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#!/bin/bash
#
# Generator script for a dracut initramfs
# Tries to retain some degree of compatibility with the command line
# of the various mkinitrd implementations out there
#
# Copyright 2005-2009 Red Hat, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# store for logging
dracut_args="$@"
usage() {
# 80x25 linebreak here ^
echo "Usage: $0 [OPTION]... <initramfs> <kernel-version>
Creates initial ramdisk images for preloading modules
-f, --force Overwrite existing initramfs file.
-m, --modules [LIST] Specify a space-separated list of dracut modules to
call when building the initramfs. Modules are located
in /usr/share/dracut/modules.d.
-o, --omit [LIST] Omit a space-separated list of dracut modules.
-a, --add [LIST] Add a space-separated list of dracut modules.
-d, --drivers [LIST] Specify a space-separated list of kernel modules to
exclusively include in the initramfs.
--add-drivers [LIST] Specify a space-separated list of kernel
modules to add to the initramfs.
--omit-drivers [LIST] Specify a space-separated list of kernel
modules not to add to the initramfs.
--filesystems [LIST] Specify a space-separated list of kernel filesystem
modules to exclusively include in the generic
initramfs.
-k, --kmoddir [DIR] Specify the directory, where to look for kernel
modules
--fwdir [DIR] Specify additional directories, where to look for
firmwares, separated by :
--kernel-only Only install kernel drivers and firmware files
--no-kernel Do not install kernel drivers and firmware files
--strip Strip binaries in the initramfs (default)
--nostrip Do not strip binaries in the initramfs
--mdadmconf Include local /etc/mdadm.conf
--nomdadmconf Do not include local /etc/mdadm.conf
--lvmconf Include local /etc/lvm/lvm.conf
--nolvmconf Do not include local /etc/lvm/lvm.conf
-h, --help This message
--debug Output debug information of the build process
-v, --verbose Verbose output during the build process
-c, --conf [FILE] Specify configuration file to use.
Default: /etc/dracut.conf
-l, --local Local mode. Use modules from the current working
directory instead of the system-wide installed in
/usr/share/dracut/modules.d.
Useful when running dracut from a git checkout.
-H, --hostonly Host-Only mode: Install only what is needed for
booting the local host instead of a generic host.
-i, --include [SOURCE] [TARGET]
Include the files in the SOURCE directory into the
Target directory in the final initramfs.
-I, --install [LIST] Install the space separated list of files into the
initramfs.
"
}
while (($# > 0)); do
case $1 in
-f|--force) force=yes;;
-m|--modules) dracutmodules_l="$2"; shift;;
-o|--omit) omit_dracutmodules_l="$2"; shift;;
-a|--add) add_dracutmodules_l="$2"; shift;;
-d|--drivers) drivers_l="$2"; shift;;
--add-drivers) add_drivers_l="$2"; shift;;
--omit-drivers) omit_drivers_l+="$2"; shift;;
--filesystems) filesystems_l="$2"; shift;;
-k|--kmoddir) drivers_dir_l="$2"; shift;;
--fwdir) fw_dir_l="$2"; shift;;
--kernel-only) kernel_only="yes"; no_kernel="no";;
--no-kernel) kernel_only="no"; no_kernel="yes";;
--strip) do_strip_l="yes";;
--nostrip) do_strip_l="no";;
--mdadmconf) mdadmconf_l="yes";;
--nomdadmconf) mdadmconf_l="no";;
--lvmconf) lvmconf_l="yes";;
--nolvmconf) lvmconf_l="no";;
-h|--help) usage; exit 1 ;;
--debug) debug="yes";;
-v|--verbose) beverbose="yes";;
-c|--conf) conffile="$2"; shift;;
--confdir) confdir="$2"; shift;;
-l|--local) allowlocal="yes" ;;
-H|--hostonly) hostonly_l="yes" ;;
-i|--include) include_src="$2"; include_target="$3"; shift 2;;
-I|--install) install_items="$2"; shift;;
-*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
*) break ;;
esac
shift
done
PATH=/sbin:/bin:/usr/sbin:/usr/bin
export PATH
unset LD_LIBRARY_PATH
unset GREP_OPTIONS
[[ $debug ]] && {
export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
set -x
}
[[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
[[ $allowlocal && -f "$(readlink -f $(dirname $0))/dracut-functions" ]] && dracutbasedir="$(dirname $0)"
# if we were not passed a config file, try the default one
if [[ ! -f $conffile ]]; then
[[ $allowlocal ]] || conffile="/etc/dracut.conf"
[[ $allowlocal ]] && conffile="$dracutbasedir/dracut.conf"
fi
if [[ ! -d $confdir ]]; then
[[ $allowlocal ]] || confdir="/etc/dracut.conf.d"
[[ $allowlocal ]] && confdir="$dracutbasedir/dracut.conf.d"
fi
# source our config dir
if [ "$confdir" ] && [ -d "$confdir" ]; then
for f in "$confdir"/*.conf; do
[ -e "$f" ] && . "$f"
done
fi
# source our config file
[[ -f $conffile ]] && . "$conffile"
# these optins add to the stuff in the config file
[[ $add_dracutmodules_l ]] && add_dracutmodules+=" $add_dracutmodules_l"
[[ $add_drivers_l ]] && add_drivers+=" $add_drivers_l"
[[ $omit_drivers_l ]] && omit_drivers+=" $omit_drivers_l"
# these options override the stuff in the config file
[[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
[[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
[[ $drivers_l ]] && drivers=$drivers_l
[[ $filesystems_l ]] && filesystems=$filesystems_l
[[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
[[ $fw_dir_l ]] && fw_dir=$fw_dir_l
[[ $do_strip_l ]] && do_strip=$do_strip_l
[[ $hostonly_l ]] && hostonly=$hostonly_l
[[ $mdadmconf_l ]] && mdadmconf=$mdadmconf_l
[[ $lvmconf_l ]] && lvmconf=$lvmconf_l
[[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
[[ $fw_dir ]] || fw_dir=/lib/firmware:/usr/lib/firmware
[[ $do_strip ]] || do_strip=yes
# eliminate IFS hackery when messing with fw_dir
fw_dir=${fw_dir//:/ }
[[ $hostonly = yes ]] && hostonly="-h"
[[ $hostonly != "-h" ]] && unset hostonly
if [[ -f $dracutbasedir/dracut-functions ]]; then
. $dracutbasedir/dracut-functions
else
echo "Cannot find $dracutbasedir/dracut-functions. Are you running from a git checkout?"
echo "Try passing -l as an argument to $0"
exit 1
fi
dracutfunctions=$dracutbasedir/dracut-functions
export dracutfunctions
dinfo "Executing $0 $dracut_args"
omit_drivers_corrected=""
for d in $omit_drivers; do
strstr " $drivers $add_drivers " " $d " && continue
omit_drivers_corrected+="$d|"
done
omit_drivers="${omit_drivers_corrected%|}"
unset omit_drivers_corrected
# This is kinda legacy -- eventually it should go away.
case $dracutmodules in
""|auto) dracutmodules="all" ;;
esac
[[ $2 ]] && kernel=$2 || kernel=$(uname -r)
[[ $1 ]] && outfile=$1 || outfile="/boot/initramfs-$kernel.img"
abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
srcmods="/lib/modules/$kernel/"
[[ $drivers_dir ]] && srcmods="$drivers_dir"
export srcmods
if [[ -f $outfile && ! $force ]]; then
derror "Will not override existing initramfs ($outfile) without --force"
exit 1
fi
outdir=$(dirname "$outfile")
if ! [[ -d "$outdir" ]]; then
derror "Can't write $outfile: Directory $outdir does not exist."
exit 1
fi
if ! [[ -w "$outdir" ]]; then
derror "No permission to write $outdir."
exit 1
fi
if [[ -f "$outfile" ]] && ! [[ -w "$outfile" ]]; then
derror "No permission to write $outfile."
exit 1
fi
hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency initqueue initqueue-finished initqueue-settled initqueue-timeout
"
[[ -n "$TMPDIR" ]] && ! [[ -w "$TMPDIR" ]] && unset TMPDIR
readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
trap 'ret=$?;rm -rf "$initdir";exit $ret;' EXIT # clean up after ourselves no matter how we die.
trap 'exit 1;' SIGINT # clean up after ourselves no matter how we die.
# Need to be able to have non-root users read stuff (rpcbind etc)
chmod 755 "$initdir"
export initdir hookdirs dracutbasedir dracutmodules drivers \
fw_dir drivers_dir debug beverbose no_kernel kernel_only \
add_drivers omit_drivers mdadmconf lvmconf filesystems
if [[ $kernel_only != yes ]]; then
# Create some directory structure first
for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/log var/run $hookdirs; do
inst_dir "/$d"
done
fi
# check all our modules to see if they should be sourced.
# This builds a list of modules that we will install next.
check_modules
modules_loaded=" "
# source our modules.
for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
_d_mod=${moddir##*/}; _d_mod=${_d_mod#[0-9][0-9]}
if strstr "$mods_to_load" " $_d_mod "; then
if [[ $kernel_only = yes ]]; then
[[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
else
[[ -x "$moddir/install" ]] && . "$moddir/install"
if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
. "$moddir/installkernel"
fi
fi
modules_loaded+="$_d_mod "
mods_to_load=${mods_to_load// $_d_mod /}
fi
done
unset moddir
## final stuff that has to happen
# generate module dependencies for the initrd
if [[ -d $initdir/lib/modules/$kernel ]]; then
if ! depmod -a -b "$initdir" $kernel; then
derror "\"depmod -a $kernel\" failed."
exit 1
fi
fi
if [[ $include_src && $include_target ]]; then
if [[ -f $include_src ]]; then
inst $include_src $include_target
else
mkdir -p "$initdir$include_target"
cp -a -t "$initdir$include_target" "$include_src"/*
fi
fi
for item in $install_items; do
dracut_install "$item"
done
unset item
# make sure that library links are correct and up to date
cp -ar /etc/ld.so.conf* "$initdir"/etc
ldconfig -r "$initdir" || [[ $(id -u) != "0" ]] && dinfo "ldconfig might need uid=0 (root) for chroot()"
[[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
# strip binaries
if [[ $do_strip = yes ]] ; then
for p in strip grep find; do
if ! which $p >/dev/null 2>&1; then
dwarn "Could not find '$p'. Not stripping binaries in the initramfs."
do_strip=no
fi
done
fi
if [[ $do_strip = yes ]] ; then
for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '*/lib/modules/*.ko' \) ); do
# do not strip files with a .hmac file,
# because that would alter the checksum
if ! [[ -f "${f%/*}/.${f##*/}.hmac" ]]; then
dinfo "Stripping '$f'"
strip -g "$f" 2>/dev/null|| :
else
dinfo "Not stripping '$f', because it has a hmac checksum file."
fi
done
fi
if strstr "$modules_loaded" " fips " && command -v prelink >/dev/null; then
for i in $initdir/bin/* \
$initdir/bin/* \
$initdir/usr/bin/* \
$initdir/usr/sbin/*; do
[ -x $i ] && prelink -u $i &>/dev/null
done
fi
type pigz &>/dev/null && gzip=pigz || gzip=gzip
if ! ( set -o pipefail; umask 077; cd "$initdir"; find . |cpio -R root:root -H newc -o --quiet| \
$gzip -9 > "$outfile"; ); then
derror "dracut: creation of $outfile failed"
rm -f "$outfile"
exit 1
fi
dinfo "Wrote $outfile"
dinfo $(ls -l "$outfile")
exit 0