notes-cache.c

   1 #include "git-compat-util.h"
   2 #include "notes-cache.h"
   3 #include "object-store-ll.h"
   4 #include "pretty.h"
   5 #include "repository.h"
   6 #include "commit.h"
   7 #include "refs.h"
   8 #include "strbuf.h"
   9
  10 static int notes_cache_match_validity(struct repository *r,
  11                                       const char *ref,
  12                                       const char *validity)
  13 {
  14         struct object_id oid;
  15         struct commit *commit;
  16         struct pretty_print_context pretty_ctx;
  17         struct strbuf msg = STRBUF_INIT;
  18         int ret;
  19
  20         if (read_ref(ref, &oid) < 0)
  21                 return 0;
  22
  23         commit = lookup_commit_reference_gently(r, &oid, 1);
  24         if (!commit)
  25                 return 0;
  26
  27         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
  28         repo_format_commit_message(r, commit, "%s", &msg,
  29                                    &pretty_ctx);
  30         strbuf_trim(&msg);
  31
  32         ret = !strcmp(msg.buf, validity);
  33         strbuf_release(&msg);
  34
  35         return ret;
  36 }
  37
  38 void notes_cache_init(struct repository *r, struct notes_cache *c,
  39                       const char *name, const char *validity)
  40 {
  41         struct strbuf ref = STRBUF_INIT;
  42         int flags = NOTES_INIT_WRITABLE;
  43
  44         memset(c, 0, sizeof(*c));
  45         c->validity = xstrdup(validity);
  46
  47         strbuf_addf(&ref, "refs/notes/%s", name);
  48         if (!notes_cache_match_validity(r, ref.buf, validity))
  49                 flags |= NOTES_INIT_EMPTY;
  50         init_notes(&c->tree, ref.buf, combine_notes_overwrite, flags);
  51         strbuf_release(&ref);
  52 }
  53
  54 int notes_cache_write(struct notes_cache *c)
  55 {
  56         struct object_id tree_oid, commit_oid;
  57
  58         if (!c || !c->tree.initialized || !c->tree.update_ref ||
  59             !*c->tree.update_ref)
  60                 return -1;
  61         if (!c->tree.dirty)
  62                 return 0;
  63
  64         if (write_notes_tree(&c->tree, &tree_oid))
  65                 return -1;
  66         if (commit_tree(c->validity, strlen(c->validity), &tree_oid, NULL,
  67                         &commit_oid, NULL, NULL) < 0)
  68                 return -1;
  69         if (update_ref("update notes cache", c->tree.update_ref, &commit_oid,
  70                        NULL, 0, UPDATE_REFS_QUIET_ON_ERR) < 0)
  71                 return -1;
  72
  73         return 0;
  74 }
  75
  76 char *notes_cache_get(struct notes_cache *c, struct object_id *key_oid,
  77                       size_t *outsize)
  78 {
  79         const struct object_id *value_oid;
  80         enum object_type type;
  81         char *value;
  82         unsigned long size;
  83
  84         value_oid = get_note(&c->tree, key_oid);
  85         if (!value_oid)
  86                 return NULL;
  87         value = repo_read_object_file(the_repository, value_oid, &type, &size);
  88
  89         *outsize = size;
  90         return value;
  91 }
  92
  93 int notes_cache_put(struct notes_cache *c, struct object_id *key_oid,
  94                     const char *data, size_t size)
  95 {
  96         struct object_id value_oid;
  97
  98         if (write_object_file(data, size, OBJ_BLOB, &value_oid) < 0)
  99                 return -1;
 100         return add_note(&c->tree, key_oid, &value_oid, NULL);
 101 }