tag.c
#include "git-compat-util.h"
#include "environment.h"
#include "tag.h"
#include "object-name.h"
#include "object-store-ll.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "alloc.h"
#include "gpg-interface.h"
#include "hex.h"
#include "packfile.h"
const char *tag_type = "tag";
static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
{
struct signature_check sigc;
struct strbuf payload = STRBUF_INIT;
struct strbuf signature = STRBUF_INIT;
int ret;
memset(&sigc, 0, sizeof(sigc));
if (!parse_signature(buf, size, &payload, &signature)) {
if (flags & GPG_VERIFY_VERBOSE)
write_in_full(1, buf, size);
return error("no signature found");
}
sigc.payload_type = SIGNATURE_PAYLOAD_TAG;
sigc.payload = strbuf_detach(&payload, &sigc.payload_len);
ret = check_signature(&sigc, signature.buf, signature.len);
if (!(flags & GPG_VERIFY_OMIT_STATUS))
print_signature_buffer(&sigc, flags);
signature_check_clear(&sigc);
strbuf_release(&payload);
strbuf_release(&signature);
return ret;
}
int gpg_verify_tag(const struct object_id *oid, const char *name_to_report,
unsigned flags)
{
enum object_type type;
char *buf;
unsigned long size;
int ret;
type = oid_object_info(the_repository, oid, NULL);
if (type != OBJ_TAG)
return error("%s: cannot verify a non-tag object of type %s.",
name_to_report ?
name_to_report :
repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV),
type_name(type));
buf = repo_read_object_file(the_repository, oid, &type, &size);
if (!buf)
return error("%s: unable to read file.",
name_to_report ?
name_to_report :
repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV));
ret = run_gpg_verify(buf, size, flags);
free(buf);
return ret;
}
struct object *deref_tag(struct repository *r, struct object *o, const char *warn, int warnlen)
{
struct object_id *last_oid = NULL;
while (o && o->type == OBJ_TAG)
if (((struct tag *)o)->tagged) {
last_oid = &((struct tag *)o)->tagged->oid;
o = parse_object(r, last_oid);
} else {
last_oid = NULL;
o = NULL;
}
if (!o && warn) {
if (last_oid && is_promisor_object(last_oid))
return NULL;
if (!warnlen)
warnlen = strlen(warn);
error("missing object referenced by '%.*s'", warnlen, warn);
}
return o;
}
struct object *deref_tag_noverify(struct repository *r, struct object *o)
{
while (o && o->type == OBJ_TAG) {
o = parse_object(r, &o->oid);
if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
o = ((struct tag *)o)->tagged;
else
o = NULL;
}
return o;
}
struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
{
struct object *obj = lookup_object(r, oid);
if (!obj)
return create_object(r, oid, alloc_tag_node(r));
return object_as_type(obj, OBJ_TAG, 0);
}
static timestamp_t parse_tag_date(const char *buf, const char *tail)
{
const char *dateptr;
while (buf < tail && *buf++ != '>')
/* nada */;
if (buf >= tail)
return 0;
dateptr = buf;
while (buf < tail && *buf++ != '\n')
/* nada */;
if (buf >= tail)
return 0;
/* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
return parse_timestamp(dateptr, NULL, 10);
}
void release_tag_memory(struct tag *t)
{
free(t->tag);
t->tagged = NULL;
t->object.parsed = 0;
t->date = 0;
}
int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, unsigned long size)
{
struct object_id oid;
char type[20];
const char *bufptr = data;
const char *tail = bufptr + size;
const char *nl;
if (item->object.parsed)
return 0;
if (item->tag) {
/*
* Presumably left over from a previous failed parse;
* clear it out in preparation for re-parsing (we'll probably
* hit the same error, which lets us tell our current caller
* about the problem).
*/
FREE_AND_NULL(item->tag);
}
if (size < the_hash_algo->hexsz + 24)
return -1;
if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
return -1;
if (!starts_with(bufptr, "type "))
return -1;
bufptr += 5;
nl = memchr(bufptr, '\n', tail - bufptr);
if (!nl || sizeof(type) <= (nl - bufptr))
return -1;
memcpy(type, bufptr, nl - bufptr);
type[nl - bufptr] = '\0';
bufptr = nl + 1;
if (!strcmp(type, blob_type)) {
item->tagged = (struct object *)lookup_blob(r, &oid);
} else if (!strcmp(type, tree_type)) {
item->tagged = (struct object *)lookup_tree(r, &oid);
} else if (!strcmp(type, commit_type)) {
item->tagged = (struct object *)lookup_commit(r, &oid);
} else if (!strcmp(type, tag_type)) {
item->tagged = (struct object *)lookup_tag(r, &oid);
} else {
return error("unknown tag type '%s' in %s",
type, oid_to_hex(&item->object.oid));
}
if (!item->tagged)
return error("bad tag pointer to %s in %s",
oid_to_hex(&oid),
oid_to_hex(&item->object.oid));
if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
; /* good */
else
return -1;
bufptr += 4;
nl = memchr(bufptr, '\n', tail - bufptr);
if (!nl)
return -1;
item->tag = xmemdupz(bufptr, nl - bufptr);
bufptr = nl + 1;
if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
item->date = parse_tag_date(bufptr, tail);
else
item->date = 0;
item->object.parsed = 1;
return 0;
}
int parse_tag(struct tag *item)
{
enum object_type type;
void *data;
unsigned long size;
int ret;
if (item->object.parsed)
return 0;
data = repo_read_object_file(the_repository, &item->object.oid, &type,
&size);
if (!data)
return error("Could not read %s",
oid_to_hex(&item->object.oid));
if (type != OBJ_TAG) {
free(data);
return error("Object %s not a tag",
oid_to_hex(&item->object.oid));
}
ret = parse_tag_buffer(the_repository, item, data, size);
free(data);
return ret;
}
struct object_id *get_tagged_oid(struct tag *tag)
{
if (!tag->tagged)
die("bad tag");
return &tag->tagged->oid;
}