Comment 10 for bug 1311056

This might be enough to fix it - I just compare the values against each other rather than doing 4 explicit cases. I call bool() on them first before comparing them as we want a boolean comparison here, and that should work even if you pass None or "" or whatever I guess.

diff --git a/aptsources/sourceslist.py b/aptsources/sourceslist.py
index 89cef642..d4e52c4d 100644
--- a/aptsources/sourceslist.py
+++ b/aptsources/sourceslist.py
@@ -332,10 +332,10 @@ class SourcesList(object):
         for source in sources:
             # if there is a repo with the same (type, uri, dist) just add the
             # components
- if source.disabled and set(source.comps) == set(comps):
- source.disabled = False
+ if bool(source.disabled) != bool(disabled) and set(source.comps) == set(comps):
+ source.disabled = bool(disabled)
                 return source
- elif not source.disabled:
+ elif bool(disabled) == bool(source.disabled):
                 source.comps = uniq(source.comps + comps)
                 return source
         # there isn't any matching source, so create a new line and parse it