Merge branch 'jt/fetch-negotiator-skipping'
[git/git.git] / tag.c
... / ...
CommitLineData
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
10const char *tag_type = "tag";
11
12static 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
38int 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
67struct object *deref_tag(struct repository *r, 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(r, &((struct tag *)o)->tagged->oid);
72 else
73 o = NULL;
74 if (!o && warn) {
75 if (!warnlen)
76 warnlen = strlen(warn);
77 error("missing object referenced by '%.*s'", warnlen, warn);
78 }
79 return o;
80}
81
82struct object *deref_tag_noverify(struct object *o)
83{
84 while (o && o->type == OBJ_TAG) {
85 o = parse_object(the_repository, &o->oid);
86 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
87 o = ((struct tag *)o)->tagged;
88 else
89 o = NULL;
90 }
91 return o;
92}
93
94struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
95{
96 struct object *obj = lookup_object(r, oid->hash);
97 if (!obj)
98 return create_object(r, oid->hash,
99 alloc_tag_node(r));
100 return object_as_type(r, obj, OBJ_TAG, 0);
101}
102
103static timestamp_t parse_tag_date(const char *buf, const char *tail)
104{
105 const char *dateptr;
106
107 while (buf < tail && *buf++ != '>')
108 /* nada */;
109 if (buf >= tail)
110 return 0;
111 dateptr = buf;
112 while (buf < tail && *buf++ != '\n')
113 /* nada */;
114 if (buf >= tail)
115 return 0;
116 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
117 return parse_timestamp(dateptr, NULL, 10);
118}
119
120void release_tag_memory(struct tag *t)
121{
122 free(t->tag);
123 t->tagged = NULL;
124 t->object.parsed = 0;
125 t->date = 0;
126}
127
128int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
129{
130 struct object_id oid;
131 char type[20];
132 const char *bufptr = data;
133 const char *tail = bufptr + size;
134 const char *nl;
135
136 if (item->object.parsed)
137 return 0;
138 item->object.parsed = 1;
139
140 if (size < GIT_SHA1_HEXSZ + 24)
141 return -1;
142 if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
143 return -1;
144
145 if (!starts_with(bufptr, "type "))
146 return -1;
147 bufptr += 5;
148 nl = memchr(bufptr, '\n', tail - bufptr);
149 if (!nl || sizeof(type) <= (nl - bufptr))
150 return -1;
151 memcpy(type, bufptr, nl - bufptr);
152 type[nl - bufptr] = '\0';
153 bufptr = nl + 1;
154
155 if (!strcmp(type, blob_type)) {
156 item->tagged = (struct object *)lookup_blob(r, &oid);
157 } else if (!strcmp(type, tree_type)) {
158 item->tagged = (struct object *)lookup_tree(r, &oid);
159 } else if (!strcmp(type, commit_type)) {
160 item->tagged = (struct object *)lookup_commit(r, &oid);
161 } else if (!strcmp(type, tag_type)) {
162 item->tagged = (struct object *)lookup_tag(r, &oid);
163 } else {
164 error("Unknown type %s", type);
165 item->tagged = NULL;
166 }
167
168 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
169 ; /* good */
170 else
171 return -1;
172 bufptr += 4;
173 nl = memchr(bufptr, '\n', tail - bufptr);
174 if (!nl)
175 return -1;
176 item->tag = xmemdupz(bufptr, nl - bufptr);
177 bufptr = nl + 1;
178
179 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
180 item->date = parse_tag_date(bufptr, tail);
181 else
182 item->date = 0;
183
184 return 0;
185}
186
187int parse_tag(struct tag *item)
188{
189 enum object_type type;
190 void *data;
191 unsigned long size;
192 int ret;
193
194 if (item->object.parsed)
195 return 0;
196 data = read_object_file(&item->object.oid, &type, &size);
197 if (!data)
198 return error("Could not read %s",
199 oid_to_hex(&item->object.oid));
200 if (type != OBJ_TAG) {
201 free(data);
202 return error("Object %s not a tag",
203 oid_to_hex(&item->object.oid));
204 }
205 ret = parse_tag_buffer(the_repository, item, data, size);
206 free(data);
207 return ret;
208}