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#include "cache.h" #include "sha1-lookup.h" #include "refs.h" static struct replace_object { unsigned char sha1[2][20]; } **replace_object; static int replace_object_alloc, replace_object_nr; static const unsigned char *replace_sha1_access(size_t index, void *table) { struct replace_object **replace = table; return replace[index]->sha1[0]; } static int replace_object_pos(const unsigned char *sha1) { return sha1_pos(sha1, replace_object, replace_object_nr, replace_sha1_access); } static int register_replace_object(struct replace_object *replace, int ignore_dups) { int pos = replace_object_pos(replace->sha1[0]); if (0 <= pos) { if (ignore_dups) free(replace); else { free(replace_object[pos]); replace_object[pos] = replace; } return 1; } pos = -pos - 1; if (replace_object_alloc <= ++replace_object_nr) { replace_object_alloc = alloc_nr(replace_object_alloc); replace_object = xrealloc(replace_object, sizeof(*replace_object) * replace_object_alloc); } if (pos < replace_object_nr) memmove(replace_object + pos + 1, replace_object + pos, (replace_object_nr - pos - 1) * sizeof(*replace_object)); replace_object[pos] = replace; return 0; } static int register_replace_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) { /* Get sha1 from refname */ const char *slash = strrchr(refname, '/'); const char *hash = slash ? slash + 1 : refname; struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj)); if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->sha1[0])) { free(repl_obj); warning("bad replace ref name: %s", refname); return 0; } /* Copy sha1 from the read ref */ hashcpy(repl_obj->sha1[1], sha1); /* Register new object */ if (register_replace_object(repl_obj, 1)) die("duplicate replace ref: %s", refname); return 0; } static void prepare_replace_object(void) { static int replace_object_prepared; if (replace_object_prepared) return; for_each_replace_ref(register_replace_ref, NULL); replace_object_prepared = 1; } /* We allow "recursive" replacement. Only within reason, though */ #define MAXREPLACEDEPTH 5 const unsigned char *lookup_replace_object(const unsigned char *sha1) { int pos, depth = MAXREPLACEDEPTH; const unsigned char *cur = sha1; if (!read_replace_refs) return sha1; prepare_replace_object(); /* Try to recursively replace the object */ do { if (--depth < 0) die("replace depth too high for object %s", sha1_to_hex(sha1)); pos = replace_object_pos(cur); if (0 <= pos) cur = replace_object[pos]->sha1[1]; } while (0 <= pos); return cur; }
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