nixpkgs/nixos/modules/tasks/filesystems.nix
Scott Olson 6d5ed7d971 Make fileSystems example literal.
This fixes the attribute names showing up unquoted in the options documentation.
2016-06-19 01:21:22 -06:00

240 lines
7.5 KiB
Nix
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

{ config, lib, pkgs, utils, ... }:
with lib;
with utils;
let
fileSystems = attrValues config.fileSystems;
prioOption = prio: optionalString (prio != null) " pri=${toString prio}";
fileSystemOpts = { name, config, ... }: {
options = {
mountPoint = mkOption {
example = "/mnt/usb";
type = types.str;
description = "Location of the mounted the file system.";
};
device = mkOption {
default = null;
example = "/dev/sda";
type = types.nullOr types.str;
description = "Location of the device.";
};
label = mkOption {
default = null;
example = "root-partition";
type = types.nullOr types.str;
description = "Label of the device (if any).";
};
fsType = mkOption {
default = "auto";
example = "ext3";
type = types.str;
description = "Type of the file system.";
};
options = mkOption {
default = [ "defaults" ];
example = [ "data=journal" ];
description = "Options used to mount the file system.";
} // (if versionAtLeast lib.nixpkgsVersion "16.09" then {
type = types.listOf types.str;
} else {
type = types.either types.commas (types.listOf types.str);
apply = x: if isList x then x else lib.strings.splitString "," (builtins.trace "warning: passing a comma-separated string for filesystem options is deprecated; use a list of strings instead. This will become a hard error in 16.09." x);
});
autoFormat = mkOption {
default = false;
type = types.bool;
description = ''
If the device does not currently contain a filesystem (as
determined by <command>blkid</command>, then automatically
format it with the filesystem type specified in
<option>fsType</option>. Use with caution.
'';
};
formatOptions = mkOption {
default = "";
type = types.str;
description = ''
If <option>autoFormat</option> option is set specifies
extra options passed to mkfs.
'';
};
autoResize = mkOption {
default = false;
type = types.bool;
description = ''
If set, the filesystem is grown to its maximum size before
being mounted. (This is typically the size of the containing
partition.) This is currently only supported for ext2/3/4
filesystems that are mounted during early boot.
'';
};
noCheck = mkOption {
default = false;
type = types.bool;
description = "Disable running fsck on this filesystem.";
};
};
config = {
mountPoint = mkDefault name;
device = mkIf (config.fsType == "tmpfs") (mkDefault config.fsType);
options = mkIf config.autoResize [ "x-nixos.autoresize" ];
# -F needed to allow bare block device without partitions
formatOptions = mkIf ((builtins.substring 0 3 config.fsType) == "ext") (mkDefault "-F");
};
};
in
{
###### interface
options = {
fileSystems = mkOption {
default = {};
example = literalExample ''
{
"/".device = "/dev/hda1";
"/data" = {
device = "/dev/hda2";
fsType = "ext3";
options = [ "data=journal" ];
};
"/bigdisk".label = "bigdisk";
}
'';
type = types.loaOf types.optionSet;
options = [ fileSystemOpts ];
description = ''
The file systems to be mounted. It must include an entry for
the root directory (<literal>mountPoint = "/"</literal>). Each
entry in the list is an attribute set with the following fields:
<literal>mountPoint</literal>, <literal>device</literal>,
<literal>fsType</literal> (a file system type recognised by
<command>mount</command>; defaults to
<literal>"auto"</literal>), and <literal>options</literal>
(the mount options passed to <command>mount</command> using the
<option>-o</option> flag; defaults to <literal>[ "defaults" ]</literal>).
Instead of specifying <literal>device</literal>, you can also
specify a volume label (<literal>label</literal>) for file
systems that support it, such as ext2/ext3 (see <command>mke2fs
-L</command>).
'';
};
system.fsPackages = mkOption {
internal = true;
default = [ ];
description = "Packages supplying file system mounters and checkers.";
};
boot.supportedFilesystems = mkOption {
default = [ ];
example = [ "btrfs" ];
type = types.listOf types.str;
description = "Names of supported filesystem types.";
};
};
###### implementation
config = {
boot.supportedFilesystems = map (fs: fs.fsType) fileSystems;
# Add the mount helpers to the system path so that `mount' can find them.
system.fsPackages = [ pkgs.dosfstools ];
environment.systemPackages = [ pkgs.fuse ] ++ config.system.fsPackages;
environment.etc.fstab.text =
let
fsToSkipCheck = [ "none" "btrfs" "zfs" "tmpfs" "nfs" "vboxsf" ];
skipCheck = fs: fs.noCheck || fs.device == "none" || builtins.elem fs.fsType fsToSkipCheck;
in ''
# This is a generated file. Do not edit!
# Filesystems.
${flip concatMapStrings fileSystems (fs:
(if fs.device != null then fs.device
else if fs.label != null then "/dev/disk/by-label/${fs.label}"
else throw "No device specified for mount point ${fs.mountPoint}.")
+ " " + fs.mountPoint
+ " " + fs.fsType
+ " " + builtins.concatStringsSep "," fs.options
+ " 0"
+ " " + (if skipCheck fs then "0" else
if fs.mountPoint == "/" then "1" else "2")
+ "\n"
)}
# Swap devices.
${flip concatMapStrings config.swapDevices (sw:
"${sw.realDevice} none swap${prioOption sw.priority}\n"
)}
'';
# Provide a target that pulls in all filesystems.
systemd.targets.fs =
{ description = "All File Systems";
wants = [ "local-fs.target" "remote-fs.target" ];
};
# Emit systemd services to format requested filesystems.
systemd.services =
let
formatDevice = fs:
let
mountPoint' = escapeSystemdPath fs.mountPoint;
device' = escapeSystemdPath fs.device;
in nameValuePair "mkfs-${device'}"
{ description = "Initialisation of Filesystem ${fs.device}";
wantedBy = [ "${mountPoint'}.mount" ];
before = [ "${mountPoint'}.mount" "systemd-fsck@${device'}.service" ];
requires = [ "${device'}.device" ];
after = [ "${device'}.device" ];
path = [ pkgs.utillinux ] ++ config.system.fsPackages;
script =
''
if ! [ -e "${fs.device}" ]; then exit 1; fi
# FIXME: this is scary. The test could be more robust.
type=$(blkid -p -s TYPE -o value "${fs.device}" || true)
if [ -z "$type" ]; then
echo "creating ${fs.fsType} filesystem on ${fs.device}..."
mkfs.${fs.fsType} ${fs.formatOptions} "${fs.device}"
fi
'';
unitConfig.RequiresMountsFor = [ "${dirOf fs.device}" ];
unitConfig.DefaultDependencies = false; # needed to prevent a cycle
serviceConfig.Type = "oneshot";
};
in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems));
};
}