tag.c

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