new: [compose-core] add code improvements !minor

bin/compose-core

@@ -2398,8 +2398,8 @@ export -f get_compose_relations
 
 
 get_all_services() {
-    local cache_file="$state_tmpdir/$FUNCNAME.cache.$(H "$GLOBAL_ALL_RELATIONS_HASH")" \
-          s rn ts rc td services
+    local cache_file="$state_tmpdir/$FUNCNAME.cache.$GLOBAL_ALL_RELATIONS_HASH" \
+          s rn ts rc td services service
     if [ -e "$cache_file" ]; then
         #debug "$FUNCNAME: SESSION cache hit $1"
         cat "$cache_file"
@@ -2418,7 +2418,7 @@ get_all_services() {
             services["$service"]=1
             echo "$service"
         done
-    done < <(cat "$GLOBAL_ALL_RELATIONS") > "$cache_file"
+    done < "$GLOBAL_ALL_RELATIONS" > "$cache_file"
 
     cat "$cache_file"
 }
@@ -4926,7 +4926,7 @@ esac
 
 get_all_relations "${services_args[@]}" >/dev/null || exit 1
 
-if [ "$is_docker_compose_action" -a "${#services_args[@]}" -gt 0 ]; then
+if [ -n "$is_docker_compose_action" ] && [ "${#services_args[@]}" -gt 0 ]; then
     services=($(get_master_services "${services_args[@]}")) || exit 1
     if [ "$action" == "up" ]; then
         declare -A seen