Merge pull request #17822 from abbradar/systemd-mounts

nixos filesystems: unify special filesystems handling
This commit is contained in:
Nikolay Amiantov 2016-08-30 22:42:19 +04:00 committed by GitHub
commit 509733a343
7 changed files with 75 additions and 59 deletions

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@ -20,23 +20,6 @@ with lib;
config = mkIf config.security.hideProcessInformation {
users.groups.proc.gid = config.ids.gids.proc;
systemd.services.hidepid = {
wantedBy = [ "local-fs.target" ];
after = [ "systemd-remount-fs.service" ];
before = [ "local-fs-pre.target" "local-fs.target" "shutdown.target" ];
wants = [ "local-fs-pre.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = ''${pkgs.utillinux}/bin/mount -o remount,hidepid=2,gid=${toString config.ids.gids.proc} /proc'';
ExecStop = ''${pkgs.utillinux}/bin/mount -o remount,hidepid=0,gid=0 /proc'';
};
unitConfig = {
DefaultDependencies = false;
Conflicts = "shutdown.target";
};
};
fileSystems."/proc".options = [ "hidepid=2" "gid=${toString config.ids.gids.proc}" ];
};
}

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@ -154,9 +154,15 @@ in
system.activationScripts.tmpfs =
''
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devSize}" none /dev
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devShmSize}" none /dev/shm
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.runSize}" none /run
specialMount() {
local device="$1"
local mountPoint="$2"
local options="$3"
local fsType="$4"
${pkgs.utillinux}/bin/mount -t "$fsType" -o "remount,$options" "$device" "$mountPoint"
}
source ${config.system.build.earlyMountScript}
'';
};

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@ -59,22 +59,24 @@ echo
echo "<<< NixOS Stage 1 >>>"
echo
# Mount special file systems.
# Make several required directories.
mkdir -p /etc/udev
touch /etc/fstab # to shut up mount
touch /etc/mtab # to shut up mke2fs
ln -s /proc/mounts /etc/mtab # to shut up mke2fs
touch /etc/udev/hwdb.bin # to shut up udev
touch /etc/initrd-release
mkdir -p /proc
mount -t proc proc /proc
mkdir -p /sys
mount -t sysfs sysfs /sys
mount -t devtmpfs -o "size=@devSize@" devtmpfs /dev
mkdir -p /run
mount -t tmpfs -o "mode=0755,size=@runSize@" tmpfs /run
mkdir /dev/pts
mount -t devpts devpts /dev/pts
# Mount special file systems.
specialMount() {
local device="$1"
local mountPoint="$2"
local options="$3"
local fsType="$4"
mkdir -m 0755 -p "$mountPoint"
mount -n -t "$fsType" -o "$options" "$device" "$mountPoint"
}
source @earlyMountScript@
# Log the script output to /dev/kmsg or /run/log/stage-1-init.log.
mkdir -p /tmp

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@ -190,7 +190,9 @@ let
inherit udevRules extraUtils modulesClosure;
inherit (config.boot) resumeDevice devSize runSize;
inherit (config.boot) resumeDevice;
inherit (config.system.build) earlyMountScript;
inherit (config.boot.initrd) checkJournalingFS
preLVMCommands preDeviceCommands postDeviceCommands postMountCommands preFailCommands kernelModules;

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@ -37,12 +37,16 @@ fi
# Likewise, stage 1 mounts /proc, /dev and /sys, so if we don't have a
# stage 1, we need to do that here.
if [ ! -e /proc/1 ]; then
mkdir -m 0755 -p /proc
mount -n -t proc proc /proc
mkdir -m 0755 -p /dev
mount -t devtmpfs devtmpfs /dev
mkdir -m 0755 -p /sys
mount -t sysfs sysfs /sys
specialMount() {
local device="$1"
local mountPoint="$2"
local options="$3"
local fsType="$4"
mkdir -m 0755 -p "$mountPoint"
mount -n -t "$fsType" -o "$options" "$device" "$mountPoint"
}
source @earlyMountScript@
fi
@ -87,11 +91,6 @@ done
# More special file systems, initialise required directories.
if ! mountpoint -q /dev/shm; then
mkdir -m 0755 /dev/shm
mount -t tmpfs -o "rw,nosuid,nodev,size=@devShmSize@" tmpfs /dev/shm
fi
mkdir -m 0755 -p /dev/pts
[ -e /proc/bus/usb ] && mount -t usbfs usbfs /proc/bus/usb # UML doesn't have USB by default
mkdir -m 01777 -p /tmp
mkdir -m 0755 -p /var /var/log /var/lib /var/db
@ -112,14 +111,6 @@ rm -f /etc/{group,passwd,shadow}.lock
rm -rf /nix/var/nix/gcroots/tmp /nix/var/nix/temproots
# Create a tmpfs on /run to hold runtime state for programs such as
# udev (if stage 1 hasn't already done so).
if ! mountpoint -q /run; then
rm -rf /run
mkdir -m 0755 -p /run
mount -t tmpfs -o "mode=0755,size=@runSize@" tmpfs /run
fi
# Create a ramfs on /run/keys to hold secrets that shouldn't be
# written to disk (generally used for NixOps, harmless elsewhere).
if ! mountpoint -q /run/keys; then

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@ -20,10 +20,9 @@ let
src = ./stage-2-init.sh;
shellDebug = "${pkgs.bashInteractive}/bin/bash";
isExecutable = true;
inherit (config.boot) devShmSize runSize;
inherit (config.nix) readOnlyStore;
inherit (config.networking) useHostResolvConf;
ttyGid = config.ids.gids.tty;
inherit (config.system.build) earlyMountScript;
path =
[ pkgs.coreutils
pkgs.utillinux

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@ -18,6 +18,8 @@ let
prioOption = prio: optionalString (prio != null) " pri=${toString prio}";
specialFSTypes = [ "proc" "sysfs" "tmpfs" "devtmpfs" "devpts" ];
fileSystemOpts = { name, config, ... }: {
options = {
@ -97,11 +99,22 @@ let
description = "Disable running fsck on this filesystem.";
};
early = mkOption {
default = false;
type = types.bool;
internal = true;
description = ''
Mount this filesystem very early during boot. At the moment of
mounting no disks are exposed, so this option is primarily for
special file systems.
'';
};
};
config = {
mountPoint = mkDefault name;
device = mkIf (config.fsType == "tmpfs") (mkDefault config.fsType);
device = mkIf (elem config.fsType specialFSTypes) (mkDefault config.fsType);
options = mkIf config.autoResize [ "x-nixos.autoresize" ];
# -F needed to allow bare block device without partitions
@ -110,6 +123,13 @@ let
};
# Makes sequence of `specialMount device mountPoint options fsType` commands.
# `systemMount` should be defined in the sourcing script.
makeSpecialMounts = mounts:
pkgs.writeText "mounts.sh" (concatMapStringsSep "\n" (mount: ''
specialMount "${mount.device}" "${mount.mountPoint}" "${concatStringsSep "," mount.options}" "${mount.fsType}"
'') mounts);
in
{
@ -131,8 +151,7 @@ in
"/bigdisk".label = "bigdisk";
}
'';
type = types.loaOf types.optionSet;
options = [ fileSystemOpts ];
type = types.loaOf (types.submodule fileSystemOpts);
description = ''
The file systems to be mounted. It must include an entry for
the root directory (<literal>mountPoint = "/"</literal>). Each
@ -177,10 +196,14 @@ in
{ assertion = ! (fileSystems' ? "cycle");
message = "The fileSystems option can't be topologically sorted: mountpoint dependency path ${ls " -> " fileSystems'.cycle} loops to ${ls ", " fileSystems'.loops}";
}
{ assertion = all (x: !x.early || (x.label == null && !x.autoFormat && !x.autoResize)) fileSystems;
message = "Early filesystems don't support mounting by label, auto formatting and resizing";
}
];
# Export for use in other modules
system.build.fileSystems = fileSystems;
system.build.earlyMountScript = makeSpecialMounts (filter (fs: fs.early) fileSystems);
boot.supportedFilesystems = map (fs: fs.fsType) fileSystems;
@ -211,7 +234,7 @@ in
+ " " + (if skipCheck fs then "0" else
if fs.mountPoint == "/" then "1" else "2")
+ "\n"
) fileSystems}
) (filter (fs: !fs.early) fileSystems)}
# Swap devices.
${flip concatMapStrings config.swapDevices (sw:
@ -258,6 +281,16 @@ in
in listToAttrs (map formatDevice (filter (fs: fs.autoFormat) fileSystems));
# Sync mount options with systemd's src/core/mount-setup.c: mount_table.
fileSystems = mapAttrs (n: fs: fs // { early = true; }) {
"/proc" = { fsType = "proc"; options = [ "nosuid" "noexec" "nodev" ]; };
"/sys" = { fsType = "sysfs"; options = [ "nosuid" "noexec" "nodev" ]; };
"/run" = { fsType = "tmpfs"; options = [ "nosuid" "nodev" "strictatime" "mode=755" "size=${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}" ]; };
};
};
}