tag.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "gpg-interface.h"
   7 #include "packfile.h"
   8
   9 const char *tag_type = "tag";
  10
  11 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  12 {
  13         struct signature_check sigc;
  14         size_t payload_size;
  15         int ret;
  16
  17         memset(&sigc, 0, sizeof(sigc));
  18
  19         payload_size = parse_signature(buf, size);
  20
  21         if (size == payload_size) {
  22                 if (flags & GPG_VERIFY_VERBOSE)
  23                         write_in_full(1, buf, payload_size);
  24                 return error("no signature found");
  25         }
  26
  27         ret = check_signature(buf, payload_size, buf + payload_size,
  28                                 size - payload_size, &sigc);
  29
  30         if (!(flags & GPG_VERIFY_OMIT_STATUS))
  31                 print_signature_buffer(&sigc, flags);
  32
  33         signature_check_clear(&sigc);
  34         return ret;
  35 }
  36
  37 int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
  38                 unsigned flags)
  39 {
  40         enum object_type type;
  41         char *buf;
  42         unsigned long size;
  43         int ret;
  44
  45         type = oid_object_info(the_repository, oid, NULL);
  46         if (type != OBJ_TAG)
  47                 return error("%s: cannot verify a non-tag object of type %s.",
  48                                 name_to_report ?
  49                                 name_to_report :
  50                                 find_unique_abbrev(oid, DEFAULT_ABBREV),
  51                                 type_name(type));
  52
  53         buf = read_object_file(oid, &type, &size);
  54         if (!buf)
  55                 return error("%s: unable to read file.",
  56                                 name_to_report ?
  57                                 name_to_report :
  58                                 find_unique_abbrev(oid, DEFAULT_ABBREV));
  59
  60         ret = run_gpg_verify(buf, size, flags);
  61
  62         free(buf);
  63         return ret;
  64 }
  65
  66 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
  67 {
  68         struct object_id *last_oid = NULL;
  69         while (o && o->type == OBJ_TAG)
  70                 if (((struct tag *)o)->tagged) {
  71                         last_oid = &((struct tag *)o)->tagged->oid;
  72                         o = parse_object(last_oid);
  73                 } else {
  74                         last_oid = NULL;
  75                         o = NULL;
  76                 }
  77         if (!o && warn) {
  78                 if (last_oid && is_promisor_object(last_oid))
  79                         return NULL;
  80                 if (!warnlen)
  81                         warnlen = strlen(warn);
  82                 error("missing object referenced by '%.*s'", warnlen, warn);
  83         }
  84         return o;
  85 }
  86
  87 struct object *deref_tag_noverify(struct object *o)
  88 {
  89         while (o && o->type == OBJ_TAG) {
  90                 o = parse_object(&o->oid);
  91                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
  92                         o = ((struct tag *)o)->tagged;
  93                 else
  94                         o = NULL;
  95         }
  96         return o;
  97 }
  98
  99 struct tag *lookup_tag(const struct object_id *oid)
 100 {
 101         struct object *obj = lookup_object(oid->hash);
 102         if (!obj)
 103                 return create_object(oid->hash, alloc_tag_node());
 104         return object_as_type(obj, OBJ_TAG, 0);
 105 }
 106
 107 static timestamp_t parse_tag_date(const char *buf, const char *tail)
 108 {
 109         const char *dateptr;
 110
 111         while (buf < tail && *buf++ != '>')
 112                 /* nada */;
 113         if (buf >= tail)
 114                 return 0;
 115         dateptr = buf;
 116         while (buf < tail && *buf++ != '\n')
 117                 /* nada */;
 118         if (buf >= tail)
 119                 return 0;
 120         /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
 121         return parse_timestamp(dateptr, NULL, 10);
 122 }
 123
 124 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 125 {
 126         struct object_id oid;
 127         char type[20];
 128         const char *bufptr = data;
 129         const char *tail = bufptr + size;
 130         const char *nl;
 131
 132         if (item->object.parsed)
 133                 return 0;
 134         item->object.parsed = 1;
 135
 136         if (size < GIT_SHA1_HEXSZ + 24)
 137                 return -1;
 138         if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
 139                 return -1;
 140
 141         if (!starts_with(bufptr, "type "))
 142                 return -1;
 143         bufptr += 5;
 144         nl = memchr(bufptr, '\n', tail - bufptr);
 145         if (!nl || sizeof(type) <= (nl - bufptr))
 146                 return -1;
 147         memcpy(type, bufptr, nl - bufptr);
 148         type[nl - bufptr] = '\0';
 149         bufptr = nl + 1;
 150
 151         if (!strcmp(type, blob_type)) {
 152                 item->tagged = (struct object *)lookup_blob(&oid);
 153         } else if (!strcmp(type, tree_type)) {
 154                 item->tagged = (struct object *)lookup_tree(&oid);
 155         } else if (!strcmp(type, commit_type)) {
 156                 item->tagged = (struct object *)lookup_commit(&oid);
 157         } else if (!strcmp(type, tag_type)) {
 158                 item->tagged = (struct object *)lookup_tag(&oid);
 159         } else {
 160                 error("Unknown type %s", type);
 161                 item->tagged = NULL;
 162         }
 163
 164         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 165                 ;               /* good */
 166         else
 167                 return -1;
 168         bufptr += 4;
 169         nl = memchr(bufptr, '\n', tail - bufptr);
 170         if (!nl)
 171                 return -1;
 172         item->tag = xmemdupz(bufptr, nl - bufptr);
 173         bufptr = nl + 1;
 174
 175         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 176                 item->date = parse_tag_date(bufptr, tail);
 177         else
 178                 item->date = 0;
 179
 180         return 0;
 181 }
 182
 183 int parse_tag(struct tag *item)
 184 {
 185         enum object_type type;
 186         void *data;
 187         unsigned long size;
 188         int ret;
 189
 190         if (item->object.parsed)
 191                 return 0;
 192         data = read_object_file(&item->object.oid, &type, &size);
 193         if (!data)
 194                 return error("Could not read %s",
 195                              oid_to_hex(&item->object.oid));
 196         if (type != OBJ_TAG) {
 197                 free(data);
 198                 return error("Object %s not a tag",
 199                              oid_to_hex(&item->object.oid));
 200         }
 201         ret = parse_tag_buffer(item, data, size);
 202         free(data);
 203         return ret;
 204 }