Refactoring

hardware/filesystem.nix

@@ -0,0 +1,63 @@
+{ config, lib, pkgs, modulesPath, hostname, ... }:
+
+let
+rootDisk = "/dev/disk/by-partlabel/disk-${hostname}-root";
+bootDisk = "/dev/disk/by-partlabel/disk-${hostname}-ESP";
+in
+
+{
+    boot.initrd.postDeviceCommands = lib.mkAfter ''
+        mkdir /btrfs_tmp
+        mount ${rootDisk} /btrfs_tmp
+        if [[ -e /btrfs_tmp/root ]]; then
+            mkdir -p /btrfs_tmp/old_roots
+            timestamp=$(date +%Y-%m-%d_%H-%M-%S)
+            mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
+        fi
+
+        delete_subvolume_recursively() {
+            IFS=$'\n'
+            for i in $(btrfs subvolume list -o "$1" | cut -f 9 -d ' '); do
+                delete_subvolume_recursively "/btrfs_tmp/$i"
+            done
+            btrfs subvolume delete "$1"
+        }
+
+        for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +7); do
+            delete_subvolume_recursively "$i"
+        done
+
+        btrfs subvolume create /btrfs_tmp/root
+        umount /btrfs_tmp
+    '';
+
+    fileSystems."/" = {
+        device = rootDisk;
+        fsType = "btrfs";
+        options = [ "subvol=root" ];
+    };
+
+    fileSystems."/persist" = {
+        device = rootDisk;
+        neededForBoot = true;
+        fsType = "btrfs";
+        options = [ "subvol=persist" ];
+    };
+
+    fileSystems."/nix" = {
+        device = rootDisk;
+        neededForBoot = true;
+        fsType = "btrfs";
+        options = [ "subvol=nix" ];
+    };
+
+    fileSystems."/boot" = {
+        device = bootDisk;
+        fsType = "vfat";
+        options = [ "fmask=0022" "dmask=0022" "umask=0077" ];
+    };
+
+    swapDevices = [ {
+        device = "/.swapvol/swapfile";
+    } ];
+}