notes-cache.c

   1 #include "cache.h"
   2 #include "notes-cache.h"
   3 #include "object-store.h"
   4 #include "repository.h"
   5 #include "commit.h"
   6 #include "refs.h"
   7
   8 static int notes_cache_match_validity(const char *ref, const char *validity)
   9 {
  10         struct object_id oid;
  11         struct commit *commit;
  12         struct pretty_print_context pretty_ctx;
  13         struct strbuf msg = STRBUF_INIT;
  14         int ret;
  15
  16         if (read_ref(ref, &oid) < 0)
  17                 return 0;
  18
  19         commit = lookup_commit_reference_gently(the_repository, &oid, 1);
  20         if (!commit)
  21                 return 0;
  22
  23         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
  24         format_commit_message(commit, "%s", &msg, &pretty_ctx);
  25         strbuf_trim(&msg);
  26
  27         ret = !strcmp(msg.buf, validity);
  28         strbuf_release(&msg);
  29
  30         return ret;
  31 }
  32
  33 void notes_cache_init(struct notes_cache *c, const char *name,
  34                      const char *validity)
  35 {
  36         struct strbuf ref = STRBUF_INIT;
  37         int flags = NOTES_INIT_WRITABLE;
  38
  39         memset(c, 0, sizeof(*c));
  40         c->validity = xstrdup(validity);
  41
  42         strbuf_addf(&ref, "refs/notes/%s", name);
  43         if (!notes_cache_match_validity(ref.buf, validity))
  44                 flags |= NOTES_INIT_EMPTY;
  45         init_notes(&c->tree, ref.buf, combine_notes_overwrite, flags);
  46         strbuf_release(&ref);
  47 }
  48
  49 int notes_cache_write(struct notes_cache *c)
  50 {
  51         struct object_id tree_oid, commit_oid;
  52
  53         if (!c || !c->tree.initialized || !c->tree.update_ref ||
  54             !*c->tree.update_ref)
  55                 return -1;
  56         if (!c->tree.dirty)
  57                 return 0;
  58
  59         if (write_notes_tree(&c->tree, &tree_oid))
  60                 return -1;
  61         if (commit_tree(c->validity, strlen(c->validity), &tree_oid, NULL,
  62                         &commit_oid, NULL, NULL) < 0)
  63                 return -1;
  64         if (update_ref("update notes cache", c->tree.update_ref, &commit_oid,
  65                        NULL, 0, UPDATE_REFS_QUIET_ON_ERR) < 0)
  66                 return -1;
  67
  68         return 0;
  69 }
  70
  71 char *notes_cache_get(struct notes_cache *c, struct object_id *key_oid,
  72                       size_t *outsize)
  73 {
  74         const struct object_id *value_oid;
  75         enum object_type type;
  76         char *value;
  77         unsigned long size;
  78
  79         value_oid = get_note(&c->tree, key_oid);
  80         if (!value_oid)
  81                 return NULL;
  82         value = read_object_file(value_oid, &type, &size);
  83
  84         *outsize = size;
  85         return value;
  86 }
  87
  88 int notes_cache_put(struct notes_cache *c, struct object_id *key_oid,
  89                     const char *data, size_t size)
  90 {
  91         struct object_id value_oid;
  92
  93         if (write_object_file(data, size, "blob", &value_oid) < 0)
  94                 return -1;
  95         return add_note(&c->tree, key_oid, &value_oid, NULL);
  96 }