192 lines
6.5 KiB
Nix
192 lines
6.5 KiB
Nix
# This Nix expression builds the initial ramdisk, which contains an
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# init script that performs the first stage of booting the system: it
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# loads the modules necessary to mount the root file system, then
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# calls the init in the root file system to start the second boot
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# stage.
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{ pkgs, config, kernelPackages, modulesTree }:
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rec {
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# Determine the set of modules that we need to mount the root FS.
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modulesClosure = pkgs.makeModulesClosure {
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rootModules =
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config.boot.initrd.extraKernelModules ++
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config.boot.initrd.kernelModules;
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kernel = modulesTree;
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allowMissing = config.boot.initrd.allowMissing;
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};
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# Some additional utilities needed in stage 1, like mount, lvm, fsck
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# etc. We don't want to bring in all of those packages, so we just
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# copy what we need. Instead of using statically linked binaries,
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# we just copy what we need from Glibc and use patchelf to make it
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# work.
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extraUtils = pkgs.runCommand "extra-utils"
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{ buildInputs = [pkgs.nukeReferences];
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devicemapper = if config.boot.initrd.lvm then pkgs.devicemapper else null;
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lvm2 = if config.boot.initrd.lvm then pkgs.lvm2 else null;
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allowedReferences = ["out"]; # prevent accidents like glibc being included in the initrd
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}
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''
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ensureDir $out/bin
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ensureDir $out/lib
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# Copy what we need from Glibc.
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cp -p ${pkgs.glibc}/lib/ld-linux*.so.2 $out/lib
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cp -p ${pkgs.glibc}/lib/libc.so.* $out/lib
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cp -p ${pkgs.glibc}/lib/libpthread.so.* $out/lib
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cp -p ${pkgs.glibc}/lib/librt.so.* $out/lib
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cp -p ${pkgs.glibc}/lib/libdl.so.* $out/lib
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# Copy some utillinux stuff.
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cp ${pkgs.utillinux}/bin/mount ${pkgs.utillinux}/bin/umount ${pkgs.utillinux}/sbin/pivot_root $out/bin
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# Copy e2fsck and friends.
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cp ${pkgs.e2fsprogs}/sbin/e2fsck $out/bin
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cp ${pkgs.e2fsprogs}/sbin/tune2fs $out/bin
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cp ${pkgs.e2fsprogs}/sbin/fsck $out/bin
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ln -s e2fsck $out/bin/fsck.ext2
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ln -s e2fsck $out/bin/fsck.ext3
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ln -s e2fsck $out/bin/fsck.ext4
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cp -pd ${pkgs.e2fsprogs}/lib/lib*.so.* $out/lib
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# Copy devicemapper and lvm, if we need it.
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if test -n "$devicemapper"; then
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cp $devicemapper/sbin/dmsetup $out/bin/dmsetup
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cp $devicemapper/lib/libdevmapper.so.*.* $out/lib
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cp $lvm2/sbin/lvm $out/bin/lvm
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fi
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# Copy udev.
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cp ${pkgs.udev}/sbin/udevd ${pkgs.udev}/sbin/udevadm $out/bin
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cp ${pkgs.udev}/lib/udev/*_id $out/bin
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cp ${pkgs.udev}/lib/libvolume_id.so.* $out/lib
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# Copy bash.
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cp ${pkgs.bash}/bin/bash $out/bin
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ln -s bash $out/bin/sh
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# Run patchelf to make the programs refer to the copied libraries.
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for i in $out/bin/* $out/lib/*; do if ! test -L $i; then nuke-refs $i; fi; done
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for i in $out/bin/*; do
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if ! test -L $i; then
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echo "patching $i..."
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patchelf --set-interpreter $out/lib/ld-linux*.so.2 --set-rpath $out/lib $i || true
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fi
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done
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# Make sure that the patchelf'ed binaries still work.
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echo "testing patched programs..."
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$out/bin/bash --version
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export LD_LIBRARY_PATH=$out/lib
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$out/bin/mount --version
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$out/bin/umount --version
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$out/bin/e2fsck -V
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$out/bin/tune2fs 2> /dev/null | grep "tune2fs "
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$out/bin/fsck -N
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$out/bin/udevadm --version
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$out/bin/vol_id 2>&1 | grep "no device"
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if test -n "$devicemapper"; then
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$out/bin/dmsetup --version | grep "version:"
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LVM_SYSTEM_DIR=$out $out/bin/lvm 2>&1 | grep "LVM"
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fi
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''; # */
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# The initrd only has to mount / or any FS marked as necessary for
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# booting (such as the FS containing /nix/store, or an FS needed for
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# mounting /, like / on a loopback).
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fileSystems = pkgs.lib.filter
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(fs: fs.mountPoint == "/" || (fs ? neededForBoot && fs.neededForBoot))
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config.fileSystems;
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udevRules = pkgs.stdenv.mkDerivation {
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name = "udev-rules";
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buildCommand = ''
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ensureDir $out
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cp ${pkgs.udev}/*/udev/rules.d/60-persistent-storage.rules $out/
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substituteInPlace $out/60-persistent-storage.rules \
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--replace ata_id ${extraUtils}/bin/ata_id \
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--replace usb_id ${extraUtils}/bin/usb_id \
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--replace scsi_id ${extraUtils}/bin/scsi_id \
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--replace path_id ${extraUtils}/bin/path_id \
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--replace vol_id ${extraUtils}/bin/vol_id
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''; # */
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};
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# The udev configuration file for in the initrd.
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udevConf = pkgs.writeText "udev-initrd.conf" ''
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udev_rules="${udevRules}"
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#udev_log="debug"
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'';
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# The init script of boot stage 1 (loading kernel modules for
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# mounting the root FS).
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bootStage1 = pkgs.substituteAll {
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src = ./boot-stage-1-init.sh;
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shell = "${extraUtils}/bin/bash";
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isExecutable = true;
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inherit modulesClosure udevConf extraUtils;
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inherit (config.boot) isLiveCD resumeDevice;
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# !!! copy&pasted from upstart-jobs/filesystems.nix.
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mountPoints =
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if fileSystems == []
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then abort "You must specify the fileSystems option!"
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else map (fs: fs.mountPoint) fileSystems;
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devices = map (fs: if fs ? device then fs.device else "/dev/disk/by-label/${fs.label}") fileSystems;
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fsTypes = map (fs: if fs ? fsType then fs.fsType else "auto") fileSystems;
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optionss = map (fs: if fs ? options then fs.options else "defaults") fileSystems;
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path = [
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# `extraUtils' comes first because it overrides the `mount'
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# command provided by klibc (which isn't capable of
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# auto-detecting FS types).
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extraUtils
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pkgs.klibcShrunk
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];
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};
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# The closure of the init script of boot stage 1 is what we put in
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# the initial RAM disk.
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initialRamdisk = pkgs.makeInitrd {
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contents = [
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{ object = bootStage1;
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symlink = "/init";
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}
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] ++
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pkgs.lib.optionals
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(config.boot.initrd.enableSplashScreen && kernelPackages.splashutils != null)
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[
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{ object = pkgs.runCommand "splashutils" {allowedReferences = []; buildInputs = [pkgs.nukeReferences];} ''
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ensureDir $out/bin
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cp ${kernelPackages.splashutils}/${kernelPackages.splashutils.helperName} $out/bin/splash_helper
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nuke-refs $out/bin/*
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'';
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suffix = "/bin/splash_helper";
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symlink = "/${kernelPackages.splashutils.helperName}";
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} # */
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{ object = import ../helpers/unpack-theme.nix {
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inherit (pkgs) stdenv;
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theme = config.services.ttyBackgrounds.defaultTheme;
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};
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symlink = "/etc/splash";
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}
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];
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};
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}
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