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* Builtin "git verify-tag"
* Copyright (c) 2007 Carlos Rica <>
* Based on
#include "cache.h"
#include "builtin.h"
#include "tag.h"
#include "run-command.h"
#include <signal.h>
#include "parse-options.h"
#include "gpg-interface.h"
static const char * const verify_tag_usage[] = {
N_("git verify-tag [-v|--verbose] <tag>..."),
static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
int len;
len = parse_signature(buf, size);
if (verbose)
write_in_full(1, buf, len);
if (size == len)
return error("no signature found");
return verify_signed_buffer(buf, len, buf + len, size - len, NULL);
static int verify_tag(const char *name, int verbose)
enum object_type type;
unsigned char sha1[20];
char *buf;
unsigned long size;
int ret;
if (get_sha1(name, sha1))
return error("tag '%s' not found.", name);
type = sha1_object_info(sha1, NULL);
if (type != OBJ_TAG)
return error("%s: cannot verify a non-tag object of type %s.",
name, typename(type));
buf = read_sha1_file(sha1, &type, &size);
if (!buf)
return error("%s: unable to read file.", name);
ret = run_gpg_verify(buf, size, verbose);
return ret;
static int git_verify_tag_config(const char *var, const char *value, void *cb)
int status = git_gpg_config(var, value, cb);
if (status)
return status;
return git_default_config(var, value, cb);
int cmd_verify_tag(int argc, const char **argv, const char *prefix)
int i = 1, verbose = 0, had_error = 0;
const struct option verify_tag_options[] = {
OPT__VERBOSE(&verbose, N_("print tag contents")),
git_config(git_verify_tag_config, NULL);
argc = parse_options(argc, argv, prefix, verify_tag_options,
verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
if (argc <= i)
usage_with_options(verify_tag_usage, verify_tag_options);
/* sometimes the program was terminated because this signal
* was received in the process of writing the gpg input: */
while (i < argc)
if (verify_tag(argv[i++], verbose))
had_error = 1;
return had_error;
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