Preserve cached asset ownership while expanding paths

CHANGELOG.md

@@ -1,5 +1,7 @@
 **Master**
 
+- Preserve cached asset ownership while expanding paths. [Oskar Eichler](https://github.com/OskarEichler)
+
 Get upgrade notes from Sprockets 3.x to 4.x at https://github.com/rails/sprockets/blob/master/UPGRADING.md
 
 # 4.4.1

README.md

@@ -714,3 +714,5 @@ Please see the [CHANGELOG](https://github.com/rails/sprockets/tree/master/CHANGE
 
 ## License
 Sprockets is released under the [MIT License](MIT-LICENSE).
+
+Loading a cached asset expands its paths on a copy, preserving reusable cache entries across application roots.

lib/sprockets/loader.rb

@@ -111,6 +111,8 @@ def expand_key_from_hash(hash, key)
       def asset_from_cache(key)
         asset = cache.get(key, true)
         if asset
+          asset = asset.dup
+          asset[:metadata] = asset[:metadata].dup
           asset[:uri]       = expand_from_root(asset[:uri])
           asset[:load_path] = expand_from_root(asset[:load_path])
           asset[:filename]  = expand_from_root(asset[:filename])