616 lines
20 KiB
Nix
616 lines
20 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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kernel-name = config.boot.kernelPackages.kernel.name or "kernel";
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modulesTree = config.system.modulesTree.override { name = kernel-name + "-modules"; };
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firmware = config.hardware.firmware;
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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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firmware = firmware;
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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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# A utility for enumerating the shared-library dependencies of a program
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findLibs = pkgs.buildPackages.writeShellScriptBin "find-libs" ''
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set -euo pipefail
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declare -A seen
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declare -a left
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patchelf="${pkgs.buildPackages.patchelf}/bin/patchelf"
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function add_needed {
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rpath="$($patchelf --print-rpath $1)"
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dir="$(dirname $1)"
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for lib in $($patchelf --print-needed $1); do
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left+=("$lib" "$rpath" "$dir")
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done
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}
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add_needed $1
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while [ ''${#left[@]} -ne 0 ]; do
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next=''${left[0]}
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rpath=''${left[1]}
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ORIGIN=''${left[2]}
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left=("''${left[@]:3}")
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if [ -z ''${seen[$next]+x} ]; then
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seen[$next]=1
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# Ignore the dynamic linker which for some reason appears as a DT_NEEDED of glibc but isn't in glibc's RPATH.
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case "$next" in
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ld*.so.?) continue;;
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esac
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IFS=: read -ra paths <<< $rpath
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res=
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for path in "''${paths[@]}"; do
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path=$(eval "echo $path")
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if [ -f "$path/$next" ]; then
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res="$path/$next"
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echo "$res"
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add_needed "$res"
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break
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fi
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done
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if [ -z "$res" ]; then
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echo "Couldn't satisfy dependency $next" >&2
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exit 1
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fi
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fi
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done
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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.runCommandCC "extra-utils"
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{ nativeBuildInputs = [pkgs.buildPackages.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}/lib/systemd/systemd-sysctl
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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 $out/bin/modprobe
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# Copy resize2fs if any ext* filesystems are to be resized
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${optionalString (any (fs: fs.autoResize && (lib.hasPrefix "ext" fs.fsType)) fileSystems) ''
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# We need mke2fs in the initrd.
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copy_bin_and_libs ${pkgs.e2fsprogs}/sbin/resize2fs
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''}
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# Copy secrets if needed.
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#
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# TODO: move out to a separate script; see #85000.
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${optionalString (!config.boot.loader.supportsInitrdSecrets)
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(concatStringsSep "\n" (mapAttrsToList (dest: source:
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let source' = if source == null then dest else source; in
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''
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mkdir -p $(dirname "$out/secrets/${dest}")
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# Some programs (e.g. ssh) doesn't like secrets to be
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# symlinks, so we use `cp -L` here to match the
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# behaviour when secrets are natively supported.
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cp -Lr ${source'} "$out/secrets/${dest}"
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''
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) config.boot.initrd.secrets))
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}
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${config.boot.initrd.extraUtilsCommands}
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# Copy ld manually since it isn't detected correctly
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cp -pv ${pkgs.stdenv.cc.libc.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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for LIB in $(${findLibs}/bin/find-libs $BIN); do
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TGT="$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 $out
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stripDirs "$STRIP" "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 $i || true
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fi
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done
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if [ -z "${toString (pkgs.stdenv.hostPlatform != pkgs.stdenv.buildPlatform)}" ]; then
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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 -V 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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fi
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''; # */
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linkUnits = pkgs.runCommand "link-units" {
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allowedReferences = [ extraUtils ];
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preferLocalBuild = true;
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} ''
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mkdir -p $out
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cp -v ${udev}/lib/systemd/network/*.link $out/
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'';
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udevRules = pkgs.runCommand "udev-rules" {
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allowedReferences = [ extraUtils ];
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preferLocalBuild = true;
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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/75-net-description.rules $out/
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cp -v ${udev}/lib/udev/rules.d/80-drivers.rules $out/
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cp -v ${udev}/lib/udev/rules.d/80-net-setup-link.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.coreutils}/bin/basename ${extraUtils}/bin/basename \
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--replace ${pkgs.utillinux}/bin/blkid ${extraUtils}/bin/blkid \
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--replace ${pkgs.lvm2}/sbin ${extraUtils}/bin \
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--replace ${pkgs.mdadm}/sbin ${extraUtils}/sbin \
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--replace ${pkgs.bash}/bin/sh ${extraUtils}/bin/sh \
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--replace ${udev} ${extraUtils}
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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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postInstall = ''
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echo checking syntax
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# check both with bash
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${pkgs.buildPackages.bash}/bin/sh -n $target
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# and with ash shell, just in case
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${pkgs.buildPackages.busybox}/bin/ash -n $target
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'';
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inherit linkUnits udevRules extraUtils modulesClosure;
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inherit (config.boot) resumeDevice;
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inherit (config.system.build) earlyMountScript;
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inherit (config.boot.initrd) checkJournalingFS
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preLVMCommands preDeviceCommands postDeviceCommands postMountCommands preFailCommands kernelModules;
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resumeDevices = map (sd: if sd ? device then sd.device else "/dev/disk/by-label/${sd.label}")
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(filter (sd: hasPrefix "/dev/" sd.device && !sd.randomEncryption.enable
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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''${hi:0:2}" > /etc/hostid
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''}
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'';
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};
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# The closure of the init script of boot stage 1 is what we put in
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# the initial RAM disk.
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initialRamdisk = pkgs.makeInitrd {
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name = "initrd-${kernel-name}";
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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 = "${pkgs.kmod-blacklist-ubuntu}/modprobe.conf";
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preferLocalBuild = true;
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} ''
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target=$out
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${pkgs.buildPackages.perl}/bin/perl -0pe 's/## file: iwlwifi.conf(.+?)##/##/s;' $src > $out
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'';
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symlink = "/etc/modprobe.d/ubuntu.conf";
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}
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{ object = pkgs.kmod-debian-aliases;
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symlink = "/etc/modprobe.d/debian.conf";
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}
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];
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};
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# Script to add secret files to the initrd at bootloader update time
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initialRamdiskSecretAppender =
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pkgs.writeScriptBin "append-initrd-secrets"
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''
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#!${pkgs.bash}/bin/bash -e
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function usage {
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echo "USAGE: $0 INITRD_FILE" >&2
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echo "Appends this configuration's secrets to INITRD_FILE" >&2
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}
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if [ $# -ne 1 ]; then
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usage
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exit 1
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fi
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if [ "$1"x = "--helpx" ]; then
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usage
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exit 0
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fi
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${lib.optionalString (config.boot.initrd.secrets == {})
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"exit 0"}
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export PATH=${pkgs.coreutils}/bin:${pkgs.cpio}/bin:${pkgs.gzip}/bin:${pkgs.findutils}/bin
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function cleanup {
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if [ -n "$tmp" -a -d "$tmp" ]; then
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rm -fR "$tmp"
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fi
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}
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trap cleanup EXIT
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tmp=$(mktemp -d initrd-secrets.XXXXXXXXXX)
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${lib.concatStringsSep "\n" (mapAttrsToList (dest: source:
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let source' = if source == null then dest else toString source; in
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''
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mkdir -p $(dirname "$tmp/${dest}")
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cp -a ${source'} "$tmp/${dest}"
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''
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) config.boot.initrd.secrets)
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}
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(cd "$tmp" && find . | cpio -H newc -o) | gzip >>"$1"
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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.enable = mkOption {
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type = types.bool;
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default = !config.boot.isContainer;
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defaultText = "!config.boot.isContainer";
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description = ''
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Whether to enable the NixOS initial RAM disk (initrd). This may be
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needed to perform some initialisation tasks (like mounting
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network/encrypted file systems) before continuing the boot process.
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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 {
|
||
internal = true;
|
||
default = "";
|
||
type = types.lines;
|
||
description = ''
|
||
Shell commands to be executed in the builder of the
|
||
udev-rules derivation. This can be used to add
|
||
additional udev rules in the initial ramdisk.
|
||
'';
|
||
};
|
||
|
||
boot.initrd.compressor = mkOption {
|
||
internal = true;
|
||
default = "gzip -9n";
|
||
type = types.str;
|
||
description = "The compressor to use on the initrd image.";
|
||
example = "xz";
|
||
};
|
||
|
||
boot.initrd.secrets = mkOption
|
||
{ default = {};
|
||
type = types.attrsOf (types.nullOr types.path);
|
||
description =
|
||
''
|
||
Secrets to append to the initrd. The attribute name is the
|
||
path the secret should have inside the initrd, the value
|
||
is the path it should be copied from (or null for the same
|
||
path inside and out).
|
||
'';
|
||
example = literalExample
|
||
''
|
||
{ "/etc/dropbear/dropbear_rsa_host_key" =
|
||
./secret-dropbear-key;
|
||
}
|
||
'';
|
||
};
|
||
|
||
boot.initrd.supportedFilesystems = mkOption {
|
||
default = [ ];
|
||
example = [ "btrfs" ];
|
||
type = types.listOf types.str;
|
||
description = "Names of supported filesystem types in the initial ramdisk.";
|
||
};
|
||
|
||
boot.loader.supportsInitrdSecrets = mkOption
|
||
{ internal = true;
|
||
default = false;
|
||
type = types.bool;
|
||
description =
|
||
''
|
||
Whether the bootloader setup runs append-initrd-secrets.
|
||
If not, any needed secrets must be copied into the initrd
|
||
and thus added to the store.
|
||
'';
|
||
};
|
||
|
||
fileSystems = mkOption {
|
||
type = with lib.types; loaOf (submodule {
|
||
options.neededForBoot = mkOption {
|
||
default = false;
|
||
type = types.bool;
|
||
description = ''
|
||
If set, this file system will be mounted in the initial
|
||
ramdisk. By default, this applies to the root file system
|
||
and to the file system containing
|
||
<filename>/nix/store</filename>.
|
||
'';
|
||
};
|
||
});
|
||
};
|
||
|
||
};
|
||
|
||
config = mkIf config.boot.initrd.enable {
|
||
assertions = [
|
||
{ assertion = any (fs: fs.mountPoint == "/") fileSystems;
|
||
message = "The ‘fileSystems’ option does not specify your root file system.";
|
||
}
|
||
{ assertion = let inherit (config.boot) resumeDevice; in
|
||
resumeDevice == "" || builtins.substring 0 1 resumeDevice == "/";
|
||
message = "boot.resumeDevice has to be an absolute path."
|
||
+ " Old \"x:y\" style is no longer supported.";
|
||
}
|
||
# TODO: remove when #85000 is fixed
|
||
{ assertion = !config.boot.loader.supportsInitrdSecrets ->
|
||
all (source:
|
||
builtins.isPath source ||
|
||
(builtins.isString source && hasPrefix builtins.storeDir source))
|
||
(attrValues config.boot.initrd.secrets);
|
||
message = ''
|
||
boot.loader.initrd.secrets values must be unquoted paths when
|
||
using a bootloader that doesn't natively support initrd
|
||
secrets, e.g.:
|
||
|
||
boot.initrd.secrets = {
|
||
"/etc/secret" = /path/to/secret;
|
||
};
|
||
|
||
Note that this will result in all secrets being stored
|
||
world-readable in the Nix store!
|
||
'';
|
||
}
|
||
];
|
||
|
||
system.build =
|
||
{ inherit bootStage1 initialRamdisk initialRamdiskSecretAppender extraUtils; };
|
||
|
||
system.requiredKernelConfig = with config.lib.kernelConfig; [
|
||
(isYes "TMPFS")
|
||
(isYes "BLK_DEV_INITRD")
|
||
];
|
||
|
||
boot.initrd.supportedFilesystems = map (fs: fs.fsType) fileSystems;
|
||
|
||
};
|
||
}
|