git / git

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	#include "cache.h"
	#include "tag.h"
	#include "object-store.h"
	#include "commit.h"
	#include "tree.h"
	#include "blob.h"
	#include "alloc.h"
	#include "gpg-interface.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");
	}

	ret = check_signature(payload.buf, payload.len, signature.buf,
	signature.len, &sigc);

	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 :
	find_unique_abbrev(oid, DEFAULT_ABBREV),
	type_name(type));

	buf = read_object_file(oid, &type, &size);
	if (!buf)
	return error("%s: unable to read file.",
	name_to_report ?
	name_to_report :
	find_unique_abbrev(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 object o)
	{
	while (o && o->type == OBJ_TAG) {
	o = parse_object(the_repository, &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 = read_object_file(&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;
	}

git / git

git/tag.c