Shell script to remove old versions of GAE services while deploying in Drone

remove_old_gae_versions.sh

#!/bin/bash
# keep only latest 2 versions of a GAE service based on the latest version numbers
VERSIONS=$(gcloud app versions list --service $1 --sort-by '~version' --format 'value(version.id)')
COUNT=0
echo "Keeping the $2 latest versions of the $1 service"
for VERSION in $VERSIONS
do
    ((COUNT++))
    if [ $COUNT -gt $2 ]
    then
      echo "Going to delete version $VERSION of the $1 service."
      # gcloud app versions delete $VERSION --service $1 -q
    else
      echo "Going to keep version $VERSION of the $1 service."
    fi
done

#!/bin/bash
#Deletes old versions of current services in GAE
# $1 = service_name
# $2 = future_instance_to_keep

VERSIONS=$(gcloud app versions list --service $1 --sort-by '~version' --format 'value(version.id)')
VERSION_TRAFFIC=$(gcloud app versions list --service $1 --sort-by '~version' --format 'value(version.id)' --hide-no-traffic)
DEPLOYED_VERSION=$2
echo "Keeping $DEPLOYED_VERSION and $VERSION_TRAFFIC of the $1 service"
for VERSION in $VERSIONS
do
    if [ $VERSION -ne $VERSION_TRAFFIC ] && [ $VERSION -ne $DEPLOYED_VERSION ]
    then
      echo "Going to delete version $VERSION of the $1 service."
      gcloud app versions delete $VERSION --service $1 -q
    fi
done