git-interface: Factor out configuration file parsing

Add a new module that automatically locates the configuration file and
provides methods to obtain the values of configuration options.

Use the new module instead of ConfigParser everywhere.
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

git-interface/config.py

+import configparser
+import os
+
+_parser = None
+
+
+def _get_parser():
+    global _parser
+
+    if not _parser:
+        _parser = configparser.RawConfigParser()
+        path = os.path.dirname(os.path.realpath(__file__)) + "/../conf/config"
+        _parser.read(path)
+
+    return _parser
+
+
+def get(section, option):
+    return _get_parser().get(section, option)
+
+
+def getboolean(section, option):
+    return _get_parser().getboolean(section, option)
+
+
+def getint(section, option):
+    return _get_parser().getint(section, option)

git-interface/db.py

-import configparser
 import mysql.connector
-import os
+
+import config
 
 
 class Connection:
     _conn = None
 
     def __init__(self):
-        config = configparser.RawConfigParser()
-        config.read(os.path.dirname(os.path.realpath(__file__)) + "/../conf/config")
-
         aur_db_host = config.get('database', 'host')
         aur_db_name = config.get('database', 'name')
         aur_db_user = config.get('database', 'user')

git-interface/git-auth.py

 #!/usr/bin/python3
 
-import configparser
 import shlex
-import os
 import re
 import sys
 
+import config
 import db
 
 
@@ -24,9 +23,6 @@ def format_command(env_vars, command, ssh_opts, ssh_key):
     return msg
 
 
-config = configparser.RawConfigParser()
-config.read(os.path.dirname(os.path.realpath(__file__)) + "/../conf/config")
-
 valid_keytypes = config.get('auth', 'valid-keytypes').split()
 username_regex = config.get('auth', 'username-regex')
 git_serve_cmd = config.get('auth', 'git-serve-cmd')

git-interface/git-serve.py

 #!/usr/bin/python3
 
-import configparser
 import os
 import re
 import shlex
 import sys
 
+import config
 import db
 
-config = configparser.RawConfigParser()
-config.read(os.path.dirname(os.path.realpath(__file__)) + "/../conf/config")
-
 repo_path = config.get('serve', 'repo-path')
 repo_regex = config.get('serve', 'repo-regex')
 git_shell_cmd = config.get('serve', 'git-shell-cmd')

git-interface/git-update.py

 #!/usr/bin/python3
 
-import configparser
 import os
 import pygit2
 import re
@@ -10,11 +9,9 @@ import sys
 import srcinfo.parse
 import srcinfo.utils
 
+import config
 import db
 
-config = configparser.RawConfigParser()
-config.read(os.path.dirname(os.path.realpath(__file__)) + "/../conf/config")
-
 notify_cmd = config.get('notifications', 'notify-cmd')
 
 repo_path = config.get('serve', 'repo-path')