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 (default)
  50   --nostrip             Do not strip binaries in the initramfs
  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 options override the stuff in the config file
 142 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
 143 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
 144 [[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
 145 [[ $drivers_l ]] && drivers=$drivers_l
 146 [[ $add_drivers_l ]] && add_drivers="$add_drivers $add_drivers_l"
 147 [[ $filesystems_l ]] && filesystems=$filesystems_l
 148 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
 149 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
 150 [[ $do_strip_l ]] && do_strip=$do_strip_l
 151 [[ $hostonly_l ]] && hostonly=$hostonly_l
 152 [[ $mdadmconf_l ]] && mdadmconf=$mdadmconf_l
 153 [[ $lvmconf_l ]] && lvmconf=$lvmconf_l
 154 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 155 [[ $fw_dir ]] || fw_dir=/lib/firmware
 156 [[ $do_strip ]] || do_strip=yes
 157 # eliminate IFS hackery when messing with fw_dir
 158 fw_dir=${fw_dir//:/ }
 159
 160 [[ $hostonly = yes ]] && hostonly="-h"
 161 [[ $hostonly != "-h" ]] && unset hostonly
 162
 163 if [[ -f $dracutbasedir/dracut-functions ]]; then
 164    . $dracutbasedir/dracut-functions
 165 else
 166    echo "Cannot find $dracutbasedir/dracut-functions. Are you running from a git checkout?"
 167    echo "Try passing -l as an argument to $0"
 168    exit 1
 169 fi
 170
 171 dracutfunctions=$dracutbasedir/dracut-functions
 172 export dracutfunctions
 173
 174 # This is kinda legacy -- eventually it should go away.
 175 case $dracutmodules in
 176     ""|auto) dracutmodules="all" ;;
 177 esac
 178
 179 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 180 [[ $1 ]] && outfile=$1 || outfile="/boot/initramfs-$kernel.img"
 181 abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 182
 183 srcmods="/lib/modules/$kernel/"
 184 [[ $drivers_dir ]] && srcmods="$drivers_dir"
 185 export srcmods
 186
 187 if [[ -f $outfile && ! $force ]]; then
 188     echo "Will not override existing initramfs ($outfile) without --force"
 189     exit 1
 190 fi
 191
 192 outdir=$(dirname "$outfile")
 193 if ! [[ -d "$outdir" ]]; then
 194     echo "Can't write $outfile: Directory $outdir does not exist."
 195     exit 1
 196 fi
 197
 198 if ! [[ -w "$outdir" ]]; then
 199     echo "No permission to write $outdir."
 200     exit 1
 201 fi
 202
 203 if [[ -f "$outfile" ]] &&  ! [[ -w "$outfile" ]]; then
 204     echo "No permission to write $outfile."
 205     exit 1
 206 fi
 207
 208 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 209
 210 [[ -n "$TMPDIR" ]] && ! [[ -w "$TMPDIR" ]] && unset TMPDIR
 211 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 212
 213 trap 'ret=$?;rm -rf "$initdir";exit $ret;' EXIT # clean up after ourselves no matter how we die.
 214 trap 'exit 1;' SIGINT # clean up after ourselves no matter how we die.
 215
 216 # Need to be able to have non-root users read stuff (rpcbind etc)
 217 chmod 755 "$initdir"
 218
 219 export initdir hookdirs dracutbasedir dracutmodules drivers \
 220     fw_dir drivers_dir debug beverbose no_kernel kernel_only \
 221     add_drivers mdadmconf lvmconf filesystems
 222
 223 if [[ $kernel_only != yes ]]; then
 224     # Create some directory structure first
 225     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 226         inst_dir "/$d";
 227     done
 228 fi
 229
 230 # check all our modules to see if they should be sourced.
 231 # This builds a list of modules that we will install next.
 232 check_modules
 233
 234 # source our modules.
 235 for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
 236     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 237     if strstr "$mods_to_load" " $mod "; then
 238         if [[ $kernel_only = yes ]]; then
 239             [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
 240         else
 241             . "$moddir/install"
 242             if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
 243                 . "$moddir/installkernel"
 244             fi
 245         fi
 246         mods_to_load=${mods_to_load// $mod /}
 247     fi
 248 done
 249 unset moddir
 250
 251 ## final stuff that has to happen
 252
 253 # generate module dependencies for the initrd
 254 if [[ -d $initdir/lib/modules/$kernel ]]; then
 255     if ! depmod -a -b "$initdir" $kernel; then
 256         derror "\"depmod -a $kernel\" failed."
 257         exit 1
 258     fi
 259 fi
 260
 261 if [[ $include_src && $include_target ]]; then
 262     mkdir -p "$initdir$include_target"
 263     cp -a -t "$initdir$include_target" "$include_src"/*
 264 fi
 265
 266 for item in $install_items; do
 267    dracut_install "$item"
 268 done
 269 unset item
 270
 271 # make sure that library links are correct and up to date
 272 cp -ar /etc/ld.so.conf* "$initdir"/etc
 273 ldconfig -r "$initdir" || [[ $(id -u) != "0" ]] && dinfo "ldconfig might need uid=0 (root) for chroot()"
 274
 275 [[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
 276
 277 # strip binaries
 278 if [[ $do_strip = yes ]] ; then
 279     for p in strip objdump sed grep find; do
 280         if ! which $p >/dev/null 2>&1; then
 281             derror "Could not find '$p'. You should run $0 with '--nostrip'."
 282             do_strip=no
 283         fi
 284     done
 285 fi
 286
 287 if [[ $do_strip = yes ]] ; then
 288     for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '/lib/modules/*.ko' \) -exec file {} \; |
 289         grep -v ' shared object,' |
 290         sed -n -e 's/^\(.*\):[  ]*ELF.*, not stripped/\1/p'); do
 291         dinfo "Stripping $f"
 292         strip -g "$f" || :
 293         #
 294         # FIXME: only strip -g for now
 295         #
 296         #strip -g --strip-unneeded "$f" || :
 297         #note="-R .note"
 298         #if objdump -h $f | grep '^[    ]*[0-9]*[       ]*.note[        ]' -A 1 | \
 299         #    grep -q ALLOC; then
 300         #    note=
 301         #fi
 302         #strip -R .comment $note "$f" || :
 303     done
 304 fi
 305
 306 type pigz &>/dev/null && gzip=pigz || gzip=gzip
 307 ( cd "$initdir"; find . |cpio -R 0:0 -H newc -o --quiet |$gzip -9 > "$outfile"; )
 308 if [ $? -ne 0 ]; then
 309     derror "dracut: creation of $outfile failed"
 310     exit 1
 311 fi
 312
 313 [[ $beverbose = yes ]] && ls -lh "$outfile"
 314
 315 exit 0
 316