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|
# This module builds the initial ramdisk, which contains an init
# script that performs the first stage of booting the system: it loads
# the modules necessary to mount the root file system, then calls the
# init in the root file system to start the second boot stage.
{ config, pkgs, ... }:
with pkgs.lib;
let
options = {
boot.resumeDevice = mkOption {
default = "";
example = "0:0";
description = "
Device for manual resume attempt during boot. Looks like
major:minor. ls -l /dev/SWAP_PARTION shows them.
";
};
boot.initrd.enableSplashScreen = mkOption {
default = true;
description = "
Whether to show a nice splash screen while booting.
";
};
boot.initrd.checkJournalingFS = mkOption {
default = true;
type = types.bool;
description = ''
Whether to run fsck on journaling filesystems such as ext3.
'';
};
boot.initrd.preLVMCommands = mkOption {
default = "";
type = with types; string;
description = ''
Shell commands to be executed immediately before lvm discovery.
'';
};
boot.initrd.postDeviceCommands = mkOption {
default = "";
type = with types; string;
description = ''
Shell commands to be executed immediately after stage 1 of the
boot has loaded kernel modules and created device nodes in
/dev.
'';
};
boot.initrd.postMountCommands = mkOption {
default = "";
type = with types; string;
description = ''
Shell commands to be executed immediately after the stage 1
filesystems have been mounted.
'';
};
boot.initrd.extraUtilsCommands = mkOption {
internal = true;
default = "";
type = with types; string;
description = ''
Shell commands to be executed in the builder of the
extra-utils derivation. This can be used to provide
additional utilities in the initial ramdisk.
'';
};
boot.initrd.extraUtilsCommandsTest = mkOption {
internal = true;
default = "";
type = with types; string;
description = ''
Shell commands to be executed in the builder of the
extra-utils derivation after patchelf has done its
job. This can be used to test additional utilities
copied in extraUtilsCommands.
'';
};
fileSystems = mkOption {
options.neededForBoot = mkOption {
default = false;
type = types.bool;
description = "
Mount this file system to boot on NixOS.
";
};
};
};
kernelPackages = config.boot.kernelPackages;
modulesTree = config.system.modulesTree;
# Determine the set of modules that we need to mount the root FS.
modulesClosure = pkgs.makeModulesClosure {
rootModules = config.boot.initrd.availableKernelModules ++ config.boot.initrd.kernelModules;
kernel = modulesTree;
allowMissing = true;
};
enableSplashScreen =
config.boot.vesa && config.boot.initrd.enableSplashScreen && kernelPackages.splashutils != null;
# Some additional utilities needed in stage 1, like mount, lvm, fsck
# etc. We don't want to bring in all of those packages, so we just
# copy what we need. Instead of using statically linked binaries,
# we just copy what we need from Glibc and use patchelf to make it
# work.
extraUtils = pkgs.runCommand "extra-utils"
{ buildInputs = [pkgs.nukeReferences];
allowedReferences = [ "out" modulesClosure ]; # prevent accidents like glibc being included in the initrd
doublePatchelf = (pkgs.stdenv.system == "armv5tel-linux");
}
''
ensureDir $out/bin
ensureDir $out/lib
# Copy what we need from Glibc.
cp -pv ${pkgs.glibc}/lib/ld*.so.? $out/lib
cp -pv ${pkgs.glibc}/lib/libc.so.* $out/lib
cp -pv ${pkgs.glibc}/lib/libpthread.so.* $out/lib
cp -pv ${pkgs.glibc}/lib/librt.so.* $out/lib
cp -pv ${pkgs.glibc}/lib/libdl.so.* $out/lib
cp -pv ${pkgs.gcc.gcc}/lib*/libgcc_s.so.* $out/lib
# Copy some utillinux stuff.
cp -v ${pkgs.utillinux}/bin/mount ${pkgs.utillinux}/bin/umount \
${pkgs.utillinux}/sbin/fsck ${pkgs.utillinux}/sbin/switch_root \
${pkgs.utillinux}/sbin/blkid ${pkgs.utillinux}/bin/setsid $out/bin
cp -pdv ${pkgs.utillinux}/lib/libblkid*.so.* $out/lib
cp -pdv ${pkgs.utillinux}/lib/libuuid*.so.* $out/lib
# Copy some coreutils.
cp -v ${pkgs.coreutils}/bin/basename $out/bin
cp -v ${pkgs.coreutils}/bin/mkdir $out/bin
cp -v ${pkgs.coreutils}/bin/mknod $out/bin
cp -v ${pkgs.coreutils}/bin/chmod $out/bin
cp -v ${pkgs.coreutils}/bin/cat $out/bin
cp -v ${pkgs.coreutils}/bin/chroot $out/bin
cp -v ${pkgs.coreutils}/bin/sleep $out/bin
cp -v ${pkgs.coreutils}/bin/ln $out/bin
# Copy dmsetup and lvm.
cp -v ${pkgs.lvm2}/sbin/dmsetup $out/bin/dmsetup
cp -v ${pkgs.lvm2}/sbin/lvm $out/bin/lvm
cp -v ${pkgs.lvm2}/lib/libdevmapper.so.*.* $out/lib
# Add RAID mdadm tool.
cp -v ${pkgs.mdadm}/sbin/mdadm $out/bin/mdadm
# Copy udev.
cp -v ${pkgs.udev}/sbin/udevd ${pkgs.udev}/sbin/udevadm $out/bin
cp -v ${pkgs.udev}/lib/udev/*_id $out/bin
cp -pdv ${pkgs.udev}/lib/libudev.so.* $out/lib
# Copy bash.
cp -v ${pkgs.bash}/bin/bash $out/bin
ln -sv bash $out/bin/sh
# Copy modprobe.
cp -v ${pkgs.module_init_tools}/sbin/modprobe $out/bin/modprobe.real
# Maybe copy splashutils.
${optionalString enableSplashScreen ''
cp ${kernelPackages.splashutils}/${kernelPackages.splashutils.helperName} $out/bin/splash_helper
''}
${config.boot.initrd.extraUtilsCommands}
# Run patchelf to make the programs refer to the copied libraries.
for i in $out/bin/* $out/lib/*; do if ! test -L $i; then nuke-refs $i; fi; done
for i in $out/bin/*; do
if ! test -L $i; then
echo "patching $i..."
patchelf --set-interpreter $out/lib/ld*.so.? --set-rpath $out/lib $i || true
if [ -n "$doublePatchelf" ]; then
patchelf --set-interpreter $out/lib/ld*.so.? --set-rpath $out/lib $i || true
fi
fi
done
# Make the modprobe wrapper that sets $MODULE_DIR.
cat > $out/bin/modprobe <<EOF
#! $out/bin/bash
export MODULE_DIR=${modulesClosure}/lib/modules
exec $out/bin/modprobe.real "\$@"
EOF
chmod u+x $out/bin/modprobe
# Make sure that the patchelf'ed binaries still work.
echo "testing patched programs..."
$out/bin/bash --version | grep "bash, version"
export LD_LIBRARY_PATH=$out/lib
$out/bin/mount --version | grep "mount from"
$out/bin/umount --version | grep "umount "
$out/bin/udevadm --version
$out/bin/blkid -v 2>&1 | tee -a $out/log | grep "blkid from util-linux"
$out/bin/dmsetup --version 2>&1 | tee -a $out/log | grep "version:"
LVM_SYSTEM_DIR=$out $out/bin/lvm version 2>&1 | tee -a $out/log | grep "LVM"
$out/bin/mdadm --version
$out/bin/basename --version
$out/bin/modprobe --version
${config.boot.initrd.extraUtilsCommandsTest}
''; # */
# The initrd only has to mount / or any FS marked as necessary for
# booting (such as the FS containing /nix/store, or an FS needed for
# mounting /, like / on a loopback).
fileSystems = filter
(fs: fs.mountPoint == "/" || fs.neededForBoot)
config.fileSystems;
udevRules = pkgs.stdenv.mkDerivation {
name = "udev-rules";
buildCommand = ''
ensureDir $out
echo 'ENV{LD_LIBRARY_PATH}="${extraUtils}/lib"' > $out/00-env.rules
cp -v ${pkgs.udev}/lib/udev/rules.d/60-cdrom_id.rules $out/
cp -v ${pkgs.udev}/lib/udev/rules.d/60-persistent-storage.rules $out/
cp -v ${pkgs.udev}/lib/udev/rules.d/80-drivers.rules $out/
cp -v ${pkgs.lvm2}/lib/udev/rules.d/*.rules $out/
cp -v ${pkgs.mdadm}/lib/udev/rules.d/*.rules $out/
for i in $out/*.rules; do
substituteInPlace $i \
--replace ata_id ${extraUtils}/bin/ata_id \
--replace usb_id ${extraUtils}/bin/usb_id \
--replace scsi_id ${extraUtils}/bin/scsi_id \
--replace path_id ${extraUtils}/bin/path_id \
--replace vol_id ${extraUtils}/bin/vol_id \
--replace cdrom_id ${extraUtils}/bin/cdrom_id \
--replace /sbin/blkid ${extraUtils}/bin/blkid \
--replace /sbin/modprobe ${extraUtils}/bin/modprobe \
--replace '$env{DM_SBIN_PATH}/blkid' ${extraUtils}/bin/blkid \
--replace 'ENV{DM_SBIN_PATH}="${pkgs.lvm2}/sbin"' 'ENV{DM_SBIN_PATH}="${extraUtils}/bin"' \
--replace /sbin/mdadm ${extraUtils}/bin/mdadm
done
# !!! Remove this after merging the x-updates branch:
# Work around a bug in QEMU, which doesn't implement the "READ
# DISC INFORMATION" SCSI command:
# https://bugzilla.redhat.com/show_bug.cgi?id=609049
# As a result, `cdrom_id' doesn't print
# ID_CDROM_MEDIA_TRACK_COUNT_DATA, which in turn prevents the
# /dev/disk/by-label symlinks from being created. We need these
# in the NixOS installation CD, so use ID_CDROM_MEDIA in the
# corresponding udev rules for now. This was the behaviour in
# udev <= 154. See also
# http://www.spinics.net/lists/hotplug/msg03935.html
substituteInPlace $out/60-persistent-storage.rules \
--replace ID_CDROM_MEDIA_TRACK_COUNT_DATA ID_CDROM_MEDIA
''; # */
};
# The udev configuration file for in the initrd.
udevConf = pkgs.writeText "udev-initrd.conf" ''
udev_rules="${udevRules}"
#udev_log="debug"
'';
# The init script of boot stage 1 (loading kernel modules for
# mounting the root FS).
bootStage1 = pkgs.substituteAll {
src = ./stage-1-init.sh;
shell = "${extraUtils}/bin/bash";
isExecutable = true;
inherit udevConf extraUtils;
inherit (config.boot) resumeDevice devSize runSize;
inherit (config.boot.initrd) checkJournalingFS
preLVMCommands postDeviceCommands postMountCommands kernelModules;
# !!! copy&pasted from upstart-jobs/filesystems.nix.
mountPoints =
if fileSystems == null
then abort "You must specify the fileSystems option!"
else map (fs: fs.mountPoint) fileSystems;
devices = map (fs: if fs.device != null then fs.device else "/dev/disk/by-label/${fs.label}") fileSystems;
fsTypes = map (fs: fs.fsType) fileSystems;
optionss = map (fs: fs.options) fileSystems;
};
# The closure of the init script of boot stage 1 is what we put in
# the initial RAM disk.
initialRamdisk = pkgs.makeInitrd {
contents =
[ { object = bootStage1;
symlink = "/init";
}
] ++ optionals enableSplashScreen
[ { object = extraUtils;
suffix = "/bin/splash_helper";
symlink = "/${kernelPackages.splashutils.helperName}";
}
{ object = import ../../../lib/unpack-theme.nix {
inherit (pkgs) stdenv;
theme = config.services.ttyBackgrounds.defaultTheme;
};
symlink = "/etc/splash";
}
];
};
in {
require = [options];
system.build.bootStage1 = bootStage1;
system.build.initialRamdisk = initialRamdisk;
system.build.extraUtils = extraUtils;
}
|