diff --git a/justfile b/justfile
index 2823865..ad30c48 100644
--- a/justfile
+++ b/justfile
@@ -1,8 +1,6 @@
 #!/usr/bin/env just --justfile
 # makes variables accesible as $1 $2 $@, useful for escaping variadics
 
-# TODO: something with NIX_SHOW_STATS=1 NIX_COUNT_CALLS=1 nix-instantiate . -A ....
-
 set positional-arguments := true
 
 export invokedir := invocation_directory()
@@ -324,8 +322,8 @@ _build_package_sources $system +packages:
         result_writeable=results-src-writeable/"$(basename "$result")"
         mkdir -p "$result_writeable"
         if [[ -d "$(readlink "$result")" ]]; then
-            rsync -rxL "$result/" "$result_writeable/" &&
-            chmod -R +w "$result_writeable/" ||:
+            rsync -rxL --chmod=ugo+w "$result/" "$result_writeable/" ||:
+            #chmod -R +w "$result_writeable/"
         elif [[ -f "$(readlink "$result")" ]]; then
             atool "$(readlink "$result")" --extract-to="$result_writeable/" ||:
             if [[ $(ls --almost-all "$result_writeable" | wc -l ) -eq 1 ]] && test -d "$result_writeable"/*; then
diff --git a/overlays.nix b/overlays.nix
index 7a66b76..b9556a4 100755
--- a/overlays.nix
+++ b/overlays.nix
@@ -60,7 +60,7 @@ let
 
   # none of these overlays should cause a mass-rebuild, they should only add optional functionality
 
-  # TODO: cccache and sccache
+  # TODO: reduce eval time addition, any faster ways to override mkDerivation?
   # TODO: mkDerivation.passthru.withOil: add <package>.withOil which run build with osh, https://oils.pub/osh.html#2-you-get-precise-error-messages
   # TODO: mkDerivation.passthru.withGDB: add <package>.withGDB which runs the full build with gdb
   # TODO: mkDerivation.passthru.withDebInfo: like overlay.withDebug but with cmakeBuildType = "RelWithDebInfo" mode
@@ -236,6 +236,7 @@ let
   );
 
   # TODO: this way of overriding does not work
+  # Not a treewide enable, just for a single derivation
   # usage: nix-build . -A <package>.withCuda
   # usage: nix-build . -A <package>.withRocm
   overlays.withCudaOrRocm = final: prev: {
@@ -318,10 +319,10 @@ let
         export CCACHE_SLOPPINESS=random_seed
 
         if [[ ! -d "$CCACHE_DIR" ]]; then
-          echo "ERROR: \$CCACHE_DIR=$CCACHE_DIR not found!"
+          echo >&2 "ERROR: \$CCACHE_DIR=$CCACHE_DIR not found!"
           exit 1
         elif [[ ! -w "$CCACHE_DIR" ]]; then
-          echo "ERROR: \$CCACHE_DIR=$CCACHE_DIR not writeable!"
+          echo >&2 "ERROR: \$CCACHE_DIR=$CCACHE_DIR not writeable!"
           exit 1
         fi
       '';