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-rw-r--r--builtin-diff-tree.c5
-rw-r--r--object.h13
2 files changed, 15 insertions, 3 deletions
diff --git a/builtin-diff-tree.c b/builtin-diff-tree.c
index 1138c2da7..8ecefd4f0 100644
--- a/builtin-diff-tree.c
+++ b/builtin-diff-tree.c
@@ -71,8 +71,9 @@ static int diff_tree_stdin(char *line)
line[len-1] = 0;
if (get_sha1_hex(line, sha1))
return -1;
- obj = lookup_object(sha1);
- obj = obj ? obj : parse_object(sha1);
+ obj = lookup_unknown_object(sha1);
+ if (!obj || !obj->parsed)
+ obj = parse_object(sha1);
if (!obj)
return -1;
if (obj->type == OBJ_COMMIT)
diff --git a/object.h b/object.h
index 036bd66fe..d962ff11d 100644
--- a/object.h
+++ b/object.h
@@ -41,7 +41,18 @@ extern int type_from_string(const char *str);
extern unsigned int get_max_object_index(void);
extern struct object *get_indexed_object(unsigned int);
-/** Internal only **/
+/*
+ * This can be used to see if we have heard of the object before, but
+ * it can return "yes we have, and here is a half-initialised object"
+ * for an object that we haven't loaded/parsed yet.
+ *
+ * When parsing a commit to create an in-core commit object, its
+ * parents list holds commit objects that represent its parents, but
+ * they are expected to be lazily initialized and do not know what
+ * their trees or parents are yet. When this function returns such a
+ * half-initialised objects, the caller is expected to initialize them
+ * by calling parse_object() on them.
+ */
struct object *lookup_object(const unsigned char *sha1);
extern void *create_object(const unsigned char *sha1, int type, void *obj);