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5ee79c5722
It specifies what mingetty will be stopped, if a bad filesystem triggers an emergency shell. That should be ttyS0 on headless systems, and in that case, nixos should stop the ttyS0 mingetty from getting in.
325 lines
9.6 KiB
Nix
325 lines
9.6 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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boot.ttyEmergency = mkOption {
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default =
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if pkgs.stdenv.isArm
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then "ttyS0" # presumably an embedded platform such as a plug
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else "tty1";
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description = ''
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The tty that will be stopped in case an emergency shell is spawned
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at 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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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 '${fs.mountPoint}'
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'')}
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# Create missing swapfiles.
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# FIXME: support changing the size of existing swapfiles.
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${flip concatMapStrings config.swapDevices (sw: optionalString (sw.size != null) ''
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if [ ! -e "${sw.device}" -a -e "$(dirname "${sw.device}")" ]; then
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# FIXME: use ‘fallocate’ on filesystems that support it.
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dd if=/dev/zero of="${sw.device}" bs=1M count=${toString sw.size}
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mkswap ${sw.device}
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fi
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'')}
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'';
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daemonType = "daemon";
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exec = "mountall --daemon";
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};
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# The `mount-failed' event is emitted synchronously, but we don't
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# want `mountall' to wait for the emergency shell. So use this
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# intermediate job to make the event asynchronous.
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jobs."mount-failed" =
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{ task = true;
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startOn = "mount-failed";
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restartIfChanged = false;
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script =
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''
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# Don't start the emergency shell if the X server is
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# running. The user won't see it, and the "console owner"
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# stanza breaks VT switching and causes the X server to go
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# to 100% CPU time.
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status="$(status xserver || true)"
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[[ "$status" =~ start/ ]] && exit 0
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stop ${config.boot.ttyEmergency} || true
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start --no-wait emergency-shell \
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DEVICE="$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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