Reorganize configuration root

While I might still bikeshed how the rest of the configuration is
sourced, at least the import points should be stable.

pindakaas_sd/disko.nix

@@ -0,0 +1,101 @@
+{
+  disko.devices = {
+    disk = {
+      pindakaas_sd = {
+        type = "disk";
+        device = "/dev/disk/by-id/mmc-SN32G_0xfb19ae99";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              # Needs enough to store multiple kernel generations
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [
+                  "defaults"
+                ];
+              };
+            };
+            root = {
+              size = "100%";
+              # content = {
+              #   type = "filesystem";
+              #   format = "ext4";
+              #   mountpoint = "/";
+              # };
+              content = {
+                type = "btrfs";
+                extraArgs = [ "-f" ];
+                subvolumes = {
+                  "/nixos" = {
+                    mountpoint = "/";
+                    mountOptions = [ "compress=zstd" "noatime" ];
+                  };
+                  "/home" = {
+                    mountpoint = "/home";
+                    mountOptions = [ "compress=zstd" "relatime" ];
+                  };
+                  "/nix" = {
+                    mountpoint = "/nix";
+                    mountOptions = [ "compress=zstd" "noatime" ];
+                  };
+                  # Maybe later
+                  # "/swap" = {
+                  #   mountpoint = "/.swapvol";
+                  #   swap.swapfile.size = "20M";
+                  # };
+                };
+            };
+            };
+            # FIXME Hang on Linux boot, for some reason
+            # luks = {
+            #   size = "100%";
+            #   content = {
+            #     type = "luks";
+            #     name = "pindakaas_sd";
+            #     # disable settings.keyFile if you want to use interactive password entry
+            #     #passwordFile = "/tmp/secret.key"; # Interactive
+            #     settings = {
+            #       # Not having SSDs die fast is more important than crypto
+            #       # nerds that could potentially discover which filesystem I
+            #       # use from TRIM patterns
+            #       allowDiscards = true;
+            #       # keyFile = "/tmp/secret.key";
+            #       fallbackToPassword = true; # TEST
+            #     };
+            #     # additionalKeyFiles = [ "/tmp/additionalSecret.key" ];
+            #     content = {
+            #       type = "btrfs";
+            #       extraArgs = [ "-f" ];
+            #       subvolumes = {
+            #         "/nixos" = {
+            #           mountpoint = "/";
+            #           mountOptions = [ "compress=zstd" "noatime" ];
+            #         };
+            #         "/home" = {
+            #           mountpoint = "/home";
+            #           mountOptions = [ "compress=zstd" "relatime" ];
+            #         };
+            #         "/nix" = {
+            #           mountpoint = "/nix";
+            #           mountOptions = [ "compress=zstd" "noatime" ];
+            #         };
+            #         # Maybe later
+            #         # "/swap" = {
+            #         #   mountpoint = "/.swapvol";
+            #         #   swap.swapfile.size = "20M";
+            #         # };
+            #       };
+            #     };
+            #   };
+            # };
+          };
+        };
+      };
+    };
+  };
+}

pindakaas_sd/options.nix

@@ -0,0 +1,6 @@
+{ ... }:
+{
+  # Barebones is faster to test partition schemes
+  frogeye.dev.ansible = false;
+  frogeye.dev.python = false;
+}

pindakaas_sd/os.nix

@@ -0,0 +1,11 @@
+{ pkgs, config, ... }:
+{
+  imports = [
+    ../os
+    ../pindakaas/hardware.nix
+    ./disko.nix
+    ./options.nix
+  ];
+
+  networking.hostName = "pindakaas_sd";
+}