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# Copyright (C) 2008 Lars Wirzenius <liw@iki.fi>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Operation to forget generations from backup store."""
import logging
import obnam
class Forget(obnam.Operation):
"""Forget specified generations."""
name = "forget"
def do_it(self, forgettable_ids):
logging.debug("Forgetting generations: %s" % " ".join(forgettable_ids))
logging.debug("forget: Loading and decoding host block")
app = self.get_application()
context = app.get_context()
host = app.load_host()
gen_ids = host.get_generation_ids()
map_block_ids = host.get_map_block_ids()
contmap_block_ids = host.get_contmap_block_ids()
app.load_maps()
app.load_content_maps()
logging.debug("forget: Forgetting each id")
for id in forgettable_ids:
if id in gen_ids:
gen_ids.remove(id)
else:
print "Warning: Generation", id, "is not known"
logging.debug("forget: Uploading new host block")
host_id = context.config.get("backup", "host-id")
host2 = obnam.obj.HostBlockObject(host_id=host_id, gen_ids=gen_ids,
map_block_ids=map_block_ids,
contmap_block_ids=contmap_block_ids)
block = host2.encode()
obnam.io.upload_host_block(context, block)
logging.debug("forget: Forgetting garbage")
obnam.io.collect_garbage(context, block)
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