backup all of your Mac App Store apps

backupmas.sh

#!/usr/bin/env zsh -f
# Purpose: Create a backup of all Mac App Store apps
# NTS: like 'backup-mas-apps.sh' but without growlnotify
# From:	Timothy J. Luoma
# Mail:	luomat at gmail dot com
# Date:	2019-06-01


	# point this to wherever you want backups to be made.
	# it will be created if it does not exist
	# each app will be given its own sub-folder in this folder
BACKUP_DIR="$HOME/Local/Backups/MacAppStore"

##################################################################
##                                                              ##
## You should not have to change anything below this line       ##
##                                                              ##
##################################################################

NAME="$0:t:r"

if [[ -e "$HOME/.path" ]]
then
	source "$HOME/.path"
else
	PATH="/usr/local/scripts:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin"
fi

if (( $+commands[mas] ))
then
		# try to update Mac App Store apps before running this command
		# although it cannot always tell which apps need to be updated.
	mas upgrade
fi


if [[ ! -e "$BACKUP_DIR" ]]
then

	mkdir -p "$BACKUP_DIR"

fi

if [[ ! -e "$BACKUP_DIR" ]]
then

	echo "$NAME: failed to create '$BACKUP_DIR'." >>/dev/stderr
	exit 2

fi

if (( $+commands[xz] ))
then
		# if 'xz' exists, use it with tar
	function my_archive  {
		tar -c --verbose --options='xz:compression-level=9' --xz -c --file "$BACKUP_FILENAME" "$line"
	}

	EXT='xz'

else
		# if 'xz' does not exist, use bzip2

	function my_archive  {
		tar -c --verbose --bzip2 --file "$BACKUP_FILENAME" "$line"
	}

	EXT='bz2'
fi

cd '/Applications'

find * -iname '_MASReceipt' -maxdepth 2 -print \
| sort --ignore-case \
| sed 's#/Contents/_MASReceipt$##g' \
| while read line
do

		# don't try to backup Xcode, it's too big
		# remove this if you want to back it up anyway
	[[ "$line" == "Xcode.app" ]] && continue

		# this is the name of the app with any spaces removed
	SHORT="${${line:t:r}// /}"

		# this is the major version number
	VERSION=$(defaults read "$PWD/$line/Contents/Info" CFBundleShortVersionString 2>/dev/null || echo 'x')

		# this is the build number
	BUILD=$(defaults read "$PWD/$line/Contents/Info" CFBundleVersion 2>/dev/null || echo 'x')

		# this is the filename that will be used
	BACKUP_FILENAME="$SHORT.$VERSION.$BUILD.tar.$EXT"

		# this is the full path to the backed-up file
	BACKUP_FULL="$BACKUP_DIR/$SHORT/$BACKUP_FILENAME"

	if [[ -e "$BACKUP_FULL" ]]
	then

		echo "	$NAME: $line: this version is already backed up at '$BACKUP_FULL'."

	else

		echo "$NAME: $line: Creating new backup at '$BACKUP_FULL'"

			# this will create the directory if needed
		mkdir -p "$BACKUP_FULL:h"

		my_archive

		EXIT="$?"

		if [ "$EXIT" = "0" ]
		then

			echo "$NAME: Successfully made '$BACKUP_FILENAME'."

			mv -vf "$BACKUP_FILENAME" "$BACKUP_FULL"

		else

			echo "$NAME: failed to create '$BACKUP_FILENAME' (\$EXIT = $EXIT)"

			if [[ -e "$BACKUP_FILENAME" ]]
			then
					# if the process exited with an error but left a file, move the file to the trash
				mv -vf "$BACKUP_FILENAME" "$HOME/.Trash/"

			fi

		fi

	fi

done

exit 0
#EOF