add CI test for jffs2

tests/ci.nix

@@ -3,4 +3,5 @@
   pseudofiles = import ./pseudofiles/test.nix;
   wlan = import ./wlan/test.nix;
   pppoe = import ./pppoe/test.nix;
+  jffs2 =  import ./jffs2/test.nix;
 }

tests/jffs2/configuration.nix

@@ -0,0 +1,7 @@
+{ config, pkgs, lib, ... } :
+{
+  imports = [
+    ../../vanilla-configuration.nix
+    ../../modules/jffs2.nix
+  ];
+}

tests/jffs2/script.expect

@@ -0,0 +1,11 @@
+set timeout 10
+
+spawn socat unix-connect:vm/console -
+send "\r\n"
+expect "login:" {  send "root\r\n" }
+expect "#"
+send "echo HELLO WORLD > /hello\r\n"
+expect "#"
+send "cat /hello\r\n"
+expect 'HELLO WORLD'
+close

tests/jffs2/test.nix

@@ -0,0 +1,44 @@
+{
+  liminix
+, nixpkgs
+}:
+let img = (import liminix {
+      device = import "${liminix}/devices/qemu/";
+      liminix-config = ./configuration.nix;
+    }).outputs.jffs2boot;
+    pkgs = import <nixpkgs> { overlays = [(import ../../overlay.nix)]; };
+    inherit (pkgs.pkgsBuildBuild) routeros mips-vm;
+in pkgs.runCommand "check" {
+  nativeBuildInputs = with pkgs; [
+    mips-vm
+    expect
+    socat
+  ] ;
+} ''
+serverstatedir=$(mktemp -d -t routeros-XXXXXX)
+
+killpid(){
+  if test -e $1 && test -d /proc/`cat $1` ; then
+    pid=$(cat $1)
+    kill $pid
+  fi
+}
+
+cleanup(){
+  killpid $serverstatedir/pid
+  test -n "$MPLCONFIGDIR" && test -d "$MPLCONFIGDIR" && rm -rf "$MPLCONFIGDIR"
+  killpid foo.pid
+}
+trap cleanup EXIT
+
+fatal(){
+  err=$?
+  echo "FAIL: command $(eval echo $BASH_COMMAND) exited with code $err"
+  exit $err
+}
+trap fatal ERR
+
+mkdir vm
+mips-vm --background ./vm ${img}/vmlinux ${img}/rootfs ${img}/initramfs
+expect ${./script.expect} >$out
+''