install

#!/bin/sh
# POSIX

dest_path="/usr/local/bin"
verbose=0

# Print usage to stdout.
# Arguments:
#   None
# Outputs:
#   print usage with examples.
show_help() {
	echo "USAGE:
    install -p /usr/local/bin

	Arguments:
		--path/-p:		path where to deploy the files (default /usr/local/bin)
		--help/-h:		show this message
		-v:			show more verbosity
	"
}

# Parse arguments
while :; do
	case $1 in
	-h | --help)
		# Call a "show_help" function to display a synopsis, then exit.
		show_help
		exit
		;;
	-v | --verbose)
		shift
		verbose=1
		;;
	-p | --path)
		if [ -n "$2" ]; then
			dest_path="$2"
			shift
			shift
		fi
		;;
	*) # Default case: If no more options then break out of the loop.
		break ;;
	esac
done

set -o errexit
set -o nounset
# set verbosity
if [ "${verbose}" -ne 0 ]; then
	set -o xtrace
fi

# Ensure the foundamental variables are set and not empty, we will not proceed if
# they are not all set.
[ ! -d "${dest_path}" ] && echo "Path ${dest_path} does not exist." && exit 1
[ ! -w "${dest_path}" ] && echo "Cannot write into ${dest_path}, permission denied." && exit 1

# get current dir
curr_dir=$(dirname "$0")
cd "${curr_dir}" || exit 1

# if files are available, install files in dest folder
# else download targz and uncompress it
if [ -f "${curr_dir}/distrobox-enter" ]; then
	for file in distrobox-*; do
		cp "${file}" "${dest_path}"
		chmod 0755 "${dest_path}/${file}"
	done
else

	# check that we have base dependencies
	if ! command -v curl || ! command -v tar; then
		echo "Online install depends on curl and tar"
		exit 1
	fi

	release_ver=$(curl -L https://github.com/89luca89/distrobox/releases/latest | grep 'refs/tags' | tail -1 | cut -d'"' -f2)
	release_name=$(echo "${release_ver}" | rev | cut -d'/' -f1 | rev)

	# go in tmp
	cd /tmp
	# download our target
	curl -L "https://github.com/${release_ver}" -o "${release_name}"
	# uncompress
	tar xvf "${release_name}"
	# deploy our files
	for file in "distrobox-$(echo "${release_name}" | sed 's/.tar.gz//g')"/distrobox-*; do
		cp "${file}" "${dest_path}"
		chmod 0755 "${dest_path}/$(basename ${file})"
	done

	# securely delete unneeded files
	rm -f "${release_name}"
	rm -f "distrobox-$(echo "${release_name}" | sed 's/.tar.gz//g')"/*
	rmdir "distrobox-$(echo "${release_name}" | sed 's/.tar.gz//g')"
fi