nixpkgs/nixos/modules/tasks/filesystems.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00

217 lines
6.4 KiB
Nix

{ config, lib, pkgs, utils, ... }:
with lib;
with utils;
let
fileSystems = attrValues config.fileSystems;
prioOption = prio: optionalString (prio !=null) " pri=${toString prio}";
fileSystemOpts = { name, ... }: {
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.uniq (types.nullOr types.string);
description = "Location of the device.";
};
label = mkOption {
default = null;
example = "root-partition";
type = types.uniq (types.nullOr types.string);
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,relatime";
example = "data=journal";
type = types.commas;
description = "Options used to mount the file system.";
};
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.
'';
};
noCheck = mkOption {
default = false;
type = types.bool;
description = "Disable running fsck on this filesystem.";
};
};
config = {
mountPoint = mkDefault name;
};
};
in
{
###### interface
options = {
fileSystems = mkOption {
default = {};
example = {
"/".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.string;
description = "Names of supported filesystem types.";
};
boot.initrd.supportedFilesystems = mkOption {
default = [ ];
example = [ "btrfs" ];
type = types.listOf types.string;
description = "Names of supported filesystem types in the initial ramdisk.";
};
};
###### implementation
config = {
boot.supportedFilesystems = map (fs: fs.fsType) fileSystems;
boot.initrd.supportedFilesystems =
map (fs: fs.fsType)
(filter (fs: fs.mountPoint == "/" || fs.neededForBoot) fileSystems);
# Add the mount helpers to the system path so that `mount' can find them.
system.fsPackages = [ pkgs.dosfstools ];
environment.systemPackages =
[ pkgs.ntfs3g pkgs.cifs_utils pkgs.fuse ]
++ config.system.fsPackages;
environment.etc.fstab.text =
''
# This is a generated file. Do not edit!
# Filesystems.
${flip concatMapStrings fileSystems (fs:
(if fs.device != null then fs.device else "/dev/disk/by-label/${fs.label}")
+ " " + fs.mountPoint
+ " " + fs.fsType
+ " " + fs.options
+ " 0"
+ " " + (if fs.fsType == "none" || fs.device == "none" || fs.fsType == "btrfs" || fs.fsType == "tmpfs" || fs.noCheck then "0" else
if fs.mountPoint == "/" then "1" else "2")
+ "\n"
)}
# Swap devices.
${flip concatMapStrings config.swapDevices (sw:
"${sw.device} 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} "${fs.device}"
fi
'';
unitConfig.RequiresMountsFor = [ "${dirOf fs.device}" ];
unitConfig.DefaultDependencies = false; # needed to prevent a cycle
serviceConfig.Type = "oneshot";
};
in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems));
};
}