7d282df06972c57cc028ea7f6a8ef9c0e77df149
[git/git.git] / tag.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "object-store.h"
4 #include "commit.h"
5 #include "tree.h"
6 #include "blob.h"
7 #include "alloc.h"
8 #include "gpg-interface.h"
9
10 const char *tag_type = "tag";
11
12 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
13 {
14 struct signature_check sigc;
15 size_t payload_size;
16 int ret;
17
18 memset(&sigc, 0, sizeof(sigc));
19
20 payload_size = parse_signature(buf, size);
21
22 if (size == payload_size) {
23 if (flags & GPG_VERIFY_VERBOSE)
24 write_in_full(1, buf, payload_size);
25 return error("no signature found");
26 }
27
28 ret = check_signature(buf, payload_size, buf + payload_size,
29 size - payload_size, &sigc);
30
31 if (!(flags & GPG_VERIFY_OMIT_STATUS))
32 print_signature_buffer(&sigc, flags);
33
34 signature_check_clear(&sigc);
35 return ret;
36 }
37
38 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
39 unsigned flags)
40 {
41 enum object_type type;
42 char *buf;
43 unsigned long size;
44 int ret;
45
46 type = oid_object_info(the_repository, oid, NULL);
47 if (type != OBJ_TAG)
48 return error("%s: cannot verify a non-tag object of type %s.",
49 name_to_report ?
50 name_to_report :
51 find_unique_abbrev(oid, DEFAULT_ABBREV),
52 type_name(type));
53
54 buf = read_object_file(oid, &type, &size);
55 if (!buf)
56 return error("%s: unable to read file.",
57 name_to_report ?
58 name_to_report :
59 find_unique_abbrev(oid, DEFAULT_ABBREV));
60
61 ret = run_gpg_verify(buf, size, flags);
62
63 free(buf);
64 return ret;
65 }
66
67 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
68 {
69 while (o && o->type == OBJ_TAG)
70 if (((struct tag *)o)->tagged)
71 o = parse_object(the_repository,
72 &((struct tag *)o)->tagged->oid);
73 else
74 o = NULL;
75 if (!o && warn) {
76 if (!warnlen)
77 warnlen = strlen(warn);
78 error("missing object referenced by '%.*s'", warnlen, warn);
79 }
80 return o;
81 }
82
83 struct object *deref_tag_noverify(struct object *o)
84 {
85 while (o && o->type == OBJ_TAG) {
86 o = parse_object(the_repository, &o->oid);
87 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
88 o = ((struct tag *)o)->tagged;
89 else
90 o = NULL;
91 }
92 return o;
93 }
94
95 struct tag *lookup_tag(const struct object_id *oid)
96 {
97 struct object *obj = lookup_object(oid->hash);
98 if (!obj)
99 return create_object(the_repository, oid->hash,
100 alloc_tag_node(the_repository));
101 return object_as_type(obj, OBJ_TAG, 0);
102 }
103
104 static timestamp_t parse_tag_date(const char *buf, const char *tail)
105 {
106 const char *dateptr;
107
108 while (buf < tail && *buf++ != '>')
109 /* nada */;
110 if (buf >= tail)
111 return 0;
112 dateptr = buf;
113 while (buf < tail && *buf++ != '\n')
114 /* nada */;
115 if (buf >= tail)
116 return 0;
117 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
118 return parse_timestamp(dateptr, NULL, 10);
119 }
120
121 void release_tag_memory(struct tag *t)
122 {
123 free(t->tag);
124 t->tagged = NULL;
125 t->object.parsed = 0;
126 t->date = 0;
127 }
128
129 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
130 {
131 struct object_id oid;
132 char type[20];
133 const char *bufptr = data;
134 const char *tail = bufptr + size;
135 const char *nl;
136
137 if (item->object.parsed)
138 return 0;
139 item->object.parsed = 1;
140
141 if (size < GIT_SHA1_HEXSZ + 24)
142 return -1;
143 if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
144 return -1;
145
146 if (!starts_with(bufptr, "type "))
147 return -1;
148 bufptr += 5;
149 nl = memchr(bufptr, '\n', tail - bufptr);
150 if (!nl || sizeof(type) <= (nl - bufptr))
151 return -1;
152 memcpy(type, bufptr, nl - bufptr);
153 type[nl - bufptr] = '\0';
154 bufptr = nl + 1;
155
156 if (!strcmp(type, blob_type)) {
157 item->tagged = (struct object *)lookup_blob(&oid);
158 } else if (!strcmp(type, tree_type)) {
159 item->tagged = (struct object *)lookup_tree(&oid);
160 } else if (!strcmp(type, commit_type)) {
161 item->tagged = (struct object *)lookup_commit(&oid);
162 } else if (!strcmp(type, tag_type)) {
163 item->tagged = (struct object *)lookup_tag(&oid);
164 } else {
165 error("Unknown type %s", type);
166 item->tagged = NULL;
167 }
168
169 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
170 ; /* good */
171 else
172 return -1;
173 bufptr += 4;
174 nl = memchr(bufptr, '\n', tail - bufptr);
175 if (!nl)
176 return -1;
177 item->tag = xmemdupz(bufptr, nl - bufptr);
178 bufptr = nl + 1;
179
180 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
181 item->date = parse_tag_date(bufptr, tail);
182 else
183 item->date = 0;
184
185 return 0;
186 }
187
188 int parse_tag(struct tag *item)
189 {
190 enum object_type type;
191 void *data;
192 unsigned long size;
193 int ret;
194
195 if (item->object.parsed)
196 return 0;
197 data = read_object_file(&item->object.oid, &type, &size);
198 if (!data)
199 return error("Could not read %s",
200 oid_to_hex(&item->object.oid));
201 if (type != OBJ_TAG) {
202 free(data);
203 return error("Object %s not a tag",
204 oid_to_hex(&item->object.oid));
205 }
206 ret = parse_tag_buffer(item, data, size);
207 free(data);
208 return ret;
209 }