Convert portable Mac OS wine tarballs to wineskin engines

convert_to_engine.sh

#!/bin/bash

command -v 7z >/dev/null 2>&1 || ( echo "Error: '7z' binary is missing." >&2; exit 1 )

set -ex

VERSION=3.18
PACKAGE="https://dl.winehq.org/wine-builds/macosx/pool/portable-winehq-staging-${VERSION}-osx.tar.gz"
ENGINE_DIR="${HOME}/Library/Application Support/Wineskin/Engines"
ENGINE_FILE="${ENGINE_DIR}/WS9Wine${VERSION}.tar.7z"

if [ -e "${ENGINE_FILE}" ]; then
  echo "Error: File '$ENGINE_FILE' already exists.  Aborting" >&2
  exit 1
fi

TMPDIR=$(mktemp -d)
(
  cd ${TMPDIR}
  curl -SL "${PACKAGE}" | tar -zxf -
  mv usr wswine.bundle
  echo "wine${VERSION}" > wswine.bundle/VERSION
  mkdir -p "${ENGINE_DIR}"
  tar cf - wswine.bundle | 7z a -si "${ENGINE_FILE}"
)