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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
# 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 <>.
# Authors:
# Tristan Van Berkom <>
stack - Symbolic Element for dependency grouping
Stack elements are simply a symbolic element used for representing
a logical group of elements.
import os
from buildstream import Element
# Element implementation for the 'stack' kind.
class StackElement(Element):
def configure(self, node):
def preflight(self):
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):
def stage(self, sandbox):
def assemble(self, sandbox):
# Just create a dummy empty artifact, its existence is a statement
# that all this stack's dependencies are built.
rootdir = sandbox.get_directory()
# XXX FIXME: This is currently needed because the artifact
# cache wont let us commit an empty artifact.
# We need to fix the artifact cache so that it stores
# the actual artifact data in a subdirectory, then we
# will be able to store some additional state in the
# artifact cache, and we can also remove this hack.
outputdir = os.path.join(rootdir, 'output', 'bst')
# Ensure target directory parent
os.makedirs(os.path.dirname(outputdir), exist_ok=True)
# And we're done
return '/output'
# Plugin entry point
def setup():
return StackElement