97bfc2fac9
This ensures that most "trivial" derivations used to build NixOS configurations no longer depend on GCC. For commands that do invoke gcc, there is runCommandCC.
420 lines
14 KiB
Nix
420 lines
14 KiB
Nix
# This module builds the initial ramdisk, which contains an init
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# script that performs the first stage of booting the system: it loads
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# the modules necessary to mount the root file system, then calls the
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# init in the root file system to start the second boot stage.
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{ config, lib, utils, pkgs, ... }:
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with lib;
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let
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udev = config.systemd.package;
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kernelPackages = config.boot.kernelPackages;
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modulesTree = config.system.modulesTree;
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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 = config.boot.initrd.availableKernelModules ++ config.boot.initrd.kernelModules;
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kernel = modulesTree;
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allowMissing = true;
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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 = filter utils.fsNeededForBoot config.system.build.fileSystems;
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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.runCommandCC "extra-utils"
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{ buildInputs = [pkgs.nukeReferences];
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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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set +o pipefail
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mkdir -p $out/bin $out/lib
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ln -s $out/bin $out/sbin
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copy_bin_and_libs () {
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[ -f "$out/bin/$(basename $1)" ] && rm "$out/bin/$(basename $1)"
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cp -pdv $1 $out/bin
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}
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# Copy BusyBox.
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for BIN in ${pkgs.busybox}/{s,}bin/*; do
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copy_bin_and_libs $BIN
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done
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# Copy some utillinux stuff.
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copy_bin_and_libs ${pkgs.utillinux}/sbin/blkid
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# Copy dmsetup and lvm.
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copy_bin_and_libs ${pkgs.lvm2}/sbin/dmsetup
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copy_bin_and_libs ${pkgs.lvm2}/sbin/lvm
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# Add RAID mdadm tool.
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copy_bin_and_libs ${pkgs.mdadm}/sbin/mdadm
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copy_bin_and_libs ${pkgs.mdadm}/sbin/mdmon
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# Copy udev.
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copy_bin_and_libs ${udev}/lib/systemd/systemd-udevd
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copy_bin_and_libs ${udev}/bin/udevadm
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for BIN in ${udev}/lib/udev/*_id; do
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copy_bin_and_libs $BIN
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done
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# Copy modprobe.
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copy_bin_and_libs ${pkgs.kmod}/bin/kmod
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ln -sf kmod $out/bin/modprobe
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# Copy resize2fs if needed.
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${optionalString (any (fs: fs.autoResize) fileSystems) ''
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# We need mke2fs in the initrd.
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copy_bin_and_libs ${pkgs.e2fsprogs}/sbin/resize2fs
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''}
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${config.boot.initrd.extraUtilsCommands}
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# Copy ld manually since it isn't detected correctly
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cp -pv ${pkgs.glibc.out}/lib/ld*.so.? $out/lib
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# Copy all of the needed libraries
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find $out/bin $out/lib -type f | while read BIN; do
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echo "Copying libs for executable $BIN"
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LDD="$(ldd $BIN)" || continue
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LIBS="$(echo "$LDD" | awk '{print $3}' | sed '/^$/d')"
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for LIB in $LIBS; do
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TGT="$out/lib/$(basename $LIB)"
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if [ ! -f "$TGT" ]; then
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SRC="$(readlink -e $LIB)"
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cp -pdv "$SRC" "$TGT"
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fi
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done
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done
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# Strip binaries further than normal.
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chmod -R u+w $out
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stripDirs "lib bin" "-s"
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# Run patchelf to make the programs refer to the copied libraries.
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find $out/bin $out/lib -type f | while read i; do
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if ! test -L $i; then
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nuke-refs -e $out $i
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fi
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done
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find $out/bin -type f | while read i; 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*.so.? --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/ash -c 'echo hello world' | grep "hello world"
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export LD_LIBRARY_PATH=$out/lib
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$out/bin/mount --help 2>&1 | grep -q "BusyBox"
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$out/bin/blkid --help 2>&1 | grep -q 'libblkid'
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$out/bin/udevadm --version
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$out/bin/dmsetup --version 2>&1 | tee -a log | grep -q "version:"
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LVM_SYSTEM_DIR=$out $out/bin/lvm version 2>&1 | tee -a log | grep -q "LVM"
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$out/bin/mdadm --version
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${config.boot.initrd.extraUtilsCommandsTest}
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''; # */
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udevRules = pkgs.runCommand "udev-rules"
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{ allowedReferences = [ extraUtils ]; }
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''
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mkdir -p $out
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echo 'ENV{LD_LIBRARY_PATH}="${extraUtils}/lib"' > $out/00-env.rules
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cp -v ${udev}/lib/udev/rules.d/60-cdrom_id.rules $out/
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cp -v ${udev}/lib/udev/rules.d/60-persistent-storage.rules $out/
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cp -v ${udev}/lib/udev/rules.d/80-drivers.rules $out/
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cp -v ${pkgs.lvm2}/lib/udev/rules.d/*.rules $out/
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${config.boot.initrd.extraUdevRulesCommands}
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for i in $out/*.rules; do
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substituteInPlace $i \
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--replace ata_id ${extraUtils}/bin/ata_id \
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--replace scsi_id ${extraUtils}/bin/scsi_id \
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--replace cdrom_id ${extraUtils}/bin/cdrom_id \
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--replace ${pkgs.utillinux}/sbin/blkid ${extraUtils}/bin/blkid \
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--replace /sbin/blkid ${extraUtils}/bin/blkid \
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--replace ${pkgs.lvm2}/sbin ${extraUtils}/bin \
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--replace /sbin/mdadm ${extraUtils}/bin/mdadm \
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--replace /bin/sh ${extraUtils}/bin/sh \
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--replace /usr/bin/readlink ${extraUtils}/bin/readlink \
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--replace /usr/bin/basename ${extraUtils}/bin/basename \
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--replace ${udev}/bin/udevadm ${extraUtils}/bin/udevadm
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done
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# Work around a bug in QEMU, which doesn't implement the "READ
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# DISC INFORMATION" SCSI command:
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# https://bugzilla.redhat.com/show_bug.cgi?id=609049
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# As a result, `cdrom_id' doesn't print
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# ID_CDROM_MEDIA_TRACK_COUNT_DATA, which in turn prevents the
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# /dev/disk/by-label symlinks from being created. We need these
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# in the NixOS installation CD, so use ID_CDROM_MEDIA in the
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# corresponding udev rules for now. This was the behaviour in
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# udev <= 154. See also
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# http://www.spinics.net/lists/hotplug/msg03935.html
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substituteInPlace $out/60-persistent-storage.rules \
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--replace ID_CDROM_MEDIA_TRACK_COUNT_DATA ID_CDROM_MEDIA
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''; # */
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# The init script of boot stage 1 (loading kernel modules for
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# mounting the root FS).
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bootStage1 = pkgs.substituteAll {
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src = ./stage-1-init.sh;
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shell = "${extraUtils}/bin/ash";
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isExecutable = true;
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inherit udevRules extraUtils modulesClosure;
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inherit (config.boot) resumeDevice;
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inherit (config.system.build) earlyMountScript;
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inherit (config.boot.initrd) checkJournalingFS
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preLVMCommands preDeviceCommands postDeviceCommands postMountCommands preFailCommands kernelModules;
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resumeDevices = map (sd: if sd ? device then sd.device else "/dev/disk/by-label/${sd.label}")
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(filter (sd: hasPrefix "/dev/" sd.device && !sd.randomEncryption
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# Don't include zram devices
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&& !(hasPrefix "/dev/zram" sd.device)
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) config.swapDevices);
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fsInfo =
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let f = fs: [ fs.mountPoint (if fs.device != null then fs.device else "/dev/disk/by-label/${fs.label}") fs.fsType (builtins.concatStringsSep "," fs.options) ];
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in pkgs.writeText "initrd-fsinfo" (concatStringsSep "\n" (concatMap f fileSystems));
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setHostId = optionalString (config.networking.hostId != null) ''
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hi="${config.networking.hostId}"
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${if pkgs.stdenv.isBigEndian then ''
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echo -ne "\x''${hi:0:2}\x''${hi:2:2}\x''${hi:4:2}\x''${hi:6:2}" > /etc/hostid
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'' else ''
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echo -ne "\x''${hi:6:2}\x''${hi:4:2}\x''${hi:2:2}\x''${hi:0:2}" > /etc/hostid
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''}
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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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inherit (config.boot.initrd) compressor prepend;
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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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{ object = pkgs.writeText "mdadm.conf" config.boot.initrd.mdadmConf;
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symlink = "/etc/mdadm.conf";
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}
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{ object = pkgs.runCommand "initrd-kmod-blacklist-ubuntu"
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{ src = "${pkgs.kmod-blacklist-ubuntu}/modprobe.conf"; }
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''
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target=$out
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${pkgs.perl}/bin/perl -0pe 's/## file: iwlwifi.conf(.+?)##/##/s;' $src > $out
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'';
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symlink = "/etc/modprobe.d/ubuntu.conf";
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}
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{ object = pkgs.kmod-debian-aliases;
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symlink = "/etc/modprobe.d/debian.conf";
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}
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];
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};
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in
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{
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options = {
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boot.resumeDevice = mkOption {
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type = types.str;
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default = "";
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example = "/dev/sda3";
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description = ''
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Device for manual resume attempt during boot. This should be used primarily
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if you want to resume from file. If left empty, the swap partitions are used.
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Specify here the device where the file resides.
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You should also use <varname>boot.kernelParams</varname> to specify
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<literal><replaceable>resume_offset</replaceable></literal>.
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'';
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};
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boot.initrd.prepend = mkOption {
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default = [ ];
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type = types.listOf types.str;
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description = ''
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Other initrd files to prepend to the final initrd we are building.
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'';
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};
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boot.initrd.checkJournalingFS = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to run <command>fsck</command> on journaling filesystems such as ext3.
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'';
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};
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boot.initrd.mdadmConf = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Contents of <filename>/etc/mdadm.conf</filename> in stage 1.
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'';
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};
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boot.initrd.preLVMCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed immediately before LVM discovery.
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'';
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};
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boot.initrd.preDeviceCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed before udev is started to create
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device nodes.
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'';
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};
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boot.initrd.postDeviceCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed immediately after stage 1 of the
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boot has loaded kernel modules and created device nodes in
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<filename>/dev</filename>.
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'';
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};
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boot.initrd.postMountCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed immediately after the stage 1
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filesystems have been mounted.
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'';
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};
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boot.initrd.preFailCommands = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed before the failure prompt is shown.
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'';
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};
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boot.initrd.extraUtilsCommands = mkOption {
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internal = true;
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed in the builder of the
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extra-utils derivation. This can be used to provide
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additional utilities in the initial ramdisk.
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'';
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};
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boot.initrd.extraUtilsCommandsTest = mkOption {
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internal = true;
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed in the builder of the
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extra-utils derivation after patchelf has done its
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job. This can be used to test additional utilities
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copied in extraUtilsCommands.
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'';
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};
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boot.initrd.extraUdevRulesCommands = mkOption {
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internal = true;
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default = "";
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type = types.lines;
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description = ''
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Shell commands to be executed in the builder of the
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udev-rules derivation. This can be used to add
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additional udev rules in the initial ramdisk.
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'';
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};
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boot.initrd.compressor = mkOption {
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internal = true;
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default = "gzip -9n";
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type = types.str;
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description = "The compressor to use on the initrd image.";
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example = "xz";
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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.listOf types.str;
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description = "Names of supported filesystem types in the initial ramdisk.";
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};
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fileSystems = mkOption {
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options.neededForBoot = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, this file system will be mounted in the initial
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ramdisk. By default, this applies to the root file system
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and to the file system containing
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<filename>/nix/store</filename>.
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'';
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};
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};
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};
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config = mkIf (!config.boot.isContainer) {
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assertions = [
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{ assertion = any (fs: fs.mountPoint == "/") fileSystems;
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message = "The ‘fileSystems’ option does not specify your root file system.";
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}
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{ assertion = let inherit (config.boot) resumeDevice; in
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resumeDevice == "" || builtins.substring 0 1 resumeDevice == "/";
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message = "boot.resumeDevice has to be an absolute path."
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+ " Old \"x:y\" style is no longer supported.";
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}
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];
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system.build.bootStage1 = bootStage1;
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system.build.initialRamdisk = initialRamdisk;
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system.build.extraUtils = extraUtils;
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system.requiredKernelConfig = with config.lib.kernelConfig; [
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(isYes "TMPFS")
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(isYes "BLK_DEV_INITRD")
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];
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boot.initrd.supportedFilesystems = map (fs: fs.fsType) fileSystems;
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};
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}
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