tag.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2 #define DISABLE_SIGN_COMPARE_WARNINGS
   3
   4 #include "git-compat-util.h"
   5 #include "environment.h"
   6 #include "tag.h"
   7 #include "object-name.h"
   8 #include "object-store-ll.h"
   9 #include "commit.h"
  10 #include "tree.h"
  11 #include "blob.h"
  12 #include "alloc.h"
  13 #include "gpg-interface.h"
  14 #include "hex.h"
  15 #include "packfile.h"
  16
  17 const char *tag_type = "tag";
  18
  19 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  20 {
  21         struct signature_check sigc;
  22         struct strbuf payload = STRBUF_INIT;
  23         struct strbuf signature = STRBUF_INIT;
  24         int ret;
  25
  26         memset(&sigc, 0, sizeof(sigc));
  27
  28         if (!parse_signature(buf, size, &payload, &signature)) {
  29                 if (flags & GPG_VERIFY_VERBOSE)
  30                         write_in_full(1, buf, size);
  31                 return error("no signature found");
  32         }
  33
  34         sigc.payload_type = SIGNATURE_PAYLOAD_TAG;
  35         sigc.payload = strbuf_detach(&payload, &sigc.payload_len);
  36         ret = check_signature(&sigc, signature.buf, signature.len);
  37
  38         if (!(flags & GPG_VERIFY_OMIT_STATUS))
  39                 print_signature_buffer(&sigc, flags);
  40
  41         signature_check_clear(&sigc);
  42         strbuf_release(&payload);
  43         strbuf_release(&signature);
  44         return ret;
  45 }
  46
  47 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
  48                 unsigned flags)
  49 {
  50         enum object_type type;
  51         char *buf;
  52         unsigned long size;
  53         int ret;
  54
  55         type = oid_object_info(the_repository, oid, NULL);
  56         if (type != OBJ_TAG)
  57                 return error("%s: cannot verify a non-tag object of type %s.",
  58                                 name_to_report ?
  59                                 name_to_report :
  60                                 repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV),
  61                                 type_name(type));
  62
  63         buf = repo_read_object_file(the_repository, oid, &type, &size);
  64         if (!buf)
  65                 return error("%s: unable to read file.",
  66                                 name_to_report ?
  67                                 name_to_report :
  68                                 repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV));
  69
  70         ret = run_gpg_verify(buf, size, flags);
  71
  72         free(buf);
  73         return ret;
  74 }
  75
  76 struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
  77 {
  78         struct object_id *last_oid = NULL;
  79         while (o && o->type == OBJ_TAG)
  80                 if (((struct tag *)o)->tagged) {
  81                         last_oid = &((struct tag *)o)->tagged->oid;
  82                         o = parse_object(r, last_oid);
  83                 } else {
  84                         last_oid = NULL;
  85                         o = NULL;
  86                 }
  87         if (!o && warn) {
  88                 if (last_oid && is_promisor_object(r, last_oid))
  89                         return NULL;
  90                 if (!warnlen)
  91                         warnlen = strlen(warn);
  92                 error("missing object referenced by '%.*s'", warnlen, warn);
  93         }
  94         return o;
  95 }
  96
  97 struct object *deref_tag_noverify(struct repository *r, struct object *o)
  98 {
  99         while (o && o->type == OBJ_TAG) {
 100                 o = parse_object(r, &o->oid);
 101                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
 102                         o = ((struct tag *)o)->tagged;
 103                 else
 104                         o = NULL;
 105         }
 106         return o;
 107 }
 108
 109 struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
 110 {
 111         struct object *obj = lookup_object(r, oid);
 112         if (!obj)
 113                 return create_object(r, oid, alloc_tag_node(r));
 114         return object_as_type(obj, OBJ_TAG, 0);
 115 }
 116
 117 static timestamp_t parse_tag_date(const char *buf, const char *tail)
 118 {
 119         const char *dateptr;
 120
 121         while (buf < tail && *buf++ != '>')
 122                 /* nada */;
 123         if (buf >= tail)
 124                 return 0;
 125         dateptr = buf;
 126         while (buf < tail && *buf++ != '\n')
 127                 /* nada */;
 128         if (buf >= tail)
 129                 return 0;
 130         /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
 131         return parse_timestamp(dateptr, NULL, 10);
 132 }
 133
 134 void release_tag_memory(struct tag *t)
 135 {
 136         free(t->tag);
 137         t->tagged = NULL;
 138         t->object.parsed = 0;
 139         t->date = 0;
 140 }
 141
 142 int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
 143 {
 144         struct object_id oid;
 145         char type[20];
 146         const char *bufptr = data;
 147         const char *tail = bufptr + size;
 148         const char *nl;
 149
 150         if (item->object.parsed)
 151                 return 0;
 152
 153         if (item->tag) {
 154                 /*
 155                  * Presumably left over from a previous failed parse;
 156                  * clear it out in preparation for re-parsing (we'll probably
 157                  * hit the same error, which lets us tell our current caller
 158                  * about the problem).
 159                  */
 160                 FREE_AND_NULL(item->tag);
 161         }
 162
 163         if (size < the_hash_algo->hexsz + 24)
 164                 return -1;
 165         if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
 166                 return -1;
 167
 168         if (!starts_with(bufptr, "type "))
 169                 return -1;
 170         bufptr += 5;
 171         nl = memchr(bufptr, '\n', tail - bufptr);
 172         if (!nl || sizeof(type) <= (nl - bufptr))
 173                 return -1;
 174         memcpy(type, bufptr, nl - bufptr);
 175         type[nl - bufptr] = '\0';
 176         bufptr = nl + 1;
 177
 178         if (!strcmp(type, blob_type)) {
 179                 item->tagged = (struct object *)lookup_blob(r, &oid);
 180         } else if (!strcmp(type, tree_type)) {
 181                 item->tagged = (struct object *)lookup_tree(r, &oid);
 182         } else if (!strcmp(type, commit_type)) {
 183                 item->tagged = (struct object *)lookup_commit(r, &oid);
 184         } else if (!strcmp(type, tag_type)) {
 185                 item->tagged = (struct object *)lookup_tag(r, &oid);
 186         } else {
 187                 return error("unknown tag type '%s' in %s",
 188                              type, oid_to_hex(&item->object.oid));
 189         }
 190
 191         if (!item->tagged)
 192                 return error("bad tag pointer to %s in %s",
 193                              oid_to_hex(&oid),
 194                              oid_to_hex(&item->object.oid));
 195
 196         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 197                 ;               /* good */
 198         else
 199                 return -1;
 200         bufptr += 4;
 201         nl = memchr(bufptr, '\n', tail - bufptr);
 202         if (!nl)
 203                 return -1;
 204         item->tag = xmemdupz(bufptr, nl - bufptr);
 205         bufptr = nl + 1;
 206
 207         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 208                 item->date = parse_tag_date(bufptr, tail);
 209         else
 210                 item->date = 0;
 211
 212         item->object.parsed = 1;
 213         return 0;
 214 }
 215
 216 int parse_tag(struct tag *item)
 217 {
 218         enum object_type type;
 219         void *data;
 220         unsigned long size;
 221         int ret;
 222
 223         if (item->object.parsed)
 224                 return 0;
 225         data = repo_read_object_file(the_repository, &item->object.oid, &type,
 226                                      &size);
 227         if (!data)
 228                 return error("Could not read %s",
 229                              oid_to_hex(&item->object.oid));
 230         if (type != OBJ_TAG) {
 231                 free(data);
 232                 return error("Object %s not a tag",
 233                              oid_to_hex(&item->object.oid));
 234         }
 235         ret = parse_tag_buffer(the_repository, item, data, size);
 236         free(data);
 237         return ret;
 238 }
 239
 240 struct object_id *get_tagged_oid(struct tag *tag)
 241 {
 242         if (!tag->tagged)
 243                 die("bad tag");
 244         return &tag->tagged->oid;
 245 }