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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 os
import sys
import resource
from .._exceptions import PlatformError, ImplError
class Platform():
_instance = None
# Platform()
#
# A class to manage platform-specific details. Currently holds the
# sandbox factory as well as platform helpers.
#
def __init__(self):
self.set_resource_limits()
@classmethod
def _create_instance(cls):
# Meant for testing purposes and therefore hidden in the
# deepest corners of the source code. Try not to abuse this,
# please?
if os.getenv('BST_FORCE_BACKEND'):
backend = os.getenv('BST_FORCE_BACKEND')
elif sys.platform.startswith('linux'):
backend = 'linux'
elif sys.platform.startswith('darwin'):
backend = 'darwin'
else:
backend = 'unix'
if backend == 'linux':
from .linux import Linux as PlatformImpl
elif backend == 'darwin':
from .darwin import Darwin as PlatformImpl
elif backend == 'unix':
from .unix import Unix as PlatformImpl
else:
raise PlatformError("No such platform: '{}'".format(backend))
cls._instance = PlatformImpl()
@classmethod
def get_platform(cls):
if not cls._instance:
cls._create_instance()
return cls._instance
def get_cpu_count(self, cap=None):
cpu_count = len(os.sched_getaffinity(0))
if cap is None:
return cpu_count
else:
return min(cpu_count, cap)
##################################################################
# Sandbox functions #
##################################################################
# create_sandbox():
#
# Create a build sandbox suitable for the environment
#
# Args:
# args (dict): The arguments to pass to the sandbox constructor
# kwargs (file): The keyword arguments to pass to the sandbox constructor
#
# Returns:
# (Sandbox) A sandbox
#
def create_sandbox(self, *args, **kwargs):
raise ImplError("Platform {platform} does not implement create_sandbox()"
.format(platform=type(self).__name__))
def check_sandbox_config(self, config):
raise ImplError("Platform {platform} does not implement check_sandbox_config()"
.format(platform=type(self).__name__))
def set_resource_limits(self, soft_limit=None, hard_limit=None):
# Need to set resources for _frontend/app.py as this is dependent on the platform
# SafeHardlinks FUSE needs to hold file descriptors for all processes in the sandbox.
# Avoid hitting the limit too quickly.
limits = resource.getrlimit(resource.RLIMIT_NOFILE)
if limits[0] != limits[1]:
if soft_limit is None:
soft_limit = limits[1]
if hard_limit is None:
hard_limit = limits[1]
resource.setrlimit(resource.RLIMIT_NOFILE, (soft_limit, hard_limit))
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