6 struct replace_object {
7 struct oidmap_entry original;
8 struct object_id replacement;
11 static struct oidmap replace_map = OIDMAP_INIT;
13 static int register_replace_ref(const char *refname,
14 const struct object_id *oid,
15 int flag, void *cb_data)
17 /* Get sha1 from refname */
18 const char *slash = strrchr(refname, '/');
19 const char *hash = slash ? slash + 1 : refname;
20 struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
22 if (get_oid_hex(hash, &repl_obj->original.oid)) {
24 warning("bad replace ref name: %s", refname);
28 /* Copy sha1 from the read ref */
29 oidcpy(&repl_obj->replacement, oid);
31 /* Register new object */
32 if (oidmap_put(&replace_map, repl_obj))
33 die("duplicate replace ref: %s", refname);
38 static void prepare_replace_object(void)
40 static int replace_object_prepared;
42 if (replace_object_prepared)
45 for_each_replace_ref(register_replace_ref, NULL);
46 replace_object_prepared = 1;
47 if (!replace_map.map.tablesize)
48 check_replace_refs = 0;
51 /* We allow "recursive" replacement. Only within reason, though */
52 #define MAXREPLACEDEPTH 5
55 * If a replacement for object oid has been set up, return the
56 * replacement object's name (replaced recursively, if necessary).
57 * The return value is either oid or a pointer to a
58 * permanently-allocated value. This function always respects replace
59 * references, regardless of the value of check_replace_refs.
61 const struct object_id *do_lookup_replace_object(const struct object_id *oid)
63 int depth = MAXREPLACEDEPTH;
64 const struct object_id *cur = oid;
66 prepare_replace_object();
68 /* Try to recursively replace the object */
70 struct replace_object *repl_obj = oidmap_get(&replace_map, cur);
73 cur = &repl_obj->replacement;
75 die("replace depth too high for object %s", oid_to_hex(oid));