source_date_epoch.cpp

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// SPDX-License-Identifier: GPL-2.0-or-later
 * Authors:
 *   Patrick Storz <eduard.braun2@gmx.de>
 *
 * Copyright (C) 2019 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#include <sstream>
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <glibmm/ustring.h>
 
namespace ReproducibleBuilds {
 
time_t now()
{
    time_t now = 0;
 
    char *source_date_epoch = std::getenv("SOURCE_DATE_EPOCH");
    if (source_date_epoch) {
        std::istringstream iss(source_date_epoch);
        iss >> now;
        if (iss.fail() || !iss.eof()) {
            std::cerr << "Error: Cannot parse SOURCE_DATE_EPOCH as integer\n";
            std::terminate();
        }
    }
 
    return now;
}
 
Glib::ustring now_iso_8601()
{
    Glib::ustring now_formatted;
 
    time_t now = ReproducibleBuilds::now();
    if (now) {
        const tm *now_struct;
        char buffer[25];
 
        now_struct = gmtime(&now);
        if (strftime(buffer, 25, "%Y-%m-%dT%H:%M:%S", now_struct)) {
            now_formatted = buffer;
        }
    }
 
    return now_formatted;
}
 
} // namespace ReproducibleBuilds