Add convenient SysV init /etc/rc.local compat

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

configure.ac

@@ -86,6 +86,10 @@ AC_ARG_WITH(rcsd,
 	[rcsd=$withval], [rcsd='$(sysconfdir)/finit.d'])
 AC_SUBST(rcsd)
 
+AC_ARG_WITH(rc-local,
+        AS_HELP_STRING([--with-rc-local=FILE], [SysV init /etc/rc.local file, default /etc/rc.local]),
+	[rclocal=$withval], [rclocal=$sysconfdir/rc.local])
+
 AC_ARG_WITH(console,
         AS_HELP_STRING([--with-console=DEV], [Console to use, default: /dev/console]),
 	[console=$withval], [console=/dev/console])
@@ -154,6 +158,12 @@ AS_IF([test "x$with_config" != "xno"],[
 	conf='$(sysconfdir)/finit.conf'])
 AC_SUBST(conf)
 
+AS_IF([test "x$with_rc_local" != "xno"],[
+	AS_IF([test "x$rclocal" = "xyes"],[
+		rclocal=$sysconfdir/rc.local])])
+AC_EXPAND_DIR(lurvig, "$rclocal")
+AC_DEFINE_UNQUOTED(FINIT_RC_LOCAL, "$lurvig", [Compat SysV /etc/rc.local file to run last at boot.])
+
 AS_IF([test "x$with_heading" != "xno"],[
 	AS_IF([test "x$heading" = "xyes"],[
 		AC_MSG_ERROR([Must supply argument])])

finit.c

@@ -215,6 +215,10 @@ int main(int argc, char* argv[])
 		run_parts(runparts, NULL);
 	}
 
+	/* Convenient SysV compat for when you just don't care ... */
+	if (!access(FINIT_RC_LOCAL, X_OK))
+		run_interactive(FINIT_RC_LOCAL, "Calling SysV style rc.local: %s", FINIT_RC_LOCAL);
+
 	/* Hooks that should run at the very end */
 	plugin_run_hooks(HOOK_SYSTEM_UP);
 

m4/expand.m4

@@ -0,0 +1,17 @@
+# From https://github.com/kakaroto/e17/blob/master/BINDINGS/javascript/elixir/m4/ac_expand_dir.m4
+# By Alexandre Oliva <oliva@dcc.unicamp.br>
+
+# AC_EXPAND_DIR(VARNAME, DIR)
+# ------------------------------------------------------------
+# Expands occurrences of ${prefix} and ${exec_prefix} in the
+# given DIR, and assigns the resulting string to VARNAME
+#
+# Example: AC_DEFINE_DIR(DATADIR, "$datadir")
+AC_DEFUN([AC_EXPAND_DIR], [
+	$1=$2
+	$1=`(
+	    test "x$prefix" = xNONE && prefix="$ac_default_prefix"
+	    test "x$exec_prefix" = xNONE && exec_prefix="${prefix}"
+	    eval echo \""[$]$1"\"
+	    )`
+])