Integrate systemd unit files with paths from configure

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

.gitignore

@@ -13,6 +13,8 @@ configure
 depcomp
 install-sh
 klogd
+klogd.service
 missing
 stamp-h1
 syslogd
+syslogd.service

configure.ac

@@ -22,12 +22,15 @@ AM_SILENT_RULES([yes])
 
 AC_CONFIG_SRCDIR([src/syslogd.c])
 AC_CONFIG_HEADER([config.h])
-AC_CONFIG_FILES([Makefile src/Makefile man/Makefile])
+AC_CONFIG_FILES([Makefile src/Makefile man/Makefile klogd.service syslogd.service])
 
 AC_PROG_CC
 AC_PROG_INSTALL
 AC_HEADER_STDC
 
+# Check for required packages
+PKG_PROG_PKG_CONFIG
+
 AC_ARG_WITH(klogd-delay,
         AS_HELP_STRING([--with-klogd-delay=SEC], [when started at the same time as syslogd, default: 0]),
 	[klogd_delay=$withval], [klogd_delay='no'])
@@ -36,6 +39,10 @@ AC_ARG_WITH(syslogd-pidfile,
         AS_HELP_STRING([--with-syslogd-pidfile=FILE], [custom PID file, default: syslogd.pid]),
 	[syslogd_pidfile=$withval], [syslogd_pidfile='no'])
 
+AC_ARG_WITH(systemd,
+     [AS_HELP_STRING([--with-systemd=DIR], [Directory for systemd service files])],,
+     [with_systemd=auto])
+
 AS_IF([test "x$klogd_delay" != "xno"],[
 	AS_IF([test "x$klogd_delay" = "xyes"],[
 		AC_MSG_ERROR([Must supply argument])])
@@ -48,4 +55,25 @@ AS_IF([test "x$syslogd_pidfile" != "xno"],[
 	]
 	AC_DEFINE_UNQUOTED(SYSLOGD_PIDNAME, "$syslogd_pidfile", [Custom syslogd PID file]))
 
+# Check where to install the systemd .service file
+AS_IF([test "x$with_systemd" = "xyes" -o "x$with_systemd" = "xauto"], [
+     def_systemd=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)
+     AS_IF([test "x$def_systemd" = "x"],
+         [AS_IF([test "x$with_systemd" = "xyes"],
+	     [AC_MSG_ERROR([systemd support requested but pkg-config unable to query systemd package])])
+	     with_systemd=no], [with_systemd="$def_systemd"])]
+)
+AS_IF([test "x$with_systemd" != "xno"],
+     [AC_SUBST([systemddir], [$with_systemd])])
+AM_CONDITIONAL([HAVE_SYSTEMD], [test "x$with_systemd" != "xno"])
+
+# Expand $sbindir early, into $SBINDIR, for systemd unit file
+# NOTE: This does *not* take prefix/exec_prefix override at "make
+#       install" into account, unfortunately.
+test "x$prefix" = xNONE && prefix=$ac_default_prefix
+test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
+SBINDIR=`eval echo $sbindir`
+SBINDIR=`eval echo $SBINDIR`
+AC_SUBST(SBINDIR)
+
 AC_OUTPUT

klogd.service.in

@@ -4,7 +4,7 @@ After=syslogd.service
 
 [Service]
 Type=forking
-ExecStart=/sbin/klogd
+ExecStart=@SBINDIR@/klogd
 PIDFile=/var/run/klogd.pid
 StandardOutput=null
 Restart=on-failure

syslogd.service.in

@@ -4,7 +4,7 @@ Requires=syslog.socket
 
 [Service]
 Type=forking
-ExecStart=/sbin/syslogd
+ExecStart=@SBINDIR@/syslogd
 PIDFile=/var/run/syslogd.pid
 StandardOutput=null
 Restart=on-failure