304 lines
8.8 KiB
Nix
304 lines
8.8 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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fstab = pkgs.writeText "fstab"
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''
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# This is a generated file. Do not edit!
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# Filesystems.
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${flip concatMapStrings config.fileSystems (fs:
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(if fs.device != null then fs.device else "/dev/disk/by-label/${fs.label}")
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+ " " + fs.mountPoint
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+ " " + fs.fsType
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+ " " + fs.options
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+ " 0"
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+ " " + (if fs.fsType == "none" || fs.fsType == "btrfs" || fs.noCheck then "0" else
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if fs.mountPoint == "/" then "1" else "2")
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+ "\n"
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)}
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# Swap devices.
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${flip concatMapStrings config.swapDevices (sw:
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"${sw.device} none swap\n"
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)}
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'';
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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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example = [
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{ mountPoint = "/";
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device = "/dev/hda1";
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}
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{ mountPoint = "/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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{ mountPoint = "/bigdisk";
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label = "bigdisk";
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}
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];
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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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<literal>autocreate</literal> forces <literal>mountPoint</literal> to be created with
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<command>mkdir -p</command> .
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'';
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type = types.list types.optionSet;
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options = {
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mountPoint = mkOption {
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example = "/mnt/usb";
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type = types.uniq types.string;
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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.uniq (types.nullOr types.string);
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description = "Location of the device.";
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};
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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.uniq (types.nullOr types.string);
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description = "Label of the device (if any).";
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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 = types.uniq types.string;
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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,relatime";
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example = "data=journal";
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type = types.string;
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merge = pkgs.lib.concatStringsSep ",";
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description = "Options used to mount the file system.";
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};
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autocreate = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Automatically create the mount point defined in
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<option>fileSystems.*.mountPoint</option>.
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'';
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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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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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};
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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.list types.string;
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description = "Names of supported filesystem types.";
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};
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boot.initrd.supportedFilesystems = mkOption {
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default = [ ];
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example = [ "btrfs" ];
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type = types.list types.string;
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description = "Names of supported filesystem types in the initial ramdisk.";
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};
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};
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###### implementation
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config = {
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boot.supportedFilesystems =
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map (fs: fs.fsType) config.fileSystems;
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boot.initrd.supportedFilesystems =
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map (fs: fs.fsType)
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(filter (fs: fs.mountPoint == "/" || fs.neededForBoot) config.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 =
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[ pkgs.ntfs3g pkgs.cifs_utils pkgs.mountall ]
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++ config.system.fsPackages;
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environment.etc = singleton
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{ source = fstab;
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target = "fstab";
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};
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jobs.mountall =
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{ startOn = "started udev or config-changed";
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task = true;
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path = [ pkgs.utillinux pkgs.mountall ] ++ config.system.fsPackages;
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console = "output";
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preStart =
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''
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# Ensure that this job is restarted when fstab changed:
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# ${fstab}
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echo "mounting filesystems..."
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# Format devices.
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${flip concatMapStrings config.fileSystems (fs: optionalString fs.autoFormat ''
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if [ -e "${fs.device}" ]; then
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type=$(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} "${fs.device}"
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fi
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fi
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'')}
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# Create missing mount points. Note that this won't work
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# if the mount point is under another mount point.
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${flip concatMapStrings config.fileSystems (fs: optionalString fs.autocreate ''
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mkdir -p -m 0755 '${fs.mountPoint}'
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'')}
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'';
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daemonType = "daemon";
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exec = "mountall --daemon";
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};
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# The `mount-failed' event is emitted synchronously, but we don't
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# want `mountall' to wait for the emergency shell. So use this
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# intermediate job to make the event asynchronous.
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jobs."mount-failed" =
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{ task = true;
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startOn = "mount-failed";
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restartIfChanged = false;
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script =
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''
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# Don't start the emergency shell if the X server is
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# running. The user won't see it, and the "console owner"
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# stanza breaks VT switching and causes the X server to go
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# to 100% CPU time.
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status="$(status xserver || true)"
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[[ "$status" =~ start/ ]] && exit 0
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stop tty1 || true
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start --no-wait emergency-shell \
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DEVICE="$DEVICE" MOUNTPOINT="$MOUNTPOINT"
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'';
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};
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# On an `ip-up' event, notify mountall so that it retries mounting
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# remote filesystems.
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jobs."mountall-ip-up" =
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{
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task = true;
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startOn = "ip-up";
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restartIfChanged = false;
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script =
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''
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# Send USR1 to the mountall process. Can't use "pkill
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# mountall" here because that has a race condition: we may
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# accidentally send USR1 to children of mountall (such as
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# fsck) just before they do execve().
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status="$(status mountall)"
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if [[ "$status" =~ "start/running, process "([0-9]+) ]]; then
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pid=''${BASH_REMATCH[1]}
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echo "sending USR1 to $pid..."
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kill -USR1 "$pid"
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fi
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'';
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};
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jobs."emergency-shell" =
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{ task = true;
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restartIfChanged = false;
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console = "owner";
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script =
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''
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cat <<EOF
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[1;31m<<< Emergency shell >>>[0m
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The filesystem \`$DEVICE' could not be mounted on \`$MOUNTPOINT'.
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Please do one of the following:
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- Repair the filesystem (\`fsck $DEVICE') and exit the emergency
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shell to resume booting.
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- Ignore any failed filesystems and continue booting by running
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\`initctl emit filesystem'.
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- Remove the failed filesystem from the system configuration in
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/etc/nixos/configuration.nix and run \`nixos-rebuild switch'.
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EOF
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${pkgs.shadow}/bin/login root || false
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initctl start --no-wait mountall
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'';
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};
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};
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}
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