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nixos/filesystems: Remove default = "auto" from fsType

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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.
This commit is contained in:
Will Fancher 2025-09-10 02:00:08 -04:00
commit f8ed5f30c0
18 changed files with 48 additions and 10 deletions
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5
nixos/tests/image-contents.nix
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@ -19,7 +19,10 @@ let
../modules/testing/test-instrumentation.nix
../modules/profiles/qemu-guest.nix
{
fileSystems."/".device = "/dev/disk/by-label/nixos";
fileSystems."/" = {
device = "/dev/disk/by-label/nixos";
fsType = "ext4";
};
boot.loader.grub.device = "/dev/vda";
boot.loader.timeout = 0;
nixpkgs.pkgs = pkgs;