use buildin func

Author: JoeWang1127

.cloudbuild/library_generation/library_generation.Dockerfile

@@ -62,7 +62,7 @@ ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"
 
 # install OS tools
-RUN apk update && apk add unzip curl rsync openjdk11 jq bash nodejs npm git uuidgen
+RUN apk update && apk add unzip curl rsync openjdk11 jq bash nodejs npm git
 
 SHELL [ "/bin/bash", "-c" ]
 

hermetic_build/library_generation/generate_library.sh

@@ -114,8 +114,8 @@ fi
 if [ -z "${os_architecture}" ]; then
   os_architecture=$(detect_os_architecture)
 fi
-
-temp_destination_path="${output_folder}/temp_preprocessed/$(uuidgen)"
+random_suffix=$(LC_ALL=C tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 10 | head -n 1)
+temp_destination_path="${output_folder}/temp_preprocessed/${random_suffix}"
 mkdir -p "${output_folder}/${destination_path}"
 if [ -d "${temp_destination_path}" ]; then
   # we don't want the preprocessed sources of a previous run