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# Copyright (C) 2009 W. Trevor King <wking@drexel.edu>
#
# 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.
"""
Handle conversion between the various on-disk images.
"""
import os, os.path
import sys
import doctest
import encoding
import mapfile
import rcs
# a list of all past versions
BUGDIR_DISK_VERSIONS = ["Bugs Everywhere Tree 1 0",
"Bugs Everywhere Directory v1.1"]
# the current version
BUGDIR_DISK_VERSION = BUGDIR_DISK_VERSIONS[-1]
class Upgrader (object):
"Class for converting "
initial_version = None
final_version = None
def __init__(self, root):
self.root = root
# use the "None" RCS to ensure proper encoding/decoding and
# simplify path construction.
self.rcs = rcs.rcs_by_name("None")
self.rcs.root(self.root)
self.rcs.encoding = encoding.get_encoding()
def get_path(self, *args):
"""
Return a path relative to .root.
"""
dir = os.path.join(self.root, ".be")
if len(args) == 0:
return dir
assert args[0] in ["version", "settings", "bugs"], str(args)
return os.path.join(dir, *args)
def check_initial_version(self):
path = self.get_path("version")
version = self.rcs.get_file_contents(path).rstrip("\n")
assert version == self.initial_version, version
def set_version(self):
path = self.get_path("version")
self.rcs.set_file_contents(path, self.final_version+"\n")
def upgrade(self):
print >> sys.stderr, "upgrading bugdir from '%s' to '%s'" \
% (self.initial_version, self.final_version)
self.check_initial_version()
self.set_version()
self._upgrade()
def _upgrade(self):
raise NotImplementedError
class Upgrade_1_0_to_2 (Upgrader):
initial_version = "Bugs Everywhere Tree 1 0"
final_version = "Bugs Everywhere Directory v2"
def _upgrade_mapfile(self, path):
contents = self.rcs.get_file_contents(path)
old_format = False
for line in contents.splitlines():
if len(line.split("=")) == 2:
old_format = True
break
if old_format == True:
# translate to YAML.
newlines = []
for line in contents.splitlines():
line = line.rstrip('\n')
if len(line) == 0:
continue
fields = line.split("=")
if len(fields) == 2:
key,value = fields
newlines.append('%s: "%s"' % (key, value.replace('"','\\"')))
else:
newlines.append(line)
contents = '\n'.join(newlines)
# load the YAML and save
map = mapfile.parse(contents)
mapfile.map_save(self.rcs, path, map)
def _upgrade(self):
"""
Comment value field "From" -> "Author".
Homegrown mapfile -> YAML.
"""
path = self.get_path("settings")
self._upgrade_mapfile(path)
for bug_uuid in os.listdir(self.get_path("bugs")):
path = self.get_path("bugs", bug_uuid, "values")
self._upgrade_mapfile(path)
c_path = ["bugs", bug_uuid, "comments"]
if not os.path.exists(self.get_path(*c_path)):
continue # no comments for this bug
for comment_uuid in os.listdir(self.get_path(*c_path)):
path_list = c_path + [comment_uuid, "values"]
path = self.get_path(*path_list)
self._upgrade_mapfile(path)
settings = mapfile.map_load(self.rcs, path)
if "From" in settings:
settings["Author"] = settings.pop("From")
mapfile.map_save(self.rcs, path, settings)
upgraders = [Upgrade_1_0_to_2]
upgrade_classes = {}
for upgrader in upgraders:
upgrade_classes[(upgrader.initial_version,upgrader.final_version)]=upgrader
def upgrade(path, current_version,
target_version=BUGDIR_DISK_VERSION):
"""
Call the appropriate upgrade function to convert current_version
to target_version. If a direct conversion function does not exist,
use consecutive conversion functions.
"""
if current_version not in BUGDIR_DISK_VERSIONS:
raise NotImplementedError, \
"Cannot handle version '%s' yet." % version
if target_version not in BUGDIR_DISK_VERSIONS:
raise NotImplementedError, \
"Cannot handle version '%s' yet." % version
if (current_version, target_version) in upgrade_classes:
# direct conversion
upgrade_class = upgrade_classes[(current_version, target_version)]
u = upgrade_class(path)
u.upgrade()
else:
# consecutive single-step conversion
i = BUGDIR_DISK_VERSIONS.index(current_version)
while True:
version_a = BUGDIR_DISK_VERSIONS[i]
version_b = BUGDIR_DISK_VERSIONS[i+1]
try:
upgrade_class = upgrade_classes[(version_a, version_b)]
except KeyError:
raise NotImplementedError, \
"Cannot convert version '%s' to '%s' yet." \
% (version_a, version_b)
u = upgrade_class(path)
u.upgrade()
if version_b == target_version:
break
i += 1
suite = doctest.DocTestSuite()
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