1 files changed, 32 insertions, 0 deletions
diff --git a/nixos/modules/tasks/filesystems/unionfs-fuse.nix b/nixos/modules/tasks/filesystems/unionfs-fuse.nix
new file mode 100644
index 00000000000..f54f3559c34
--- /dev/null
+++ b/nixos/modules/tasks/filesystems/unionfs-fuse.nix
@@ -0,0 +1,32 @@
+{ config, pkgs, lib, ... }:
+
+{
+  config = lib.mkMerge [
+
+    (lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.initrd.supportedFilesystems) {
+      boot.initrd.kernelModules = [ "fuse" ];
+
+      boot.initrd.extraUtilsCommands = ''
+        copy_bin_and_libs ${pkgs.fuse}/sbin/mount.fuse
+        copy_bin_and_libs ${pkgs.unionfs-fuse}/bin/unionfs
+        substitute ${pkgs.unionfs-fuse}/sbin/mount.unionfs-fuse $out/bin/mount.unionfs-fuse \
+          --replace '${pkgs.bash}/bin/bash' /bin/sh \
+          --replace '${pkgs.fuse}/sbin' /bin \
+          --replace '${pkgs.unionfs-fuse}/bin' /bin
+        chmod +x $out/bin/mount.unionfs-fuse
+      '';
+
+      boot.initrd.postDeviceCommands = ''
+          # Hacky!!! fuse hard-codes the path to mount
+          mkdir -p /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.util-linux.name}-bin/bin
+          ln -s $(which mount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.util-linux.name}-bin/bin
+          ln -s $(which umount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.util-linux.name}-bin/bin
+        '';
+    })
+
+    (lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.supportedFilesystems) {
+      system.fsPackages = [ pkgs.unionfs-fuse ];
+    })
+
+  ];
+}