docker compose up wrapper to automatically restart containers for which read-only volumes have been changed on the host machine

dcu.sh

#!/bin/sh

print_usage() {
  SCRIPT_NAME=$(basename "$0")
  echo "Simple wrapper of docker compose to add labels to force the container re-creation when config files are updated"
  echo "Example: $SCRIPT_NAME -f compose.custom.yaml up -d"
  exit "$1"
}

FILES_ARG=
OTHER_ARGS=
while [ "$#" -gt 0 ]; do
  case $1 in
  -h | --help) print_usage 0 ;;
  -f | --file)
    FILES=$(printf "%s\n%s" "${FILES}" "$2")
    FILES_ARG="$FILES_ARG --file $2"
    shift
    ;;
  *)
    OTHER_ARGS="$OTHER_ARGS $1"
    ;;
  esac
  shift
done
FILES=$(printf "%s" "$FILES" | tail -n +2) # delete first new line

if [ -z "$FILES" ]; then
  # use default files
  files=(
    ./compose.yaml
    ./compose.yml
    ./docker-compose.yaml
    ./docker-compose.yml
  )
  for file in "${files[@]}"; do
    if [ ! -f "$file" ]; then
      continue
    fi
    FILES=$(printf "%s%s\n" "${FILES}" "$file")
    FILES_ARG="--file $file"
    break
  done
fi

INITIAL_DIR=$(pwd)

OVERRIDE_COMPOSE_FILE="compose.local.yaml"
touch $OVERRIDE_COMPOSE_FILE
truncate -s 0 $OVERRIDE_COMPOSE_FILE

while IFS= read -r file; do
  if [ ! -f "$file" ]; then
    1>&2 echo "File $file does not exist"
    exit 1
  fi

  SERVICES=$(yq -r '.services | keys | ... comments="" | .[]' $file) # list services
  BASE_PATH=$( dirname $file)
  cd "$BASE_PATH"

  while IFS= read -r service; do
    VOLUMES=$(yq -r '.services.'"$service"'.volumes[]' $file)
    lastModificationSeconds=0
    while IFS= read -r volume; do
      case $volume in ./*:ro)
        volume=$(echo $volume | sed "s|:.*||")
        volumeModificationSeconds=$(date -r $volume +%s)
        lastModificationSeconds=$(( volumeModificationSeconds > lastModificationSeconds ? volumeModificationSeconds : lastModificationSeconds ))
      esac
    done <<< "$VOLUMES"
    yq -i '.services.'"$service"'.labels."com.pasdam.volumes-last-modified-timestamp" |= '$lastModificationSeconds'' $OVERRIDE_COMPOSE_FILE
  done <<< "$SERVICES"
done <<< "$FILES"

FILES_ARG="$FILES_ARG --file $OVERRIDE_COMPOSE_FILE"

cd "$INITIAL_DIR"
docker compose $FILES_ARG $OTHER_ARGS