git

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