Enable connecting to a custom MusicBrainz server

Under the new [musicbrainz] section in the config,
you can set a server to connect to.

Closes #172.

README.md

@@ -166,6 +166,9 @@ The possible sections are:
 - Main section: `[main]`
   - `path_filter_fat`: whether to filter path components for FAT file systems
   - `path_filter_special`: whether to filter path components for special characters
+  
+- MusicBrainz section: `[musicbrainz]`
+  - `server`: the MusicBrainz server to connect to, in `host:[port]` format. Defaults to `musicbrainz.org`.
 
 - Drive section: `[drive:IDENTIFIER]`, one for each configured drive. All these values are probed by whipper and should not be edited by hand.
   - `defeats_cache`: whether this drive can defeat the audio cache

whipper/command/main.py

@@ -10,7 +10,7 @@ import whipper
 
 from whipper.command import cd, offset, drive, image, accurip, debug
 from whipper.command.basecommand import BaseCommand
-from whipper.common import common, directory
+from whipper.common import common, directory, config
 from whipper.extern.task import task
 from whipper.program.utils import eject_device
 
@@ -22,6 +22,7 @@ def main():
     # set user agent
     musicbrainzngs.set_useragent("whipper", whipper.__version__,
                                  "https://github.com/JoeLametta/whipper")
+    musicbrainzngs.set_hostname(config.Config().get_musicbrainz_server())
     # register plugins with pkg_resources
     distributions, _ = pkg_resources.working_set.find_plugins(
         pkg_resources.Environment([directory.data_path('plugins')])

whipper/common/config.py

@@ -21,9 +21,11 @@
 import ConfigParser
 import codecs
 import os.path
+import re
 import shutil
 import tempfile
 import urllib
+from urlparse import urlparse
 
 from whipper.common import directory
 
@@ -72,6 +74,13 @@ class Config:
     def getboolean(self, section, option):
         return self._getter('boolean', section, option)
 
+    # musicbrainz section
+
+    def get_musicbrainz_server(self):
+        server = self.get('musicbrainz', 'server') or 'musicbrainz.org'
+        server_url = server if re.match(r'^\D*//', server) else '//' + server
+        return urlparse(server_url).netloc
+
     # drive sections
 
     def setReadOffset(self, vendor, model, release, offset):

whipper/image/table.py

@@ -28,7 +28,7 @@ import urlparse
 
 import whipper
 
-from whipper.common import common
+from whipper.common import common, config
 
 import logging
 logger = logging.getLogger(__name__)
@@ -390,7 +390,7 @@ class Table(object):
         return result
 
     def getMusicBrainzSubmitURL(self):
-        host = 'musicbrainz.org'
+        host = config.Config().get_musicbrainz_server()
 
         discid = self.getMusicBrainzDiscId()
         values = self._getMusicBrainzValues()