path: root/dracut

#!/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/>.
#


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.
  --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;;
	--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;;
	-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

[[ $debug ]] && { 
    export PS4='${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

# source our config file
[[ -f $conffile ]] && . "$conffile"

# these options override the stuff in the config file
[[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
[[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
[[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
[[ $drivers_l ]] && drivers=$drivers_l
[[ $add_drivers_l ]] && add_drivers=$add_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
[[ $do_strip ]] || do_strip=yes
# eliminate IFS hackery when messing with fw_dir
fw_dir=${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

# This is kinda legacy -- eventually it should go away.
case $dracutmodules in
    ""|auto) dracutmodules="all" ;;
esac

[[ $2 ]] && kernel=$2 || kernel=$(uname -r)
[[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initramfs-$kernel.img"

srcmods="/lib/modules/$kernel/"
[[ $drivers_dir ]] && srcmods="$drivers_dir"
export srcmods

if [[ -f $outfile && ! $force ]]; then
    echo "Will not override existing initramfs ($outfile) without --force"
    exit 1
fi

if ! [[ -w $(dirname $outfile) ]]; then
    echo "No permission to write $outfile."
    exit 1
fi

hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"

[[ -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 mdadmconf lvmconf filesystems

if [[ $kernel_only != yes ]]; then
    # Create some directory structure first
    for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do 
	inst_dir "/$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
  
# source our modules.
for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
    mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
    if strstr "$mods_to_load" " $mod "; then
	if [[ $kernel_only = yes ]]; then
	    [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
	else
	    . "$moddir/install"
	    if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
		. "$moddir/installkernel"
	    fi
	fi
	mods_to_load=${mods_to_load// $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

# make sure that library links are correct and up to date
ldconfig -n -r "$initdir" /lib* /usr/lib*

if [[ $include_src && $include_target ]]; then
    mkdir -p "$initdir$include_target"
    cp -a -t "$initdir$include_target" "$include_src"/*
fi

for item in $install_items; do
   dracut_install "$item"
done
unset item

[[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)

# strip binaries 
if [[ $do_strip = yes ]] ; then
    for p in strip objdump sed grep find; do 
	if ! which $p >/dev/null 2>&1; then
	    derror "Could not find '$p'. You should run $0 with '--nostrip'."
	    do_strip=no
	fi
    done
fi

if [[ $do_strip = yes ]] ; then
    for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '/lib/modules/*.ko' \) -exec file {} \; | 
	grep -v ' shared object,' | 
	sed -n -e 's/^\(.*\):[ 	]*ELF.*, not stripped/\1/p'); do
	dinfo "Stripping $f"
	strip -g "$f" || :
        #
        # FIXME: only strip -g for now
        #
	#strip -g --strip-unneeded "$f" || :
	#note="-R .note"
	#if objdump -h $f | grep '^[ 	]*[0-9]*[ 	]*.note[ 	]' -A 1 | \
	#    grep -q ALLOC; then
	#    note=
	#fi
	#strip -R .comment $note "$f" || :
    done
fi

( cd "$initdir"; find . |cpio -R 0:0 -H newc -o --quiet |gzip -9 > "$outfile"; ) 
if [ $? -ne 0 ]; then
    derror "dracut: creation of $outfile failed"
    exit 1
fi 

[[ $beverbose = yes ]] && ls -lh "$outfile"

exit 0