NixOS Rescue Script for Live Disk

readme.md

NixOS Rescue Script for Live Disk

This is my personal recovery script for nixos that I use when the boot fails. It allows you to edit the nixos config and reinstalls the boot loader. Note that I don't use flakes in my setup.

I created a live USB drive by downloading a graphical ISO from https://nixos.org/download/#nixos-iso (installed with https://rufus.ie/ to the usb drive on a windows laptop), then booting from the USB drive (without reinstalling nixos), connecting to the internet and then running the script above.

The only reason this script is public is so that I don't have to log in to github after booting from the live usb drive.

Use at your own risk. You probably will need to adapt the /dev paths in the mount commands.

LICENSE

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to http://unlicense.org/

nixos-rescue.bash

#!/usr/bin/env bash
if [ "$EUID" -ne 0 ]
  then echo -e 'Forgot "sudo"??\n';
  exit
fi

echo -e 'Unencrypt disks with gparted\n';
read -n 1 -s -r -p "Press any key to continue";
echo -e '\n';

mount --onlyonce --mkdir /dev/mapper/vg-nixos /mnt;
mount --onlyonce --mkdir /dev/disk/by-uuid/6932-651B /mnt/boot;

echo -e '\nEdit nixos config now @ /mnt/etc/nixos/configuration.nix\n';
read -n 1 -s -r -p "Press any key to continue";
echo -e '\n';

[ ! -d '/tmp/boot' ] && mv /mnt/boot /tmp/boot || rm -rf /mnt/boot;
NIXOS_INSTALL_BOOTLOADER=1 nixos-enter -c 'SUDO_USER="" NIXOS_SWITCH_USE_DIRTY_ENV=1 nixos-rebuild boot --install-bootloader --option sandbox false';


echo -e '\nMake sure /mnt/boot is not empty before rebooting!!!\n';
ls -la /mnt/boot;
echo -e '\n';
read -n 1 -s -r -p "Press any key to continue";
echo -e '\n';