notes-cache.c

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