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disko

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disko - declarative disk partitioning - https://github.com/nix-community/disko87 Servers

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28 Nov 2025
@mou_bugtracker:matrix.orgmou joined the room.18:22:34
29 Nov 2025
@not-jack:matrix.orgnot-jack joined the room.18:37:29
30 Nov 2025
@not-jack:matrix.orgnot-jack

whats the advantage to having both boot and an ESP partitions?

          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            ESP = {
              size = "1G";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "umask=0077" ];
              };
            };
13:39:39
@not-jack:matrix.orgnot-jack *

whats the advantage to having both boot and an ESP partitions?

          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            ESP = {
              size = "1G";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "umask=0077" ];
              };
            };
13:39:49
@not-jack:matrix.orgnot-jack what does the boot partition do here? 13:44:42
@hexa:lossy.networkhexathat's called hybrid14:04:27
@hexa:lossy.networkhexaif you don't care or the thing needs to be portable14:04:36
@not-jack:matrix.orgnot-jackso i can get rid of it?14:05:47
@mou_bugtracker:matrix.orgmou

I'm using systemd-boot (no grub) with UEFI, and for this it is enought to have single /boot with ESP like this

          type = "gpt";
          partitions = {
            ESP = {
              type = "EF00";
              size = "2G";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
              };
            };
14:08:25
@mou_bugtracker:matrix.orgmoubut your config mentioned MBR in comments, so it might be different situation for you14:09:13
@not-jack:matrix.orgnot-jackthis is the default config for single disk ext414:10:19
@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

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