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#
# Copyright (C) 2016 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 Van Berkom <tristan.vanberkom@codethink.co.uk>
"""
stack - Symbolic Element for dependency grouping
================================================
Stack elements are simply a symbolic element used for representing
a logical group of elements.
"""
from buildstream import Element
# Element implementation for the 'stack' kind.
class StackElement(Element):
# pylint: disable=attribute-defined-outside-init
BST_MIN_VERSION = "2.0"
# This plugin does not produce any artifacts when built
BST_ELEMENT_HAS_ARTIFACT = False
# This element does not allow sources
BST_FORBID_SOURCES = True
# Stack elements do not run any commands
BST_RUN_COMMANDS = False
def configure(self, node):
pass
def preflight(self):
pass
def get_unique_key(self):
# We do not add anything to the build, only our dependencies
# do, so our unique key is just a constant.
return 1
def configure_sandbox(self, sandbox):
pass
def stage(self, sandbox):
pass
def assemble(self, sandbox):
# Just create a dummy empty artifact, its existence is a statement
# that all this stack's dependencies are built.
vrootdir = sandbox.get_virtual_directory()
vrootdir.descend("output", create=True)
# And we're done
return "/output"
# Plugin entry point
def setup():
return StackElement
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