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Viewing changes to ivle/interpret.py

  • Committer: William Grant
  • Date: 2010-02-23 06:35:12 UTC
  • Revision ID: grantw@unimelb.edu.au-20100223063512-z9rq15f7tw8jm4nd
Tweak console docs a bit.

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ivle/interpret.py
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# Runs a student script in a safe execution environment.
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import ivle
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from ivle import studpath
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from ivle.util import IVLEError, IVLEJailError
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import ivle.conf
 
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from ivle.util import IVLEError, IVLEJailError, split_path
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import functools
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        self.linebuf = ""
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        self.headers = {}       # Header names : values
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def execute_cgi(interpreter, trampoline, uid, jail_dir, working_dir,
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                script_path, req, gentle):
 
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def execute_cgi(interpreter, uid, jail_dir, working_dir, script_path,
 
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                req, gentle):
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    """
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    trampoline: Full path on the local system to the CGI wrapper program
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        being executed.
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    its environment.
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    """
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    trampoline = os.path.join(req.config['paths']['lib'], 'trampoline')
 
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    # Support no-op trampoline runs.
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    if interpreter is None:
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        interpreter = '/bin/true'
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    fixup_environ(req, script_path)
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    # usage: tramp uid jail_dir working_dir script_path
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    pid = subprocess.Popen(
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        [trampoline, str(uid), jail_dir, working_dir, interpreter,
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        script_path],
 
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    cmd_line = [trampoline, str(uid), req.config['paths']['jails']['mounts'],
 
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         req.config['paths']['jails']['src'],
 
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         req.config['paths']['jails']['template'],
 
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         jail_dir, working_dir, interpreter, script_path]
 
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    # Popen doesn't like unicode strings. It hateses them.
 
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    cmd_line = [(s.encode('utf-8') if isinstance(s, unicode) else s)
 
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                for s in cmd_line]
 
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    pid = subprocess.Popen(cmd_line,
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        stdin=f, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
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        cwd=tramp_dir)
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    <pre>
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""" % (warning, text))
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location_cgi_python = os.path.join(ivle.conf.lib_path, "trampoline")
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# Mapping of interpreter names (as given in conf/app/server.py) to
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# interpreter functions.
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interpreter_objects = {
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    'cgi-python'
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        : functools.partial(execute_cgi, "/usr/bin/python",
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            location_cgi_python),
 
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        : functools.partial(execute_cgi, "/usr/bin/python"),
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    'noop'
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        : functools.partial(execute_cgi, None,
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            location_cgi_python),
 
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        : functools.partial(execute_cgi, None),
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    # Should also have:
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    # cgi-generic
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    # python-server-page
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    if script_path and script_path.startswith('/home'):
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        normscript = os.path.normpath(script_path)
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        uri_into_jail = studpath.url_to_jailpaths(os.path.normpath(req.path))[2]
 
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        uri_into_jail = studpath.to_home_path(os.path.normpath(req.path))
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        # PATH_INFO is wrong because the script doesn't physically exist.
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        env['PATH_INFO'] = uri_into_jail[len(normscript):]
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    # SERVER_SOFTWARE is actually not Apache but IVLE, since we are
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    # custom-making the CGI request.
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    env['SERVER_SOFTWARE'] = "IVLE/" + str(ivle.conf.ivle_version)
 
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    env['SERVER_SOFTWARE'] = "IVLE/" + ivle.__version__
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    # Additional environment variables
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    username = studpath.url_to_jailpaths(req.path)[0]
 
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    username = split_path(req.path)[0]
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    env['HOME'] = os.path.join('/home', username)
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class ExecutionError(Exception):
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    pass
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def execute_raw(user, jail_dir, working_dir, binary, args):
 
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def execute_raw(config, user, jail_dir, working_dir, binary, args):
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    '''Execute a binary in a user's jail, returning the raw output.
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    The binary is executed in the given working directory with the given
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    args. A tuple of (stdout, stderr) is returned.
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    '''
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    tramp = location_cgi_python
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    tramp_dir = os.path.split(location_cgi_python)[0]
 
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    tramp = os.path.join(config['paths']['lib'], 'trampoline')
 
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    tramp_dir = os.path.split(tramp)[0]
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    # Fire up trampoline. Vroom, vroom.
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    proc = subprocess.Popen(
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        [tramp, str(user.unixid), jail_dir, working_dir, binary] + args,
 
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    cmd_line = [tramp, str(user.unixid), config['paths']['jails']['mounts'],
 
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         config['paths']['jails']['src'],
 
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         config['paths']['jails']['template'],
 
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         jail_dir, working_dir, binary] + args
 
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    # Popen doesn't like unicode strings. It hateses them.
 
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    cmd_line = [(s.encode('utf-8') if isinstance(s, unicode) else s)
 
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                for s in cmd_line]
 
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    proc = subprocess.Popen(cmd_line,
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        stdin=subprocess.PIPE, stdout=subprocess.PIPE,
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        stderr=subprocess.PIPE, cwd=tramp_dir, close_fds=True)
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    exitcode = proc.wait()
 
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    (stdout, stderr) = proc.communicate()
 
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    exitcode = proc.returncode
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    if exitcode != 0:
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        raise ExecutionError('subprocess ended with code %d, stderr %s' %
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                             (exitcode, proc.stderr.read()))
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    return (proc.stdout.read(), proc.stderr.read())
 
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    return (stdout, stderr)