Fix lib arg ref and quoting behavior.

lib.sh

@@ -2,15 +2,15 @@
 
 # Sort these packages by name and split on commas.
 function normalize_package_list {
-  stripped="$(echo \"${0}\" | sed 's/,//g')"
+  stripped=$(echo "${1}" | sed 's/,//g')
   # Remove extraneous spaces at the middle, beginning, and end.
-  trimmed="$(echo \"${stripped}\" | sed 's/\s\+/ /g; s/^\s\+//g; s/\s\+$//g')"  
-  echo "$(\"${trimmed}\" | sort)"
+  trimmed="$(echo "${stripped}" | sed 's/\s\+/ /g; s/^\s\+//g; s/\s\+$//g')"  
+  echo "$(echo "${trimmed}" | sort)"
 }
 
 # Split fully qualified package into name and version
 function get_package_name_ver {
-  IFS=\= read name ver <<< "${0}"
+  IFS=\= read name ver <<< "${1}"
   # If version not found in the fully qualified package value.
   if test -z "${ver}"; then
     ver="$(grep "Version:" <<< "$(apt show ${name})" | awk '{print $2}')"

pre_cache_action.sh

@@ -5,10 +5,10 @@ script_dir="$(dirname -- "$(realpath -- "${0}")")"
 source "${script_dir}/lib.sh"
 
 # Directory that holds the cached packages.
-cache_dir=${1}
+cache_dir="${1}"
 
 # Version of the cache to create or load.
-version=${2}
+version="${2}"
 
 # List of the packages to use.
 input_packages="${@:3}"