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