subsurface: 5.0.10 -> 6.0.5231

subsurface changed from tagged releases to nightly builds
from which a somewhat stable release is marked as a "weekly release"
which is published on subsurface-divelog.org
Currently there is no tag on the main repository pointing
to the commit that was used to create the nightly build
that was finally selected as the "weekly release".

Upstream Documentation:
- https://github.com/subsurface/subsurface/releases/tag/v4.9.4
- https://github.com/subsurface/nightly-builds/releases
- https://subsurface-divelog.org/current-release/

pkgs/applications/misc/subsurface/default.nix

@@ -25,16 +25,17 @@
 , qtwebengine
 , libXcomposite
 , bluez
+, writeScript
 }:
 
 let
-  version = "5.0.10";
+  version = "6.0.5231";
 
   subsurfaceSrc = (fetchFromGitHub {
     owner = "Subsurface";
     repo = "subsurface";
-    rev = "v${version}";
-    hash = "sha256-KzUBhFGvocaS1VrVT2stvKrj3uVxYka+dyYZUfkIoNs=";
+    rev = "38a0050ac33566dfd34bf94cf1d7ac66034e4118";
+    hash = "sha256-6fNcBF/Ep2xs2z83ZQ09XNb/ZkhK1nUNLChV1x8qh0Y=";
     fetchSubmodules = true;
   });
 
@@ -136,7 +137,25 @@ stdenv.mkDerivation {
     "-DNO_PRINTING=OFF"
   ];
 
-  passthru = { inherit version libdc googlemaps; };
+  passthru = {
+    inherit version libdc googlemaps;
+    updateScript = writeScript "update-subsurface" ''
+      #!/usr/bin/env nix-shell
+      #!nix-shell -i bash -p git common-updater-scripts
+
+      set -eu -o pipefail
+      tmpdir=$(mktemp -d)
+      pushd $tmpdir
+      git clone -b current https://github.com/subsurface/subsurface.git
+      cd subsurface
+      # this returns 6.0.????-local
+      new_version=$(./scripts/get-version.sh | cut -d '-' -f 1)
+      new_rev=$(git rev-list -1 HEAD)
+      popd
+      update-source-version subsurface "$new_version" --rev="$new_rev"
+      rm -rf $tmpdir
+    '';
+  };
 
   meta = with lib; {
     description = "Divelog program";