updater for etcher.io

update_etcher.sh

#!/bin/bash

# get current dir
prog_dir="/opt/$(ls /opt/ | grep etcher | grep -v zip)"
echo "DIR: $prog_dir"
prog_dir_version=$(echo $prog_dir | awk -F/ '{ print $3 }' | awk -F- '{ print $2 }')
if [ "$prog_dir_version" == "electron" ]
then
	prog_dir_version=$(echo $prog_dir | awk -F/ '{ print $3 }' | awk -F- '{ print $3 }')
fi
echo "DIR Version: $prog_dir_version"

# get current url
prog_url=$(curl -s https://github.com/resin-io/etcher/releases | grep linux | grep 64 | grep zip | grep '\<a' | head -n1 | sed s/'.*href="'/'https:\/\/github.com'/ | sed s/'".*'/''/)
echo "URL: $prog_url"
prog_url_version=$(echo $prog_url | awk -F/ '{print $(NF-1)}' | sed s/'v'/''/)
echo "URL Version: $prog_url_version"

# check that a current version is found
if [ "$prog_dir_version" == "" ]
then
	echo "New Installation! (no old version found)"
	new_install="1"
fi

# check that a new version and url are found
if [ "$prog_url" == "" ] || [ "$prog_url_version" == "" ]
then
	echo "couldn't find url for new version"
	exit
fi

# check current dir version with current url version
if [ "$prog_dir_version" != "$prog_url_version" ]
then
	if [ "$new_install" != "1" ]
	then
		echo "New Version Found!"
	fi

	cd /opt/
	# download
	wget --quiet --show-progress -O etcher.zip $prog_url

	# unpack zip
	unzip etcher.zip

	# remove download
	rm etcher.zip

	# remove old version
	if [ "$new_install" != "1" ]
	then
		if [ -f ./etcher-$prog_dir_version-x86_64.AppImage ]
		then
			rm ./etcher-$prog_dir_version-x86_64.AppImage
		fi
		if [ -f ./etcher-electron-$prog_dir_version-x86_64.AppImage ]
		then
			rm ./etcher-electron-$prog_dir_version-x86_64.AppImage
		fi
	fi

	# run etcher
	if [ "$new_install" == "1" ]
	then
		./etcher-electron-$prog_url_version-x86_64.AppImage &
	fi
fi