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# Copyright (C) 2009 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 reading/writing a marks file."""
from ...trace import warning
def import_marks(filename):
"""Read the mapping of marks to revision-ids from a file.
:param filename: the file to read from
:return: None if an error is encountered or a dictionary with marks
as keys and revision-ids as values
"""
# Check that the file is readable and in the right format
try:
f = open(filename, 'rb')
except IOError:
warning("Could not import marks file %s - not importing marks",
filename)
return None
try:
# Read the revision info
revision_ids = {}
line = f.readline()
if line == b'format=1\n':
# Cope with old-style marks files
# Read the branch info
branch_names = {}
for string in f.readline().rstrip(b'\n').split(b'\0'):
if not string:
continue
name, integer = string.rsplit(b'.', 1)
branch_names[name] = int(integer)
line = f.readline()
while line:
line = line.rstrip(b'\n')
mark, revid = line.split(b' ', 1)
mark = mark.lstrip(b':')
revision_ids[mark] = revid
line = f.readline()
finally:
f.close()
return revision_ids
def export_marks(filename, revision_ids):
"""Save marks to a file.
:param filename: filename to save data to
:param revision_ids: dictionary mapping marks -> bzr revision-ids
"""
try:
f = open(filename, 'wb')
except IOError:
warning("Could not open export-marks file %s - not exporting marks",
filename)
return
try:
# Write the revision info
for mark, revid in sorted(revision_ids.items()):
f.write(b':%s %s\n' % (mark.lstrip(b':'), revid))
finally:
f.close()
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