
|
|
|
self.timeout_index = n
|
|
|
continue
|
|
|
self._searches.append((n, s))
|
|
|
|
|
|
def __str__(self):
|
|
|
|
|
|
'''This returns a human-readable string that represents the state of
|
|
|
the object.'''
|
|
|
|
|
|
#ss = [(n, ' %d: re.compile("%s")' %
|
|
|
# (n, repr(s.pattern))) for n, s in self._searches]
|
|
|
ss = list()
|
|
|
for n, s in self._searches:
|
|
|
try:
|
|
|
ss.append((n, ' %d: re.compile("%s")' % (n, s.pattern)))
|
|
|
except UnicodeEncodeError:
|
|
|
# for test cases that display __str__ of searches, dont throw
|
|
|
# another exception just because stdout is ascii-only, using
|
|
|
# repr()
|
|
|
ss.append((n, ' %d: re.compile(%r)' % (n, s.pattern)))
|
|
|
ss.append((-1, 'searcher_re:'))
|
|
|
if self.eof_index >= 0:
|
|
|
ss.append((self.eof_index, ' %d: EOF' % self.eof_index))
|
|
|
if self.timeout_index >= 0:
|
|
|
ss.append((self.timeout_index, ' %d: TIMEOUT' %
|
|
|
self.timeout_index))
|
|
|
ss.sort()
|
|
|
ss = list(zip(*ss))[1]
|
|
|
return '\n'.join(ss)
|
|
|
|
|
|
def search(self, buffer, freshlen, searchwindowsize=None):
|
|
|
|
|
|
'''This searches 'buffer' for the first occurence of one of the regular
|
|
|
expressions. 'freshlen' must indicate the number of bytes at the end of
|
|
|
'buffer' which have not been searched before.
|
|
|
|
|
|
See class spawn for the 'searchwindowsize' argument.
|
|
|
|
|
|
If there is a match this returns the index of that string, and sets
|
|
|
'start', 'end' and 'match'. Otherwise, returns -1.'''
|
|
|
|
|
|
first_match = None
|
|
|
# 'freshlen' doesn't help here -- we cannot predict the
|
|
|
# length of a match, and the re module provides no help.
|
|
|
if searchwindowsize is None:
|
|
|
searchstart = 0
|
|
|
else:
|
|
|
searchstart = max(0, len(buffer) - searchwindowsize)
|
|
|
for index, s in self._searches:
|
|
|
match = s.search(buffer, searchstart)
|
|
|
if match is None:
|
|
|
continue
|
|
|
n = match.start()
|
|
|
if first_match is None or n < first_match:
|
|
|
first_match = n
|
|
|
the_match = match
|
|
|
best_index = index
|
|
|
if first_match is None:
|
|
|
return -1
|
|
|
self.start = first_match
|
|
|
self.match = the_match
|
|
|
self.end = self.match.end()
|
|
|
return best_index
|
|
|
|
|
|
|
|
|
def which(filename):
|
|
|
|
|
|
'''This takes a given filename; tries to find it in the environment path;
|
|
|
then checks if it is executable. This returns the full path to the filename
|
|
|
if found and executable. Otherwise this returns None.'''
|
|
|
|
|
|
# Special case where filename contains an explicit path.
|
|
|
if os.path.dirname(filename) != '':
|
|
|
if os.access(filename, os.X_OK):
|
|
|
return filename
|
|
|
if 'PATH' not in os.environ or os.environ['PATH'] == '':
|
|
|
p = os.defpath
|
|
|
else:
|
|
|
p = os.environ['PATH']
|
|
|
pathlist = p.split(os.pathsep)
|
|
|
for path in pathlist:
|
|
|
ff = os.path.join(path, filename)
|
|
|
if os.access(ff, os.X_OK):
|
|
|
return ff
|
|
|
return None
|
|
|
|
|
|
|
|
|
def split_command_line(command_line):
|
|
|
|
|
|
'''This splits a command line into a list of arguments. It splits arguments
|
|
|
on spaces, but handles embedded quotes, doublequotes, and escaped
|
|
|
characters. It's impossible to do this with a regular expression, so I
|
|
|
wrote a little state machine to parse the command line. '''
|
|
|
|
|
|
arg_list = []
|
|
|
arg = ''
|
|
|
|
|
|
# Constants to name the states we can be in.
|
|
|
state_basic = 0
|
|
|
state_esc = 1
|
|
|
state_singlequote = 2
|
|
|
state_doublequote = 3
|
|
|
# The state when consuming whitespace between commands.
|
|
|
state_whitespace = 4
|
|
|
state = state_basic
|
|
|
|
|
|
for c in command_line:
|
|
|
if state == state_basic or state == state_whitespace:
|
|
|
if c == '\\':
|
|
|
# Escape the next character
|
|
|
state = state_esc
|
|
|
elif c == r"'":
|
|
|
# Handle single quote
|
|
|
state = state_singlequote
|
|
|
elif c == r'"':
|
|
|
# Handle double quote
|
|
|
state = state_doublequote
|
|
|
elif c.isspace():
|
|
|
# Add arg to arg_list if we aren't in the middle of whitespace.
|
|
|
if state == state_whitespace:
|
|
|
# Do nothing.
|
|
|
None
|
|
|
else:
|
|
|
arg_list.append(arg)
|
|
|
arg = ''
|
|
|
state = state_whitespace
|
|
|
else:
|
|
|
arg = arg + c
|
|
|
state = state_basic
|
|
|
elif state == state_esc:
|
|
|
arg = arg + c
|
|
|
state = state_basic
|
|
|
elif state == state_singlequote:
|
|
|
if c == r"'":
|
|
|
state = state_basic
|
|
|
else:
|
|
|
arg = arg + c
|
|
|
elif state == state_doublequote:
|
|
|
if c == r'"':
|
|
|
state = state_basic
|
|
|
else:
|
|
|
arg = arg + c
|
|
|
|
|
|
if arg != '':
|
|
|
arg_list.append(arg)
|
|
|
return arg_list
|
|
|
|
|
|
# vi:set sr et ts=4 sw=4 ft=python :
|
|
|
|
