symlinkJoin: print warning when keeping existing file

1 files changed, 2 insertions, 2 deletions

diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index d8aa6c232444..7318d13f6bab 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -509,8 +509,8 @@ rec {
       ''
         mkdir -p $out
         for i in $(cat $pathsPath); do
-          ${lndir}/bin/lndir -silent $i $out
-        done
+          ${lndir}/bin/lndir $i $out
+        done 2>&1 | sed 's/^/symlinkJoin: warning: keeping existing file: /'
         ${postBuild}
       '';