dockerTools: Fix streamLayeredImage for symlinks

When archiving `/nix/store/foo` and `foo` is itself a symlink, we must
not traverse the symlink target, but archive the `foo` symlink itself

1 files changed, 5 insertions, 1 deletions

diff --git a/pkgs/build-support/docker/stream_layered_image.py b/pkgs/build-support/docker/stream_layered_image.py
index cbae0f723f9..e35bd0b0e8c 100644
--- a/pkgs/build-support/docker/stream_layered_image.py
+++ b/pkgs/build-support/docker/stream_layered_image.py
@@ -83,7 +83,11 @@ def archive_paths_to(obj, paths, mtime):
 
         for path in paths:
             path = pathlib.Path(path)
-            files = itertools.chain([path], path.rglob("*"))
+            if path.is_symlink():
+                files = [path]
+            else:
+                files = itertools.chain([path], path.rglob("*"))
+
             for filename in sorted(files):
                 ti = append_root(tar.gettarinfo(filename))