root/builtin/verify-tag.c

DEFINITIONS

1. run_gpg_verify
2. verify_tag
3. git_verify_tag_config
4. cmd_verify_tag

/*
 * Builtin "git verify-tag"
 *
 * Copyright (c) 2007 Carlos Rica <jasampler@gmail.com>
 *
 * Based on git-verify-tag.sh
 */
#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>..."),
                NULL
};

static int run_gpg_verify(const char *buf, unsigned long size, unsigned flags)
{
        struct signature_check sigc;
        int len;
        int ret;

        memset(&sigc, 0, sizeof(sigc));

        len = parse_signature(buf, size);

        if (size == len) {
                if (flags & GPG_VERIFY_VERBOSE)
                        write_in_full(1, buf, len);
                return error("no signature found");
        }

        ret = check_signature(buf, len, buf + len, size - len, &sigc);
        print_signature_buffer(&sigc, flags);

        signature_check_clear(&sigc);
        return ret;
}

static int verify_tag(const char *name, unsigned flags)
{
        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, flags);

        free(buf);
        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;
        unsigned flags = 0;
        const struct option verify_tag_options[] = {
                OPT__VERBOSE(&verbose, N_("print tag contents")),
                OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
                OPT_END()
        };

        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);

        if (verbose)
                flags |= GPG_VERIFY_VERBOSE;

        /* sometimes the program was terminated because this signal
         * was received in the process of writing the gpg input: */
        signal(SIGPIPE, SIG_IGN);
        while (i < argc)
                if (verify_tag(argv[i++], flags))
                        had_error = 1;
        return had_error;
}