Add a host for hydra.

nix/configuration/roles/distributed_build/default.nix

@@ -2,6 +2,7 @@
   config,
   lib,
   all_nixos_configs,
+  pkgs,
   ...
 }:
 
@@ -56,6 +57,21 @@ in
     lib.mkMerge [
       {
         nix.distributedBuilds = true;
+
+        nix.settings.substituters = lib.mkForce [ "ssh://hydra" ];
+        nix.settings.substitute = lib.mkForce true;
+        nix.settings.post-build-hook = pkgs.writeShellScript "post-build-hook" ''
+          set -euo pipefail
+          IFS=$'\n\t'
+          set -f # disable globbing
+          echo "Signing and uploading paths" $OUT_PATHS
+          #exec nix copy --to 'ssh://hydra?secret-key=/persist/manual/nix/nix-cache-key.sec' $OUT_PATHS
+          exec nix copy --to 'ssh://hydra' $OUT_PATHS
+        '';
+        nix.settings.secret-key-files = [ "/persist/manual/nix/nix-cache-key.sec" ];
+        nix.settings.trusted-public-keys = lib.mkForce [
+          "odo:0S/XKSFjjIrihQ7lbHEIebXk/c/xuoodhm0Gz26YhjA="
+        ];
       }
       {
         nix.buildMachines = (

nix/configuration/roles/qemu/files/qemurc.bash

@@ -307,7 +307,7 @@ function start_body {
     local additional_args=()
 
     if [ -n "$BIND9P" ]; then
-        additional_args+=(-device "virtio-9p-type,fsdev=${BIND9P},mount_tag=bind9p")
+        additional_args+=(-device "virtio-9p-pci,fsdev=${BIND9P},mount_tag=bind9p")
     fi
 
     if [ -n "$mount_cd" ]; then