spawn: expand AUR_CONFIG to the full path

This allows using a relative path for the config. PHP didn't play well
with it.
Signed-off-by: Filipe Laíns <lains@archlinux.org>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

aurweb/spawn.py

@@ -11,6 +11,7 @@ configuration anyway.
 import argparse
 import atexit
 import os
+import os.path
 import subprocess
 import sys
 import tempfile
@@ -87,6 +88,9 @@ def start():
         return
     atexit.register(stop)
 
+    if 'AUR_CONFIG' in os.environ:
+        os.environ['AUR_CONFIG'] = os.path.realpath(os.environ['AUR_CONFIG'])
+
     try:
         terminal_width = os.get_terminal_size().columns
     except OSError: