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
   8 const char *tag_type = "tag";
   9
  10 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  11 {
  12         struct signature_check sigc;
  13         size_t payload_size;
  14         int ret;
  15
  16         memset(&sigc, 0, sizeof(sigc));
  17
  18         payload_size = parse_signature(buf, size);
  19
  20         if (size == payload_size) {
  21                 if (flags & GPG_VERIFY_VERBOSE)
  22                         write_in_full(1, buf, payload_size);
  23                 return error("no signature found");
  24         }
  25
  26         ret = check_signature(buf, payload_size, buf + payload_size,
  27                                 size - payload_size, &sigc);
  28
  29         if (!(flags & GPG_VERIFY_OMIT_STATUS))
  30                 print_signature_buffer(&sigc, flags);
  31
  32         signature_check_clear(&sigc);
  33         return ret;
  34 }
  35
  36 int gpg_verify_tag(const unsigned char *sha1, const char *name_to_report,
  37                 unsigned flags)
  38 {
  39         enum object_type type;
  40         char *buf;
  41         unsigned long size;
  42         int ret;
  43
  44         type = sha1_object_info(sha1, NULL);
  45         if (type != OBJ_TAG)
  46                 return error("%s: cannot verify a non-tag object of type %s.",
  47                                 name_to_report ?
  48                                 name_to_report :
  49                                 find_unique_abbrev(sha1, DEFAULT_ABBREV),
  50                                 typename(type));
  51
  52         buf = read_sha1_file(sha1, &type, &size);
  53         if (!buf)
  54                 return error("%s: unable to read file.",
  55                                 name_to_report ?
  56                                 name_to_report :
  57                                 find_unique_abbrev(sha1, DEFAULT_ABBREV));
  58
  59         ret = run_gpg_verify(buf, size, flags);
  60
  61         free(buf);
  62         return ret;
  63 }
  64
  65 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
  66 {
  67         while (o && o->type == OBJ_TAG)
  68                 if (((struct tag *)o)->tagged)
  69                         o = parse_object(((struct tag *)o)->tagged->oid.hash);
  70                 else
  71                         o = NULL;
  72         if (!o && warn) {
  73                 if (!warnlen)
  74                         warnlen = strlen(warn);
  75                 error("missing object referenced by '%.*s'", warnlen, warn);
  76         }
  77         return o;
  78 }
  79
  80 struct object *deref_tag_noverify(struct object *o)
  81 {
  82         while (o && o->type == OBJ_TAG) {
  83                 o = parse_object(o->oid.hash);
  84                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
  85                         o = ((struct tag *)o)->tagged;
  86                 else
  87                         o = NULL;
  88         }
  89         return o;
  90 }
  91
  92 struct tag *lookup_tag(const unsigned char *sha1)
  93 {
  94         struct object *obj = lookup_object(sha1);
  95         if (!obj)
  96                 return create_object(sha1, alloc_tag_node());
  97         return object_as_type(obj, OBJ_TAG, 0);
  98 }
  99
 100 static unsigned long parse_tag_date(const char *buf, const char *tail)
 101 {
 102         const char *dateptr;
 103
 104         while (buf < tail && *buf++ != '>')
 105                 /* nada */;
 106         if (buf >= tail)
 107                 return 0;
 108         dateptr = buf;
 109         while (buf < tail && *buf++ != '\n')
 110                 /* nada */;
 111         if (buf >= tail)
 112                 return 0;
 113         /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
 114         return strtoul(dateptr, NULL, 10);
 115 }
 116
 117 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 118 {
 119         unsigned char sha1[20];
 120         char type[20];
 121         const char *bufptr = data;
 122         const char *tail = bufptr + size;
 123         const char *nl;
 124
 125         if (item->object.parsed)
 126                 return 0;
 127         item->object.parsed = 1;
 128
 129         if (size < 64)
 130                 return -1;
 131         if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
 132                 return -1;
 133         bufptr += 48; /* "object " + sha1 + "\n" */
 134
 135         if (!starts_with(bufptr, "type "))
 136                 return -1;
 137         bufptr += 5;
 138         nl = memchr(bufptr, '\n', tail - bufptr);
 139         if (!nl || sizeof(type) <= (nl - bufptr))
 140                 return -1;
 141         memcpy(type, bufptr, nl - bufptr);
 142         type[nl - bufptr] = '\0';
 143         bufptr = nl + 1;
 144
 145         if (!strcmp(type, blob_type)) {
 146                 item->tagged = &lookup_blob(sha1)->object;
 147         } else if (!strcmp(type, tree_type)) {
 148                 item->tagged = &lookup_tree(sha1)->object;
 149         } else if (!strcmp(type, commit_type)) {
 150                 item->tagged = &lookup_commit(sha1)->object;
 151         } else if (!strcmp(type, tag_type)) {
 152                 item->tagged = &lookup_tag(sha1)->object;
 153         } else {
 154                 error("Unknown type %s", type);
 155                 item->tagged = NULL;
 156         }
 157
 158         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 159                 ;               /* good */
 160         else
 161                 return -1;
 162         bufptr += 4;
 163         nl = memchr(bufptr, '\n', tail - bufptr);
 164         if (!nl)
 165                 return -1;
 166         item->tag = xmemdupz(bufptr, nl - bufptr);
 167         bufptr = nl + 1;
 168
 169         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 170                 item->date = parse_tag_date(bufptr, tail);
 171         else
 172                 item->date = 0;
 173
 174         return 0;
 175 }
 176
 177 int parse_tag(struct tag *item)
 178 {
 179         enum object_type type;
 180         void *data;
 181         unsigned long size;
 182         int ret;
 183
 184         if (item->object.parsed)
 185                 return 0;
 186         data = read_sha1_file(item->object.oid.hash, &type, &size);
 187         if (!data)
 188                 return error("Could not read %s",
 189                              oid_to_hex(&item->object.oid));
 190         if (type != OBJ_TAG) {
 191                 free(data);
 192                 return error("Object %s not a tag",
 193                              oid_to_hex(&item->object.oid));
 194         }
 195         ret = parse_tag_buffer(item, data, size);
 196         free(data);
 197         return ret;
 198 }