root/builtin/verify-commit.c

DEFINITIONS

1. run_gpg_verify
2. verify_commit
3. git_verify_commit_config
4. cmd_verify_commit

/*
 * Builtin "git commit-commit"
 *
 * Copyright (c) 2014 Michael J Gruber <git@drmicha.warpmail.net>
 *
 * Based on git-verify-tag
 */
#include "cache.h"
#include "builtin.h"
#include "commit.h"
#include "run-command.h"
#include <signal.h>
#include "parse-options.h"
#include "gpg-interface.h"

static const char * const verify_commit_usage[] = {
                N_("git verify-commit [-v | --verbose] <commit>..."),
                NULL
};

static int run_gpg_verify(const unsigned char *sha1, const char *buf, unsigned long size, unsigned flags)
{
        struct signature_check signature_check;
        int ret;

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

        ret = check_commit_signature(lookup_commit(sha1), &signature_check);
        print_signature_buffer(&signature_check, flags);

        signature_check_clear(&signature_check);
        return ret;
}

static int verify_commit(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("commit '%s' not found.", name);

        buf = read_sha1_file(sha1, &type, &size);
        if (!buf)
                return error("%s: unable to read file.", name);
        if (type != OBJ_COMMIT)
                return error("%s: cannot verify a non-commit object of type %s.",
                                name, typename(type));

        ret = run_gpg_verify(sha1, buf, size, flags);

        free(buf);
        return ret;
}

static int git_verify_commit_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_commit(int argc, const char **argv, const char *prefix)
{
        int i = 1, verbose = 0, had_error = 0;
        unsigned flags = 0;
        const struct option verify_commit_options[] = {
                OPT__VERBOSE(&verbose, N_("print commit contents")),
                OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
                OPT_END()
        };

        git_config(git_verify_commit_config, NULL);

        argc = parse_options(argc, argv, prefix, verify_commit_options,
                             verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
        if (argc <= i)
                usage_with_options(verify_commit_usage, verify_commit_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_commit(argv[i++], flags))
                        had_error = 1;
        return had_error;
}