nixos/filesystems: make supportedFilesystems an attrset

this lets us *dis*able filesystem explicitly, as is required by e.g. the
zfs-less installer images. currently that specifically is only easily
possible by adding an overlay that stubs out `zfs`, with the obvious
side-effect of also removing tooling that could run without the kernel
module loaded.

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -105,6 +105,8 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
 
 - `nitter` requires a `guest_accounts.jsonl` to be provided as a path or loaded into the default location at `/var/lib/nitter/guest_accounts.jsonl`. See [Guest Account Branch Deployment](https://github.com/zedeus/nitter/wiki/Guest-Account-Branch-Deployment) for details.
 
+- `boot.supportedFilesystems` and `boot.initrd.supportedFilesystems` are now attribute sets instead of lists. Assignment from lists as done previously is still supported, but checking whether a filesystem is enabled must now by done using `supportedFilesystems.fs or false` instead of using `lib.elem "fs" supportedFilesystems` as was done previously.
+
 - `services.aria2.rpcSecret` has been replaced with `services.aria2.rpcSecretFile`.
   This was done so that secrets aren't stored in the world-readable nix store.
   To migrate, you will have create a file with the same exact string, and change

nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix

@@ -1,15 +1,7 @@
-{ pkgs, ... }:
+{ lib, ... }:
 
 {
   imports = [ ./installation-cd-minimal-new-kernel.nix ];
 
-  # Makes `availableOn` fail for zfs, see <nixos/modules/profiles/base.nix>.
-  # This is a workaround since we cannot remove the `"zfs"` string from `supportedFilesystems`.
-  # The proper fix would be to make `supportedFilesystems` an attrset with true/false which we
-  # could then `lib.mkForce false`
-  nixpkgs.overlays = [(final: super: {
-    zfs = super.zfs.overrideAttrs(_: {
-      meta.platforms = [];
-    });
-  })];
+  boot.supportedFilesystems.zfs = lib.mkForce false;
 }

nixos/modules/installer/sd-card/sd-image-aarch64-new-kernel-no-zfs-installer.nix

@@ -1,15 +1,7 @@
-{ pkgs, ... }:
+{ lib, ... }:
 
 {
   imports = [ ./sd-image-aarch64-new-kernel-installer.nix ];
 
-  # Makes `availableOn` fail for zfs, see <nixos/modules/profiles/base.nix>.
-  # This is a workaround since we cannot remove the `"zfs"` string from `supportedFilesystems`.
-  # The proper fix would be to make `supportedFilesystems` an attrset with true/false which we
-  # could then `lib.mkForce false`
-  nixpkgs.overlays = [(final: super: {
-    zfs = super.zfs.overrideAttrs(_: {
-      meta.platforms = [];
-    });
-  })];
+  boot.supportedFilesystems.zfs = lib.mkForce false;
 }

nixos/modules/system/boot/stage-1.nix

@@ -3,7 +3,7 @@
 # the modules necessary to mount the root file system, then calls the
 # init in the root file system to start the second boot stage.
 
-{ config, lib, utils, pkgs, ... }:
+{ config, options, lib, utils, pkgs, ... }:
 
 with lib;
 
@@ -636,10 +636,8 @@ in
       };
 
     boot.initrd.supportedFilesystems = mkOption {
-      default = [ ];
-      example = [ "btrfs" ];
-      type = types.listOf types.str;
-      description = lib.mdDoc "Names of supported filesystem types in the initial ramdisk.";
+      default = { };
+      inherit (options.boot.supportedFilesystems) example type description;
     };
 
     boot.initrd.verbose = mkOption {

nixos/modules/tasks/filesystems.nix

@@ -246,10 +246,23 @@ in
     };
 
     boot.supportedFilesystems = mkOption {
-      default = [ ];
-      example = [ "btrfs" ];
-      type = types.listOf types.str;
-      description = lib.mdDoc "Names of supported filesystem types.";
+      default = { };
+      example = lib.literalExpression ''
+        {
+          btrfs = true;
+          zfs = lib.mkForce false;
+        }
+      '';
+      type = types.coercedTo
+        (types.listOf types.str)
+        (enabled: lib.listToAttrs (map (fs: lib.nameValuePair fs true) enabled))
+        (types.attrsOf types.bool);
+      description = lib.mdDoc ''
+        Names of supported filesystem types, or an attribute set of file system types
+        and their state. The set form may be used together with `lib.mkForce` to
+        explicitly disable support for specific filesystems, e.g. to disable ZFS
+        with an unsupported kernel.
+      '';
     };
 
     boot.specialFileSystems = mkOption {

nixos/modules/tasks/filesystems/apfs.nix

@@ -4,12 +4,12 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "apfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.apfs or false;
 
 in
 
 {
-  config = mkIf (any (fs: fs == "apfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.apfs or false) {
 
     system.fsPackages = [ pkgs.apfsprogs ];
 

nixos/modules/tasks/filesystems/bcachefs.nix

@@ -118,7 +118,7 @@ let
 in
 
 {
-  config = lib.mkIf (lib.elem "bcachefs" config.boot.supportedFilesystems) (lib.mkMerge [
+  config = lib.mkIf (config.boot.supportedFilesystems.bcachefs or false) (lib.mkMerge [
     {
       inherit assertions;
       # needed for systemd-remount-fs
@@ -133,7 +133,7 @@ in
       };
     }
 
-    (lib.mkIf ((lib.elem "bcachefs" config.boot.initrd.supportedFilesystems) || (bootFs != {})) {
+    (lib.mkIf ((config.boot.initrd.supportedFilesystems.bcachefs or false) || (bootFs != {})) {
       inherit assertions;
       # chacha20 and poly1305 are required only for decryption attempts
       boot.initrd.availableKernelModules = [ "bcachefs" "sha256" "chacha20" "poly1305" ];

nixos/modules/tasks/filesystems/btrfs.nix

@@ -4,8 +4,8 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "btrfs") config.boot.initrd.supportedFilesystems;
-  inSystem = any (fs: fs == "btrfs") config.boot.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.btrfs or false;
+  inSystem = config.boot.supportedFilesystems.btrfs or false;
 
   cfgScrub = config.services.btrfs.autoScrub;
 

nixos/modules/tasks/filesystems/cifs.nix

@@ -4,14 +4,14 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "cifs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.cifs or false;
 
 in
 
 {
   config = {
 
-    system.fsPackages = mkIf (any (fs: fs == "cifs") config.boot.supportedFilesystems) [ pkgs.cifs-utils ];
+    system.fsPackages = mkIf (config.boot.supportedFilesystems.cifs or false) [ pkgs.cifs-utils ];
 
     boot.initrd.availableKernelModules = mkIf inInitrd
       [ "cifs" "nls_utf8" "hmac" "md4" "ecb" "des_generic" "sha256" ];

nixos/modules/tasks/filesystems/ecryptfs.nix

@@ -4,7 +4,7 @@
 with lib;
 
 {
-  config = mkIf (any (fs: fs == "ecryptfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.ecryptfs or false) {
     system.fsPackages = [ pkgs.ecryptfs ];
     security.wrappers = {
       "mount.ecryptfs_private" =

nixos/modules/tasks/filesystems/erofs.nix

@@ -2,8 +2,8 @@
 
 let
 
-  inInitrd = lib.any (fs: fs == "erofs") config.boot.initrd.supportedFilesystems;
-  inSystem = lib.any (fs: fs == "erofs") config.boot.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.erofs or false;
+  inSystem = config.boot.supportedFilesystems.erofs or false;
 
 in
 

nixos/modules/tasks/filesystems/exfat.nix

@@ -3,7 +3,7 @@
 with lib;
 
 {
-  config = mkIf (any (fs: fs == "exfat") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.exfat or false) {
     system.fsPackages = if config.boot.kernelPackages.kernelOlder "5.7" then [
       pkgs.exfat # FUSE
     ] else [

nixos/modules/tasks/filesystems/ext.nix

@@ -2,8 +2,10 @@
 
 let
 
-  inInitrd = lib.any (fs: fs == "ext2" || fs == "ext3" || fs == "ext4") config.boot.initrd.supportedFilesystems;
-  inSystem = lib.any (fs: fs == "ext2" || fs == "ext3" || fs == "ext4") config.boot.supportedFilesystems;
+  hasExtX = s: s.ext2 or s.ext3 or s.ext4 or false;
+
+  inInitrd = hasExtX config.boot.initrd.supportedFilesystems;
+  inSystem = hasExtX config.boot.supportedFilesystems;
 
 in
 

nixos/modules/tasks/filesystems/f2fs.nix

@@ -3,11 +3,10 @@
 with lib;
 
 let
-  inInitrd = any (fs: fs == "f2fs") config.boot.initrd.supportedFilesystems;
-  fileSystems = filter (x: x.fsType == "f2fs") config.system.build.fileSystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.f2fs or false;
 in
 {
-  config = mkIf (any (fs: fs == "f2fs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.f2fs or false) {
 
     system.fsPackages = [ pkgs.f2fs-tools ];
 

nixos/modules/tasks/filesystems/glusterfs.nix

@@ -3,7 +3,7 @@
 with lib;
 
 {
-  config = mkIf (any (fs: fs == "glusterfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.glusterfs or false) {
 
     system.fsPackages = [ pkgs.glusterfs ];
 

nixos/modules/tasks/filesystems/jfs.nix

@@ -3,10 +3,10 @@
 with lib;
 
 let
-  inInitrd = any (fs: fs == "jfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.jfs or false;
 in
 {
-  config = mkIf (any (fs: fs == "jfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.jfs or false) {
 
     system.fsPackages = [ pkgs.jfsutils ];
 

nixos/modules/tasks/filesystems/nfs.nix

@@ -4,7 +4,7 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "nfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.nfs or false;
 
   nfsStateDir = "/var/lib/nfs";
 
@@ -58,7 +58,7 @@ in
 
   ###### implementation
 
-  config = mkIf (any (fs: fs == "nfs" || fs == "nfs4") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.nfs or config.boot.supportedFilesystems.nfs4 or false) {
 
     services.rpcbind.enable = true;
 

nixos/modules/tasks/filesystems/ntfs.nix

@@ -3,7 +3,7 @@
 with lib;
 
 {
-  config = mkIf (any (fs: fs == "ntfs" || fs == "ntfs-3g") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.ntfs or config.boot.supportedFilesystems.ntfs-3g or false) {
 
     system.fsPackages = [ pkgs.ntfs3g ];
 

nixos/modules/tasks/filesystems/reiserfs.nix

@@ -4,12 +4,12 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "reiserfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.reiserfs or false;
 
 in
 
 {
-  config = mkIf (any (fs: fs == "reiserfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.reiserfs or false) {
 
     system.fsPackages = [ pkgs.reiserfsprogs ];
 

nixos/modules/tasks/filesystems/squashfs.nix

@@ -2,7 +2,7 @@
 
 let
 
-  inInitrd = lib.any (fs: fs == "squashfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.squashfs or false;
 
 in
 

nixos/modules/tasks/filesystems/sshfs.nix

@@ -1,7 +1,11 @@
 { config, lib, pkgs, ... }:
 
 {
-  config = lib.mkIf (lib.any (fs: fs == "sshfs" || fs == "fuse.sshfs") config.boot.supportedFilesystems) {
-    system.fsPackages = [ pkgs.sshfs ];
-  };
+  config = lib.mkIf
+    (config.boot.supportedFilesystems.sshfs
+      or config.boot.supportedFilesystems."fuse.sshfs"
+      or false)
+    {
+      system.fsPackages = [ pkgs.sshfs ];
+    };
 }

nixos/modules/tasks/filesystems/unionfs-fuse.nix

@@ -3,7 +3,7 @@
 {
   config = lib.mkMerge [
 
-    (lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.initrd.supportedFilesystems) {
+    (lib.mkIf (config.boot.initrd.supportedFilesystems.unionfs-fuse or false) {
       boot.initrd.kernelModules = [ "fuse" ];
 
       boot.initrd.extraUtilsCommands = lib.mkIf (!config.boot.initrd.systemd.enable) ''
@@ -35,7 +35,7 @@
       };
     })
 
-    (lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.supportedFilesystems) {
+    (lib.mkIf (config.boot.supportedFilesystems.unionfs-fuse or false) {
       system.fsPackages = [ pkgs.unionfs-fuse ];
     })
 

nixos/modules/tasks/filesystems/vboxsf.nix

@@ -4,7 +4,7 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "vboxsf") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.vboxsf or false;
 
   package = pkgs.runCommand "mount.vboxsf" { preferLocalBuild = true; } ''
     mkdir -p $out/bin
@@ -13,7 +13,7 @@ let
 in
 
 {
-  config = mkIf (any (fs: fs == "vboxsf") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.vboxsf or false) {
 
     system.fsPackages = [ package ];
 

nixos/modules/tasks/filesystems/vfat.nix

@@ -4,12 +4,12 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "vfat") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.vfat or false;
 
 in
 
 {
-  config = mkIf (any (fs: fs == "vfat") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.vfat or false) {
 
     system.fsPackages = [ pkgs.dosfstools pkgs.mtools ];
 

nixos/modules/tasks/filesystems/xfs.nix

@@ -4,12 +4,12 @@ with lib;
 
 let
 
-  inInitrd = any (fs: fs == "xfs") config.boot.initrd.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.xfs or false;
 
 in
 
 {
-  config = mkIf (any (fs: fs == "xfs") config.boot.supportedFilesystems) {
+  config = mkIf (config.boot.supportedFilesystems.xfs or false) {
 
     system.fsPackages = [ pkgs.xfsprogs.bin ];
 

nixos/modules/tasks/filesystems/zfs.nix

@@ -20,8 +20,8 @@ let
   clevisDatasets = map (e: e.device) (filter (e: e.device != null && (hasAttr e.device config.boot.initrd.clevis.devices) && e.fsType == "zfs" && (fsNeededForBoot e)) config.system.build.fileSystems);
 
 
-  inInitrd = any (fs: fs == "zfs") config.boot.initrd.supportedFilesystems;
-  inSystem = any (fs: fs == "zfs") config.boot.supportedFilesystems;
+  inInitrd = config.boot.initrd.supportedFilesystems.zfs or false;
+  inSystem = config.boot.supportedFilesystems.zfs or false;
 
   autosnapPkg = pkgs.zfstools.override {
     zfs = cfgZfs.package;

nixos/modules/virtualisation/cri-o.nix

@@ -6,7 +6,7 @@ let
 
   crioPackage = pkgs.cri-o.override {
     extraPackages = cfg.extraPackages
-      ++ lib.optional (builtins.elem "zfs" config.boot.supportedFilesystems) config.boot.zfs.package;
+      ++ lib.optional (config.boot.supportedFilesystems.zfs or false) config.boot.zfs.package;
   };
 
   format = pkgs.formats.toml { };

nixos/modules/virtualisation/podman/default.nix

@@ -9,7 +9,7 @@ let
     extraPackages = cfg.extraPackages
       # setuid shadow
       ++ [ "/run/wrappers" ]
-      ++ lib.optional (builtins.elem "zfs" config.boot.supportedFilesystems) config.boot.zfs.package;
+      ++ lib.optional (config.boot.supportedFilesystems.zfs or false) config.boot.zfs.package;
   });
 
   # Provides a fake "docker" binary mapping to podman

nixos/tests/installer.nix

@@ -526,8 +526,7 @@ let
             curl
           ]
           ++ optionals (bootLoader == "grub") (let
-            zfsSupport = lib.any (x: x == "zfs")
-              (extraInstallerConfig.boot.supportedFilesystems or []);
+            zfsSupport = extraInstallerConfig.boot.supportedFilesystems.zfs or false;
           in [
             (pkgs.grub2.override { inherit zfsSupport; })
             (pkgs.grub2_efi.override { inherit zfsSupport; })