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#!/usr/bin/env bash
set -Eeuo pipefail
usage() {
red "Missing argument $1."
cat <<EOF
Usage:
burn-nixos.sh <NIXOS_URL> <USB_STICK>
Arguments:
NIXOS_URL Download URL for NixOS ISO to be installed. Can be found at https://nixos.org/nixos/download.html
USB_STICK File descriptor of USB stick where to burn the ISO into. Use lsblk or similar tools to get it's name.
Examples:
Download NixOS 19.03 x86_64 and burn it into stick on /dev/sdb:
NIXOS_URL='https://releases.nixos.org/nixos/19.03/nixos-19.03.172764.50d5d73e22b/nixos-minimal-19.03.172764.50d5d73e22b-x86_64-linux.iso'
burn-nixos.sh "\$NIXOS_URL" /dev/sdb
EOF
}
NIXOS_URL="${1:-}"
USB_STICK="${2:-}"
ISO_PATH='/tmp/nixos.iso'
[[ -z "${NIXOS_URL}" ]] && {
usage 'NIXOS_URL'
exit 2
}
[[ -z "${USB_STICK}" ]] && {
usage 'USB_STICK'
exit 2
}
yellow "Downloading NixOS ISO..."
wget -cO "${ISO_PATH}" "${NIXOS_URL}"
wget -cO "${ISO_PATH}.sha256" "${NIXOS_URL}.sha256"
diff <(sha256sum "${ISO_PATH}" | awk '{print $1}') <(awk '{print $1}' < "${ISO_PATH}.sha256") || {
red "SHA256 didn't match!"
exit 1
}
green "Done. SHA256 match."
yellow "Writing ISO image to ${USB_STICK}. We'll need sudo for it..."
umount "${USB_STICK}1" ||:
blue "$(du -hs /tmp/nixos.iso)"
sudo dd if="${ISO_PATH}" of="${USB_STICK}" status=progress
green "Done. You can remove the USB stick ${USB_STICK} with no unmounting required."
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