Oracle Linux 8.5 to NixOS with ESP resizing

cloudinit.yaml

#cloud-config
# vim: syntax=yaml

disable_root: false
ssh_authorized_keys: []
write_files:
  - path: "/etc/ssh/sshd_config.d/permit_root"
    owner: "root:root"
    permissions: "0644"
    content: |
      PermitRootLogin without-password
  - path: "/etc/iptables/rules.v4"
  - path: "/etc/iptables/rules.v6"

  - path: /etc/nixos/host.nix
    permissions: "0644"
    content: |
      {pkgs, lib, config, ...}:
      {
        environment.systemPackages = with pkgs; [ vim git ];
        networking.usePredictableInterfaceNames = true;

        nix = {
           package = pkgs.nixFlakes;
           extraOptions = lib.optionalString (config.nix.package == pkgs.nixFlakes)
             "experimental-features = nix-command flakes";
        };
      }

users:
  - name: ubuntu
    inactive: true

package_update: true
package_upgrade: false
package_reboot_if_required: false

locale: "en_US.UTF-8"
timezone: "Europe/London"

runcmd:
  - /usr/libexec/oci-growfs -y
  - pkill OSWatcher
  - umount /var/oled
  - lvremove /dev/mapper/ocivolume-oled
  - lvresize -l +100%FREE /dev/mapper/ocivolume-root
  - >
    echo "drive d: file=\"/dev/sda1\" exclusive" > /etc/mtools.conf
  - echo "mtools_skip_check=1" >> /etc/mtools.conf
  - cp -a /boot /root/

  # Try to ensure we can unmount and remount /boot
  - sed -i '/boot/d' /etc/fstab
  - sed -i '/oled/d' /etc/fstab
  - systemctl disable boot.mount

  - umount /boot/efi
  - umount /boot

  - sgdisk -d 1 -d 2 -n 1:0:0 -t 1:ef00 -c 1:"EFI System Partition" /dev/sda
  - partprobe /dev/sda
  - mkfs.fat -F32 /dev/sda1

  - mount -v /dev/sda1 /boot
  - cp -a /root/boot /

  - >
    curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect |
    NO_SWAP=1
    NIXOS_IMPORT=./host.nix
    NIX_CHANNEL=nixos-21.11
    bash -x |
    tee /tmp/infect.log

What is the purpose of the mtools configuration file in this?

@vamega I don’t think there is, it might be there because I thought I needed some dos flags on the ESP partition.

I have not verified that it’s not needed, but 97% sure. Will update it when I have time to verify

Thanks, I removed that section and didn't seem to have any issues.
Let me know if you find anything different.