make the location of the swclock reference file configurable

This fixes #565.

conf.d/meson.build

@@ -7,6 +7,7 @@ conf_common = [
   'localmount',
   'netmount',
   'swap',
+  'swclock',
   ]
 
 conf_net = [

conf.d/swclock

@@ -0,0 +1,6 @@
+# This is the location of the reference file swclock uses to set the
+# system date and time.
+# This is the default path. If you are using it, you do not need to
+# uncomment it. If you are using the default and have /var on its own
+# file system, you need to add the appropriate rc_after setting.
+# swclock_file=/var/lib/misc/openrc-shutdowntime

init.d/swclock.in

@@ -10,6 +10,7 @@
 # except according to the terms contained in the LICENSE file.
 
 description="Sets the local clock to the mtime of a given file."
+swclock_file="${swclock_file:-/var/lib/misc/openrc-shutdowntime}"
 
 depend()
 {
@@ -22,7 +23,7 @@ depend()
 start()
 {
 	ebegin "Setting the local clock based on last shutdown time"
-	if ! swclock 2> /dev/null; then
+	if ! swclock "${swclock_file}" 2> /dev/null; then
 	swclock --warn @SBINDIR@/openrc-run
 	fi
 	eend $?
@@ -31,6 +32,6 @@ start()
 stop()
 {
 	ebegin "Saving the shutdown time"
-	swclock --save
+	swclock --save "${swclock_file}"
 	eend $?
 }