diff options
Diffstat (limited to 'nixos/modules/tasks/filesystems.nix')
| -rw-r--r-- | nixos/modules/tasks/filesystems.nix | 111 |
1 files changed, 85 insertions, 26 deletions
diff --git a/nixos/modules/tasks/filesystems.nix b/nixos/modules/tasks/filesystems.nix index cf8232c36154..a66ece1020f8 100644 --- a/nixos/modules/tasks/filesystems.nix +++ b/nixos/modules/tasks/filesystems.nix @@ -5,11 +5,22 @@ with utils; let - fileSystems = attrValues config.fileSystems; + fileSystems' = toposort fsBefore (attrValues config.fileSystems); + + fileSystems = if fileSystems' ? "result" + then # use topologically sorted fileSystems everywhere + fileSystems'.result + else # the assertion below will catch this, + # but we fall back to the original order + # anyway so that other modules could check + # their assertions too + (attrValues config.fileSystems); prioOption = prio: optionalString (prio != null) " pri=${toString prio}"; - fileSystemOpts = { name, config, ... }: { + specialFSTypes = [ "proc" "sysfs" "tmpfs" "devtmpfs" "devpts" ]; + + coreFileSystemOpts = { name, config, ... }: { options = { @@ -26,13 +37,6 @@ let description = "Location of the device."; }; - label = mkOption { - default = null; - example = "root-partition"; - type = types.nullOr types.str; - description = "Label of the device (if any)."; - }; - fsType = mkOption { default = "auto"; example = "ext3"; @@ -44,12 +48,28 @@ let default = [ "defaults" ]; example = [ "data=journal" ]; description = "Options used to mount the file system."; - } // (if versionAtLeast lib.nixpkgsVersion "16.09" then { type = types.listOf types.str; - } else { - type = types.either types.commas (types.listOf types.str); - apply = x: if isList x then x else lib.strings.splitString "," (builtins.trace "warning: passing a comma-separated string for filesystem options is deprecated; use a list of strings instead. This will become a hard error in 16.09." x); - }); + }; + + }; + + config = { + mountPoint = mkDefault name; + device = mkIf (elem config.fsType specialFSTypes) (mkDefault config.fsType); + }; + + }; + + fileSystemOpts = { config, ... }: { + + options = { + + label = mkOption { + default = null; + example = "root-partition"; + type = types.nullOr types.str; + description = "Label of the device (if any)."; + }; autoFormat = mkOption { default = false; @@ -91,8 +111,6 @@ let }; config = { - mountPoint = mkDefault name; - device = mkIf (config.fsType == "tmpfs") (mkDefault config.fsType); options = mkIf config.autoResize [ "x-nixos.autoresize" ]; # -F needed to allow bare block device without partitions @@ -101,6 +119,13 @@ let }; + # Makes sequence of `specialMount device mountPoint options fsType` commands. + # `systemMount` should be defined in the sourcing script. + makeSpecialMounts = mounts: + pkgs.writeText "mounts.sh" (concatMapStringsSep "\n" (mount: '' + specialMount "${mount.device}" "${mount.mountPoint}" "${concatStringsSep "," mount.options}" "${mount.fsType}" + '') mounts); + in { @@ -122,8 +147,7 @@ in "/bigdisk".label = "bigdisk"; } ''; - type = types.loaOf types.optionSet; - options = [ fileSystemOpts ]; + type = types.loaOf (types.submodule [coreFileSystemOpts fileSystemOpts]); description = '' The file systems to be mounted. It must include an entry for the root directory (<literal>mountPoint = "/"</literal>). Each @@ -155,6 +179,15 @@ in description = "Names of supported filesystem types."; }; + boot.specialFileSystems = mkOption { + default = {}; + type = types.loaOf (types.submodule coreFileSystemOpts); + internal = true; + description = '' + Special filesystems that are mounted very early during boot. + ''; + }; + }; @@ -162,6 +195,18 @@ in config = { + assertions = let + ls = sep: concatMapStringsSep sep (x: x.mountPoint); + in [ + { assertion = ! (fileSystems' ? "cycle"); + message = "The ‘fileSystems’ option can't be topologically sorted: mountpoint dependency path ${ls " -> " fileSystems'.cycle} loops to ${ls ", " fileSystems'.loops}"; + } + ]; + + # Export for use in other modules + system.build.fileSystems = fileSystems; + system.build.earlyMountScript = makeSpecialMounts (toposort fsBefore (attrValues config.boot.specialFileSystems)).result; + boot.supportedFilesystems = map (fs: fs.fsType) fileSystems; # Add the mount helpers to the system path so that `mount' can find them. @@ -175,9 +220,12 @@ in skipCheck = fs: fs.noCheck || fs.device == "none" || builtins.elem fs.fsType fsToSkipCheck; in '' # This is a generated file. Do not edit! + # + # To make changes, edit the fileSystems and swapDevices NixOS options + # in your /etc/nixos/configuration.nix file. # Filesystems. - ${flip concatMapStrings fileSystems (fs: + ${concatMapStrings (fs: (if fs.device != null then fs.device else if fs.label != null then "/dev/disk/by-label/${fs.label}" else throw "No device specified for mount point ‘${fs.mountPoint}’.") @@ -188,7 +236,7 @@ in + " " + (if skipCheck fs then "0" else if fs.mountPoint == "/" then "1" else "2") + "\n" - )} + ) fileSystems} # Swap devices. ${flip concatMapStrings config.swapDevices (sw: @@ -208,14 +256,15 @@ in formatDevice = fs: let - mountPoint' = escapeSystemdPath fs.mountPoint; - device' = escapeSystemdPath fs.device; + mountPoint' = "${escapeSystemdPath fs.mountPoint}.mount"; + device' = escapeSystemdPath fs.device; + device'' = "${device}.device"; in nameValuePair "mkfs-${device'}" { description = "Initialisation of Filesystem ${fs.device}"; - wantedBy = [ "${mountPoint'}.mount" ]; - before = [ "${mountPoint'}.mount" "systemd-fsck@${device'}.service" ]; - requires = [ "${device'}.device" ]; - after = [ "${device'}.device" ]; + wantedBy = [ mountPoint' ]; + before = [ mountPoint' "systemd-fsck@${device'}.service" ]; + requires = [ device'' ]; + after = [ device'' ]; path = [ pkgs.utillinux ] ++ config.system.fsPackages; script = '' @@ -234,6 +283,16 @@ in in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems)); + # Sync mount options with systemd's src/core/mount-setup.c: mount_table. + boot.specialFileSystems = { + "/proc" = { fsType = "proc"; options = [ "nosuid" "noexec" "nodev" ]; }; + "/sys" = { fsType = "sysfs"; options = [ "nosuid" "noexec" "nodev" ]; }; + "/run" = { fsType = "tmpfs"; options = [ "nodev" "strictatime" "mode=755" "size=${config.boot.runSize}" ]; }; + "/dev" = { fsType = "devtmpfs"; options = [ "nosuid" "strictatime" "mode=755" "size=${config.boot.devSize}" ]; }; + "/dev/shm" = { fsType = "tmpfs"; options = [ "nosuid" "nodev" "strictatime" "mode=1777" "size=${config.boot.devShmSize}" ]; }; + "/dev/pts" = { fsType = "devpts"; options = [ "nosuid" "noexec" "mode=620" "gid=${toString config.ids.gids.tty}" ]; }; + }; + }; } |