add the dynamic nixGL wrapper

Author: cfhammill

dynamicWrapper.nix

@@ -0,0 +1,43 @@
+{
+  pkgs,
+  writeTextFile,
+  runtimeShell,
+  gnugrep,
+  gnused,
+  shellcheck,
+  pcre
+}:
+
+writeTextFile rec {
+  name = "nixGL";
+  text = ''#!${runtimeShell}
+
+  driver_file=/proc/driver/nvidia/version
+
+  vers=$(${gnugrep}/bin/grep "Module" "$driver_file"  |\
+        ${gnused}/bin/sed -E "s/.*Module  ([0-9.]+)  .*/\1/")
+  if [ -z "$vers" ]; then
+    echo "Failed to parse your driver version from $driver_file. Does $driver_file exist?"
+    echo "Consider using nixGLNvidia-<version> directly instead."
+    exit 1
+  fi
+
+  if ! command -v nixGLNvidia-"$vers" &> /dev/null; then
+    echo "nixGLNvidia wrapper not found for $vers"
+    exit 1
+  fi
+
+  exec nixGLNvidia-"$vers" "$@"
+  '';
+  executable = true;
+  destination = "/bin/${name}";
+  checkPhase = ''
+  ${shellcheck}/bin/shellcheck "$out/bin/${name}"
+
+  # Check that all the files listed in the output binary exists
+  for i in $(${pcre}/bin/pcregrep  -o0 '/nix/store/.*?/[^ ":]+' $out/bin/${name})
+  do
+    ls $i > /dev/null || (echo "File $i, referenced in $out/bin/${name} does not exists."; exit -1)
+  done
+  '';
+}

flake.nix

@@ -13,6 +13,7 @@
           enable32bits = isIntelX86Platform;
           enableIntelX86Extensions = isIntelX86Platform;
         };
+
       in rec {
 
         packages = {
@@ -39,6 +40,8 @@
               pkgs = final;
               enable32bits = isIntelX86Platform;
               enableIntelX86Extensions = isIntelX86Platform;
+            } // {
+              nixGLDynamic = final.callPackage ./dynamicWrapper.nix {};
             };
           };
       };