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#
# Copyright (C) 2017 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Maat <tristan.maat@codethink.co.uk>
import subprocess
from .. import _site
from .. import utils
from .._artifactcache.cascache import CASCache
from .._message import Message, MessageType
from ..sandbox import SandboxBwrap
from . import Platform
class Linux(Platform):
def __init__(self, context, project):
super().__init__(context, project)
self._die_with_parent_available = _site.check_bwrap_version(0, 1, 8)
self._user_ns_available = self._check_user_ns_available(context)
self._artifact_cache = CASCache(context, enable_push=self._user_ns_available)
@property
def artifactcache(self):
return self._artifact_cache
def create_sandbox(self, *args, **kwargs):
# Inform the bubblewrap sandbox as to whether it can use user namespaces or not
kwargs['user_ns_available'] = self._user_ns_available
kwargs['die_with_parent_available'] = self._die_with_parent_available
return SandboxBwrap(*args, **kwargs)
################################################
# Private Methods #
################################################
def _check_user_ns_available(self, context):
# Here, lets check if bwrap is able to create user namespaces,
# issue a warning if it's not available, and save the state
# locally so that we can inform the sandbox to not try it
# later on.
bwrap = utils.get_host_tool('bwrap')
whoami = utils.get_host_tool('whoami')
try:
output = subprocess.check_output([
bwrap,
'--ro-bind', '/', '/',
'--unshare-user',
'--uid', '0', '--gid', '0',
whoami,
])
output = output.decode('UTF-8').strip()
except subprocess.CalledProcessError:
output = ''
if output == 'root':
return True
else:
context.message(
Message(None, MessageType.WARN,
"Unable to create user namespaces with bubblewrap, resorting to fallback",
detail="Some builds may not function due to lack of uid / gid 0, " +
"artifacts created will not be trusted for push purposes."))
return False
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