use symlink not copying for cache-use

Author: mohawk2

README.md

@@ -303,14 +303,12 @@ Commands
           - git clone git://github.com/travis-perl/helpers ~/travis-perl-helpers
           - source ~/travis-perl-helpers/init
           - build-perl
-          - local-lib cache # makes a local::lib from cached
+          - local-lib cache # makes a local::lib symlinked to cache
           - perl -V
           - build-dist
           - cd $BUILD_DIR
         install:
           - cpan-install --deps # installs prereqs, including recommends
-        before_cache:
-          - local-lib-cachestore # saves for local::lib next time
 
     Alternatively, this will also work and the `build-perl` will do the
     `local-lib` step for you:

bin/local-lib-cache

@@ -27,14 +27,10 @@ set -e
 if [ "$1" == "use" ]; then
   perlbrew lib create "$full_version"
   perlbrew use "$full_version"
-  mkdir -p "$perlbrew_location"
-  cp -pr "$cache_location"/* "$perlbrew_location"
-elif [ "$1" == "store" ]; then
-  id
-  echo "BEFORE"; find "$perlbrew_location" "$cache_location" -ls
-  mkdir -p "$cache_location"
-  cp -pr "$perlbrew_location"/* "$cache_location"
-  echo "AFTER"; find "$cache_location" -ls
+  rm -rf "$perlbrew_location"
+  ln -s "$cache_location" "$perlbrew_location"
+  [ -n "$TRAVIS_PERL_DEBUG" ] && \
+    (id; echo "ON USE"; find "$perlbrew_location" "$cache_location" -ls)
 else
   echo "Unknown arg '$1'"
   exit 1

init

@@ -53,10 +53,6 @@ function local-lib {
   eval "$("$HELPERS_ROOT/bin/local-lib" "$@")"
 }
 
-function local-lib-cachestore {
-  $HELPERS_ROOT/bin/local-lib-cache store
-}
-
 function build-perl {
   local TRAVIS_PERL_VERSION="$TRAVIS_PERL_VERSION"
   if [[ ( "$TRAVIS_PERL_VERSION" =~ ^5\.6[.-] || \