From 2a93f24a58da6c70c8e803a6e8eb1397a24c8e71 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Fri, 5 Jan 2024 00:07:01 +0000
Subject: [PATCH] add turris "schnapps" tool

in its current state this is useful for turris omnia only, but will
allow us to do installs and rollback to turris os if needed.
---
 modules/schnapps/default.nix | 19 +++++++++++++++++++
 pkgs/default.nix             |  7 +++++++
 pkgs/schnapps/default.nix    | 27 +++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 modules/schnapps/default.nix
 create mode 100644 pkgs/schnapps/default.nix

diff --git a/modules/schnapps/default.nix b/modules/schnapps/default.nix
new file mode 100644
index 0000000..5bf0aa8
--- /dev/null
+++ b/modules/schnapps/default.nix
@@ -0,0 +1,19 @@
+{ config, pkgs, lib, ... } :
+{
+  config = {
+    programs.busybox = {
+      options = {
+        # schnapps is a shell script that needs
+        # [ command
+        # find -maxdepth  -mindepth
+        # head -c
+        # echo -n
+        ASH_TEST = "y";
+        FEATURE_FIND_MAXDEPTH = "y";
+        FEATURE_FANCY_HEAD = "y";
+        FEATURE_FANCY_ECHO = "y";
+      };
+    };
+    defaultProfile.packages = [ pkgs.schnapps ] ;
+  };
+}
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 2ad956b..823d560 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -92,6 +92,13 @@ in {
   run-liminix-vm = callPackage ./run-liminix-vm {};
   s6-init-bin =  callPackage ./s6-init-bin {};
   s6-rc-database = callPackage ./s6-rc-database {};
+
+  # schnapps is written by Turris and provides a high-level interface
+  # to btrfs snapshots. It may be useful on the Turris Omnia to
+  # install Liminix while retaining the ability to rollback to the
+  # vendor OS, or even to derisk Liminix updates on that device
+  schnapps = callPackage ./schnapps {};
+
   serviceFns = callPackage ./service-fns {};
   swconfig = callPackage ./swconfig {};
   systemconfig = callPackage ./systemconfig {};
diff --git a/pkgs/schnapps/default.nix b/pkgs/schnapps/default.nix
new file mode 100644
index 0000000..b5ac8be
--- /dev/null
+++ b/pkgs/schnapps/default.nix
@@ -0,0 +1,27 @@
+{
+  stdenv
+, fetchFromGitLab
+, makeWrapper
+, btrfs-progs
+, lib
+}:
+let search_path = lib.makeBinPath [btrfs-progs];
+in stdenv.mkDerivation {
+  pname = "schnapps";
+  version = "2.13.0";
+
+  src =fetchFromGitLab {
+    domain = "gitlab.nic.cz";
+    owner = "turris";
+    repo = "schnapps";
+    rev = "53ac92c765d670be4b98dba2c948859a9ac7607f";
+    hash = "sha256-yVgXK+V2wrcOPLB6X6qm3hyBcWcyzNhfJjFF7YRk5Lc=";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildPhase = ":";
+  installPhase = ''
+    install -D schnapps.sh $out/bin/schnapps
+    wrapProgram $out/bin/schnapps --prefix PATH : "${search_path}"
+  '';
+}