From 71769cb74c9f9bd401e717ac2b04d739058f1289 Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Tue, 28 Dec 2021 09:49:44 +0100
Subject: [PATCH] raven/labsync: declaratively build tftp env

Fixes #8.
---
 .gitattributes                                |  2 ++
 machines/raven/services/default.nix           |  2 +-
 .../{labsync.nix => labsync/default.nix}      | 13 ++++++++++--
 machines/raven/services/labsync/pxelinux.cfg  | 21 +++++++++++++++++++
 machines/raven/services/labsync/splash.png    |  3 +++
 5 files changed, 38 insertions(+), 3 deletions(-)
 rename machines/raven/services/{labsync.nix => labsync/default.nix} (54%)
 create mode 100644 machines/raven/services/labsync/pxelinux.cfg
 create mode 100644 machines/raven/services/labsync/splash.png

diff --git a/.gitattributes b/.gitattributes
index 13b84cc..f769614 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,3 @@
 **/secrets.yaml diff=sops
+
+*.png filter=lfs diff=lfs merge=lfs -text
diff --git a/machines/raven/services/default.nix b/machines/raven/services/default.nix
index c4f05bf..420c68a 100644
--- a/machines/raven/services/default.nix
+++ b/machines/raven/services/default.nix
@@ -3,7 +3,7 @@
     ./asterisk.nix
     ./dnsmasq.nix
     ./dyndns.nix
-    ./labsync.nix
+    ./labsync
     ./unifi-controller.nix
   ];
 }
diff --git a/machines/raven/services/labsync.nix b/machines/raven/services/labsync/default.nix
similarity index 54%
rename from machines/raven/services/labsync.nix
rename to machines/raven/services/labsync/default.nix
index 985fe66..471a62c 100644
--- a/machines/raven/services/labsync.nix
+++ b/machines/raven/services/labsync/default.nix
@@ -1,11 +1,13 @@
 # legacy labsync, currently partly implemented in docker outside of this configuration
+{ pkgs, ... }:
+
 {
   services.opentracker.enable = true;
 
   services.nginx.virtualHosts."labsync.lab.fablab-nea.de" = {
     locations = {
       "/" = {
-        root = "/opt/docker/tftpgen/data/labsync";
+        root = "/opt/docker/tftpgen/data";
         extraConfig = ''
           autoindex on;
         '';
@@ -16,7 +18,14 @@
 
   services.atftpd = {
     enable = true;
-    root = "/opt/docker/tftpgen/data";
+    root = pkgs.runCommand "pxelinux-tftproot" { } ''
+      mkdir -p $out/pxelinux.cfg
+      cp ${pkgs.syslinux}/share/syslinux/{ldlinux.c32,libcom32.c32,libutil.c32,lpxelinux.0,vesamenu.c32} $out
+      cp ${./splash.png} $out/splash.png
+      cp ${./pxelinux.cfg} $out/pxelinux.cfg/default
+      # required to serve labsync/labsync.cfg, which is generated dynamically by a docker container
+      ln -s /opt/docker/tftpgen/data $out/labsync
+    '';
   };
 
   networking.firewall.allowedTCPPorts = [
diff --git a/machines/raven/services/labsync/pxelinux.cfg b/machines/raven/services/labsync/pxelinux.cfg
new file mode 100644
index 0000000..0aa7cc9
--- /dev/null
+++ b/machines/raven/services/labsync/pxelinux.cfg
@@ -0,0 +1,21 @@
+# default menu settings
+menu width 100
+menu height 24
+menu title labsync
+
+# can be overwriten by mounting another image; has to be 1024×768 in 16:9
+menu background splash.png
+menu color border	* #00000000 #00000000 none
+menu color sel		* #ffffffff #76a1d0ff *
+menu color hotsel	1;7;37;40 #ffffffff #76a1d0ff *
+menu cmdlinerow 16
+menu timeoutrow 16
+menu tabmsgrow 18
+# do not show “press tab to edit options…” entry (empty)
+menu tabmsg
+
+include labsync/labsync.cfg
+default vesamenu.c32
+
+# disable timeout (explicitly)
+timeout 0
diff --git a/machines/raven/services/labsync/splash.png b/machines/raven/services/labsync/splash.png
new file mode 100644
index 0000000..8cd09d9
--- /dev/null
+++ b/machines/raven/services/labsync/splash.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:59980cbbf0c87d3d5045c7434e294fc04a8b313181e079104881bf62589adf2c
+size 878475