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# Copyright (C) 2008 Canonical Ltd
#
# 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, see <http://www.gnu.org/licenses/>.
"""Routines for saving and loading the id-map file."""
import os
def save_id_map(filename, revision_ids):
"""Save the mapping of commit ids to revision ids to a file.
Throws the usual exceptions if the file cannot be opened,
written to or closed.
:param filename: name of the file to save the data to
:param revision_ids: a dictionary of commit ids to revision ids.
"""
f = open(filename, 'wb')
try:
for commit_id, rev_id in revision_ids.iteritems():
f.write("%s %s\n" % (commit_id, rev_id))
f.flush()
finally:
f.close()
def load_id_map(filename):
"""Load the mapping of commit ids to revision ids from a file.
If the file does not exist, an empty result is returned.
If the file does exists but cannot be opened, read or closed,
the normal exceptions are thrown.
NOTE: It is assumed that commit-ids do not have embedded spaces.
:param filename: name of the file to save the data to
:result: map, count where:
map = a dictionary of commit ids to revision ids;
count = the number of keys in map
"""
result = {}
count = 0
if os.path.exists(filename):
f = open(filename)
try:
for line in f:
parts = line[:-1].split(' ', 1)
result[parts[0]] = parts[1]
count += 1
finally:
f.close()
return result, count
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