From ba9ef3913df75d5ddafdf4d2964d410215527133 Mon Sep 17 00:00:00 2001
From: Dominik Polakovics <dominik.polakovics@cloonar.com>
Date: Tue, 5 Aug 2025 19:52:58 +0200
Subject: [PATCH] feat: change iso to btrfs

---
 iso/default.nix                | 18 +++++++++++++---
 iso/hardware-configuration.nix | 39 ++++++++++++++++++++++++++++++----
 iso/result                     |  2 +-
 3 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/iso/default.nix b/iso/default.nix
index 82cc1ef..6cc200d 100644
--- a/iso/default.nix
+++ b/iso/default.nix
@@ -33,7 +33,7 @@
 					${utillinux}/bin/sfdisk --wipe=always $dev <<-END
 						label: gpt
 
-						name=BOOT, size=512MiB, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B
+						name=BOOT, size=1024MiB, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B
 						name=NIXOS
 					END
 					mkfs.fat -F 32 -n boot /dev/disk/by-partlabel/BOOT
@@ -44,10 +44,22 @@
 					wait-for mkfs.fat -F 32 -n boot /dev/disk/by-partlabel/BOOT
 
 					wait-for [ -b /dev/disk/by-partlabel/NIXOS ]
-					mkfs.ext4 -L nixos /dev/disk/by-partlabel/NIXOS
+					mkfs.btrfs -f -L nixos /dev/disk/by-partlabel/NIXOS
 
 					sync
-					mount /dev/disk/by-partlabel/NIXOS /mnt
+          mount /dev/disk/by-partlabel/NIXOS /mnt
+
+          btrfs subvolume create /mnt/@
+          btrfs subvolume create /mnt/@nix-store
+          btrfs subvolume create /mnt/@nix-persist
+
+          umount /mnt
+
+					sync
+          mount -o noatime,compress=zstd:3,ssd,discard=async,space_cache=v2,subvol=@ /dev/disk/by-partlabel/NIXOS /mnt
+          mkdir -p /mnt/nix/{store,persist}
+          mount -o noatime,compress=zstd:3,ssd,discard=async,space_cache=v2,subvol=@nix-store /dev/disk/by-partlabel/NIXOS /mnt/nix/store
+          mount -o noatime,compress=zstd:3,ssd,discard=async,space_cache=v2,subvol=@nix-persist /dev/disk/by-partlabel/NIXOS /mnt/nix/persist
 
 					mkdir /mnt/boot
 					wait-for mount /dev/disk/by-label/boot /mnt/boot
diff --git a/iso/hardware-configuration.nix b/iso/hardware-configuration.nix
index 218de10..9ccd886 100644
--- a/iso/hardware-configuration.nix
+++ b/iso/hardware-configuration.nix
@@ -6,8 +6,39 @@
 		fsType = "vfat";
 	};
 
-	fileSystems."/" = {
-		device = "/dev/disk/by-partlabel/NIXOS";
-		fsType = "ext4";
-	};
+  fileSystems."/"  = {
+    device = "/dev/disk/by-partlabel/NIXOS";
+    fsType = "btrfs";
+    options = [
+      "subvol=@"
+      "ssd"
+      "compress=zstd:3"
+      "discard=async"
+      "noatime"
+    ];
+  };
+
+  fileSystems."/nix/store" = {
+    device = "/dev/disk/by-uuid/…";
+    fsType = "btrfs";
+    options = [
+      "subvol=@nix-store"
+      "ssd"
+      "compress=zstd:3"
+      "discard=async"
+      "noatime"
+    ];
+  };
+
+  fileSystems."/nix/persist"  = {
+    device = "/dev/disk/by-partlabel/NIXOS";
+    fsType = "btrfs";
+    options = [
+      "subvol=@nix-persist"
+      "ssd"
+      "compress=zstd:3"
+      "discard=async"
+      "noatime"
+    ];
+  };
 }
diff --git a/iso/result b/iso/result
index b04a57f..eea6ebc 120000
--- a/iso/result
+++ b/iso/result
@@ -1 +1 @@
-/nix/store/awr76nk2v9gambbksl4lj2z1f30b595i-nixos-23.05.4974.d2e4de209881-x86_64-linux.iso
\ No newline at end of file
+/nix/store/w455axi159v2i9csmq4cryqq6kxwvzr1-nixos-minimal-25.05.807313.59e69648d345-x86_64-linux.iso
\ No newline at end of file