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