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# -*- coding: utf-8 -*-
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#
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# 2016 Darko Poljak (darko.poljak at gmail.com)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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def inspect_ssh_mux_opts():
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"""Inspect whether or not ssh supports multiplexing options.
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Return string containing multiplexing options if supported.
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If ControlPath is supported then placeholder for that path is
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specified and can be used for final string formatting.
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For example, this function can return string:
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"-o ControlMaster=auto -o ControlPersist=125 -o ControlPath={}".
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Then it can be formatted:
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mux_opts_string.format('/tmp/tmpxxxxxx/ssh-control-path').
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"""
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import subprocess
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wanted_mux_opts = {
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"ControlPath": "{}",
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"ControlMaster": "auto",
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"ControlPersist": "2h",
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}
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mux_opts = " ".join([" -o {}={}".format(
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x, wanted_mux_opts[x]) for x in wanted_mux_opts])
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try:
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subprocess.check_output("ssh {}".format(mux_opts),
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stderr=subprocess.STDOUT, shell=True)
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except subprocess.CalledProcessError as e:
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subproc_output = e.output.decode().lower()
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if "bad configuration option" in subproc_output:
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return ""
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return mux_opts
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