Re: [PATCH v2 04/34] sequencer (rebase -i): implement the 'exec' command

> +static int do_exec(const char *command_line)
> +{
> +	const char *child_argv[] = { NULL, NULL };
> +	int dirty, status;
> +
> +	fprintf(stderr, "Executing: %s\n", command_line);
> +	child_argv[0] = command_line;
> +	status = run_command_v_opt(child_argv, RUN_USING_SHELL);
> +
> +	/* force re-reading of the cache */
> +	if (discard_cache() < 0 || read_cache() < 0)
> +		return error(_("could not read index"));
> +
> +	dirty = require_clean_work_tree("rebase", NULL, 1, 1);
> +
> +	if (status) {
> +		warning(_("execution failed: %s\n%s"
> +			  "You can fix the problem, and then run\n"
> +			  "\n"
> +			  "  git rebase --continue\n"
> +			  "\n"),
> +			command_line,
> +			dirty ? N_("and made changes to the index and/or the "
> +				"working tree\n") : "");
> +		if (status == 127)
> +			/* command not found */
> +			status = 1;
> +	}
> +	else if (dirty) {
> +		warning(_("execution succeeded: %s\nbut "
> +			  "left changes to the index and/or the working tree\n"
> +			  "Commit or stash your changes, and then run\n"
> +			  "\n"
> +			  "  git rebase --continue\n"
> +			  "\n"), command_line);
> +		status = 1;
> +	}
> +
> +	return status;
> +}