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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
pkgs/test/nixos-functions/default.nix
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@ -27,7 +27,10 @@ lib.optionalAttrs (stdenv.hostPlatform.isLinux) (
(pkgs.nixos {
system.nixos = dummyVersioning;
boot.loader.grub.enable = false;
fileSystems."/".device = "/dev/null";
fileSystems."/" = {
device = "/dev/null";
fsType = "none";
};
system.stateVersion = lib.trivial.release;
}).toplevel;
}