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mitogen/mitogen/lxc.py

76 lines
2.8 KiB
Python

# Copyright 2017, David Wilson
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# !mitogen: minify_safe
import logging
import mitogen.core
import mitogen.parent
LOG = logging.getLogger(__name__)
class Stream(mitogen.parent.Stream):
child_is_immediate_subprocess = False
create_child_args = {
# If lxc-attach finds any of stdin, stdout, stderr connected to a TTY,
# to prevent input injection it creates a proxy pty, forcing all IO to
# be buffered in <4KiB chunks. So ensure stderr is also routed to the
# socketpair.
'merge_stdio': True
}
container = None
lxc_attach_path = 'lxc-attach'
eof_error_hint = (
'Note: many versions of LXC do not report program execution failure '
'meaningfully. Please check the host logs (/var/log) for more '
'information.'
)
def construct(self, container, lxc_attach_path=None, **kwargs):
super(Stream, self).construct(**kwargs)
self.container = container
if lxc_attach_path:
self.lxc_attach_path = lxc_attach_path
def _get_name(self):
return u'lxc.' + self.container
def get_boot_command(self):
bits = [
self.lxc_attach_path,
'--clear-env',
'--name', self.container,
'--',
]
return bits + super(Stream, self).get_boot_command()