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disko

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disko - declarative disk partitioning - https://github.com/nix-community/disko89 Servers

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30 Nov 2025
@not-jack:matrix.orgnot-jackso i think we're in the same situation14:11:48
@mou_bugtracker:matrix.orgmouAs i understand logic of the boot process, the important part is decide are you using UEFI. If yes, you have to have GPT partition table (not mbr) and old MBR requirement to have bootloader in first 512K of the drive is no longer reuirement. So this reservation for grub is not needed 14:15:35
@not-jack:matrix.orgnot-jackaha, so it's legacy for backwards compat with grum14:16:46
@not-jack:matrix.orgnot-jack* aha, so it's legacy for backwards compat with grub14:16:48
@mou_bugtracker:matrix.orgmouIt is not grub specific. It is applicable to any bootloader for MBR partitioned drive. All bootloader put their initialization code into first 512K right after partition table14:17:51
@not-jack:matrix.orgnot-jack * aha, so it's legacy for backwards compat with grub MBR 14:19:33
@mou_bugtracker:matrix.orgmouBut i did not refreshed my knowledge in this area for last decade, so i might mix things up. So, if you want to be sure, do additional check.14:19:34
@not-jack:matrix.orgnot-jackthe check will be seeing if i can boot!14:19:50
@mou_bugtracker:matrix.orgmouHere is more in depth explanation of the logic. https://superuser.com/questions/1566558/is-a-boot-sector-considered-to-be-a-partition14:22:28
@not-jack:matrix.orgnot-jackthanks, that helps :)14:26:46
@spewdins:beeper.comspewdins

For those using disko for vm’s disk sizes…

I wonder. Are you declaratively setting your vm .qcow2 for example, from the host system? Or from inside the vm.

17:03:16
@not-jack:matrix.orgnot-jackWhen using disko-install, i get no space left on device19:59:11
@not-jack:matrix.orgnot-jackI've tried remounting the store with more space, but that doesn't seem to do anything 20:00:00
@not-jack:matrix.orgnot-jackAnyone have tips? 20:00:07
@not-jack:matrix.orgnot-jackActually, looks like i'm oom'ing now20:06:19
@chickeniq:matrix.orgChickenIQ joined the room.21:39:45
@chickeniq:matrix.orgChickenIQI've been trying to generate a disk image for my pi 4 with disko, but i keep getting an error: "Firmware not found" Any idea on how i could fix it? Repo: https://github.com/ChickenIQ/NixOSPI421:45:53
@chickeniq:matrix.orgChickenIQ* I've been trying to generate a disk image for my pi 4 with disko, but i keep getting an error on boot: "Firmware not found" Any idea on how i could fix it? Repo: https://github.com/ChickenIQ/NixOSPI421:47:01
1 Dec 2025
@chickeniq:matrix.orgChickenIQ

this seems to be enough to get it to work

          esp = {
            size = "1024M";
            type = "EF00";
            content = {
              format = "vfat";
              type = "filesystem";
              mountpoint = "/boot";
              mountOptions = [ "umask=0077" ];
              postMountHook =
                let
                  configTxt = pkgs.writeText "config.txt" ''
                    [pi4]
                    kernel=u-boot-rpi4.bin
                    disable_overscan=1
                    enable_gic=1
                    arm_boost=1

                    [all]
                    avoid_warnings=1
                    enable_uart=1
                    arm_64bit=1
                  '';
                in
                toString (
                  pkgs.writeScript "postMountHook.sh" ''
                    (cd ${pkgs.raspberrypifw}/share/raspberrypi/boot && cp bootcode.bin fixup4.dat start4.elf bcm2711-*.dtb /mnt/boot/)
                    cp ${pkgs.ubootRaspberryPi4_64bit}/u-boot.bin /mnt/boot/u-boot-rpi4.bin
                    cp ${configTxt} /mnt/boot/config.txt
                  ''
                );
            };
          };
00:20:12
@chickeniq:matrix.orgChickenIQ

proper hack, works without disko too

{
  config,
  pkgs,
  lib,
  ...
}:

let
  installBootLoader =
    (import (pkgs.path + "/nixos/modules/system/boot/loader/generic-extlinux-compatible") {
      inherit config lib pkgs;
    }).config.content.system.build.installBootLoader;

  populateFirmware =
    (import (pkgs.path + "/nixos/modules/installer/sd-card/sd-image-aarch64.nix") {
      inherit config lib pkgs;
    }).sdImage.populateFirmwareCommands;

  installCmd = pkgs.writeShellScript "populate-boot.sh" ''
    set -e && export PATH=${pkgs.coreutils}/bin:$PATH
    ${installBootLoader} "$@"

    ln -s "/boot" "$NIX_BUILD_TOP/firmware" 
    cd "$NIX_BUILD_TOP" && ${populateFirmware} 
    echo "include usercfg.txt" >> /boot/config.txt
  '';
in
{
  system.build.installBootLoader = lib.mkForce installCmd;
}
03:27:03
@chickeniq:matrix.orgChickenIQ *

proper hack, works without disko too

{
  config,
  pkgs,
  lib,
  ...
}:

let
  installBootLoader =
    (import (pkgs.path + "/nixos/modules/system/boot/loader/generic-extlinux-compatible") {
      inherit config lib pkgs;
    }).config.content.system.build.installBootLoader;

  populateFirmware =
    (import (pkgs.path + "/nixos/modules/installer/sd-card/sd-image-aarch64.nix") {
      inherit config lib pkgs;
    }).sdImage.populateFirmwareCommands;

  installCmd = pkgs.writeShellScript "populate-boot.sh" ''
    set -e && export PATH=${pkgs.coreutils}/bin:$PATH
    ${installBootLoader} "$@"

    ln -s "/boot" "$NIX_BUILD_TOP/firmware" 
    cd "$NIX_BUILD_TOP" && ${populateFirmware} 
    echo "include usercfg.txt" >> /boot/config.txt
  '';
in
{
  system.build.installBootLoader = lib.mkForce installCmd;
}
03:27:14
@stooj:matrix.orgstooj joined the room.16:54:37
@stooj:matrix.orgstoojRedacted or Malformed Event17:32:21
@stooj:matrix.orgstooj

Possibly a general flake question: what is the syntax for applying a flake from a non-github repo and using a specific branch?

So far I'm trying:

nix run --extra-experimental-features 'nix-command flakes' 'github:nix-community/disko/latest#disko-install' -- --write-efi-boot-entries --flake 'https://codeberg.org/higara/legacy-nix-configuration.git?ref=add-klaes#klaes' --disk nvme0 /dev/nvme0n1

And getting:

error: Failed to open archive (Unrecognizde archive format)
.disko-install-wrapped: line 234: artifacts[1]: unbound variable
17:39:25
@stooj:matrix.orgstooj *

Possibly a general flake question: what is the syntax for applying a flake from a non-github repo and using a specific branch?

So far I'm trying:

nix run --extra-experimental-features 'nix-command flakes' \
    'github:nix-community/disko/latest#disko-install' -- \
    --write-efi-boot-entries \
    --flake 'https://codeberg.org/higara/legacy-nix-configuration.git?ref=add-klaes#klaes' \
    --disk nvme0 /dev/nvme0n1

And getting:

error: Failed to open archive (Unrecognizde archive format)
.disko-install-wrapped: line 234: artifacts[1]: unbound variable
17:40:32
@berrij:fairydust.spaceBerriJI guess you need 'git+https://...' instead of just starting directly with 'https://'17:44:09
@stooj:matrix.orgstoojThanks, I will try that.17:45:08
@brisingr05:matrix.orgBrisingr changed their display name from Brisingr05 to Brisingr.18:39:52
@stooj:matrix.orgstooj Thanks @berrij:fairydust.space 19:08:31
@berrij:fairydust.spaceBerriJQuick question: I want to streamline my deployment process for new machines a bit using disko, flakes and nixos-anywhere. Currently I only use disko without flakes and I crafted this disko config (https://codeberg.org/BerriJ/nixos-config/src/branch/main/hosts/common/disks/disko-luks-lvm-swap-btrfs.nix#L1-L9) which uses some variables for swap-size, etc. Ideally, I would add this config to my flake, and be able to define things like swapsize etc. per host (maybe inside the nixosConfigurations outputs of my flake?) Maybe someone of you has something like that, you would help me a lot 😇🙏20:49:57

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