modules/cluster: prepare for leon

modules/cluster/default.nix

@@ -49,6 +49,12 @@ in {
       uid = 1001;
       sshKeys = config.users.users.root.openssh.authorizedKeys.keys;
     };
+    users.leon = {
+      uid = 1002;
+      sshKeys = with import ../../users.nix;
+        leon.sshKeys ++
+        astro.sshKeys;
+    };
     deploy.customizationModule = ./deployment.nix;
 
     storage.glusterfs = {

modules/cluster/deployment.nix

@@ -33,6 +33,8 @@ let
     then s
     else withoutLeadingSlash s';
 
+  writableStoreOverlayImage = "/var/tmp/${user}-${repo}-${vmName}-overlay.img";
+
 in
 {
   deployment.networks = nets;
@@ -42,6 +44,11 @@ in
     vcpu = config.deployment.vcpu;
     mem = config.deployment.mem;
 
+    preStart = ''
+      # Discard old writable store overlay
+      rm -f "${writableStoreOverlayImage}"
+    '';
+
     shares = [ {
       proto = "virtiofs";
       tag = "ro-store";
@@ -55,12 +62,12 @@ in
       source = "/glusterfs/fast/microvms/${user}/${repo}/${vmName}/${withoutLeadingSlash mountPoint}";
       inherit mountPoint;
     }) config.deployment.persistedShares;
-    # volumes = [ {
-    #   image = "/glusterfs/fast/microvms/${user}/${repo}/${vmName}/overlay.img";
-    #   mountPoint = "/";
-    #   size = 8 * 1024;
-    # } ];
-    # writableStoreOverlay = "/nix/.rw-store";
+    volumes = [ {
+      image = writableStoreOverlayImage;
+      mountPoint = config.microvm.writableStoreOverlay;
+      size = 8 * 1024;
+    } ];
+    writableStoreOverlay = "/nix/.rw-store";
 
     interfaces = map (net: {
       type = "tap";