test-tool: don't force full index
[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 #include "packfile.h"
10
11 const char *tag_type = "tag";
12
13 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
14 {
15         struct signature_check sigc;
16         struct strbuf payload = STRBUF_INIT;
17         struct strbuf signature = STRBUF_INIT;
18         int ret;
19
20         memset(&sigc, 0, sizeof(sigc));
21
22         if (!parse_signature(buf, size, &payload, &signature)) {
23                 if (flags & GPG_VERIFY_VERBOSE)
24                         write_in_full(1, buf, size);
25                 return error("no signature found");
26         }
27
28         ret = check_signature(payload.buf, payload.len, signature.buf,
29                                 signature.len, &sigc);
30
31         if (!(flags & GPG_VERIFY_OMIT_STATUS))
32                 print_signature_buffer(&sigc, flags);
33
34         signature_check_clear(&sigc);
35         strbuf_release(&payload);
36         strbuf_release(&signature);
37         return ret;
38 }
39
40 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
41                 unsigned flags)
42 {
43         enum object_type type;
44         char *buf;
45         unsigned long size;
46         int ret;
47
48         type = oid_object_info(the_repository, oid, NULL);
49         if (type != OBJ_TAG)
50                 return error("%s: cannot verify a non-tag object of type %s.",
51                                 name_to_report ?
52                                 name_to_report :
53                                 find_unique_abbrev(oid, DEFAULT_ABBREV),
54                                 type_name(type));
55
56         buf = read_object_file(oid, &type, &size);
57         if (!buf)
58                 return error("%s: unable to read file.",
59                                 name_to_report ?
60                                 name_to_report :
61                                 find_unique_abbrev(oid, DEFAULT_ABBREV));
62
63         ret = run_gpg_verify(buf, size, flags);
64
65         free(buf);
66         return ret;
67 }
68
69 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
70 {
71         struct object_id *last_oid = NULL;
72         while (o && o->type == OBJ_TAG)
73                 if (((struct tag *)o)->tagged) {
74                         last_oid = &((struct tag *)o)->tagged->oid;
75                         o = parse_object(r, last_oid);
76                 } else {
77                         last_oid = NULL;
78                         o = NULL;
79                 }
80         if (!o && warn) {
81                 if (last_oid && is_promisor_object(last_oid))
82                         return NULL;
83                 if (!warnlen)
84                         warnlen = strlen(warn);
85                 error("missing object referenced by '%.*s'", warnlen, warn);
86         }
87         return o;
88 }
89
90 struct object *deref_tag_noverify(struct object *o)
91 {
92         while (o && o->type == OBJ_TAG) {
93                 o = parse_object(the_repository, &o->oid);
94                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
95                         o = ((struct tag *)o)->tagged;
96                 else
97                         o = NULL;
98         }
99         return o;
100 }
101
102 struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
103 {
104         struct object *obj = lookup_object(r, oid);
105         if (!obj)
106                 return create_object(r, oid, alloc_tag_node(r));
107         return object_as_type(obj, OBJ_TAG, 0);
108 }
109
110 static timestamp_t parse_tag_date(const char *buf, const char *tail)
111 {
112         const char *dateptr;
113
114         while (buf < tail && *buf++ != '>')
115                 /* nada */;
116         if (buf >= tail)
117                 return 0;
118         dateptr = buf;
119         while (buf < tail && *buf++ != '\n')
120                 /* nada */;
121         if (buf >= tail)
122                 return 0;
123         /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
124         return parse_timestamp(dateptr, NULL, 10);
125 }
126
127 void release_tag_memory(struct tag *t)
128 {
129         free(t->tag);
130         t->tagged = NULL;
131         t->object.parsed = 0;
132         t->date = 0;
133 }
134
135 int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
136 {
137         struct object_id oid;
138         char type[20];
139         const char *bufptr = data;
140         const char *tail = bufptr + size;
141         const char *nl;
142
143         if (item->object.parsed)
144                 return 0;
145
146         if (item->tag) {
147                 /*
148                  * Presumably left over from a previous failed parse;
149                  * clear it out in preparation for re-parsing (we'll probably
150                  * hit the same error, which lets us tell our current caller
151                  * about the problem).
152                  */
153                 FREE_AND_NULL(item->tag);
154         }
155
156         if (size < the_hash_algo->hexsz + 24)
157                 return -1;
158         if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
159                 return -1;
160
161         if (!starts_with(bufptr, "type "))
162                 return -1;
163         bufptr += 5;
164         nl = memchr(bufptr, '\n', tail - bufptr);
165         if (!nl || sizeof(type) <= (nl - bufptr))
166                 return -1;
167         memcpy(type, bufptr, nl - bufptr);
168         type[nl - bufptr] = '\0';
169         bufptr = nl + 1;
170
171         if (!strcmp(type, blob_type)) {
172                 item->tagged = (struct object *)lookup_blob(r, &oid);
173         } else if (!strcmp(type, tree_type)) {
174                 item->tagged = (struct object *)lookup_tree(r, &oid);
175         } else if (!strcmp(type, commit_type)) {
176                 item->tagged = (struct object *)lookup_commit(r, &oid);
177         } else if (!strcmp(type, tag_type)) {
178                 item->tagged = (struct object *)lookup_tag(r, &oid);
179         } else {
180                 return error("unknown tag type '%s' in %s",
181                              type, oid_to_hex(&item->object.oid));
182         }
183
184         if (!item->tagged)
185                 return error("bad tag pointer to %s in %s",
186                              oid_to_hex(&oid),
187                              oid_to_hex(&item->object.oid));
188
189         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
190                 ;               /* good */
191         else
192                 return -1;
193         bufptr += 4;
194         nl = memchr(bufptr, '\n', tail - bufptr);
195         if (!nl)
196                 return -1;
197         item->tag = xmemdupz(bufptr, nl - bufptr);
198         bufptr = nl + 1;
199
200         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
201                 item->date = parse_tag_date(bufptr, tail);
202         else
203                 item->date = 0;
204
205         item->object.parsed = 1;
206         return 0;
207 }
208
209 int parse_tag(struct tag *item)
210 {
211         enum object_type type;
212         void *data;
213         unsigned long size;
214         int ret;
215
216         if (item->object.parsed)
217                 return 0;
218         data = read_object_file(&item->object.oid, &type, &size);
219         if (!data)
220                 return error("Could not read %s",
221                              oid_to_hex(&item->object.oid));
222         if (type != OBJ_TAG) {
223                 free(data);
224                 return error("Object %s not a tag",
225                              oid_to_hex(&item->object.oid));
226         }
227         ret = parse_tag_buffer(the_repository, item, data, size);
228         free(data);
229         return ret;
230 }
231
232 struct object_id *get_tagged_oid(struct tag *tag)
233 {
234         if (!tag->tagged)
235                 die("bad tag");
236         return &tag->tagged->oid;
237 }