Don't always derefence ref

ugit/base.py

@@ -161,7 +161,7 @@ def get_oid(name):
         f"refs/heads/{name}",
     ]
     for ref in refs_to_try:
-        if data.get_ref(ref).value:
+        if data.get_ref(ref, deref=False).value:
             return data.get_ref(ref).value
 
     # Name is SHA1

ugit/cli.py

@@ -121,10 +121,11 @@ def k(args):
     dot = "digraph commits {\n"
 
     oids = set()
-    for refname, ref in data.iter_refs():
+    for refname, ref in data.iter_refs(deref=False):
         dot += f"'{refname}' [shape=note]\n"
         dot += f"'{refname}' -> '{ref.value}'\n"
-        oids.add(ref.value)
+        if not ref.symbolic:
+            oids.add(ref.value)
 
     for oid in base.iter_commits_and_parents(oids):
         commit = base.get_commit(oid)

ugit/data.py

@@ -16,9 +16,9 @@ def init():
 RefValue = namedtuple("RefValue", ["symbolic", "value"])
 
 
-def update_ref(ref, value):
+def update_ref(ref, value, deref=True):
     assert not value.symbolic
-    ref = _get_ref_internal(ref)[0]
+    ref = _get_ref_internal(ref, deref)[0]
     ref_path = f"{GIT_DIR}/{ref}"
     Path.mkdir(ref_path, exist_ok=True)
     with open(ref_path, "w") as f: