introduce notes-cache interface
[git/git.git] / notes-cache.c
CommitLineData
a941d5e3
JK
1#include "cache.h"
2#include "notes-cache.h"
3#include "commit.h"
4#include "refs.h"
5
6static int notes_cache_match_validity(const char *ref, const char *validity)
7{
8 unsigned char sha1[20];
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, sha1) < 0)
15 return 0;
16
17 commit = lookup_commit_reference_gently(sha1, 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
31void notes_cache_init(struct notes_cache *c, const char *name,
32 const char *validity)
33{
34 struct strbuf ref = STRBUF_INIT;
35 int flags = 0;
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
47int notes_cache_write(struct notes_cache *c)
48{
49 unsigned char tree_sha1[20];
50 unsigned char commit_sha1[20];
51
52 if (!c || !c->tree.initialized || !c->tree.ref || !*c->tree.ref)
53 return -1;
54 if (!c->tree.dirty)
55 return 0;
56
57 if (write_notes_tree(&c->tree, tree_sha1))
58 return -1;
59 if (commit_tree(c->validity, tree_sha1, NULL, commit_sha1, NULL) < 0)
60 return -1;
61 if (update_ref("update notes cache", c->tree.ref, commit_sha1, NULL,
62 0, QUIET_ON_ERR) < 0)
63 return -1;
64
65 return 0;
66}
67
68char *notes_cache_get(struct notes_cache *c, unsigned char key_sha1[20],
69 size_t *outsize)
70{
71 const unsigned char *value_sha1;
72 enum object_type type;
73 char *value;
74 unsigned long size;
75
76 value_sha1 = get_note(&c->tree, key_sha1);
77 if (!value_sha1)
78 return NULL;
79 value = read_sha1_file(value_sha1, &type, &size);
80
81 *outsize = size;
82 return value;
83}
84
85int notes_cache_put(struct notes_cache *c, unsigned char key_sha1[20],
86 const char *data, size_t size)
87{
88 unsigned char value_sha1[20];
89
90 if (write_sha1_file(data, size, "blob", value_sha1) < 0)
91 return -1;
92 add_note(&c->tree, key_sha1, value_sha1, NULL);
93 return 0;
94}