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#!/usr/bin/env python3
#
# 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>
# Jürg Billeter <juerg.billeter@codethink.co.uk>
# System imports
import os
# BuildStream toplevel imports
from .. import Consistency
from ..plugin import _plugin_lookup
from .. import _yaml
# Local imports
from . import Queue, QueueType
# A queue which tracks sources
#
class TrackQueue(Queue):
action_name = "Track"
complete_name = "Tracked"
queue_type = QueueType.FETCH
def __init__(self):
super(TrackQueue, self).__init__()
def process(self, element):
return element._track()
def skip(self, element):
# We can skip elements entirely if they have no sources.
return len(list(element.sources())) == 0
def done(self, element, result, returncode):
if returncode != 0:
return False
changed = False
# Set the new refs in the main process one by one as they complete
for unique_id, new_ref in result:
source = _plugin_lookup(unique_id)
if source._set_ref(new_ref, source._Source__origin_node):
changed = True
project = source.get_project()
toplevel = source._Source__origin_toplevel
filename = source._Source__origin_filename
fullname = os.path.join(project.element_path, filename)
# Here we are in master process, what to do if writing
# to the disk fails for some reason ?
try:
_yaml.dump(toplevel, fullname)
except OSError as e:
source.error("Failed to update project file",
detail="{}: Failed to rewrite tracked source to file {}: {}"
.format(source, fullname, e))
# Forcefully recalculate the element's consistency state after successfully
# tracking, this is avoid a following fetch queue operating on the sources
# if the tracked ref is cached as a result.
#
context = element.get_context()
context._push_message_depth(True)
element._consistency(recalculate=True)
context._pop_message_depth()
# We'll appear as a skipped element if tracking resulted in no change
return changed
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