prune: do not show error from pack-redundant when no packs are found.
[git/git.git] / tag.c
1 #include "tag.h"
2 #include "cache.h"
3
4 const char *tag_type = "tag";
5
6 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
7 {
8 while (o && o->type == tag_type)
9 o = parse_object(((struct tag *)o)->tagged->sha1);
10 if (!o && warn) {
11 if (!warnlen)
12 warnlen = strlen(warn);
13 error("missing object referenced by '%.*s'", warnlen, warn);
14 }
15 return o;
16 }
17
18 struct tag *lookup_tag(const unsigned char *sha1)
19 {
20 struct object *obj = lookup_object(sha1);
21 if (!obj) {
22 struct tag *ret = xmalloc(sizeof(struct tag));
23 memset(ret, 0, sizeof(struct tag));
24 created_object(sha1, &ret->object);
25 ret->object.type = tag_type;
26 return ret;
27 }
28 if (!obj->type)
29 obj->type = tag_type;
30 if (obj->type != tag_type) {
31 error("Object %s is a %s, not a tree",
32 sha1_to_hex(sha1), obj->type);
33 return NULL;
34 }
35 return (struct tag *) obj;
36 }
37
38 int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
39 {
40 int typelen, taglen;
41 unsigned char object[20];
42 const char *type_line, *tag_line, *sig_line;
43 char type[20];
44
45 if (item->object.parsed)
46 return 0;
47 item->object.parsed = 1;
48
49 if (size < 64)
50 return -1;
51 if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
52 return -1;
53
54 type_line = data + 48;
55 if (memcmp("\ntype ", type_line-1, 6))
56 return -1;
57
58 tag_line = strchr(type_line, '\n');
59 if (!tag_line || memcmp("tag ", ++tag_line, 4))
60 return -1;
61
62 sig_line = strchr(tag_line, '\n');
63 if (!sig_line)
64 return -1;
65 sig_line++;
66
67 typelen = tag_line - type_line - strlen("type \n");
68 if (typelen >= 20)
69 return -1;
70 memcpy(type, type_line + 5, typelen);
71 type[typelen] = '\0';
72 taglen = sig_line - tag_line - strlen("tag \n");
73 item->tag = xmalloc(taglen + 1);
74 memcpy(item->tag, tag_line + 4, taglen);
75 item->tag[taglen] = '\0';
76
77 item->tagged = lookup_object_type(object, type);
78 if (item->tagged && track_object_refs) {
79 struct object_refs *refs = alloc_object_refs(1);
80 refs->ref[0] = item->tagged;
81 set_object_refs(&item->object, refs);
82 }
83
84 return 0;
85 }
86
87 int parse_tag(struct tag *item)
88 {
89 char type[20];
90 void *data;
91 unsigned long size;
92 int ret;
93
94 if (item->object.parsed)
95 return 0;
96 data = read_sha1_file(item->object.sha1, type, &size);
97 if (!data)
98 return error("Could not read %s",
99 sha1_to_hex(item->object.sha1));
100 if (strcmp(type, tag_type)) {
101 free(data);
102 return error("Object %s not a tag",
103 sha1_to_hex(item->object.sha1));
104 }
105 ret = parse_tag_buffer(item, data, size);
106 free(data);
107 return ret;
108 }