feat(systems/nemesis): set up basic nemesis configuration

disko.nix

@@ -0,0 +1,71 @@
+{lib, device,...}:
+{
+  boot.initrd.postDeviceCommands = lib.mkAfter ''
+    mkdir /btrfs_tmp
+    mount /dev/root_vg/root /btrfs_tmp
+    if [[ -e /btrfs_tmp/root ]]; then
+        mkdir -p /btrfs_tmp/old_roots
+        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%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 $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+        delete_subvolume_recursively "$i"
+    done
+
+    btrfs subvolume create /btrfs_tmp/root
+    umount /btrfs_tmp
+  '';
+
+  disko.devices.disk.main = {
+    inherit device;
+    type = "disk";
+    content.type = "gpt";
+    content.partitions = {
+      boot.name = "boot";
+      boot.size = "1M";
+      boot.type = "EF02";
+      esp.name = "ESP";
+      esp.size = "500M";
+      esp.type = "EF00";
+      esp.content = {
+        type = "filesystem";
+        format = "vfat";
+        mountpoint = "/boot";
+      };
+			swap.size = "4G";
+			swap.content = {
+				type = "swap";
+				resumeDevice = true;
+			};
+			root.name = "root";
+			root.size = "100%";
+			root.content = {
+				type = "lvm_pv";
+				vg = "root_vg";
+			};
+    };
+  };
+
+	disko.devices.lvm_vg.root_vg = {
+		type = "lvm_vg";
+		lvs.root.size = "100%FREE";
+		lvs.root.content.type = "btrfs";
+		lvs.root.content.extraArgs = ["-f"];
+		lvs.root.content.subvolumes = {
+			"/root".mountpoint = "/";
+			"/persist".mountpoint = "/persist";
+			"/persist".mountOptions = ["subvol=persist" "noatime"];
+			"/nix".mountpoint = "/nix";
+			"/nix".mountOptions = ["subvol=nix" "noatime"];
+		};
+	};
+}