From 3c941b4ce2b8dabcb400fca937ff0b70a2927a90 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Sun, 7 Jan 2024 16:43:43 +0000
Subject: [PATCH] partial btrfs support

doesn't actually know how to make the filesystem, just
kernel config and accept it as a valid option
---
 examples/rotuer.nix       |  3 +++
 modules/base.nix          |  1 +
 modules/outputs/btrfs.nix | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 modules/outputs/btrfs.nix

diff --git a/examples/rotuer.nix b/examples/rotuer.nix
index 058eff2..c7890bf 100644
--- a/examples/rotuer.nix
+++ b/examples/rotuer.nix
@@ -43,8 +43,11 @@ in rec {
     ../modules/bridge
     ../modules/ntp
     ../modules/ssh
+    ../modules/outputs/btrfs.nix
+
   ];
   hostname = "rotuer";
+  rootfsType = "btrfs";
 
   services.hostap = svc.hostapd.build {
     interface = config.hardware.networkInterfaces.wlan;
diff --git a/modules/base.nix b/modules/base.nix
index 11357ab..0826ce8 100644
--- a/modules/base.nix
+++ b/modules/base.nix
@@ -40,6 +40,7 @@ in {
     rootfsType =  mkOption {
       default = "squashfs";
       type = types.enum [
+        "btrfs"
         "ext4"
         "jffs2"
         "squashfs"
diff --git a/modules/outputs/btrfs.nix b/modules/outputs/btrfs.nix
new file mode 100644
index 0000000..3617724
--- /dev/null
+++ b/modules/outputs/btrfs.nix
@@ -0,0 +1,37 @@
+{
+  config
+, pkgs
+, lib
+, ...
+}:
+let
+  inherit (lib) mkIf mkOption types;
+  o = config.system.outputs;
+in
+{
+  imports = [
+    ./initramfs.nix
+  ];
+  config = mkIf (config.rootfsType == "btrfs") {
+    kernel.config = {
+      BTRFS_FS = "y";
+    };
+    boot.initramfs.enable = true;
+    system.outputs = {
+      rootfs =
+        let
+          inherit (pkgs.pkgsBuildBuild) runCommand e2fsprogs;
+        in runCommand "mkfs.btrfs" {
+          depsBuildBuild = [ e2fsprogs ];
+        } ''
+          tree=${o.bootablerootdir}
+          size=$(du -s --apparent-size --block-size 1024 $tree |cut -f1)
+          # add 25% for filesystem overhead
+          size=$(( 5 * $size / 4))
+          dd if=/dev/zero of=$out bs=1024 count=$size
+          echo "not implemented" ; exit 1
+          # mke2fs -t ext4 -j -d $tree $out
+        '';
+    };
+  };
+}