diskoConfigs/external-hdd: init

configs/disko/external-hdd/default.nix

@@ -0,0 +1,69 @@
+# A simple external HDD filesystem primarily used as a persistent live
+# installer. We're using btrfs since we don't have any significant work with
+# other systems for now so we can afford to do this.
+{ disk ? "/dev/sda", ... }:
+
+{
+  disko.devices = {
+    disk.live-installer = {
+      device = disk;
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          # You can't really have a btrfs-layered boot so this'll have to do.
+          ESP = {
+            priority = 1;
+            start = "0";
+            end = "256MiB";
+            type = "EF00";
+            content = {
+              type = "filesystem";
+              mountpoint = "/boot";
+              format = "vfat";
+            };
+          };
+
+          # Just a tiny swap partition. This should have a remaining budget of
+          # (X - 7GB) for our custom data. To allows us to have a buffer which
+          # is especially useful for our potato laptop.
+          swap = {
+            start = "-6GiB";
+            end = "-0";
+            type = "8200";
+            content = {
+              type = "swap";
+              randomEncryption = true;
+            };
+          };
+
+          # The end-all-be-all partition. Contains the treasure trove of data.
+          # Be mindful!
+          root = {
+            size = "100%";
+            type = "8300";
+            content = {
+              type = "btrfs";
+              extraArgs = [ "-f" ];
+
+              subvolumes = {
+                "/root" = {
+                  mountOptions = [ "compress=zstd:6" ];
+                  mountpoint = "/";
+                };
+                "/home".mountpoint = "/home";
+                "/nix" = {
+                  mountOptions = [ "compress=zstd:6" "noatime" "noacl" ];
+                  mountpoint = "/nix";
+                };
+
+                # Where the data where will be stored.
+                "/data".mountpoint = "/data";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}