From d142c8df78d029d9714e5e7fb367b05696dcb302 Mon Sep 17 00:00:00 2001
From: mglae <mglmail@arcor.de>
Date: Wed, 10 Jun 2020 23:46:03 +0200
Subject: [PATCH] wait-time-sync: new package to reliable detect ntp
 synchronized system time

---
 packages/sysutils/wait-time-sync/package.mk   | 15 ++++++++++
 .../sysutils/wait-time-sync/sources/Makefile  | 12 ++++++++
 .../wait-time-sync/sources/wait-time-sync.c   | 23 +++++++++++++++
 .../system.d/wait-time-sync.service           | 28 +++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 packages/sysutils/wait-time-sync/package.mk
 create mode 100644 packages/sysutils/wait-time-sync/sources/Makefile
 create mode 100644 packages/sysutils/wait-time-sync/sources/wait-time-sync.c
 create mode 100644 packages/sysutils/wait-time-sync/system.d/wait-time-sync.service

diff --git a/packages/sysutils/wait-time-sync/package.mk b/packages/sysutils/wait-time-sync/package.mk
new file mode 100644
index 0000000000..b45468f08b
--- /dev/null
+++ b/packages/sysutils/wait-time-sync/package.mk
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020-present Team LibreELEC (https://libreelec.tv)
+
+PKG_NAME="wait-time-sync"
+PKG_VERSION="1.0"
+PKG_LICENSE="GPL"
+PKG_SITE=""
+PKG_URL=""
+PKG_DEPENDS_TARGET="toolchain"
+PKG_LONGDESC="A simple tool and systemd service to wait until NTP time is synced"
+
+
+post_install() {
+  enable_service wait-time-sync.service
+}
diff --git a/packages/sysutils/wait-time-sync/sources/Makefile b/packages/sysutils/wait-time-sync/sources/Makefile
new file mode 100644
index 0000000000..1014a4452e
--- /dev/null
+++ b/packages/sysutils/wait-time-sync/sources/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020-present Team LibreELEC (https://libreelec.tv)
+
+.PHONY: all
+all: wait-time-sync
+
+PREFIX = /usr
+
+.PHONY: install
+install: wait-time-sync
+	install -d $(DESTDIR)$(PREFIX)/bin
+	install $< $(DESTDIR)$(PREFIX)/bin
diff --git a/packages/sysutils/wait-time-sync/sources/wait-time-sync.c b/packages/sysutils/wait-time-sync/sources/wait-time-sync.c
new file mode 100644
index 0000000000..52cd5d780a
--- /dev/null
+++ b/packages/sysutils/wait-time-sync/sources/wait-time-sync.c
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020-present Team LibreELEC (https://libreelec.tv) */
+
+#include <sys/timex.h>
+#include <unistd.h>
+#include <errno.h>
+
+int main()
+{
+  int rc;
+
+  for (;;)
+  {
+    struct timex tx = {};
+
+    rc = adjtimex(&tx);
+    if (rc != TIME_ERROR)
+      break;
+    usleep(1000000U/3);
+  }
+
+  return rc == -1 ? errno : 0;
+}
diff --git a/packages/sysutils/wait-time-sync/system.d/wait-time-sync.service b/packages/sysutils/wait-time-sync/system.d/wait-time-sync.service
new file mode 100644
index 0000000000..2a875353ea
--- /dev/null
+++ b/packages/sysutils/wait-time-sync/system.d/wait-time-sync.service
@@ -0,0 +1,28 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file was part of systemd.
+#  Modified by Team LibreELEC (https://libreelec.tv)
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Wait For Kernel Time Synchronized
+
+ConditionVirtualization=!container
+
+DefaultDependencies=no
+Before=time-sync.target shutdown.target
+Wants=time-sync.target
+Conflicts=shutdown.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/wait-time-sync
+TimeoutStartSec=infinity
+RemainAfterExit=yes
+
+[Install]
+WantedBy=sysinit.target