1 files changed, 103 insertions, 0 deletions
diff --git a/tests/ts/hwclock/systohc b/tests/ts/hwclock/systohc
new file mode 100755
index 0000000..228ef7c
--- /dev/null
+++ b/tests/ts/hwclock/systohc
@@ -0,0 +1,103 @@
+#!/bin/bash
+
+#
+# Copyright (C) 2007 Karel Zak <kzak@redhat.com>
+#
+# This file is part of util-linux.
+#
+# This file 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 file 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.
+#
+
+TS_TOPDIR="${0%/*}/../.."
+TS_DESC="system to hw"
+NTP_SERVER="0.fedora.pool.ntp.org"
+
+. $TS_TOPDIR/functions.sh
+ts_init "$*"
+
+ts_check_test_command "$TS_CMD_HWCLOCK"
+
+ts_skip_nonroot
+if [ "$TRAVIS_DIST" == "precise" ]; then
+	ts_skip "https://github.com/util-linux/util-linux/issues/1082"
+fi
+if [ "$GITHUB_ACTIONS" == "true" ]; then
+	ts_skip "virtual machine"
+fi
+
+ts_check_prog "bc"
+ts_check_prog "sntp"
+
+function get_offset_sys_ntp
+{
+	local ip="$@"
+	local out
+
+	# using hostname instead of IP could give us more than one offset
+	out=$(sntp --timeout 1 "$ip") || return 1
+
+	# sed must deliver a signed float or empty string for sure
+	out=$(echo "$out" | \
+		sed -n 's/.* \(\(+\|-\)[0-9]\{1,\}\.[0-9]\{1,\}\).*/\1/1p')
+
+	[ -n "$out" ] || return 1
+	echo "$out"
+}
+
+function check_diff_offset
+{
+	local a=${1#+}
+	local b=${2#+}
+	local max="$3"
+	local tmp
+
+	tmp=$(echo "$a - $b" | bc | tr -d '-')
+	echo "$tmp"
+
+	tmp=$(echo "$tmp < $max" | bc)
+	[ $tmp -eq 1 ]
+}
+
+
+# we need fixed ntp IP to get comparable offsets
+NTP_IP=$(ts_resolve_host "$NTP_SERVER") \
+	|| ts_skip "can't resolve hostname $NTP_SERVER"
+
+OFFSET_A=$(get_offset_sys_ntp "$NTP_IP") \
+	|| ts_skip "can't get ntp offset 1st, $NTP_IP"
+OFFSET_B=$(get_offset_sys_ntp "$NTP_IP") \
+	|| ts_skip "can't get ntp offset 2nd, $NTP_IP"
+
+diff=$(check_diff_offset $OFFSET_A $OFFSET_B 0.02) \
+	|| ts_skip "unreliable ntp or sys clock offsets: $NTP_IP $OFFSET_A $OFFSET_B +/-$diff"
+
+# hwclock --show should work if we have a hw clock
+tmp=$($TS_CMD_HWCLOCK --show 2>&1)
+if [ $? != "0" ]; then
+	echo "$tmp" | grep -q "Cannot access the Hardware Clock via" \
+		&& ts_skip "no hardware clock found"
+	ts_failed "hwclock --show"
+fi
+
+# call hwclock
+for i in `seq 1 10`; do
+	# only *skip* on failure for now
+	$TS_CMD_HWCLOCK --systohc || ts_skip "hwclock --systohc failed, $i"
+	$TS_CMD_HWCLOCK --hctosys || ts_skip "hwclock --hctosys failed, $i"
+done
+
+OFFSET_C=$(get_offset_sys_ntp "$NTP_IP") \
+	|| ts_skip "can't get ntp offset 3rd, $NTP_IP"
+
+diff=$(check_diff_offset "$OFFSET_B" "$OFFSET_C" 1.0) \
+	|| ts_failed "offsets $NTP_IP: $OFFSET_B $OFFSET_C +/-$diff"
+
+ts_ok "offsets $NTP_IP: $OFFSET_B $OFFSET_C +/-$diff"