tag.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "environment.h"
   5 #include "tag.h"
   6 #include "object-name.h"
   7 #include "object-store-ll.h"
   8 #include "commit.h"
   9 #include "tree.h"
  10 #include "blob.h"
  11 #include "alloc.h"
  12 #include "gpg-interface.h"
  13 #include "hex.h"
  14 #include "packfile.h"
  15
  16 const char *tag_type = "tag";
  17
  18 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  19 {
  20         struct signature_check sigc;
  21         struct strbuf payload = STRBUF_INIT;
  22         struct strbuf signature = STRBUF_INIT;
  23         int ret;
  24
  25         memset(&sigc, 0, sizeof(sigc));
  26
  27         if (!parse_signature(buf, size, &payload, &signature)) {
  28                 if (flags & GPG_VERIFY_VERBOSE)
  29                         write_in_full(1, buf, size);
  30                 return error("no signature found");
  31         }
  32
  33         sigc.payload_type = SIGNATURE_PAYLOAD_TAG;
  34         sigc.payload = strbuf_detach(&payload, &sigc.payload_len);
  35         ret = check_signature(&sigc, signature.buf, signature.len);
  36
  37         if (!(flags & GPG_VERIFY_OMIT_STATUS))
  38                 print_signature_buffer(&sigc, flags);
  39
  40         signature_check_clear(&sigc);
  41         strbuf_release(&payload);
  42         strbuf_release(&signature);
  43         return ret;
  44 }
  45
  46 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
  47                 unsigned flags)
  48 {
  49         enum object_type type;
  50         char *buf;
  51         unsigned long size;
  52         int ret;
  53
  54         type = oid_object_info(the_repository, oid, NULL);
  55         if (type != OBJ_TAG)
  56                 return error("%s: cannot verify a non-tag object of type %s.",
  57                                 name_to_report ?
  58                                 name_to_report :
  59                                 repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV),
  60                                 type_name(type));
  61
  62         buf = repo_read_object_file(the_repository, oid, &type, &size);
  63         if (!buf)
  64                 return error("%s: unable to read file.",
  65                                 name_to_report ?
  66                                 name_to_report :
  67                                 repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV));
  68
  69         ret = run_gpg_verify(buf, size, flags);
  70
  71         free(buf);
  72         return ret;
  73 }
  74
  75 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
  76 {
  77         struct object_id *last_oid = NULL;
  78         while (o && o->type == OBJ_TAG)
  79                 if (((struct tag *)o)->tagged) {
  80                         last_oid = &((struct tag *)o)->tagged->oid;
  81                         o = parse_object(r, last_oid);
  82                 } else {
  83                         last_oid = NULL;
  84                         o = NULL;
  85                 }
  86         if (!o && warn) {
  87                 if (last_oid && is_promisor_object(last_oid))
  88                         return NULL;
  89                 if (!warnlen)
  90                         warnlen = strlen(warn);
  91                 error("missing object referenced by '%.*s'", warnlen, warn);
  92         }
  93         return o;
  94 }
  95
  96 struct object *deref_tag_noverify(struct repository *r, struct object *o)
  97 {
  98         while (o && o->type == OBJ_TAG) {
  99                 o = parse_object(r, &o->oid);
 100                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
 101                         o = ((struct tag *)o)->tagged;
 102                 else
 103                         o = NULL;
 104         }
 105         return o;
 106 }
 107
 108 struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
 109 {
 110         struct object *obj = lookup_object(r, oid);
 111         if (!obj)
 112                 return create_object(r, oid, alloc_tag_node(r));
 113         return object_as_type(obj, OBJ_TAG, 0);
 114 }
 115
 116 static timestamp_t parse_tag_date(const char *buf, const char *tail)
 117 {
 118         const char *dateptr;
 119
 120         while (buf < tail && *buf++ != '>')
 121                 /* nada */;
 122         if (buf >= tail)
 123                 return 0;
 124         dateptr = buf;
 125         while (buf < tail && *buf++ != '\n')
 126                 /* nada */;
 127         if (buf >= tail)
 128                 return 0;
 129         /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
 130         return parse_timestamp(dateptr, NULL, 10);
 131 }
 132
 133 void release_tag_memory(struct tag *t)
 134 {
 135         free(t->tag);
 136         t->tagged = NULL;
 137         t->object.parsed = 0;
 138         t->date = 0;
 139 }
 140
 141 int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
 142 {
 143         struct object_id oid;
 144         char type[20];
 145         const char *bufptr = data;
 146         const char *tail = bufptr + size;
 147         const char *nl;
 148
 149         if (item->object.parsed)
 150                 return 0;
 151
 152         if (item->tag) {
 153                 /*
 154                  * Presumably left over from a previous failed parse;
 155                  * clear it out in preparation for re-parsing (we'll probably
 156                  * hit the same error, which lets us tell our current caller
 157                  * about the problem).
 158                  */
 159                 FREE_AND_NULL(item->tag);
 160         }
 161
 162         if (size < the_hash_algo->hexsz + 24)
 163                 return -1;
 164         if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
 165                 return -1;
 166
 167         if (!starts_with(bufptr, "type "))
 168                 return -1;
 169         bufptr += 5;
 170         nl = memchr(bufptr, '\n', tail - bufptr);
 171         if (!nl || sizeof(type) <= (nl - bufptr))
 172                 return -1;
 173         memcpy(type, bufptr, nl - bufptr);
 174         type[nl - bufptr] = '\0';
 175         bufptr = nl + 1;
 176
 177         if (!strcmp(type, blob_type)) {
 178                 item->tagged = (struct object *)lookup_blob(r, &oid);
 179         } else if (!strcmp(type, tree_type)) {
 180                 item->tagged = (struct object *)lookup_tree(r, &oid);
 181         } else if (!strcmp(type, commit_type)) {
 182                 item->tagged = (struct object *)lookup_commit(r, &oid);
 183         } else if (!strcmp(type, tag_type)) {
 184                 item->tagged = (struct object *)lookup_tag(r, &oid);
 185         } else {
 186                 return error("unknown tag type '%s' in %s",
 187                              type, oid_to_hex(&item->object.oid));
 188         }
 189
 190         if (!item->tagged)
 191                 return error("bad tag pointer to %s in %s",
 192                              oid_to_hex(&oid),
 193                              oid_to_hex(&item->object.oid));
 194
 195         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 196                 ;               /* good */
 197         else
 198                 return -1;
 199         bufptr += 4;
 200         nl = memchr(bufptr, '\n', tail - bufptr);
 201         if (!nl)
 202                 return -1;
 203         item->tag = xmemdupz(bufptr, nl - bufptr);
 204         bufptr = nl + 1;
 205
 206         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 207                 item->date = parse_tag_date(bufptr, tail);
 208         else
 209                 item->date = 0;
 210
 211         item->object.parsed = 1;
 212         return 0;
 213 }
 214
 215 int parse_tag(struct tag *item)
 216 {
 217         enum object_type type;
 218         void *data;
 219         unsigned long size;
 220         int ret;
 221
 222         if (item->object.parsed)
 223                 return 0;
 224         data = repo_read_object_file(the_repository, &item->object.oid, &type,
 225                                      &size);
 226         if (!data)
 227                 return error("Could not read %s",
 228                              oid_to_hex(&item->object.oid));
 229         if (type != OBJ_TAG) {
 230                 free(data);
 231                 return error("Object %s not a tag",
 232                              oid_to_hex(&item->object.oid));
 233         }
 234         ret = parse_tag_buffer(the_repository, item, data, size);
 235         free(data);
 236         return ret;
 237 }
 238
 239 struct object_id *get_tagged_oid(struct tag *tag)
 240 {
 241         if (!tag->tagged)
 242                 die("bad tag");
 243         return &tag->tagged->oid;
 244 }