Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 214 insertions, 0 deletions

diff --git a/tag.c b/tag.c
new file mode 100644
index 000000000000..5db870edb9e6
--- /dev/null
+++ b/tag.c
@@ -0,0 +1,214 @@
+#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;
+	size_t payload_size;
+	int ret;
+
+	memset(&sigc, 0, sizeof(sigc));
+
+	payload_size = parse_signature(buf, size);
+
+	if (size == payload_size) {
+		if (flags & GPG_VERIFY_VERBOSE)
+			write_in_full(1, buf, payload_size);
+		return error("no signature found");
+	}
+
+	ret = check_signature(buf, payload_size, buf + payload_size,
+				size - payload_size, &sigc);
+
+	if (!(flags & GPG_VERIFY_OMIT_STATUS))
+		print_signature_buffer(&sigc, flags);
+
+	signature_check_clear(&sigc);
+	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(r, 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;
+	item->object.parsed = 1;
+
+	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 {
+		error("Unknown type %s", type);
+		item->tagged = NULL;
+	}
+
+	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;
+
+	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;
+}