Reduce kept generations

flake.nix

@@ -60,7 +60,10 @@
       orangepihole = nixpkgs.lib.nixosSystem {
         system = "aarch64-linux";
         specialArgs = { inherit inputs; };
-        modules = [ ./systems/orangepihole/configuration.nix ];
+        modules = [
+          impermanence.nixosModules.impermanence
+          ./systems/orangepihole/configuration.nix
+        ];
       };
     };
     deploy = {

modules/common/nix.nix

@@ -13,7 +13,7 @@
     };
     gc = {
       automatic = true;
-      options = "--delete-older-than 30d";
+      options = "--delete-older-than 7d";
       dates = "weekly";
     };
     optimise.automatic = true;

secrets/secret.yaml

@@ -2,6 +2,8 @@ root:
     password: ENC[AES256_GCM,data:u8vkGrHjAq2tDIJEbEMNPrPe7GCQNixVRRPxYPyPLvTzEApiBwsgaHp8QbMeDYGSGGkzh7EOBVeFVjUsxUtwzuYXPFILeDniUw==,iv:AoRZB3GMrn/qXgu/CMghXuu0ReHDmLdRNHAcKPgirnQ=,tag:7jlaBeKHuCa1JfV7sHo05Q==,type:str]
 gmail:
     password: ENC[AES256_GCM,data:rCL2RzU1INRT5KOyl1JriQ==,iv:jhFDcNHgIJnZTBN9msECQWvy75IH1wO5IFAxqR4Ugng=,tag:cK+A4Os/9xchpNjpb2KAbQ==,type:str]
+nixremote:
+    sshkey: ENC[AES256_GCM,data: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,iv:kgf480Q2uBqgIQZ72mN/OKMwmUEZ0fYYdv6oufSJbYw=,tag:QkuR5slR2EhY3uDB1FLF9A==,type:str]
 sops:
     kms: []
     gcp_kms: []
@@ -44,8 +46,8 @@ sops:
             OFd1RTNYcGJGSXJOaFpnbjR6YzhjQzAKUZxz47g2MKCVTS1gGJ7p6XCubBu+/CUM
             IPQ9uBaW99BB9W9JuIih34/qMVxd/1EHDVk3IDiNB3F3bM8f2LL1yA==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2024-05-04T17:38:46Z"
-    mac: ENC[AES256_GCM,data:lN2Dk5GXInYbxuq1POt6DSoPDuxIHKeyA5lPwlVKZHRHTrFmatzIMEYVqHvMgSOML/fuKThhPFhlvC8iUGCy5/qja2P49cFi3EDOSrxR9e9SmEG6FHaoJpNGMjEWNER6J1b8GRmVCvIxFA3t6/LK5zbIodbqWwwzdyNeacr07ag=,iv:5j5gv4OOSPx2x7NugGMNg4dfBPAOEY4xbZNuMhrVRVg=,tag:BFABLQz9R6vM6MbA01ZYLQ==,type:str]
+    lastmodified: "2024-05-11T15:37:59Z"
+    mac: ENC[AES256_GCM,data:FaV8fj4E0YmNRLu6IskpnZMVo5CRcLutZ8et6+b1nYSN5E8LaZCBAh+l0dDtShXob7MVdhUE+HJMSKbEH02ZpZgvCnU6eNCujtLreojg11RqG63vkp+6ZPRIqQ3TUOMJMgOVxT/Dv5lTxRQAG6u1HJGh47SNsl1Aap2ZHeQIcKg=,iv:0DIbkCllaEPI3dTbU99PG8k3j1twnH2i5LoNfLcJpew=,tag:t/pXkGjzohKc9z9NXp6wmQ==,type:str]
     pgp: []
     unencrypted_suffix: _unencrypted
     version: 3.8.1

systems/orangepihole/configuration.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, sops, ... }:
 
 {
   imports =
@@ -36,9 +36,9 @@
     ipv6SendRAConfig.EmitDNS = false;
     ipv6Prefixes = [ { ipv6PrefixConfig.Prefix = "fd72:3dd5:21ae:3c97::/64"; } ];
   };
-
+  sops.age.sshKeyPaths = [ "/persist/etc/ssh/ssh_host_ed25519_key" ];
   zramSwap.enable = true;
-  swapDevices = [ {device="/swapfile"; size=1024;}];
+  swapDevices = [ {device="/persist/swapfile"; size=1024;}];
   services.unbound = {
     enable = true;
     settings = {
@@ -69,10 +69,29 @@
   };
 
 
-  environment.systemPackages = with pkgs; [
+  environment = {
+    systemPackages = with pkgs; [
       vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
       wget
     ];
+    persistence."/persist" = {
+      hideMounts = true;
+      directories = [
+        "/var/lib/nixos"
+        "/var/log"
+        "/var/lib/systemd"
+        "/tmp"
+      ];
+      files = [
+        "/etc/machine-id"
+        "/etc/adjtime"
+        "/etc/ssh/ssh_host_rsa_key"
+        "/etc/ssh/ssh_host_rsa_key.pub"
+        "/etc/ssh/ssh_host_ed25519_key"
+        "/etc/ssh/ssh_host_ed25519_key.pub"
+      ];
+    };
+  };
 
   networking.firewall = {
     allowedUDPPorts = [ 53 67 68 ];
@@ -80,14 +99,21 @@
   };
 
   system.stateVersion = "23.11"; # Did you read the comment?
+  sops.secrets."nixremote/sshkey" = {};
   nix.buildMachines = [ {
     hostName = "zeus";
     systems = [ "x86_64-linux" "aarch64-linux" ];
     protocol = "ssh-ng";
-    sshKey = "/root/.ssh/nixremote";
+    sshKey = config.sops.secrets."nixremote/sshkey".path;
     sshUser = "nixremote";
     supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
   }];
+  programs.ssh.extraConfig = ''
+    Host zeus
+    User nixremote
+    IdentitiesOnly yes
+    IdentityFile ${config.sops.secrets."nixremote/sshkey".path}
+  '';
   nix.distributedBuilds = true;
   nix.settings.max-jobs = 0;
 }

systems/orangepihole/hardware-configuration.nix

@@ -5,7 +5,12 @@
     [ (modulesPath + "/installer/scan/not-detected.nix")
     ];
 
-  fileSystems."/" =
+    fileSystems."/" = {
+      device = "none";
+      fsType = "tmpfs";
+      options = [ "defaults" "mode=755" ];
+    };
+  fileSystems."/persist" =
     { device = "/dev/disk/by-uuid/6df53c4f-42b6-478b-8be4-f7887ad18b5b";
       fsType = "btrfs";
       options = [ "compress=lzo" "autodefrag" "defaults" "subvol=@nixos/root" ];

systems/smolboi/configuration.nix

@@ -130,7 +130,6 @@
       cifs-utils
       tio
     ];
-    pathsToLink = [ "/share/bash-completion" ];
     persistence."/persist" = {
       hideMounts = true;
       directories = [