recreate docker pods if local diverges from remote

recreate-pods.sh

#!/usr/bin/env bash

# abort the script if a command returns with a non-zero exit code
set -o errexit
# abort script when accessing an unset variable
set -o nounset
# pipeline command is treated as failed, even if one command in the pipeline fails
set -o pipefail

if [[ "${TRACE-0}" == "1" ]]; then set -o xtrace; fi

# get flags
while getopts u:b: flag
do
    case "${flag}" in
        u) REPO_URL=${OPTARG};;
        b) BRANCH=${OPTARG};;
        *) echo "usage: $0 [-u <repo url>] [-b <branch name>]" >&2
          exit 1 ;;
    esac
done

# hash of last commit of remote origin
REMOTE_HASH=$(git ls-remote "$REPO_URL" --heads "refs/heads/$BRANCH" | awk '{print $1}')

# hash of last commit of local
LOCAL_HASH=$(git rev-parse HEAD)

echo "REMOTE_HASH=${REMOTE_HASH-}"
echo "LOCAL_HASH=${LOCAL_HASH-}"

if [[ "$REMOTE_HASH" == "$LOCAL_HASH" ]]
then
  echo "no changes"
  exit 0
fi

# if so recreate new pods
echo "building and redeploying pods"
git pull
docker-compose up --force-recreate --build -d