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
  10 const char *tag_type = "tag";
  11
  12 static 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
  38 int 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
  67 struct object *deref_tag(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(the_repository,
  72                                          &((struct tag *)o)->tagged->oid);
  73                 else
  74                         o = NULL;
  75         if (!o && warn) {
  76                 if (!warnlen)
  77                         warnlen = strlen(warn);
  78                 error("missing object referenced by '%.*s'", warnlen, warn);
  79         }
  80         return o;
  81 }
  82
  83 struct object *deref_tag_noverify(struct object *o)
  84 {
  85         while (o && o->type == OBJ_TAG) {
  86                 o = parse_object(the_repository, &o->oid);
  87                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
  88                         o = ((struct tag *)o)->tagged;
  89                 else
  90                         o = NULL;
  91         }
  92         return o;
  93 }
  94
  95 struct tag *lookup_tag(const struct object_id *oid)
  96 {
  97         struct object *obj = lookup_object(the_repository, oid->hash);
  98         if (!obj)
  99                 return create_object(the_repository, oid->hash,
 100                                      alloc_tag_node(the_repository));
 101         return object_as_type(the_repository, obj, OBJ_TAG, 0);
 102 }
 103
 104 static timestamp_t parse_tag_date(const char *buf, const char *tail)
 105 {
 106         const char *dateptr;
 107
 108         while (buf < tail && *buf++ != '>')
 109                 /* nada */;
 110         if (buf >= tail)
 111                 return 0;
 112         dateptr = buf;
 113         while (buf < tail && *buf++ != '\n')
 114                 /* nada */;
 115         if (buf >= tail)
 116                 return 0;
 117         /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
 118         return parse_timestamp(dateptr, NULL, 10);
 119 }
 120
 121 void release_tag_memory(struct tag *t)
 122 {
 123         free(t->tag);
 124         t->tagged = NULL;
 125         t->object.parsed = 0;
 126         t->date = 0;
 127 }
 128
 129 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 130 {
 131         struct object_id oid;
 132         char type[20];
 133         const char *bufptr = data;
 134         const char *tail = bufptr + size;
 135         const char *nl;
 136
 137         if (item->object.parsed)
 138                 return 0;
 139         item->object.parsed = 1;
 140
 141         if (size < GIT_SHA1_HEXSZ + 24)
 142                 return -1;
 143         if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
 144                 return -1;
 145
 146         if (!starts_with(bufptr, "type "))
 147                 return -1;
 148         bufptr += 5;
 149         nl = memchr(bufptr, '\n', tail - bufptr);
 150         if (!nl || sizeof(type) <= (nl - bufptr))
 151                 return -1;
 152         memcpy(type, bufptr, nl - bufptr);
 153         type[nl - bufptr] = '\0';
 154         bufptr = nl + 1;
 155
 156         if (!strcmp(type, blob_type)) {
 157                 item->tagged = (struct object *)lookup_blob(the_repository, &oid);
 158         } else if (!strcmp(type, tree_type)) {
 159                 item->tagged = (struct object *)lookup_tree(the_repository, &oid);
 160         } else if (!strcmp(type, commit_type)) {
 161                 item->tagged = (struct object *)lookup_commit(&oid);
 162         } else if (!strcmp(type, tag_type)) {
 163                 item->tagged = (struct object *)lookup_tag(&oid);
 164         } else {
 165                 error("Unknown type %s", type);
 166                 item->tagged = NULL;
 167         }
 168
 169         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 170                 ;               /* good */
 171         else
 172                 return -1;
 173         bufptr += 4;
 174         nl = memchr(bufptr, '\n', tail - bufptr);
 175         if (!nl)
 176                 return -1;
 177         item->tag = xmemdupz(bufptr, nl - bufptr);
 178         bufptr = nl + 1;
 179
 180         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 181                 item->date = parse_tag_date(bufptr, tail);
 182         else
 183                 item->date = 0;
 184
 185         return 0;
 186 }
 187
 188 int parse_tag(struct tag *item)
 189 {
 190         enum object_type type;
 191         void *data;
 192         unsigned long size;
 193         int ret;
 194
 195         if (item->object.parsed)
 196                 return 0;
 197         data = read_object_file(&item->object.oid, &type, &size);
 198         if (!data)
 199                 return error("Could not read %s",
 200                              oid_to_hex(&item->object.oid));
 201         if (type != OBJ_TAG) {
 202                 free(data);
 203                 return error("Object %s not a tag",
 204                              oid_to_hex(&item->object.oid));
 205         }
 206         ret = parse_tag_buffer(item, data, size);
 207         free(data);
 208         return ret;
 209 }