A shell script to selectively copy your GoogleService-Info.plist into your app bundle based on the current build configuration.

copy_appropriate_google-service-info-plist.sh

# Name of the resource we're selectively copying
GOOGLESERVICE_INFO_PLIST=GoogleService-Info.plist

# Get references to dev and prod versions of the GoogleService-Info.plist
# NOTE: These should only live on the file system and should NOT be part of the target (since we'll be adding them to the target manually)
GOOGLESERVICE_INFO_DEV=${PROJECT_DIR}/${TARGET_NAME}/Firebase/Dev/${GOOGLESERVICE_INFO_PLIST}
GOOGLESERVICE_INFO_PROD=${PROJECT_DIR}/${TARGET_NAME}/Firebase/Prod/${GOOGLESERVICE_INFO_PLIST}

# Make sure the dev version of GoogleService-Info.plist exists
echo "Looking for ${GOOGLESERVICE_INFO_PLIST} in ${GOOGLESERVICE_INFO_DEV}"
if [ ! -f $GOOGLESERVICE_INFO_DEV ]
then
    echo "No Development GoogleService-Info.plist found. Please ensure it's in the proper directory."
    exit 1
fi

# Make sure the prod version of GoogleService-Info.plist exists
echo "Looking for ${GOOGLESERVICE_INFO_PLIST} in ${GOOGLESERVICE_INFO_PROD}"
if [ ! -f $GOOGLESERVICE_INFO_PROD ]
then
    echo "No Production GoogleService-Info.plist found. Please ensure it's in the proper directory."
    exit 1
fi

# Get a reference to the destination location for the GoogleService-Info.plist
PLIST_DESTINATION=${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app
echo "Will copy ${GOOGLESERVICE_INFO_PLIST} to final destination: ${PLIST_DESTINATION}"

# Copy over the prod GoogleService-Info.plist for Release builds
if [ "${CONFIGURATION}" == "Release" ]
then
    echo "Using ${GOOGLESERVICE_INFO_PROD}"
    cp "${GOOGLESERVICE_INFO_PROD}" "${PLIST_DESTINATION}"
else
    echo "Using ${GOOGLESERVICE_INFO_DEV}"
    cp "${GOOGLESERVICE_INFO_DEV}" "${PLIST_DESTINATION}"
fi

This script and the article in Medium are great.
I had to change the script to handle mac app as well - the target location is different, so I added the following

if [ "${SWIFT_PLATFORM_TARGET_PREFIX}" == "macos" ]
then
    PLIST_DESTINATION=${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}/Resources
else
    PLIST_DESTINATION=${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app
fi

Hi I am having an issue when i integrated this script and used the approach you suggested into my existing project . The issue is as follows
error: Could not get GOOGLE_APP_ID in Google Services file from build environment

When targeting watchos use:
PLIST_DESTINATION=${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.appex

Hi @tylermilner . This is save my day. Can you explain why set PLIST_DESTINATION=${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app and not the other? Where is ${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app location in my project?

Hi I am having an issue when i integrated this script and used the approach you suggested into my existing project . The issue is as follows error: Could not get GOOGLE_APP_ID in Google Services file from build environment

Faced same problem. You must change the order of run script and try again. It will be fixed.

is there any solution for Could not get GOOGLE_APP_ID in Google Services file from build environment?