Synnefo » snf-image-creator

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"""This module provides an interface for the WinEXE utility"""

import subprocess

import time

import signal

from image_creator.util import FatalError

class WinexeTimeout(FatalError):

    """Raised when a WinExE command times-out"""

    pass

class WinEXE:

    """Wrapper class for the winexe command"""

    def __init__(self, username, password, hostname, program='winexe'):

        self._host = hostname

        self._user = username

        self._pass = password

        self._prog = program

        # -U USERNAME[%PASSWORD]

        user = '%s%s' % (self._user, '%%%s' % self._pass if self._pass else "")

        self._opts = ['-U', user]

    def reset(self):

        """Reset all winexe options"""

        # -U USERNAME[%PASSWORD]

        user = '%s%s' % (self._user, '%%%s' % self._pass if self._pass else "")

        self._opts = ['-U', user]

    def runas(self, username, password):

        """Run command as this user"""

        self._opts.append('--runas=%s%%%s' % (username, password))

        return self

    def system(self):

        """Use SYSTEM account"""

        self._opts.append('--system')

        return self

    def uninstall(self):

        """Uninstall winexe service after remote execution"""

        self._opts.append('--uninstall')

        return self

    def reinstall(self):

        """Reinstall winexe service before remote execution"""

        self._opts.append('--reinstall')

        return self

    def debug(self, level):

        """Set debug level"""

        self._opts.append('--debuglevel=%d' % level)

        return self

    def debug_stderr(self):

        """Send debug output to STDERR"""

        self._opts.append('--debug-stderr')

    def run(self, command, timeout=0):

        """Run a command on a remote windows system"""

        args = [self._prog] + self._opts + ["//%s" % self._host] + [command]

        run = subprocess.Popen(args, stdout=subprocess.PIPE,

                               stderr=subprocess.PIPE)

        def handler(signum, frame):

            run.terminate()

            time.sleep(1)

            run.poll()

            if run.returncode is None:

                run.kill()

            run.wait()

            raise WinexeTimeout("Command: `%s' timed-out" % " ".join(args))

        signal.signal(signal.SIGALRM, handler)

        signal.alarm(timeout)

        stdout, stderr = run.communicate()

        rc = run.poll()

        signal.alarm(0)

        return (stdout, stderr, rc)

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