dracut

   1 #!/bin/bash
   2 #
   3 # Generator script for a dracut initramfs
   4 # Tries to retain some degree of compatibility with the command line
   5 # of the various mkinitrd implementations out there
   6 #
   7
   8 # Copyright 2005-2009 Red Hat, Inc.  All rights reserved.
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 #
  23
  24
  25 usage() {
  26 #                                                       80x25 linebreak here ^
  27         echo "Usage: $0 [OPTION]... <initramfs> <kernel-version>
  28 Creates initial ramdisk images for preloading modules
  29
  30   -f, --force           Overwrite existing initramfs file.
  31   -m, --modules [LIST]  Specify a space-separated list of dracut modules to
  32                          call when building the initramfs. Modules are located
  33                          in /usr/share/dracut/modules.d.
  34   -o, --omit [LIST]     Omit a space-separated list of dracut modules.
  35   -a, --add [LIST]      Add a space-separated list of dracut modules.
  36   -d, --drivers [LIST]  Specify a space-separated list of kernel modules to
  37                         exclusively include in the initramfs.
  38   --add-drivers [LIST]  Specify a space-separated list of kernel
  39                         modules to add to the initramfs.
  40   --filesystems [LIST]  Specify a space-separated list of kernel filesystem
  41                         modules to exclusively include in the generic
  42                         initramfs.
  43   -k, --kmoddir [DIR]   Specify the directory, where to look for kernel
  44                         modules
  45   --fwdir [DIR]         Specify additional directories, where to look for
  46                         firmwares, separated by :
  47   --kernel-only         Only install kernel drivers and firmware files
  48   --no-kernel           Do not install kernel drivers and firmware files
  49   --strip               Strip binaries in the initramfs
  50   --nostrip             Do not strip binaries in the initramfs (default)
  51   --mdadmconf           Include local /etc/mdadm.conf
  52   --nomdadmconf         Do not include local /etc/mdadm.conf
  53   --lvmconf             Include local /etc/lvm/lvm.conf
  54   --nolvmconf             Do not include local /etc/lvm/lvm.conf
  55   -h, --help            This message
  56   --debug               Output debug information of the build process
  57   -v, --verbose         Verbose output during the build process
  58   -c, --conf [FILE]     Specify configuration file to use.
  59                          Default: /etc/dracut.conf
  60   -l, --local           Local mode. Use modules from the current working
  61                          directory instead of the system-wide installed in
  62                          /usr/share/dracut/modules.d.
  63                          Useful when running dracut from a git checkout.
  64   -H, --hostonly          Host-Only mode: Install only what is needed for
  65                          booting the local host instead of a generic host.
  66   -i, --include [SOURCE] [TARGET]
  67                         Include the files in the SOURCE directory into the
  68                          Target directory in the final initramfs.
  69   -I, --install [LIST]  Install the space separated list of files into the
  70                          initramfs.
  71 "
  72 }
  73
  74 while (($# > 0)); do
  75     case $1 in
  76         -f|--force) force=yes;;
  77         -m|--modules) dracutmodules_l="$2"; shift;;
  78         -o|--omit) omit_dracutmodules_l="$2"; shift;;
  79         -a|--add) add_dracutmodules_l="$2"; shift;;
  80         -d|--drivers) drivers_l="$2"; shift;;
  81         --add-drivers) add_drivers_l="$2"; shift;;
  82         --filesystems) filesystems_l="$2"; shift;;
  83         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  84         --fwdir) fw_dir_l="$2"; shift;;
  85         --kernel-only) kernel_only="yes"; no_kernel="no";;
  86         --no-kernel) kernel_only="no"; no_kernel="yes";;
  87         --strip) do_strip_l="yes";;
  88         --nostrip) do_strip_l="no";;
  89         --mdadmconf) mdadmconf_l="yes";;
  90         --nomdadmconf) mdadmconf_l="no";;
  91         --lvmconf) lvmconf_l="yes";;
  92         --nolvmconf) lvmconf_l="no";;
  93         -h|--help) usage; exit 1 ;;
  94         --debug) debug="yes";;
  95         -v|--verbose) beverbose="yes";;
  96         -c|--conf) conffile="$2"; shift;;
  97         --confdir) confdir="$2"; shift;;
  98         -l|--local) allowlocal="yes" ;;
  99         -H|--hostonly) hostonly_l="yes" ;;
 100         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
 101         -I|--install) install_items="$2"; shift;;
 102         -*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
 103         *) break ;;
 104     esac
 105     shift
 106 done
 107
 108 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 109 export PATH
 110
 111 [[ $debug ]] && {
 112     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
 113     set -x
 114 }
 115
 116 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 117
 118 [[ $allowlocal && -f "$(readlink -f $(dirname $0))/dracut-functions" ]] && dracutbasedir="$(dirname $0)"
 119
 120 # if we were not passed a config file, try the default one
 121 if [[ ! -f $conffile ]]; then
 122     [[ $allowlocal ]] || conffile="/etc/dracut.conf"
 123     [[ $allowlocal ]] && conffile="$dracutbasedir/dracut.conf"
 124 fi
 125
 126 if [[ ! -d $confdir ]]; then
 127     [[ $allowlocal ]] || confdir="/etc/dracut.conf.d"
 128     [[ $allowlocal ]] && confdir="$dracutbasedir/dracut.conf.d"
 129 fi
 130
 131 # source our config dir
 132 if [ "$confdir" ] && [  -d "$confdir" ]; then
 133     for f in "$confdir"/*.conf; do
 134         [ -e "$f" ] && . "$f"
 135     done
 136 fi
 137
 138 # source our config file
 139 [[ -f $conffile ]] && . "$conffile"
 140
 141 # these optins add to the stuff in the config file
 142 [[ $add_dracutmodules_l ]] && add_dracutmodules+=" $add_dracutmodules_l"
 143 [[ $add_drivers_l ]] && add_drivers+=" $add_drivers_l"
 144
 145 # these options override the stuff in the config file
 146 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
 147 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
 148 [[ $drivers_l ]] && drivers=$drivers_l
 149 [[ $filesystems_l ]] && filesystems=$filesystems_l
 150 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
 151 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
 152 [[ $do_strip_l ]] && do_strip=$do_strip_l
 153 [[ $hostonly_l ]] && hostonly=$hostonly_l
 154 [[ $mdadmconf_l ]] && mdadmconf=$mdadmconf_l
 155 [[ $lvmconf_l ]] && lvmconf=$lvmconf_l
 156 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 157 [[ $fw_dir ]] || fw_dir=/lib/firmware
 158 [[ $do_strip ]] || do_strip=no
 159 # eliminate IFS hackery when messing with fw_dir
 160 fw_dir=${fw_dir//:/ }
 161
 162 [[ $hostonly = yes ]] && hostonly="-h"
 163 [[ $hostonly != "-h" ]] && unset hostonly
 164
 165 if [[ -f $dracutbasedir/dracut-functions ]]; then
 166    . $dracutbasedir/dracut-functions
 167 else
 168    echo "Cannot find $dracutbasedir/dracut-functions. Are you running from a git checkout?"
 169    echo "Try passing -l as an argument to $0"
 170    exit 1
 171 fi
 172
 173 dracutfunctions=$dracutbasedir/dracut-functions
 174 export dracutfunctions
 175
 176 # This is kinda legacy -- eventually it should go away.
 177 case $dracutmodules in
 178     ""|auto) dracutmodules="all" ;;
 179 esac
 180
 181 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 182 [[ $1 ]] && outfile=$1 || outfile="/boot/initramfs-$kernel.img"
 183 abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 184
 185 srcmods="/lib/modules/$kernel/"
 186 [[ $drivers_dir ]] && {
 187     if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.7; then
 188         derror 'To use --kmoddir option module-init-tools >= 3.7 is required.'
 189         exit 1
 190     fi
 191     srcmods="$drivers_dir"
 192 }
 193 export srcmods
 194
 195 if [[ -f $outfile && ! $force ]]; then
 196     echo "Will not override existing initramfs ($outfile) without --force"
 197     exit 1
 198 fi
 199
 200 outdir=$(dirname "$outfile")
 201 if ! [[ -d "$outdir" ]]; then
 202     echo "Can't write $outfile: Directory $outdir does not exist."
 203     exit 1
 204 fi
 205
 206 if ! [[ -w "$outdir" ]]; then
 207     echo "No permission to write $outdir."
 208     exit 1
 209 fi
 210
 211 if [[ -f "$outfile" ]] &&  ! [[ -w "$outfile" ]]; then
 212     echo "No permission to write $outfile."
 213     exit 1
 214 fi
 215
 216 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 217
 218 [[ -n "$TMPDIR" ]] && ! [[ -w "$TMPDIR" ]] && unset TMPDIR
 219 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 220
 221 trap 'ret=$?;rm -rf "$initdir";exit $ret;' EXIT # clean up after ourselves no matter how we die.
 222 trap 'exit 1;' SIGINT # clean up after ourselves no matter how we die.
 223
 224 # Need to be able to have non-root users read stuff (rpcbind etc)
 225 chmod 755 "$initdir"
 226
 227 export initdir hookdirs dracutbasedir dracutmodules drivers \
 228     fw_dir drivers_dir debug beverbose no_kernel kernel_only \
 229     add_drivers mdadmconf lvmconf filesystems
 230
 231 if [[ $kernel_only != yes ]]; then
 232     # Create some directory structure first
 233     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 234         inst_dir "/$d";
 235     done
 236 fi
 237
 238 # check all our modules to see if they should be sourced.
 239 # This builds a list of modules that we will install next.
 240 check_modules
 241
 242 # source our modules.
 243 for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
 244     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 245     if strstr "$mods_to_load" " $mod "; then
 246         if [[ $kernel_only = yes ]]; then
 247             [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
 248         else
 249             . "$moddir/install"
 250             if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
 251                 . "$moddir/installkernel"
 252             fi
 253         fi
 254         mods_to_load=${mods_to_load// $mod /}
 255     fi
 256 done
 257 unset moddir
 258
 259 ## final stuff that has to happen
 260
 261 # generate module dependencies for the initrd
 262 if [[ -d $initdir/lib/modules/$kernel ]]; then
 263     if ! depmod -a -b "$initdir" $kernel; then
 264         derror "\"depmod -a $kernel\" failed."
 265         exit 1
 266     fi
 267 fi
 268
 269 if [[ $include_src && $include_target ]]; then
 270     mkdir -p "$initdir$include_target"
 271     cp -a -t "$initdir$include_target" "$include_src"/*
 272 fi
 273
 274 for item in $install_items; do
 275    dracut_install "$item"
 276 done
 277 unset item
 278
 279 # make sure that library links are correct and up to date
 280 cp -ar /etc/ld.so.conf* "$initdir"/etc
 281 ldconfig -r "$initdir" || [[ $(id -u) != "0" ]] && dinfo "ldconfig might need uid=0 (root) for chroot()"
 282
 283 [[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
 284
 285 # strip binaries
 286 if [[ $do_strip = yes ]] ; then
 287     for p in strip grep find; do
 288         if ! which $p >/dev/null 2>&1; then
 289             derror "Could not find '$p'. You should run $0 with '--nostrip'."
 290             do_strip=no
 291         fi
 292     done
 293 fi
 294
 295 if [[ $do_strip = yes ]] ; then
 296     for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '/lib/modules/*.ko' \) ); do
 297         dinfo "Stripping $f"
 298         strip -g "$f" 2>/dev/null|| :
 299         #
 300         # FIXME: only strip -g for now
 301         #
 302         #strip -g --strip-unneeded "$f" || :
 303         #note="-R .note"
 304         #if objdump -h $f | grep '^[    ]*[0-9]*[       ]*.note[        ]' -A 1 | \
 305         #    grep -q ALLOC; then
 306         #    note=
 307         #fi
 308         #strip -R .comment $note "$f" || :
 309     done
 310 fi
 311
 312 type pigz &>/dev/null && gzip=pigz || gzip=gzip
 313 ( cd "$initdir"; find . |cpio -R 0:0 -H newc -o --quiet |$gzip -9 > "$outfile"; )
 314 if [ $? -ne 0 ]; then
 315     derror "dracut: creation of $outfile failed"
 316     exit 1
 317 fi
 318
 319 [[ $beverbose = yes ]] && ls -lh "$outfile"
 320
 321 exit 0
 322