Split GPG interface into its own helper library
[git/git.git] / tag.c
CommitLineData
2636f614 1#include "cache.h"
8f1d2e6f 2#include "tag.h"
0ab17950
NP
3#include "commit.h"
4#include "tree.h"
5#include "blob.h"
2636f614 6
ac58c4c7 7#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
3d5854e7 8#define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
ac58c4c7 9
2636f614
DB
10const char *tag_type = "tag";
11
9534f40b 12struct object *deref_tag(struct object *o, const char *warn, int warnlen)
37fde874 13{
1974632c 14 while (o && o->type == OBJ_TAG)
24e8a3c9
MK
15 if (((struct tag *)o)->tagged)
16 o = parse_object(((struct tag *)o)->tagged->sha1);
17 else
18 o = NULL;
9534f40b
JH
19 if (!o && warn) {
20 if (!warnlen)
21 warnlen = strlen(warn);
22 error("missing object referenced by '%.*s'", warnlen, warn);
23 }
37fde874
JH
24 return o;
25}
26
5d6ccf5c 27struct tag *lookup_tag(const unsigned char *sha1)
2636f614 28{
100c5f3b
LT
29 struct object *obj = lookup_object(sha1);
30 if (!obj)
31 return create_object(sha1, OBJ_TAG, alloc_tag_node());
d1af002d 32 if (!obj->type)
1974632c 33 obj->type = OBJ_TAG;
d2c030d4
JH
34 if (obj->type != OBJ_TAG) {
35 error("Object %s is a %s, not a tag",
36 sha1_to_hex(sha1), typename(obj->type));
37 return NULL;
38 }
39 return (struct tag *) obj;
2636f614
DB
40}
41
e451d06b
SP
42static unsigned long parse_tag_date(const char *buf, const char *tail)
43{
44 const char *dateptr;
45
46 while (buf < tail && *buf++ != '>')
47 /* nada */;
48 if (buf >= tail)
49 return 0;
50 dateptr = buf;
51 while (buf < tail && *buf++ != '\n')
52 /* nada */;
53 if (buf >= tail)
54 return 0;
55 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
56 return strtoul(dateptr, NULL, 10);
57}
58
cf7b1cad 59int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
2636f614 60{
0ab17950 61 unsigned char sha1[20];
89e4202f 62 char type[20];
28de5b6b
SP
63 const char *bufptr = data;
64 const char *tail = bufptr + size;
65 const char *nl;
ae200ee5 66
2e0052a5
SP
67 if (item->object.parsed)
68 return 0;
69 item->object.parsed = 1;
2636f614 70
2636f614 71 if (size < 64)
bd2c39f5 72 return -1;
28de5b6b 73 if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
bd2c39f5 74 return -1;
28de5b6b 75 bufptr += 48; /* "object " + sha1 + "\n" */
2636f614 76
28de5b6b 77 if (prefixcmp(bufptr, "type "))
bd2c39f5 78 return -1;
28de5b6b
SP
79 bufptr += 5;
80 nl = memchr(bufptr, '\n', tail - bufptr);
81 if (!nl || sizeof(type) <= (nl - bufptr))
bd2c39f5 82 return -1;
28de5b6b
SP
83 strncpy(type, bufptr, nl - bufptr);
84 type[nl - bufptr] = '\0';
85 bufptr = nl + 1;
2636f614 86
0ab17950
NP
87 if (!strcmp(type, blob_type)) {
88 item->tagged = &lookup_blob(sha1)->object;
89 } else if (!strcmp(type, tree_type)) {
90 item->tagged = &lookup_tree(sha1)->object;
91 } else if (!strcmp(type, commit_type)) {
92 item->tagged = &lookup_commit(sha1)->object;
93 } else if (!strcmp(type, tag_type)) {
94 item->tagged = &lookup_tag(sha1)->object;
95 } else {
96 error("Unknown type %s", type);
97 item->tagged = NULL;
98 }
99
85594252
NTND
100 if (bufptr + 4 < tail && !prefixcmp(bufptr, "tag "))
101 ; /* good */
102 else
28de5b6b
SP
103 return -1;
104 bufptr += 4;
105 nl = memchr(bufptr, '\n', tail - bufptr);
106 if (!nl)
107 return -1;
108 item->tag = xmemdupz(bufptr, nl - bufptr);
109 bufptr = nl + 1;
110
85594252 111 if (bufptr + 7 < tail && !prefixcmp(bufptr, "tagger "))
e451d06b
SP
112 item->date = parse_tag_date(bufptr, tail);
113 else
114 item->date = 0;
115
2636f614 116 return 0;
bd2c39f5 117}
13019d41 118
bd2c39f5
NP
119int parse_tag(struct tag *item)
120{
21666f1a 121 enum object_type type;
bd2c39f5
NP
122 void *data;
123 unsigned long size;
124 int ret;
125
126 if (item->object.parsed)
127 return 0;
21666f1a 128 data = read_sha1_file(item->object.sha1, &type, &size);
bd2c39f5
NP
129 if (!data)
130 return error("Could not read %s",
131 sha1_to_hex(item->object.sha1));
21666f1a 132 if (type != OBJ_TAG) {
bd2c39f5
NP
133 free(data);
134 return error("Object %s not a tag",
135 sha1_to_hex(item->object.sha1));
136 }
137 ret = parse_tag_buffer(item, data, size);
13019d41 138 free(data);
bd2c39f5 139 return ret;
2636f614 140}
ac58c4c7 141
2f47eae2
JH
142/*
143 * Look at a signed tag object, and return the offset where
144 * the embedded detached signature begins, or the end of the
145 * data when there is no such signature.
146 */
ac58c4c7
MG
147size_t parse_signature(const char *buf, unsigned long size)
148{
149 char *eol;
150 size_t len = 0;
3d5854e7
MG
151 while (len < size && prefixcmp(buf + len, PGP_SIGNATURE) &&
152 prefixcmp(buf + len, PGP_MESSAGE)) {
ac58c4c7
MG
153 eol = memchr(buf + len, '\n', size - len);
154 len += eol ? eol - (buf + len) + 1 : size - len;
155 }
156 return len;
157}