Fourth batch
[git.git] / tag.c
blob1ed2684e45bd50d051ade60cc6b66c8c44fbed59
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 #include "packfile.h"
11 const char *tag_type = "tag";
13 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
15 struct signature_check sigc;
16 size_t payload_size;
17 int ret;
19 memset(&sigc, 0, sizeof(sigc));
21 payload_size = parse_signature(buf, size);
23 if (size == payload_size) {
24 if (flags & GPG_VERIFY_VERBOSE)
25 write_in_full(1, buf, payload_size);
26 return error("no signature found");
29 ret = check_signature(buf, payload_size, buf + payload_size,
30 size - payload_size, &sigc);
32 if (!(flags & GPG_VERIFY_OMIT_STATUS))
33 print_signature_buffer(&sigc, flags);
35 signature_check_clear(&sigc);
36 return ret;
39 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
40 unsigned flags)
42 enum object_type type;
43 char *buf;
44 unsigned long size;
45 int ret;
47 type = oid_object_info(the_repository, oid, NULL);
48 if (type != OBJ_TAG)
49 return error("%s: cannot verify a non-tag object of type %s.",
50 name_to_report ?
51 name_to_report :
52 find_unique_abbrev(oid, DEFAULT_ABBREV),
53 type_name(type));
55 buf = read_object_file(oid, &type, &size);
56 if (!buf)
57 return error("%s: unable to read file.",
58 name_to_report ?
59 name_to_report :
60 find_unique_abbrev(oid, DEFAULT_ABBREV));
62 ret = run_gpg_verify(buf, size, flags);
64 free(buf);
65 return ret;
68 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
70 struct object_id *last_oid = NULL;
71 while (o && o->type == OBJ_TAG)
72 if (((struct tag *)o)->tagged) {
73 last_oid = &((struct tag *)o)->tagged->oid;
74 o = parse_object(r, last_oid);
75 } else {
76 last_oid = NULL;
77 o = NULL;
79 if (!o && warn) {
80 if (last_oid && is_promisor_object(last_oid))
81 return NULL;
82 if (!warnlen)
83 warnlen = strlen(warn);
84 error("missing object referenced by '%.*s'", warnlen, warn);
86 return o;
89 struct object *deref_tag_noverify(struct object *o)
91 while (o && o->type == OBJ_TAG) {
92 o = parse_object(the_repository, &o->oid);
93 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
94 o = ((struct tag *)o)->tagged;
95 else
96 o = NULL;
98 return o;
101 struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
103 struct object *obj = lookup_object(r, oid);
104 if (!obj)
105 return create_object(r, oid, alloc_tag_node(r));
106 return object_as_type(obj, OBJ_TAG, 0);
109 static timestamp_t parse_tag_date(const char *buf, const char *tail)
111 const char *dateptr;
113 while (buf < tail && *buf++ != '>')
114 /* nada */;
115 if (buf >= tail)
116 return 0;
117 dateptr = buf;
118 while (buf < tail && *buf++ != '\n')
119 /* nada */;
120 if (buf >= tail)
121 return 0;
122 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
123 return parse_timestamp(dateptr, NULL, 10);
126 void release_tag_memory(struct tag *t)
128 free(t->tag);
129 t->tagged = NULL;
130 t->object.parsed = 0;
131 t->date = 0;
134 int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
136 struct object_id oid;
137 char type[20];
138 const char *bufptr = data;
139 const char *tail = bufptr + size;
140 const char *nl;
142 if (item->object.parsed)
143 return 0;
145 if (item->tag) {
147 * Presumably left over from a previous failed parse;
148 * clear it out in preparation for re-parsing (we'll probably
149 * hit the same error, which lets us tell our current caller
150 * about the problem).
152 FREE_AND_NULL(item->tag);
155 if (size < the_hash_algo->hexsz + 24)
156 return -1;
157 if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
158 return -1;
160 if (!starts_with(bufptr, "type "))
161 return -1;
162 bufptr += 5;
163 nl = memchr(bufptr, '\n', tail - bufptr);
164 if (!nl || sizeof(type) <= (nl - bufptr))
165 return -1;
166 memcpy(type, bufptr, nl - bufptr);
167 type[nl - bufptr] = '\0';
168 bufptr = nl + 1;
170 if (!strcmp(type, blob_type)) {
171 item->tagged = (struct object *)lookup_blob(r, &oid);
172 } else if (!strcmp(type, tree_type)) {
173 item->tagged = (struct object *)lookup_tree(r, &oid);
174 } else if (!strcmp(type, commit_type)) {
175 item->tagged = (struct object *)lookup_commit(r, &oid);
176 } else if (!strcmp(type, tag_type)) {
177 item->tagged = (struct object *)lookup_tag(r, &oid);
178 } else {
179 return error("unknown tag type '%s' in %s",
180 type, oid_to_hex(&item->object.oid));
183 if (!item->tagged)
184 return error("bad tag pointer to %s in %s",
185 oid_to_hex(&oid),
186 oid_to_hex(&item->object.oid));
188 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
189 ; /* good */
190 else
191 return -1;
192 bufptr += 4;
193 nl = memchr(bufptr, '\n', tail - bufptr);
194 if (!nl)
195 return -1;
196 item->tag = xmemdupz(bufptr, nl - bufptr);
197 bufptr = nl + 1;
199 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
200 item->date = parse_tag_date(bufptr, tail);
201 else
202 item->date = 0;
204 item->object.parsed = 1;
205 return 0;
208 int parse_tag(struct tag *item)
210 enum object_type type;
211 void *data;
212 unsigned long size;
213 int ret;
215 if (item->object.parsed)
216 return 0;
217 data = read_object_file(&item->object.oid, &type, &size);
218 if (!data)
219 return error("Could not read %s",
220 oid_to_hex(&item->object.oid));
221 if (type != OBJ_TAG) {
222 free(data);
223 return error("Object %s not a tag",
224 oid_to_hex(&item->object.oid));
226 ret = parse_tag_buffer(the_repository, item, data, size);
227 free(data);
228 return ret;
231 struct object_id *get_tagged_oid(struct tag *tag)
233 if (!tag->tagged)
234 die("bad tag");
235 return &tag->tagged->oid;