Creates a macOS .dmg from a .app

macos-create-dmg-from-app.bash

#!/bin/bash

# Create a .dmg from the provided .app. Accepts a single argument
# which should be something like
#
#   ~/mybuilds/Firefox.app
#
# Uses a 1024m disk image file. Increase as necessary.

set -x
APP_PATH=$1

DISK_IMAGE_DIR=`mktemp -d`
TEMP_FILE=`mktemp`
TEMP_DMG=${TEMP_FILE}.dmg
NAME=`basename "${APP_PATH}" .app`

ditto "${APP_PATH}" "${DISK_IMAGE_DIR}/${NAME}.app"
hdiutil create -size 1024m -fs HFS+ -volname Firefox -srcfolder "${DISK_IMAGE_DIR}" "${TEMP_DMG}"
hdiutil convert -format UDZO -o "${NAME}.dmg" "${TEMP_DMG}"

rm ${TEMP_FILE}
rm ${TEMP_DMG}
rm -rf "${DISK_IMAGE_DIR}"