nixos: Use systemd-growfs for autoResize

nixos/doc/manual/release-notes/rl-2311.section.md

@@ -30,6 +30,8 @@
 
 - `fileSystems.<name>.autoFormat` now uses `systemd-makefs`, which does not accept formatting options. Therefore, `fileSystems.<name>.formatOptions` has been removed.
 
+- `fileSystems.<name>.autoResize` now uses `systemd-growfs` to resize the file system online in stage 2. This means that `f2fs` and `ext2` can no longer be auto resized, while `xfs` and `btrfs` now can be.
+
 ## Other Notable Changes {#sec-release-23.11-notable-changes}
 
 - The Cinnamon module now enables XDG desktop integration by default. If you are experiencing collisions related to xdg-desktop-portal-gtk you can safely remove `xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];` from your NixOS configuration.

nixos/modules/system/boot/stage-1-init.sh

@@ -374,22 +374,6 @@ mountFS() {
 
     checkFS "$device" "$fsType"
 
-    # Optionally resize the filesystem.
-    case $options in
-        *x-nixos.autoresize*)
-            if [ "$fsType" = ext2 -o "$fsType" = ext3 -o "$fsType" = ext4 ]; then
-                modprobe "$fsType"
-                echo "resizing $device..."
-                e2fsck -fp "$device"
-                resize2fs "$device"
-            elif [ "$fsType" = f2fs ]; then
-                echo "resizing $device..."
-                fsck.f2fs -fp "$device"
-                resize.f2fs "$device"
-            fi
-            ;;
-    esac
-
     # Create backing directories for overlayfs
     if [ "$fsType" = overlay ]; then
         for i in upper work; do

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

@@ -150,12 +150,6 @@ let
       copy_bin_and_libs ${pkgs.kmod}/bin/kmod
       ln -sf kmod $out/bin/modprobe
 
-      # Copy resize2fs if any ext* filesystems are to be resized
-      ${optionalString (any (fs: fs.autoResize && (lib.hasPrefix "ext" fs.fsType)) fileSystems) ''
-        # We need mke2fs in the initrd.
-        copy_bin_and_libs ${pkgs.e2fsprogs}/sbin/resize2fs
-      ''}
-
       # Copy multipath.
       ${optionalString config.services.multipath.enable ''
         copy_bin_and_libs ${config.services.multipath.package}/bin/multipath

nixos/modules/system/boot/systemd/initrd.nix

@@ -56,7 +56,6 @@ let
     "systemd-ask-password-console.path"
     "systemd-ask-password-console.service"
     "systemd-fsck@.service"
-    "systemd-growfs@.service"
     "systemd-halt.service"
     "systemd-hibernate-resume@.service"
     "systemd-journald-audit.socket"
@@ -93,7 +92,6 @@ let
   fileSystems = filter utils.fsNeededForBoot config.system.build.fileSystems;
 
   needMakefs = lib.any (fs: fs.autoFormat) fileSystems;
-  needGrowfs = lib.any (fs: fs.autoResize) fileSystems;
 
   kernel-name = config.boot.kernelPackages.kernel.name or "kernel";
   modulesTree = config.system.modulesTree.override { name = kernel-name + "-modules"; };
@@ -400,7 +398,6 @@ in {
       storePaths = [
         # systemd tooling
         "${cfg.package}/lib/systemd/systemd-fsck"
-        (lib.mkIf needGrowfs "${cfg.package}/lib/systemd/systemd-growfs")
         "${cfg.package}/lib/systemd/systemd-hibernate-resume"
         "${cfg.package}/lib/systemd/systemd-journald"
         (lib.mkIf needMakefs "${cfg.package}/lib/systemd/systemd-makefs")

nixos/modules/tasks/filesystems.nix

@@ -137,7 +137,7 @@ let
     };
 
     config.options = mkMerge [
-      (mkIf config.autoResize [ "x-nixos.autoresize" ])
+      (mkIf config.autoResize [ "x-systemd.growfs" ])
       (mkIf config.autoFormat [ "x-systemd.makefs" ])
       (mkIf (utils.fsNeededForBoot config) [ "x-initrd.mount" ])
     ];
@@ -187,22 +187,20 @@ let
       skipCheck = fs: fs.noCheck || fs.device == "none" || builtins.elem fs.fsType fsToSkipCheck || isBindMount fs;
       # https://wiki.archlinux.org/index.php/fstab#Filepath_spaces
       escape = string: builtins.replaceStrings [ " " "\t" ] [ "\\040" "\\011" ] string;
-    in fstabFileSystems: { rootPrefix ? "", extraOpts ? (fs: []) }: concatMapStrings (fs:
+    in fstabFileSystems: { rootPrefix ? "" }: concatMapStrings (fs:
       (optionalString (isBindMount fs) (escape rootPrefix))
       + (if fs.device != null then escape fs.device
          else if fs.label != null then "/dev/disk/by-label/${escape fs.label}"
          else throw "No device specified for mount point ‘${fs.mountPoint}’.")
       + " " + escape fs.mountPoint
       + " " + fs.fsType
-      + " " + escape (builtins.concatStringsSep "," (fs.options ++ (extraOpts fs)))
+      + " " + escape (builtins.concatStringsSep "," fs.options)
       + " 0 " + (if skipCheck fs then "0" else if fs.mountPoint == "/" then "1" else "2")
       + "\n"
     ) fstabFileSystems;
 
     initrdFstab = pkgs.writeText "initrd-fstab" (makeFstabEntries (filter utils.fsNeededForBoot fileSystems) {
       rootPrefix = "/sysroot";
-      extraOpts = fs:
-        (optional fs.autoResize "x-systemd.growfs");
     });
 
 in
@@ -304,7 +302,13 @@ in
 
     assertions = let
       ls = sep: concatMapStringsSep sep (x: x.mountPoint);
-      notAutoResizable = fs: fs.autoResize && !(hasPrefix "ext" fs.fsType || fs.fsType == "f2fs");
+      resizableFSes = [
+        "ext3"
+        "ext4"
+        "btrfs"
+        "xfs"
+      ];
+      notAutoResizable = fs: fs.autoResize && !(builtins.elem fs.fsType resizableFSes);
     in [
       { assertion = ! (fileSystems' ? cycle);
         message = "The ‘fileSystems’ option can't be topologically sorted: mountpoint dependency path ${ls " -> " fileSystems'.cycle} loops to ${ls ", " fileSystems'.loops}";
@@ -312,8 +316,11 @@ in
       { assertion = ! (any notAutoResizable fileSystems);
         message = let
           fs = head (filter notAutoResizable fileSystems);
-        in
-          "Mountpoint '${fs.mountPoint}': 'autoResize = true' is not supported for 'fsType = \"${fs.fsType}\"':${optionalString (fs.fsType == "auto") " fsType has to be explicitly set and"} only the ext filesystems and f2fs support it.";
+        in ''
+          Mountpoint '${fs.mountPoint}': 'autoResize = true' is not supported for 'fsType = "${fs.fsType}"'
+          ${optionalString (fs.fsType == "auto") "fsType has to be explicitly set and"}
+          only the following support it: ${lib.concatStringsSep ", " resizableFSes}.
+        '';
       }
       {
         assertion = ! (any (fs: fs.formatOptions != null) fileSystems);

nixos/modules/tasks/filesystems/f2fs.nix

@@ -15,11 +15,6 @@ in
 
     boot.initrd.extraUtilsCommands = mkIf (inInitrd && !config.boot.initrd.systemd.enable) ''
       copy_bin_and_libs ${pkgs.f2fs-tools}/sbin/fsck.f2fs
-      ${optionalString (any (fs: fs.autoResize) fileSystems) ''
-        # We need f2fs-tools' tools to resize filesystems
-        copy_bin_and_libs ${pkgs.f2fs-tools}/sbin/resize.f2fs
-      ''}
-
     '';
   };
 }