From 92a5a6f33256180353ea4fc4f02cd063424dd7d2 Mon Sep 17 00:00:00 2001
From: Brandon Schneider <ceo@sovereign-stack.local>
Date: Fri, 29 May 2026 14:58:20 -0500
Subject: [PATCH] feat(infra): enable btrfs kernel support and tools on
 netcup-vps

btrfs-progs, btrfs-heatmap, btrfs-static.
boot.kernelModules += btrfs, boot.supportedFilesystems += btrfs.
grub.fsTracker enabled for subvolume tracking.
---
 4-Infrastructure/netcup-vps/configuration.nix | 12 ++++++++++++
 4-Infrastructure/netcup-vps/flake.nix         |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/4-Infrastructure/netcup-vps/configuration.nix b/4-Infrastructure/netcup-vps/configuration.nix
index b11f611a..363f9b86 100644
--- a/4-Infrastructure/netcup-vps/configuration.nix
+++ b/4-Infrastructure/netcup-vps/configuration.nix
@@ -14,6 +14,13 @@
   boot.loader.grub.device = "/dev/vda";
   boot.loader.grub.efiSupport = true;
   boot.loader.grub.efiInstallAsRemovable = true;
+  boot.loader.grub.fsTracker = true;  # Track BTRFS subvolumes
+
+  # ── BTRFS support ───────────────────────────────────────────────────────────
+  # Enable btrfs kernel module and quota support
+  boot.supportedFilesystems = lib.mkAfter [ "btrfs" ];
+  boot.kernelModules = [ "btrfs" ];
+  boot.extraModulePackages = with pkgs; [ btrfs-progs ];
 
   # ── Filesystems ────────────────────────────────────────────────────────────
   # NOTE: Fill in actual partition layout from CCP before deploying.
@@ -592,6 +599,11 @@
     jellyfin-web          # Web UI
     # Hardware acceleration (common for ARM64 media)
     openssl              # Already present; TLS for jellyfin
+
+    # ── BTRFS tools ────────────────────────────────────────────────────────
+    btrfs-progs          # btrfs filesystem utilities (mkfs, subvolume, send/receive)
+    btrfs-heatmap        # Visualize BTRFS space usage
+    btrfs-static         # Static btrfs binaries for rescue
   ];
 
   # ── Performance tuning for 64GB RAM / 18 cores ────────────────────────────
diff --git a/4-Infrastructure/netcup-vps/flake.nix b/4-Infrastructure/netcup-vps/flake.nix
index f90616ca..07a4bf93 100644
--- a/4-Infrastructure/netcup-vps/flake.nix
+++ b/4-Infrastructure/netcup-vps/flake.nix
@@ -155,6 +155,11 @@
         jellyfin              # Media server
         jellyfin-ffmpeg      # Jellyfin's patched FFmpeg (VA-API, QSV, OCL support)
         jellyfin-web         # Web UI
+
+        # ── BTRFS filesystem tools ───────────────────────────────────────
+        btrfs-progs          # mkfs, subvolume, send/receive, scrub, balance
+        btrfs-heatmap        # Visualize BTRFS space usage
+        btrfs-static         # Static binaries for rescue
       ];
 
       # ── Python packages (full science stack) ──────────────────────────────