fix: improve ble.sh build

overlays/blesh.nix

@@ -3,17 +3,33 @@ final: prev: {
     inherit (prev.sources.blesh-nvfetcher) version src;
 
     dontBuild = false;
-    buildInputs = [prev.git];
+    buildInputs = [
+      prev.gitMinimal
+    ];
+
     patchPhase = ''
       substituteInPlace GNUmakefile \
         --replace "git submodule update --init --recursive" ""
     '';
-    nativeCheckInputs = oldAttrs.nativeCheckInputs ++ [prev.busybox];
+
+    installFlags = [
+      "PREFIX=$(out)"
+    ];
 
     installPhase = ''
-      runHook preInstall
+      source $stdenv/setup
+      installPhase
+    '';
 
-      mkdir -p "$out/share/blesh/lib"
+    postInstall = ''
+      mkdir -p "$out/bin"
+      cat <<EOF >"$out/bin/blesh-share"
+      #!${prev.runtimeShell}
+      # Run this script to find the ble.sh shared folder
+      # where all the shell scripts are living.
+      echo "$out/share/blesh"
+      EOF
+      chmod +x "$out/bin/blesh-share"
 
       cat <<EOF >"$out/share/blesh/lib/_package.sh"
       _ble_base_package_type=nix
@@ -23,10 +39,6 @@ final: prev: {
         return 1
       }
       EOF
-
-      make install INSDIR=$out/share/blesh
-
-      runHook postInstall
     '';
   });
 }