Fix 500 error when attempting to update installed repository.

lib/galaxy/util/__init__.py

@@ -335,6 +335,17 @@ def shrink_string_by_size( value, size, join_by="..", left_larger=True, beginnin
     return value
 
 
+def parse_query_string( query_string ):
+    if '=' not in query_string:
+        return {}
+    retval = {}
+    arguments = query_string.split( '&' )
+    for argument in arguments:
+        key, value = argument.split( '=' )
+        retval[ key ] = value
+    return retval
+
+
 def pretty_print_time_interval( time=False, precise=False ):
     """
     Get a datetime object or a int() Epoch timestamp and return a

lib/galaxy/webapps/tool_shed/framework/middleware/hg.py

@@ -10,6 +10,7 @@ from paste.httpheaders import AUTH_TYPE
 from paste.httpheaders import REMOTE_USER
 
 from galaxy.util import asbool
+from galaxy.util import parse_query_string
 from galaxy.util.hash_util import new_secure_hash
 from tool_shed.util import hg_util
 from tool_shed.util import commit_util
@@ -49,11 +50,11 @@ class Hg( object ):
         # a clone or a pull.  However, we do not want to increment the times_downloaded count if we're only setting repository
         # metadata.
         if cmd == 'getbundle' and not self.setting_repository_metadata:
-            common, _ = environ[ 'HTTP_X_HGARG_1' ].split( '&' )
+            hg_args = parse_query_string( environ[ 'HTTP_X_HGARG_1' ] )
             # The 'common' parameter indicates the full sha-1 hash of the changeset the client currently has checked out. If
             # this is 0000000000000000000000000000000000000000, then the client is performing a fresh checkout. If it has any
             # other value, the client is getting updates to an existing checkout.
-            if common == 'common=0000000000000000000000000000000000000000':
+            if 'common' in hg_args and hg_args[ 'common' ] == '0000000000000000000000000000000000000000':
                 # Increment the value of the times_downloaded column in the repository table for the cloned repository.
                 if 'PATH_INFO' in environ:
                     # Instantiate a database connection