git-p4: auto-size the block
[git.git] / tag.c
blob86b1dcbb8270e944ac643a39835d490bbaf35b20
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "blob.h"
6 #include "gpg-interface.h"
8 const char *tag_type = "tag";
10 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
12 struct signature_check sigc;
13 size_t payload_size;
14 int ret;
16 memset(&sigc, 0, sizeof(sigc));
18 payload_size = parse_signature(buf, size);
20 if (size == payload_size) {
21 if (flags & GPG_VERIFY_VERBOSE)
22 write_in_full(1, buf, payload_size);
23 return error("no signature found");
26 ret = check_signature(buf, payload_size, buf + payload_size,
27 size - payload_size, &sigc);
29 if (!(flags & GPG_VERIFY_OMIT_STATUS))
30 print_signature_buffer(&sigc, flags);
32 signature_check_clear(&sigc);
33 return ret;
36 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
37 unsigned flags)
39 enum object_type type;
40 char *buf;
41 unsigned long size;
42 int ret;
44 type = oid_object_info(oid, NULL);
45 if (type != OBJ_TAG)
46 return error("%s: cannot verify a non-tag object of type %s.",
47 name_to_report ?
48 name_to_report :
49 find_unique_abbrev(oid, DEFAULT_ABBREV),
50 type_name(type));
52 buf = read_object_file(oid, &type, &size);
53 if (!buf)
54 return error("%s: unable to read file.",
55 name_to_report ?
56 name_to_report :
57 find_unique_abbrev(oid, DEFAULT_ABBREV));
59 ret = run_gpg_verify(buf, size, flags);
61 free(buf);
62 return ret;
65 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
67 while (o && o->type == OBJ_TAG)
68 if (((struct tag *)o)->tagged)
69 o = parse_object(&((struct tag *)o)->tagged->oid);
70 else
71 o = NULL;
72 if (!o && warn) {
73 if (!warnlen)
74 warnlen = strlen(warn);
75 error("missing object referenced by '%.*s'", warnlen, warn);
77 return o;
80 struct object *deref_tag_noverify(struct object *o)
82 while (o && o->type == OBJ_TAG) {
83 o = parse_object(&o->oid);
84 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
85 o = ((struct tag *)o)->tagged;
86 else
87 o = NULL;
89 return o;
92 struct tag *lookup_tag(const struct object_id *oid)
94 struct object *obj = lookup_object(oid->hash);
95 if (!obj)
96 return create_object(oid->hash, alloc_tag_node());
97 return object_as_type(obj, OBJ_TAG, 0);
100 static timestamp_t parse_tag_date(const char *buf, const char *tail)
102 const char *dateptr;
104 while (buf < tail && *buf++ != '>')
105 /* nada */;
106 if (buf >= tail)
107 return 0;
108 dateptr = buf;
109 while (buf < tail && *buf++ != '\n')
110 /* nada */;
111 if (buf >= tail)
112 return 0;
113 /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
114 return parse_timestamp(dateptr, NULL, 10);
117 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
119 struct object_id oid;
120 char type[20];
121 const char *bufptr = data;
122 const char *tail = bufptr + size;
123 const char *nl;
125 if (item->object.parsed)
126 return 0;
127 item->object.parsed = 1;
129 if (size < GIT_SHA1_HEXSZ + 24)
130 return -1;
131 if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
132 return -1;
134 if (!starts_with(bufptr, "type "))
135 return -1;
136 bufptr += 5;
137 nl = memchr(bufptr, '\n', tail - bufptr);
138 if (!nl || sizeof(type) <= (nl - bufptr))
139 return -1;
140 memcpy(type, bufptr, nl - bufptr);
141 type[nl - bufptr] = '\0';
142 bufptr = nl + 1;
144 if (!strcmp(type, blob_type)) {
145 item->tagged = (struct object *)lookup_blob(&oid);
146 } else if (!strcmp(type, tree_type)) {
147 item->tagged = (struct object *)lookup_tree(&oid);
148 } else if (!strcmp(type, commit_type)) {
149 item->tagged = (struct object *)lookup_commit(&oid);
150 } else if (!strcmp(type, tag_type)) {
151 item->tagged = (struct object *)lookup_tag(&oid);
152 } else {
153 error("Unknown type %s", type);
154 item->tagged = NULL;
157 if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
158 ; /* good */
159 else
160 return -1;
161 bufptr += 4;
162 nl = memchr(bufptr, '\n', tail - bufptr);
163 if (!nl)
164 return -1;
165 item->tag = xmemdupz(bufptr, nl - bufptr);
166 bufptr = nl + 1;
168 if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
169 item->date = parse_tag_date(bufptr, tail);
170 else
171 item->date = 0;
173 return 0;
176 int parse_tag(struct tag *item)
178 enum object_type type;
179 void *data;
180 unsigned long size;
181 int ret;
183 if (item->object.parsed)
184 return 0;
185 data = read_object_file(&item->object.oid, &type, &size);
186 if (!data)
187 return error("Could not read %s",
188 oid_to_hex(&item->object.oid));
189 if (type != OBJ_TAG) {
190 free(data);
191 return error("Object %s not a tag",
192 oid_to_hex(&item->object.oid));
194 ret = parse_tag_buffer(item, data, size);
195 free(data);
196 return ret;