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                          include in the initramfs.
  38   -k, --kmoddir [DIR]   Specify the directory, where to look for kernel
  39                         modules
  40   --fwdir [DIR]         Specify additional directories, where to look for
  41                         firmwares, separated by :
  42   --kernel-only         Only install kernel drivers and firmware files
  43   --no-kernel           Do not install kernel drivers and firmware files
  44   --strip               Strip binaries in the initramfs (default)
  45   --nostrip             Do not strip binaries in the initramfs
  46   -h, --help            This message
  47   --debug               Output debug information of the build process
  48   -v, --verbose         Verbose output during the build process
  49   -c, --conf [FILE]     Specify configuration file to use.
  50                          Default: /etc/dracut.conf
  51   -l, --local           Local mode. Use modules from the current working
  52                          directory instead of the system-wide installed in
  53                          /usr/share/dracut/modules.d.
  54                          Useful when running dracut from a git checkout.
  55   -H, --hostonly          Host-Only mode: Install only what is needed for
  56                          booting the local host instead of a generic host.
  57   -i, --include [SOURCE] [TARGET]
  58                         Include the files in the SOURCE directory into the
  59                          Target directory in the final initramfs.
  60   -I, --install [LIST]  Install the space separated list of files into the
  61                          initramfs.
  62 "
  63 }
  64
  65 while (($# > 0)); do
  66     case $1 in
  67         -f|--force) force=yes;;
  68         -m|--modules) dracutmodules_l="$2"; shift;;
  69         -o|--omit) omit_dracutmodules_l="$2"; shift;;
  70         -a|--add) add_dracutmodules_l="$2"; shift;;
  71         -d|--drivers) drivers_l="$2"; shift;;
  72         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  73         --fwdir) fw_dir_l="$2"; shift;;
  74         --kernel-only) kernel_only="yes"; nokernel="no";;
  75         --no-kernel) kernel_only="no"; no_kernel="yes";;
  76         --strip) do_strip_l="yes";;
  77         --nostrip) do_strip_l="no";;
  78         -h|--help) usage; exit 1 ;;
  79         --debug) debug="yes";;
  80         -v|--verbose) beverbose="yes";;
  81         -c|--conf) conffile="$2"; shift;;
  82         -l|--local) allowlocal="yes" ;;
  83         -H|--hostonly) hostonly="-h" ;;
  84         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
  85         -I|--install) install_items="$2"; shift;;
  86         -*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
  87         *) break ;;
  88     esac
  89     shift
  90 done
  91
  92 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH
  93
  94 [[ $debug ]] && {
  95     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
  96     set -x
  97 }
  98
  99 # if we were not passed a config file, try the default one
 100 [[ ! -f $conffile ]] && conffile="/etc/dracut.conf"
 101
 102 # source our config file
 103 [[ -f $conffile ]] && . "$conffile"
 104
 105 # these options override the stuff in the config file
 106 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
 107 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
 108 [[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
 109 [[ $drivers_l ]] && drivers=$drivers_l
 110 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
 111 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
 112 [[ $do_strip_l ]] && do_strip=$do_strip_l
 113 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 114 [[ $fw_dir ]] || fw_dir=/lib/firmware
 115 [[ $do_strip ]] || do_strip=yes
 116 # eliminate IFS hackery when messing with fw_dir
 117 fw_dir=${fw_dir//:/ }
 118
 119 [[ $allowlocal && -f "$(dirname $0)/dracut-functions" ]] && dsrc="$(dirname $0)" || dsrc=$dracutbasedir
 120
 121 if [[ -f $dsrc/dracut-functions ]]; then
 122    . $dsrc/dracut-functions
 123 else
 124    echo "Cannot find $dsrc/dracut-functions. Are you running from a git checkout?"
 125    echo "Try passing -l as an argument to $0"
 126    exit 1
 127 fi
 128
 129 dracutfunctions=$dsrc/dracut-functions
 130 export dracutfunctions
 131
 132 # This is kinda legacy -- eventually it should go away.
 133 case $dracutmodules in
 134     ""|auto) dracutmodules="all" ;;
 135 esac
 136
 137 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 138 [[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initrd-$kernel.img"
 139
 140 srcmods="/lib/modules/$kernel/"
 141 [[ $drivers_dir ]] && srcmods="$drivers_dir"
 142 export srcmods
 143
 144 if [[ -f $outfile && ! $force ]]; then
 145     echo "Will not override existing initramfs ($outfile) without --force"
 146     exit 1
 147 fi
 148
 149 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 150
 151 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 152 trap 'rm -rf "$initdir"' 0 # clean up after ourselves no matter how we die.
 153
 154 # Need to be able to have non-root users read stuff (rpcbind etc)
 155 chmod 755 "$initdir"
 156
 157 export initdir hookdirs dsrc dracutmodules drivers \
 158     fw_dir drivers_dir debug beverbose no_kernel kernel_only
 159
 160 if [[ $kernel_only != yes ]]; then
 161     # Create some directory structure first
 162     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 163         mkdir -p "$initdir/$d";
 164     done
 165 fi
 166
 167 # check all our modules to see if they should be sourced.
 168 # This builds a list of modules that we will install next.
 169 check_modules
 170
 171 #source our modules.
 172 for moddir in "$dsrc/modules.d"/[0-9][0-9]*; do
 173     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 174     if strstr "$mods_to_load" " $mod "; then
 175         if [[ $kernel_only = yes ]]; then
 176             [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
 177         else
 178             . "$moddir/install"
 179             if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
 180                 . "$moddir/installkernel"
 181             fi
 182         fi
 183         mods_to_load=${mods_to_load// $mod /}
 184     fi
 185 done
 186 unset moddir
 187 echo $mods_to_load
 188
 189 ## final stuff that has to happen
 190
 191 # generate module dependencies for the initrd
 192 if [[ -d $initdir/lib/modules/$kernel ]]; then
 193     if ! depmod -a -b "$initdir" $kernel; then
 194         echo "\"depmod -a $kernel\" failed."
 195         exit 1
 196     fi
 197 fi
 198
 199 # make sure that library links are correct and up to date
 200 ldconfig -n -r "$initdir" /lib* /usr/lib*
 201
 202 if [[ $include_src && $include_target ]]; then
 203     mkdir -p "$initdir$include_target"
 204     cp -a -t "$initdir$include_target" "$include_src"/*
 205 fi
 206
 207 for item in $install_items; do
 208    dracut_install "$item"
 209 done
 210 unset item
 211
 212 [[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
 213
 214 # strip binaries
 215 if [[ $do_strip = yes ]] ; then
 216     for p in strip objdump sed grep find; do
 217         if ! which $p >/dev/null 2>&1; then
 218             derror "Could not find '$p'. You should run $0 with '--nostrip'."
 219             do_strip=no
 220         fi
 221     done
 222 fi
 223
 224 if [[ $do_strip = yes ]] ; then
 225     for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 \) -exec file {} \; |
 226         grep -v ' shared object,' |
 227         sed -n -e 's/^\(.*\):[  ]*ELF.*, not stripped/\1/p'); do
 228         dinfo "Stripping $f"
 229         strip -g "$f" || :
 230         #
 231         # FIXME: only strip -g for now
 232         #
 233         #strip -g --strip-unneeded "$f" || :
 234         #note="-R .note"
 235         #if objdump -h $f | grep '^[    ]*[0-9]*[       ]*.note[        ]' -A 1 | \
 236         #    grep -q ALLOC; then
 237         #    note=
 238         #fi
 239         #strip -R .comment $note "$f" || :
 240     done
 241 fi
 242
 243 ( cd "$initdir"; find . |cpio -R 0:0 -H newc -o |gzip -9 > "$outfile"; )
 244
 245 [[ $beverbose = yes ]] && ls -lh "$outfile"
 246
 247 exit 0
 248