tag.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6
   7 const char *tag_type = "tag";
   8
   9 static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
  10 {
  11         struct signature_check sigc;
  12         size_t payload_size;
  13         int ret;
  14
  15         memset(&sigc, 0, sizeof(sigc));
  16
  17         payload_size = parse_signature(buf, size);
  18
  19         if (size == payload_size) {
  20                 if (flags & GPG_VERIFY_VERBOSE)
  21                         write_in_full(1, buf, payload_size);
  22                 return error("no signature found");
  23         }
  24
  25         ret = check_signature(buf, payload_size, buf + payload_size,
  26                                 size - payload_size, &sigc);
  27         print_signature_buffer(&sigc, flags);
  28
  29         signature_check_clear(&sigc);
  30         return ret;
  31 }
  32
  33 int gpg_verify_tag(const unsigned char *sha1, const char *name_to_report,
  34                 unsigned flags)
  35 {
  36         enum object_type type;
  37         char *buf;
  38         unsigned long size;
  39         int ret;
  40
  41         type = sha1_object_info(sha1, NULL);
  42         if (type != OBJ_TAG)
  43                 return error("%s: cannot verify a non-tag object of type %s.",
  44                                 name_to_report ?
  45                                 name_to_report :
  46                                 find_unique_abbrev(sha1, DEFAULT_ABBREV),
  47                                 typename(type));
  48
  49         buf = read_sha1_file(sha1, &type, &size);
  50         if (!buf)
  51                 return error("%s: unable to read file.",
  52                                 name_to_report ?
  53                                 name_to_report :
  54                                 find_unique_abbrev(sha1, DEFAULT_ABBREV));
  55
  56         ret = run_gpg_verify(buf, size, flags);
  57
  58         free(buf);
  59         return ret;
  60 }
  61
  62 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
  63 {
  64         while (o && o->type == OBJ_TAG)
  65                 if (((struct tag *)o)->tagged)
  66                         o = parse_object(((struct tag *)o)->tagged->oid.hash);
  67                 else
  68                         o = NULL;
  69         if (!o && warn) {
  70                 if (!warnlen)
  71                         warnlen = strlen(warn);
  72                 error("missing object referenced by '%.*s'", warnlen, warn);
  73         }
  74         return o;
  75 }
  76
  77 struct object *deref_tag_noverify(struct object *o)
  78 {
  79         while (o && o->type == OBJ_TAG) {
  80                 o = parse_object(o->oid.hash);
  81                 if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
  82                         o = ((struct tag *)o)->tagged;
  83                 else
  84                         o = NULL;
  85         }
  86         return o;
  87 }
  88
  89 struct tag *lookup_tag(const unsigned char *sha1)
  90 {
  91         struct object *obj = lookup_object(sha1);
  92         if (!obj)
  93                 return create_object(sha1, alloc_tag_node());
  94         return object_as_type(obj, OBJ_TAG, 0);
  95 }
  96
  97 static unsigned long parse_tag_date(const char *buf, const char *tail)
  98 {
  99         const char *dateptr;
 100
 101         while (buf < tail && *buf++ != '>')
 102                 /* nada */;
 103         if (buf >= tail)
 104                 return 0;
 105         dateptr = buf;
 106         while (buf < tail && *buf++ != '\n')
 107                 /* nada */;
 108         if (buf >= tail)
 109                 return 0;
 110         /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
 111         return strtoul(dateptr, NULL, 10);
 112 }
 113
 114 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 115 {
 116         unsigned char sha1[20];
 117         char type[20];
 118         const char *bufptr = data;
 119         const char *tail = bufptr + size;
 120         const char *nl;
 121
 122         if (item->object.parsed)
 123                 return 0;
 124         item->object.parsed = 1;
 125
 126         if (size < 64)
 127                 return -1;
 128         if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
 129                 return -1;
 130         bufptr += 48; /* "object " + sha1 + "\n" */
 131
 132         if (!starts_with(bufptr, "type "))
 133                 return -1;
 134         bufptr += 5;
 135         nl = memchr(bufptr, '\n', tail - bufptr);
 136         if (!nl || sizeof(type) <= (nl - bufptr))
 137                 return -1;
 138         memcpy(type, bufptr, nl - bufptr);
 139         type[nl - bufptr] = '\0';
 140         bufptr = nl + 1;
 141
 142         if (!strcmp(type, blob_type)) {
 143                 item->tagged = &lookup_blob(sha1)->object;
 144         } else if (!strcmp(type, tree_type)) {
 145                 item->tagged = &lookup_tree(sha1)->object;
 146         } else if (!strcmp(type, commit_type)) {
 147                 item->tagged = &lookup_commit(sha1)->object;
 148         } else if (!strcmp(type, tag_type)) {
 149                 item->tagged = &lookup_tag(sha1)->object;
 150         } else {
 151                 error("Unknown type %s", type);
 152                 item->tagged = NULL;
 153         }
 154
 155         if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 156                 ;               /* good */
 157         else
 158                 return -1;
 159         bufptr += 4;
 160         nl = memchr(bufptr, '\n', tail - bufptr);
 161         if (!nl)
 162                 return -1;
 163         item->tag = xmemdupz(bufptr, nl - bufptr);
 164         bufptr = nl + 1;
 165
 166         if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 167                 item->date = parse_tag_date(bufptr, tail);
 168         else
 169                 item->date = 0;
 170
 171         return 0;
 172 }
 173
 174 int parse_tag(struct tag *item)
 175 {
 176         enum object_type type;
 177         void *data;
 178         unsigned long size;
 179         int ret;
 180
 181         if (item->object.parsed)
 182                 return 0;
 183         data = read_sha1_file(item->object.oid.hash, &type, &size);
 184         if (!data)
 185                 return error("Could not read %s",
 186                              oid_to_hex(&item->object.oid));
 187         if (type != OBJ_TAG) {
 188                 free(data);
 189                 return error("Object %s not a tag",
 190                              oid_to_hex(&item->object.oid));
 191         }
 192         ret = parse_tag_buffer(item, data, size);
 193         free(data);
 194         return ret;
 195 }