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