nixpkgs/pkgs/test/nixos-functions/default.nix
Will Fancher f8ed5f30c0 nixos/filesystems: Remove default = "auto" from fsType
NixOS has traditionally enabled the `ext` family of file systems by
default. Originally, when switching to systemd initrd, we wanted to
transition to making this explicit so that initrds could be made
without `ext`. The problem is that anyone with `fsType = "auto";` for
an `ext` file system in initrd will fail to boot, which is not really
an acceptable regression as we switch to systemd initrd by default.

By removing `default = "auto"` from `fsType`, we rule out the vast
majority of these regressions as eval errors, since most users of
`fsType = "auto"` for ext file systems are using it because of the
default value.

In hindsight, this is probably what #225352 was really about.
2026-04-05 19:06:28 -04:00

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Nix

/*
This file is a test that makes sure that the `pkgs.nixos` and
`pkgs.testers.nixosTest` functions work. It's far from a perfect test suite,
but better than not checking them at all on hydra.
To run this test:
nixpkgs$ nix-build -A tests.nixos-functions
*/
{
pkgs,
lib,
stdenv,
...
}:
let
dummyVersioning = {
revision = "test";
versionSuffix = "test";
label = "test";
};
in
lib.optionalAttrs (stdenv.hostPlatform.isLinux) (
lib.recurseIntoAttrs {
nixos-test =
(pkgs.nixos {
system.nixos = dummyVersioning;
boot.loader.grub.enable = false;
fileSystems."/" = {
device = "/dev/null";
fsType = "none";
};
system.stateVersion = lib.trivial.release;
}).toplevel;
}
)