52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
# This file is part of Cockpit.
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#
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# Copyright (C) 2013 Red Hat, Inc.
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#
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# Cockpit is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# Cockpit is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Cockpit; If not, see <http://www.gnu.org/licenses/>.
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import signal
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class Timeout:
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""" Add a timeout to an operation
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Specify machine to ensure that a machine's ssh operations are canceled when the timer expires.
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"""
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def __init__(self, seconds=1, error_message='Timeout', machine=None):
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if signal.getsignal(signal.SIGALRM) != signal.SIG_DFL:
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# there is already a different Timeout active
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self.seconds = None
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return
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self.seconds = seconds
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self.error_message = error_message
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self.machine = machine
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def handle_timeout(self, signum, frame):
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if self.machine:
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if self.machine.ssh_process:
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self.machine.ssh_process.terminate()
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self.machine.disconnect()
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raise RuntimeError(self.error_message)
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def __enter__(self):
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if self.seconds:
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signal.signal(signal.SIGALRM, self.handle_timeout)
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signal.alarm(self.seconds)
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def __exit__(self, type, value, traceback):
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if self.seconds:
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signal.alarm(0)
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signal.signal(signal.SIGALRM, signal.SIG_DFL)
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