lets try it out i001 bcache

hosts/i001/hardware-mounts.nix

@@ -0,0 +1,68 @@
+{ ... }:
+let
+  BOOT = "/dev/disk/by-uuid/6E40-637E";
+  PRIMARY = "/dev/disk/by-uuid/ec589da0-4deb-44a3-abcb-9a7016d84519";
+
+  USB_KEY = "/dev/disk/by-uuid/9985-EBD1";
+in
+{
+  # BOOT
+  fileSystems."/boot" = {
+    device = BOOT;
+    fsType = "vfat";
+  };
+
+  # PRIMARY unencrypt
+  # TODO how to auto unencrypt with options...
+  # - USB key
+  # - TPM
+
+  # PRIMARY
+  fileSystems."/" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@root"
+    ];
+  };
+  fileSystems."/nix" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@nix"
+      "relatime"
+    ];
+  };
+  fileSystems."/.swap" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@swap"
+      "noatime"
+    ];
+  };
+  fileSystems."/.snapshots" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@root"
+      "relatime"
+    ];
+  };
+  # (optional) for preservation/impermanence
+  fileSystems."/persist" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@persist"
+    ];
+  };
+
+  # SWAP
+  swapDevices = [
+    {
+      device = "/.swap/swapfile";
+      size = 8 * 1024; # Creates an 8GB swap file
+    }
+  ];
+}