anchor.diff:  export USE_LOCAL=true
   export LOCAL_PATH=..
   function install_berkshelves {
  -  echo "Installing cookbooks at $1"
  +  ${2:-echo} "Installing cookbooks at $1"
     for name in $HOMEBASES; do
       switch_to $name
       ensure_bundle > /dev/null
  
positive.code: }
  
  function ensure_bundle {
    level=$2; if [ ! $level ]; then level='echo'; fi
    if ! bundle check; then
      $level "Installing bundle"
      PARAMS="--path $SHARED_DIR --no-color"
      # Only install from source if cache fails
      bundle install $PARAMS --local || bundle install $PARAMS
  
negative.code: }
  
  function change_all_branches {
    ${2:-echo} "Switching to $1 on all repos"
    for name in $ALL_PATHS; do
      switch_to $name
      git checkout -f $1 2> /dev/null
  