Docker entrypoint para migrations no rails (e mais)

entrypoint.sh

#!/bin/sh

set -e

[ -z "$(env | grep RUN_RAILS_CMDS)" ] && RUN_RAILS_CMDS=1

rails_cmd () {
  if [ -z "$RUN_RAILS_CMDS" ]; then
    echo "Rails commands are deactivated because RUN_RAILS_CMDS is empty." >&2
    return 0
  else
    eval "$@"
    CMD_CODE=$?

    [ "$CMD_CODE" == "0" ] && echo "$CMD_OUTPUT"
    return $CMD_CODE
  fi
}

HASH_FILE="tmp/assets-digest.txt"
LATEST_HASH=""

cd $APP_DIR

echo '-- Checking if there is any migration pending...'

PENDING_MIGRATIONS_OUTPUT=$(rails_cmd "bundle exec rake db:migrate:status | grep -E '\\d{14}' | awk '{print \$1}' | grep down | wc -l")

if [ "$PENDING_MIGRATIONS_OUTPUT" == "0" ]; then
  echo -e '- Great! There is no pending migration to be executed.\n'
else
  echo '- Yup! There is. Running pending migrations...'
  echo '---------------------------------------------------'

  rails_cmd rails db:migrate

  echo '---------------------------------------------------'
  echo -e '- Migrations finished.\n'
fi


echo '-- Checking if assets have changed since last compilation...'

CURRENT_HASH=$(
  find app/webpack -type f -exec sha256sum {} \; \
    | awk '{print $1}' \
    | sha256sum \
    | awk '{print $1}'
)

if [ -f "$HASH_FILE" ]; then
  LATEST_HASH=$(cat $HASH_FILE)

  if [ "$CURRENT_HASH" != "$LATEST_HASH" ]; then
    echo '- Ooops! They have. Recompiling...'
    echo '---------------------------------------------------'

    rails_cmd rails webpacker:compile

    echo "$CURRENT_HASH" > $HASH_FILE
    echo '---------------------------------------------------'
    echo -e '- Compiled! Assets digest registry file updated.\n'
  else
    echo '- Cool! They have not. Skipping compilation.'
  fi
else
  echo "- The assets weren't compiled ever before. Compiling..."
  echo '---------------------------------------------------'

  rails_cmd rails webpacker:compile

  echo "$CURRENT_HASH" > $HASH_FILE
  echo '---------------------------------------------------'
  echo -e 'Compiled! Assets digest registry file created.\n'
fi

exec "$@"