From 9228dc89ea22eb34ed3867e0d45c2bff181e95f4 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 28 Jan 2020 09:10:10 +0100
Subject: initial commit

---
 .gitignore           |  2 ++
 Makefile             | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 save-time.in         | 22 ++++++++++++++++++++++
 save-time.service.in | 12 ++++++++++++
 4 files changed, 87 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100755 save-time.in
 create mode 100644 save-time.service.in

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8768b74
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+save-time
+save-time.service
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f91ca1a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,51 @@
+#
+#  save-time - script to carry system time across reboot
+#
+#  Copyright (c) 2016 Erich Eckner <opensource at eckner dot net>
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+#  USA.
+#
+
+DESTDIR	 =
+BINDIR	 = /usr/bin
+CACHEDIR	 = /var/cache
+SYSTEMDDIR	 = /usr/lib/systemd/system
+
+VERSION  = 0.0
+
+all: save-time save-time.service
+
+%: %.in
+	sed "s/#VERSION#/$(VERSION)/; s@#BINDIR#@$(BINDIR)@; s@#CACHEDIR#@$(CACHEDIR)@" $< > $@
+	[ "$@" = "save-time" ] && chmod +x "$@" || true
+
+.PHONY:	install dist clean
+
+install: all
+	install -D -m0755 -t $(DESTDIR)$(BINDIR) save-time
+	install -D -m0644 -t $(DESTDIR)$(SYSTEMDDIR) save-time.service
+
+clean:
+	rm -f save-time save-time.service
+
+dist: clean
+	git status --porcelain 2> /dev/null | grep -q "\S" && (git add .; git commit -m"neue Version: $(VERSION)") || true
+	! git tag -d v$(VERSION) 2> /dev/null
+	git tag v$(VERSION)
+	git push
+	git push --tags
+
+# End of file
diff --git a/save-time.in b/save-time.in
new file mode 100755
index 0000000..dd634b8
--- /dev/null
+++ b/save-time.in
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# save-time version #VERSION#
+
+# Save the time upon shutdown for seeding system clock on next boot.
+# This is intended to give roughly correct system time on machines
+# without rtc, but which are powered on most of the time.
+
+case "$1" in
+  'start')
+    if [ -f '#CACHEDIR#/time' ]; then
+      date -s@"$(cat '#CACHEDIR#/time')"
+    fi
+  ;;
+  'stop')
+    date +%s > '#CACHEDIR#/time'
+  ;;
+  *)
+    >&2 echo "usage: ${0##*/} (start|stop)"
+    exit 1
+  ;;
+esac
diff --git a/save-time.service.in b/save-time.service.in
new file mode 100644
index 0000000..c01137f
--- /dev/null
+++ b/save-time.service.in
@@ -0,0 +1,12 @@
+[Unit]
+Description=Save time on shutdown for next boot
+Before=ntpdate.service ntpd.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+ExecStart=#BINDIR#/save-time start
+ExecStop=#BINDIR#/save-time stop
+
+[Install]
+WantedBy=multi-user.target
-- 
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