Merge branch 'sg/doc-trace-appends' into maint
[git] / 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 }