0eb6d0735f
Assert that autoResize is only used when fsType is explicitly set to a supported filesystem: if it's set to "auto", the default, the required resizing tools won't be copied into the initrd even if the actual filesystem is supported.
326 lines
12 KiB
Nix
326 lines
12 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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with utils;
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let
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addCheckDesc = desc: elemType: check: types.addCheck elemType check
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// { description = "${elemType.description} (with check: ${desc})"; };
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nonEmptyStr = addCheckDesc "non-empty" types.str
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(x: x != "" && ! (all (c: c == " " || c == "\t") (stringToCharacters x)));
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fileSystems' = toposort fsBefore (attrValues config.fileSystems);
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fileSystems = if fileSystems' ? "result"
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then # use topologically sorted fileSystems everywhere
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fileSystems'.result
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else # the assertion below will catch this,
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# but we fall back to the original order
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# anyway so that other modules could check
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# their assertions too
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(attrValues config.fileSystems);
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prioOption = prio: optionalString (prio != null) " pri=${toString prio}";
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specialFSTypes = [ "proc" "sysfs" "tmpfs" "ramfs" "devtmpfs" "devpts" ];
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coreFileSystemOpts = { name, config, ... }: {
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options = {
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mountPoint = mkOption {
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example = "/mnt/usb";
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type = nonEmptyStr;
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description = "Location of the mounted the file system.";
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};
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device = mkOption {
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default = null;
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example = "/dev/sda";
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type = types.nullOr nonEmptyStr;
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description = "Location of the device.";
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};
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fsType = mkOption {
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default = "auto";
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example = "ext3";
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type = nonEmptyStr;
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description = "Type of the file system.";
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};
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options = mkOption {
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default = [ "defaults" ];
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example = [ "data=journal" ];
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description = "Options used to mount the file system.";
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type = types.listOf nonEmptyStr;
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};
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};
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config = {
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mountPoint = mkDefault name;
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device = mkIf (elem config.fsType specialFSTypes) (mkDefault config.fsType);
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};
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};
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fileSystemOpts = { config, ... }: {
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options = {
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label = mkOption {
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default = null;
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example = "root-partition";
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type = types.nullOr nonEmptyStr;
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description = "Label of the device (if any).";
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};
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autoFormat = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If the device does not currently contain a filesystem (as
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determined by <command>blkid</command>, then automatically
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format it with the filesystem type specified in
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<option>fsType</option>. Use with caution.
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'';
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};
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formatOptions = mkOption {
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default = "";
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type = types.str;
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description = ''
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If <option>autoFormat</option> option is set specifies
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extra options passed to mkfs.
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'';
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};
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autoResize = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, the filesystem is grown to its maximum size before
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being mounted. (This is typically the size of the containing
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partition.) This is currently only supported for ext2/3/4
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filesystems that are mounted during early boot.
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'';
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};
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noCheck = mkOption {
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default = false;
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type = types.bool;
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description = "Disable running fsck on this filesystem.";
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};
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};
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config = let
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defaultFormatOptions =
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# -F needed to allow bare block device without partitions
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if (builtins.substring 0 3 config.fsType) == "ext" then "-F"
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# -q needed for non-interactive operations
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else if config.fsType == "jfs" then "-q"
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# (same here)
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else if config.fsType == "reiserfs" then "-q"
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else null;
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in {
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options = mkIf config.autoResize [ "x-nixos.autoresize" ];
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formatOptions = mkIf (defaultFormatOptions != null) (mkDefault defaultFormatOptions);
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};
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};
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# Makes sequence of `specialMount device mountPoint options fsType` commands.
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# `systemMount` should be defined in the sourcing script.
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makeSpecialMounts = mounts:
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pkgs.writeText "mounts.sh" (concatMapStringsSep "\n" (mount: ''
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specialMount "${mount.device}" "${mount.mountPoint}" "${concatStringsSep "," mount.options}" "${mount.fsType}"
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'') mounts);
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in
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{
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###### interface
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options = {
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fileSystems = mkOption {
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default = {};
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example = literalExample ''
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{
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"/".device = "/dev/hda1";
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"/data" = {
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device = "/dev/hda2";
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fsType = "ext3";
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options = [ "data=journal" ];
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};
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"/bigdisk".label = "bigdisk";
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}
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'';
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type = types.loaOf (types.submodule [coreFileSystemOpts fileSystemOpts]);
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description = ''
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The file systems to be mounted. It must include an entry for
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the root directory (<literal>mountPoint = "/"</literal>). Each
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entry in the list is an attribute set with the following fields:
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<literal>mountPoint</literal>, <literal>device</literal>,
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<literal>fsType</literal> (a file system type recognised by
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<command>mount</command>; defaults to
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<literal>"auto"</literal>), and <literal>options</literal>
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(the mount options passed to <command>mount</command> using the
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<option>-o</option> flag; defaults to <literal>[ "defaults" ]</literal>).
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Instead of specifying <literal>device</literal>, you can also
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specify a volume label (<literal>label</literal>) for file
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systems that support it, such as ext2/ext3 (see <command>mke2fs
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-L</command>).
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'';
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};
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system.fsPackages = mkOption {
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internal = true;
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default = [ ];
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description = "Packages supplying file system mounters and checkers.";
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};
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boot.supportedFilesystems = mkOption {
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default = [ ];
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example = [ "btrfs" ];
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type = types.listOf types.str;
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description = "Names of supported filesystem types.";
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};
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boot.specialFileSystems = mkOption {
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default = {};
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type = types.loaOf (types.submodule coreFileSystemOpts);
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internal = true;
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description = ''
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Special filesystems that are mounted very early during boot.
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'';
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};
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};
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###### implementation
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config = {
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assertions = let
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ls = sep: concatMapStringsSep sep (x: x.mountPoint);
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notAutoResizable = fs: fs.autoResize && !(hasPrefix "ext" fs.fsType || fs.fsType == "f2fs");
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in [
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{ assertion = ! (fileSystems' ? "cycle");
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message = "The ‘fileSystems’ option can't be topologically sorted: mountpoint dependency path ${ls " -> " fileSystems'.cycle} loops to ${ls ", " fileSystems'.loops}";
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}
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{ assertion = ! (any notAutoResizable fileSystems);
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message = let
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fs = head (filter notAutoResizable fileSystems);
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in
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"Mountpoint '${fs.mountPoint}': 'autoResize = true' is not supported for 'fsType = \"${fs.fsType}\"':${if fs.fsType == "auto" then " fsType has to be explicitly set and" else ""} only the ext filesystems and f2fs support it.";
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}
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];
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# Export for use in other modules
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system.build.fileSystems = fileSystems;
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system.build.earlyMountScript = makeSpecialMounts (toposort fsBefore (attrValues config.boot.specialFileSystems)).result;
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boot.supportedFilesystems = map (fs: fs.fsType) fileSystems;
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# Add the mount helpers to the system path so that `mount' can find them.
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system.fsPackages = [ pkgs.dosfstools ];
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environment.systemPackages = with pkgs; [ fuse3 fuse ] ++ config.system.fsPackages;
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environment.etc.fstab.text =
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let
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fsToSkipCheck = [ "none" "bindfs" "btrfs" "zfs" "tmpfs" "nfs" "vboxsf" "glusterfs" ];
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skipCheck = fs: fs.noCheck || fs.device == "none" || builtins.elem fs.fsType fsToSkipCheck;
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# https://wiki.archlinux.org/index.php/fstab#Filepath_spaces
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escape = string: builtins.replaceStrings [ " " "\t" ] [ "\\040" "\\011" ] string;
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in ''
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# This is a generated file. Do not edit!
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#
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# To make changes, edit the fileSystems and swapDevices NixOS options
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# in your /etc/nixos/configuration.nix file.
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# Filesystems.
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${concatMapStrings (fs:
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(if fs.device != null then escape fs.device
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else if fs.label != null then "/dev/disk/by-label/${escape fs.label}"
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else throw "No device specified for mount point ‘${fs.mountPoint}’.")
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+ " " + escape fs.mountPoint
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+ " " + fs.fsType
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+ " " + builtins.concatStringsSep "," fs.options
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+ " 0"
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+ " " + (if skipCheck fs then "0" else
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if fs.mountPoint == "/" then "1" else "2")
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+ "\n"
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) fileSystems}
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# Swap devices.
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${flip concatMapStrings config.swapDevices (sw:
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"${sw.realDevice} none swap${prioOption sw.priority}\n"
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)}
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'';
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# Provide a target that pulls in all filesystems.
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systemd.targets.fs =
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{ description = "All File Systems";
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wants = [ "local-fs.target" "remote-fs.target" ];
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};
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# Emit systemd services to format requested filesystems.
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systemd.services =
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let
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formatDevice = fs:
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let
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mountPoint' = "${escapeSystemdPath fs.mountPoint}.mount";
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device' = escapeSystemdPath fs.device;
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device'' = "${device'}.device";
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in nameValuePair "mkfs-${device'}"
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{ description = "Initialisation of Filesystem ${fs.device}";
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wantedBy = [ mountPoint' ];
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before = [ mountPoint' "systemd-fsck@${device'}.service" ];
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requires = [ device'' ];
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after = [ device'' ];
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path = [ pkgs.utillinux ] ++ config.system.fsPackages;
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script =
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''
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if ! [ -e "${fs.device}" ]; then exit 1; fi
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# FIXME: this is scary. The test could be more robust.
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type=$(blkid -p -s TYPE -o value "${fs.device}" || true)
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if [ -z "$type" ]; then
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echo "creating ${fs.fsType} filesystem on ${fs.device}..."
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mkfs.${fs.fsType} ${fs.formatOptions} "${fs.device}"
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fi
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'';
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unitConfig.RequiresMountsFor = [ "${dirOf fs.device}" ];
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unitConfig.DefaultDependencies = false; # needed to prevent a cycle
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serviceConfig.Type = "oneshot";
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};
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in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems));
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# Sync mount options with systemd's src/core/mount-setup.c: mount_table.
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boot.specialFileSystems = {
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"/proc" = { fsType = "proc"; options = [ "nosuid" "noexec" "nodev" ]; };
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"/run" = { fsType = "tmpfs"; options = [ "nosuid" "nodev" "strictatime" "mode=755" "size=${config.boot.runSize}" ]; };
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"/dev" = { fsType = "devtmpfs"; options = [ "nosuid" "strictatime" "mode=755" "size=${config.boot.devSize}" ]; };
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"/dev/shm" = { fsType = "tmpfs"; options = [ "nosuid" "nodev" "strictatime" "mode=1777" "size=${config.boot.devShmSize}" ]; };
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"/dev/pts" = { fsType = "devpts"; options = [ "nosuid" "noexec" "mode=620" "ptmxmode=0666" "gid=${toString config.ids.gids.tty}" ]; };
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# To hold secrets that shouldn't be written to disk (generally used for NixOps, harmless elsewhere)
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"/run/keys" = { fsType = "ramfs"; options = [ "nosuid" "nodev" "mode=750" "gid=${toString config.ids.gids.keys}" ]; };
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} // optionalAttrs (!config.boot.isContainer) {
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# systemd-nspawn populates /sys by itself, and remounting it causes all
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# kinds of weird issues (most noticeably, waiting for host disk device
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# nodes).
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"/sys" = { fsType = "sysfs"; options = [ "nosuid" "noexec" "nodev" ]; };
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};
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};
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}
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