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#!/usr/bin/python -S
#
# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
# pylint: disable-msg=W0403
"""Update stacked_on_location for all Bazaar branches.
Expects standard input of:
'<id> <branch_type> <unique_name> <stacked_on_unique_name>\n'.
Such input can be provided using "get-stacked-on-branches.py".
This script makes the stacked_on_location variables in all Bazaar branches
match the stacked_on column in the Launchpad database. This is useful for
updating stacked branches when their stacked-on branch has been moved or
renamed.
"""
__metaclass__ = type
import _pythonpath
import sys
from bzrlib.bzrdir import BzrDir
from bzrlib.config import TransportConfig
from bzrlib import errors
from lp.codehosting.vfs import get_rw_server, get_ro_server
from lp.codehosting.bzrutils import get_branch_stacked_on_url
from lp.services.scripts.base import LaunchpadScript
def set_branch_stacked_on_url(bzrdir, stacked_on_url):
"""Set the stacked_on_location for the branch at 'bzrdir'.
We cannot use Branch.set_stacked_on, since that requires us to first open
the branch. Opening the branch requires a working stacked_on_url:
something we don't yet have.
"""
branch_transport = bzrdir.get_branch_transport(None)
branch_config = TransportConfig(branch_transport, 'branch.conf')
stacked_on_url = branch_config.set_option(
stacked_on_url, 'stacked_on_location')
class UpdateStackedBranches(LaunchpadScript):
"""Update stacked branches so their stacked_on_location matches the db."""
def __init__(self):
super(UpdateStackedBranches, self).__init__('update-stacked-on')
def add_my_options(self):
self.parser.add_option(
'-n', '--dry-run', default=False, action="store_true",
dest="dry_run",
help=("Don't change anything on disk, just go through the "
"motions."))
def main(self):
if self.options.dry_run:
server = get_ro_server()
else:
server = get_rw_server()
server.start_server()
if self.options.dry_run:
self.logger.debug('Running read-only')
self.logger.debug('Beginning processing')
try:
self.updateBranches(self.parseFromStream(sys.stdin))
finally:
server.stop_server()
self.logger.info('Done')
def updateStackedOn(self, branch_id, bzr_branch_url, stacked_on_location):
"""Stack the Bazaar branch at 'bzr_branch_url' on the given URL.
:param branch_id: The database ID of the branch. This is only used for
logging.
:param bzr_branch_url: The lp-internal:/// URL of the Bazaar branch.
:param stacked_on_location: The location to store in the branch's
stacked_on_location configuration variable.
"""
try:
bzrdir = BzrDir.open(bzr_branch_url)
except errors.NotBranchError:
self.logger.warn(
"No bzrdir for %r at %r" % (branch_id, bzr_branch_url))
return
try:
current_stacked_on_location = get_branch_stacked_on_url(bzrdir)
except errors.NotBranchError:
self.logger.warn(
"No branch for %r at %r" % (branch_id, bzr_branch_url))
except errors.NotStacked:
self.logger.warn(
"Branch for %r at %r is not stacked at all. Giving up."
% (branch_id, bzr_branch_url))
except errors.UnstackableBranchFormat:
self.logger.error(
"Branch for %r at %r is unstackable. Giving up."
% (branch_id, bzr_branch_url))
else:
if current_stacked_on_location != stacked_on_location:
self.logger.info(
'Branch for %r at %r stacked on %r, should be on %r.'
% (branch_id, bzr_branch_url, current_stacked_on_location,
stacked_on_location))
if not self.options.dry_run:
set_branch_stacked_on_url(bzrdir, stacked_on_location)
def parseFromStream(self, stream):
"""Parse branch input from the given stream.
Expects the stream to be populated only by blank lines or by lines
with whitespace-separated fields. Such lines are yielded as tuples.
Blank lines are ignored.
"""
for line in stream.readlines():
if not line.strip():
continue
yield line.split()
def updateBranches(self, branches):
"""Update the stacked_on_location for all branches in 'branches'.
:param branches: An iterator yielding (branch_id, branch_type,
unique_name, stacked_on_unique_name).
"""
for branch_info in branches:
(branch_id, branch_type, unique_name,
stacked_on_name) = branch_info
stacked_on_location = '/' + stacked_on_name
self.updateStackedOn(
branch_id, 'lp-internal:///' + unique_name,
stacked_on_location)
if __name__ == '__main__':
UpdateStackedBranches().lock_and_run()
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