def remove_features_actions(prefix, index, features):
linked = install.linked(prefix)
r = Resolve(index)
actions = defaultdict(list)
actions[PREFIX] = prefix
_linked = [d + '.tar.bz2' for d in linked]
to_link = []
for dist in sorted(linked):
fn = dist + '.tar.bz2'
if fn not in index:
continue
if r.track_features(fn).intersection(features):
actions[UNLINK].append(dist)
if r.features(fn).intersection(features):
actions[UNLINK].append(dist)
subst = r.find_substitute(_linked, features, fn)
if subst:
to_link.append(subst[:-8])
if to_link:
actions.update(ensure_linked_actions(to_link, prefix))
return actions
