1 files changed, 68 insertions, 0 deletions
diff --git a/src/include/source_date_epoch.h b/src/include/source_date_epoch.h
new file mode 100644
index 0000000..9080526
--- /dev/null
+++ b/src/include/source_date_epoch.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Functions to parse the "SOURCE_DATE_EPOCH" environment variable for reproducible build hacks, see
+ *     https://reproducible-builds.org/docs/source-date-epoch/
+ *//*
+ * Authors:
+ *   Patrick Storz <eduard.braun2@gmx.de>
+ *
+ * Copyright (C) 2019 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_SOURCE_DATE_EPOCH
+#define SEEN_SOURCE_DATE_EPOCH
+
+#include <sstream>
+#include <iostream>
+#include <cstdlib>
+#include <ctime>
+
+namespace ReproducibleBuilds {
+
+/** parse current time from SOURCE_DATE_EPOCH environment variable
+ *
+ *  \return current time (or zero if SOURCE_DATE_EPOCH unset)
+ */
+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";
+            exit(27);
+        }
+    }
+
+    return now;
+}
+
+/** like ReproducibleBuilds::now() but returns a ISO 8601 formatted string
+ *
+ *  \return current time as ISO 8601 formatted string (or empty string if SOURCE_DATE_EPOCH unset)
+ */
+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
+
+#endif // SEEN_SOURCE_DATE_EPOCH