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

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

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;

  installCommand = pkgs.writeShellScript "populate-boot.sh" ''
    set -e && export PATH=${pkgs.coreutils}/bin:$PATH
    ${builtins.replaceStrings [ "firmware/" ] [ "boot/" ] populateFirmware}
    echo "include usercfg.txt" >> boot/config.txt
    ${installBootLoader} "$@"
  '';
in
{
  system.build.installBootLoader = lib.mkForce installCommand;
}

How do you guys handle diffrent /dev/* paths,

i use nixos anywhere to add nodes to my cluster but some nodes will have /dev/nvme0n1 as root and some /dev/sda1 and so on

Is there way to automatically select which ever is avaialable ?

Couple of questions about NixOS live USBs:

I want to partition my 64 GB USB flash drive into two partitions (FAT32 live USB + ext4 storage), so I used the following disko config:

let
  usb = "/dev/disk/by-id/usb-USB_SanDisk_3.2Gen1_0401a943ae4197a38a6f9070194e9ea2b3fb8dbb7997e05ed1b197c0e28946be4b8f000000000000000000001cf4be6800926418a955810751ab6336-0:0";
in {
  disko.devices = {
    disk = {
      live = {
        type = "disk";
        device = usb;
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              type = "EF00";
              device = "${usb}-part1";
              priority = 0;
              size = "8192M";
              content = {
                type = "filesystem";
                format = "vfat";
              };
            };
            storage = {
              device = "${usb}-part2";
              priority = 1;
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
              };
            };
          };
        };
      };
    };
  };
}

I then copied over the files from the (minimal, non-graphical) NixOS live ISO into partition 1, hoping that the instructions on the Arch wiki would generalize to NixOS, but then my live ISO gets stuck with the following error message:

[...]
Timed out waiting for device /dev/root, trying to mount anyway
mounting /dev/root on /iso...
mount: mounting /dev/root on /mnt-root/iso failed: No such file or directory

An error occurred [...]

How can I use my USB flash drive as both a live USB and as a storage device? I found this relevant Discourse link but there was no resolution to the problem there.

I realize this might not be the best place to ask this, but I figured that folks here would have expertise configuring boot partitions correctly.

Couple of questions about NixOS live USBs:

I want to partition my 64 GB USB flash drive into two partitions (FAT32 live USB + ext4 storage), so I used the following disko config:

let
  usb = "/dev/disk/by-id/usb-USB_SanDisk_3.2Gen1_0401a943ae4197a38a6f9070194e9ea2b3fb8dbb7997e05ed1b197c0e28946be4b8f000000000000000000001cf4be6800926418a955810751ab6336-0:0";
in {
  disko.devices = {
    disk = {
      live = {
        type = "disk";
        device = usb;
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              type = "EF00";
              device = "${usb}-part1";
              priority = 0;
              size = "8192M";
              content = {
                type = "filesystem";
                format = "vfat";
              };
            };
            storage = {
              device = "${usb}-part2";
              priority = 1;
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
              };
            };
          };
        };
      };
    };
  };
}

I then copied over the files from the (minimal, non-graphical) NixOS live ISO into partition 1, hoping that the instructions on the Arch wiki would generalize to NixOS, but then my live ISO gets stuck with the following error message:

[...]
Timed out waiting for device /dev/root, trying to mount anyway
mounting /dev/root on /iso...
mount: mounting /dev/root on /mnt-root/iso failed: No such file or directory

An error occurred [...]

How can I use my USB flash drive as both a live USB and as a storage device? I found this relevant Discourse link but there was no resolution to the problem there.

I realize this might not be the best place to ask this, but I figured that folks here would have expertise configuring boot partitions correctly.

For reference, the NixOS manual says I should dd the ISO to the disk directly: sudo dd if=<path-to-image> of=/dev/sdX bs=4M conv=fsync

In reply to @tim92:matrix.org
I don't think that this will work since you need to unmount the live USB to format it as storage device

Soooo,
I have decided to just try it.
After debugging some syntax issues, I have encountered this bug:

error:
       … while evaluating the attribute 'diskoScript'

         at /nix/store/3mlzsgflq3z4wsk2arffhd999h1hj17g-disko/share/disko/lib/default.nix:418:15:

          417|
          418|               diskoScript = (diskoLib.writeCheckedBash { inherit pkgs checked; }) "disko" ''
             |               ^
          419|                 export PATH=${lib.makeBinPath ((cfg.config._packages pkgs) ++ [ pkgs.bash ])}:$PATH

       … in the condition of the assert statement

         at /nix/store/y11h0vfmjaf8j1796x0n2454hqldnbbr-0vyi8f8l8cya10dmgfrj0df2iqxlhiyi-source/pkgs/build-support/writers/scripts.nix:32:5:

           31|     assert (types.path.check nameOrPath) || (builtins.match "([0-9A-Za-z._])[0-9A-Za-z._-]*" nameOrPath != null);
           32|     assert (types.path.check content) || (types.str.check content);
             |     ^
           33|     let

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: The option `disko.devices.disk.lvm_vg.root_vg' does not exist. Definition values:
       - In `<unknown-file>':
           {
             lvs = {
               games = {
                 content = {
                   extraArgs = [
           ...

Does anybody have any idea how I can fix this?

Here's my disko.nix:

{
disko.devices = {
	disk = {
		disk0 = {
			type = "disk";
			device = "/dev/nvme1n1";
			content = {
				type = "gpt";
				partitions = {
					esp = {
						name = "ESP";
						size = "500M";
						type = "EF00";
						content = {
							type = "filesystem";
							format = "vfat";
							mountpoint = "/boot";
						};
					};

					root = {
						name = "root0";
						size = "100%";
						content = {
							type = "lvm_pv";
							vg = "root_vg";
						};
					};
				};
			};
		};
		disk1 = {
			type = "disk";
			device = "/dev/nvme0n1";
			content = {
				type = "gpt";
				partitions = {
					root = {
						name = "root1";
						size = "100%";
						content = {
							type = "lvm_pv";
							vg = "root_vg";
						};
					};
				};
			};
		};

		lvm_vg = {
			root_vg = {
				type = "lvm_vg";
				lvs = {
					root = {
						size = "25%FREE";
						content = {
							type = "btrfs";
							extraArgs = ["-f"];
							subvolumes = {
								"/root" = {
							 	 mountpoint = "/";
								};

								"/persist" = {
								mountOptions = ["subvol=persist" "noatime"];
								mountpoint = "/persist";
								};

								"/nix" = {
								mountOptions = ["subvol=nix" "noatime"];
								mountpoint = "/nix";
								};
							};
						};
					};

					games = {
						size = "100%FREE";
						content = {
							type = "btrfs";
							extraArgs = ["-f"];
							subvolumes = {
								"/games" = {
								mountOptions = ["subvol=games" "noatime"];
								mountpoint = "/games";
								};
							};
						};
					};
				};
			};
		};
	};
};
}