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#!/usr/bin/env python3
#
# 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 Van Berkom <tristan.vanberkom@codethink.co.uk>
# Jonathan Maw <jonathan.maw@codethink.co.uk>
"""Script element
This element allows one to run some commands to mutate the
input and create some output.
.. note::
Script elements may only specify build dependencies. See
:ref:`the format documentation <format_dependencies>` for more
detail on specifying dependencies.
The default configuration and possible options are as such:
.. literalinclude:: ../../../buildstream/plugins/elements/script.yaml
:language: yaml
"""
import buildstream
# Element implementation for the 'script' kind.
class ScriptElement(buildstream.ScriptElement):
def configure(self, node):
for n in self.node_get_member(node, list, 'layout', []):
dst = self.node_subst_member(n, 'destination')
elm = self.node_subst_member(n, 'element', default_value='') or None
self.layout_add(elm, dst)
cmds = []
prefixes = ["pre-", "", "post-"]
if "commands" not in node:
raise ElementError("{}: Unexpectedly missing command group 'commands'"
.format(self))
for prefix in prefixes:
if prefix + "commands" in node:
cmds += self.node_subst_list(node, prefix + "commands")
self.add_commands("commands", cmds)
self.set_work_dir()
self.set_install_root()
self.set_root_read_only(self.node_get_member(node, bool,
'root-read-only', False))
# Plugin entry point
def setup():
return ScriptElement
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