ln does not seem to work with codon cache

lib/cache.sh

@@ -75,8 +75,8 @@ save_cache_directories() {
   for cachepath in ${@:3}; do
     if [ -e "$build_dir/$cachepath" ]; then
       echo "- $cachepath"
-      mkdir -p $(dirname "$cache_dir/node/$cachepath")
-      ln -s "$build_dir/$cachepath" "$cache_dir/node/$cachepath"
+      mkdir -p "$cache_dir/node/$cachepath"
+      cp -a "$build_dir/$cachepath" $(dirname "$cache_dir/node/$cachepath")
     else
       echo "- $cachepath (nothing to cache)"
     fi

test/run

 #!/usr/bin/env bash
 # See README.md for info on running these tests.
 
+testModulesCheckedIn() {
+  cache=$(mktmpdir)
+  compile "modules-checked-in" $cache
+  assertCapturedSuccess
+
+  compile "modules-checked-in" $cache
+  assertCaptured "Prebuild detected"
+  assertCaptured "Rebuilding any native modules"
+  assertCaptured "(preinstall script)"
+  assertCaptured "Installing any new modules"
+  assertCaptured "(postinstall script)"
+  assertNotCaptured "Pruning any extraneous modules"
+  assertCapturedSuccess
+}
+
 testDisableCache() {
   cache=$(mktmpdir)
   env_dir=$(mktmpdir)
@@ -235,20 +250,6 @@ testBuildWithUserCacheDirectoriesCamel() {
   assertCapturedSuccess
 }
 
-testModulesCheckedIn() {
-  cache=$(mktmpdir)
-  compile "modules-checked-in" $cache
-  assertCapturedSuccess
-
-  compile "modules-checked-in" $cache
-  assertCaptured "Prebuild detected"
-  assertCaptured "Rebuilding any native modules"
-  assertCaptured "(preinstall script)"
-  assertCaptured "Installing any new modules"
-  assertCaptured "(postinstall script)"
-  assertCapturedSuccess
-}
-
 testUserConfig() {
   compile "userconfig"
   assertCaptured "www.google.com"