notes-cache.c

   1 #include "cache.h"
   2 #include "notes-cache.h"
   3 #include "commit.h"
   4 #include "refs.h"
   5
   6 static int notes_cache_match_validity(const char *ref, const char *validity)
   7 {
   8         struct object_id oid;
   9         struct commit *commit;
  10         struct pretty_print_context pretty_ctx;
  11         struct strbuf msg = STRBUF_INIT;
  12         int ret;
  13
  14         if (read_ref(ref, oid.hash) < 0)
  15                 return 0;
  16
  17         commit = lookup_commit_reference_gently(&oid, 1);
  18         if (!commit)
  19                 return 0;
  20
  21         memset(&pretty_ctx, 0, sizeof(pretty_ctx));
  22         format_commit_message(commit, "%s", &msg, &pretty_ctx);
  23         strbuf_trim(&msg);
  24
  25         ret = !strcmp(msg.buf, validity);
  26         strbuf_release(&msg);
  27
  28         return ret;
  29 }
  30
  31 void notes_cache_init(struct notes_cache *c, const char *name,
  32                      const char *validity)
  33 {
  34         struct strbuf ref = STRBUF_INIT;
  35         int flags = NOTES_INIT_WRITABLE;
  36
  37         memset(c, 0, sizeof(*c));
  38         c->validity = xstrdup(validity);
  39
  40         strbuf_addf(&ref, "refs/notes/%s", name);
  41         if (!notes_cache_match_validity(ref.buf, validity))
  42                 flags |= NOTES_INIT_EMPTY;
  43         init_notes(&c->tree, ref.buf, combine_notes_overwrite, flags);
  44         strbuf_release(&ref);
  45 }
  46
  47 int notes_cache_write(struct notes_cache *c)
  48 {
  49         struct object_id tree_oid, commit_oid;
  50
  51         if (!c || !c->tree.initialized || !c->tree.update_ref ||
  52             !*c->tree.update_ref)
  53                 return -1;
  54         if (!c->tree.dirty)
  55                 return 0;
  56
  57         if (write_notes_tree(&c->tree, tree_oid.hash))
  58                 return -1;
  59         if (commit_tree(c->validity, strlen(c->validity), tree_oid.hash, NULL,
  60                         commit_oid.hash, NULL, NULL) < 0)
  61                 return -1;
  62         if (update_ref("update notes cache", c->tree.update_ref, commit_oid.hash,
  63                        NULL, 0, UPDATE_REFS_QUIET_ON_ERR) < 0)
  64                 return -1;
  65
  66         return 0;
  67 }
  68
  69 char *notes_cache_get(struct notes_cache *c, struct object_id *key_oid,
  70                       size_t *outsize)
  71 {
  72         const unsigned char *value_sha1;
  73         enum object_type type;
  74         char *value;
  75         unsigned long size;
  76
  77         value_sha1 = get_note(&c->tree, key_oid->hash);
  78         if (!value_sha1)
  79                 return NULL;
  80         value = read_sha1_file(value_sha1, &type, &size);
  81
  82         *outsize = size;
  83         return value;
  84 }
  85
  86 int notes_cache_put(struct notes_cache *c, struct object_id *key_oid,
  87                     const char *data, size_t size)
  88 {
  89         struct object_id value_oid;
  90
  91         if (write_sha1_file(data, size, "blob", value_oid.hash) < 0)
  92                 return -1;
  93         return add_note(&c->tree, key_oid->hash, value_oid.hash, NULL);
  94 }