server: add swap

extra-builtins.nix

@@ -4,19 +4,22 @@
     # then decompress it back in a derivation (shouldn't there be a better way...)
     copyToStore = pkgs: name: path:
       let
-        archive = exec [
-          "/bin/sh" "-c"
-          "echo '\"' && (cd /etc/nixos/private && tar -I ${pkgs.zstd}/bin/zstd -c -- ${pkgs.lib.escapeShellArg path} 2>/dev/null | base64 -w0) && echo '\"'"
-        ];
-      in "${pkgs.stdenvNoCC.mkDerivation {
+        archive = exec [ "${pkgs.bash}/bin/bash" "-c" ''
+          cd /etc/nixos/private
+          echo '"'"$(
+            ${pkgs.gnutar}/bin/tar -I ${pkgs.zstd}/bin/zstd --exclude-vcs \
+              --transform='s#'${pkgs.lib.escapeShellArg path}'#!#' \
+              -c -- ${pkgs.lib.escapeShellArg path} | base64 -w0
+          )"'"'
+        '' ];
+      in derivation {
         inherit name;
-        unpackPhase = "true";
-        buildPhase = "true";
-        installPhase = ''
-          mkdir -p $out
-          cd $out
-          echo "${archive}" | base64 -d | tar -I ${pkgs.zstd}/bin/zstd -x
-        '';
-      }}/${toString path}";
+        inherit (pkgs) system;
+        builder = "${pkgs.bash}/bin/bash";
+        args = [ "-c" ''
+          echo '${archive}' | ${pkgs.coreutils}/bin/base64 -d |
+            ${pkgs.gnutar}/bin/tar -P --transform="s#!#$out#" -I ${pkgs.zstd}/bin/zstd -x
+        '' ];
+      };
     };
 }

flake.nix

@@ -326,11 +326,11 @@
           maxSilent = 60 * 60 * 10;
         };
       };
-    in {
-      server.${config.server.system} = addMeta nixosConfigurations.server.config.system.build.toplevel;
-      workstation.${config.nixmsi.system} = addMeta nixosConfigurations.nixmsi.config.system.build.toplevel;
-      router.${config.router-emmc.system} = addMeta nixosConfigurations.router-emmc-cross.config.system.build.toplevel;
-      workstation-home.${config.nixmsi.system} = addMeta homeConfigurations."user@nixmsi".activation-script;
+    in builtins.mapAttrs (_: addMeta) {
+      server.${config.server.system} = nixosConfigurations.server.config.system.build.toplevel;
+      workstation.${config.nixmsi.system} = nixosConfigurations.nixmsi.config.system.build.toplevel;
+      router.${config.router-emmc.system} = nixosConfigurations.router-emmc-cross.config.system.build.toplevel;
+      workstation-home.${config.nixmsi.system} = homeConfigurations."user@nixmsi".activation-script;
     };
   };
 }

system/devices/radxa-rock5a-server.nix

@@ -59,18 +59,33 @@ in
     };
   };
 
-  fileSystems = {
-    "/" =    { device = "none"; fsType = "tmpfs"; neededForBoot = true;
+  fileSystems = let
+    device = rootPart;
+    fsType = "btrfs";
+    neededForBoot = true;
+    compress = "compress=zstd";
+    discard = "discard=async";
+  in {
+    "/" =    { device = "none"; fsType = "tmpfs"; inherit neededForBoot;
                options = [ "defaults" "size=2G" "mode=755" ]; };
     # TODO: switch to bcachefs?
     # I wanna do it some day, but maybe starting with the next disk I get for this server
     "/persist" =
-             { device = rootPart; fsType = "btrfs"; neededForBoot = true;
-               options = [ "subvol=@" "compress=zstd" ]; };
-    "/boot" =
-             { device = bootPart; fsType = "vfat"; neededForBoot = true; };
+              { inherit device fsType neededForBoot;
+                options = [ discard compress "subvol=@" ]; };
+    "/swap" = { inherit device fsType neededForBoot;
+                options = [ discard "subvol=@swap" "noatime" ]; };
+    "/boot" = { device = bootPart; fsType = "vfat"; inherit neededForBoot; };
   };
 
+  swapDevices = [ { device = "/swap/swapfile"; } ];
+
+  boot.kernelParams = [
+    "resume=/@swap/swapfile"
+    # resume_offset = $(btrfs inspect-internal map-swapfile -r path/to/swapfile)
+    "resume_offset=26001976"
+  ];
+
   impermanence = {
     enable = true;
     path = /persist;