nixos/bcachefs: init module

nixos/modules/module-list.nix

@@ -679,6 +679,7 @@
   ./tasks/cpu-freq.nix
   ./tasks/encrypted-devices.nix
   ./tasks/filesystems.nix
+  ./tasks/filesystems/bcachefs.nix
   ./tasks/filesystems/btrfs.nix
   ./tasks/filesystems/cifs.nix
   ./tasks/filesystems/exfat.nix

nixos/modules/system/boot/stage-1-init.sh

@@ -221,6 +221,9 @@ checkFS() {
     # Don't check resilient COWs as they validate the fs structures at mount time
     if [ "$fsType" = btrfs -o "$fsType" = zfs ]; then return 0; fi
 
+    # Skip fsck for bcachefs - not implemented yet.
+    if [ "$fsType" = bcachefs ]; then return 0; fi
+
     # Skip fsck for inherently readonly filesystems.
     if [ "$fsType" = squashfs ]; then return 0; fi
 

nixos/modules/tasks/filesystems/bcachefs.nix

@@ -0,0 +1,26 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  inInitrd = any (fs: fs == "bcachefs") config.boot.initrd.supportedFilesystems;
+
+in
+
+{
+  config = mkIf (any (fs: fs == "bcachefs") config.boot.supportedFilesystems) {
+
+    system.fsPackages = [ pkgs.bcachefs-tools ];
+
+    # use kernel package with bcachefs support until it's in mainline
+    boot.kernelPackages = pkgs.linuxPackages_testing_bcachefs;
+    boot.initrd.availableKernelModules = mkIf inInitrd [ "bcachefs" ];
+
+    boot.initrd.extraUtilsCommands = mkIf inInitrd
+      ''
+        copy_bin_and_libs ${pkgs.bcachefs-tools}/bin/fsck.bcachefs
+      '';
+
+  };
+}