centralize output folder computation

Author: diegomarquezp

library_generation/generate_library.sh

@@ -54,9 +54,9 @@ shift # past argument or value
 done
 
 script_dir=$(dirname "$(readlink -f "$0")")
-output_folder="$(pwd)/output"
-# source utility functions
 source "${script_dir}"/utilities.sh
+output_folder="$(get_output_folder)"
+# source utility functions
 
 if [ -z "${protobuf_version}" ]; then
   protobuf_version=$(get_protobuf_version "${gapic_generator_version}")

library_generation/test/generate_library_integration_test.sh

@@ -45,7 +45,7 @@ done
 script_dir=$(dirname "$(readlink -f "$0")")
 source "${script_dir}/../utilities.sh"
 library_generation_dir="${script_dir}"/..
-output_folder="$(pwd)/output"
+output_folder="$(get_output_folder)"
 mkdir -p "${output_folder}"
 pushd "${output_folder}"
 # checkout the master branch of googleapis/google (proto files) and WORKSPACE

library_generation/utilities.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
 set -xeo pipefail
+utilities_script_dir=$(echo "${BASH_SOURCE}" | rev | cut -d/ -f2- | rev)
+
 
 # define utility functions
 
@@ -275,3 +277,10 @@ get_version_from_versions_txt() {
   version=$(grep "$key:" "${versions}" | cut -d: -f3) # 3rd field is snapshot
   echo "${version}"
 }
+
+# gets the output folder where all sources and dependencies will be located. It
+# relies on utilities_script_dir which points to the same location as
+# `generate_library.sh`
+get_output_folder() {
+  echo "${utilities_script_dir}/output"
+}