tar-strap

#!/bin/bash

usage() {
	bin=$(basename $0)
	echo >&2 "Usage: $bin tar-url [path]"
	echo >&2
	echo >&2 "Creates arch chroot using tarball url"
	echo >&2  " in specified path (default: arch-root, must not exist)."
	echo >&2 "Get the tarball url from: https://mirrors.kernel.org/archlinux/iso/latest/"
	exit ${1:-0}
}
[[ -z "$1" || "$1" = -h || "$1" = --help ]] && usage
[[ "$#" -gt 2 ]] && usage 1

set -e -o pipefail
export LC_ALL=C

url=$1 p=${2:-arch-root}

[[ -f "$url" ]] && url=$(readlink -f "$url")

[[ -e "$p" ]] || mkdir -m0700 "$p"
pushd "$p" >/dev/null

if [[ -f "$url" ]]
then
	ln -s "$url".sig src.tar.xx.sig
	ln -s "$url" src.tar.xx
else
	echo $url
	curl "$url".sig >src.tar.xx.sig
	curl "$url" >src.tar.xx
fi

pacman-key -v src.tar.xx.sig

rm -f src.tar.xx.sig
bsdtar -xf src.tar.xx
rm -f src.tar.xx

mv root.*/* .
rmdir root.*

cp -aL /etc/{locale.gen,localtime,hostname,resolv.conf} etc/
cp -aL /etc/pacman.d/{mirrorlist,gnupg} etc/pacman.d/

popd >/dev/null

exec arch-chroot "$p" /bin/bash