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   --confdir [DIR]       Specify configuration directory to use *.conf files from.
  61                          Default: /etc/dracut.conf.d
  62   -l, --local           Local mode. Use modules from the current working
  63                          directory instead of the system-wide installed in
  64                          /usr/share/dracut/modules.d.
  65                          Useful when running dracut from a git checkout.
  66   -H, --hostonly          Host-Only mode: Install only what is needed for
  67                          booting the local host instead of a generic host.
  68   -i, --include [SOURCE] [TARGET]
  69                         Include the files in the SOURCE directory into the
  70                          Target directory in the final initramfs.
  71   -I, --install [LIST]  Install the space separated list of files into the
  72                          initramfs.
  73 "
  74 }
  75
  76 while (($# > 0)); do
  77     case $1 in
  78         -f|--force) force=yes;;
  79         -m|--modules) dracutmodules_l="$2"; shift;;
  80         -o|--omit) omit_dracutmodules_l="$2"; shift;;
  81         -a|--add) add_dracutmodules_l="$2"; shift;;
  82         -d|--drivers) drivers_l="$2"; shift;;
  83         --add-drivers) add_drivers_l="$2"; shift;;
  84         --filesystems) filesystems_l="$2"; shift;;
  85         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  86         --fwdir) fw_dir_l="$2"; shift;;
  87         --kernel-only) kernel_only="yes"; no_kernel="no";;
  88         --no-kernel) kernel_only="no"; no_kernel="yes";;
  89         --strip) do_strip_l="yes";;
  90         --nostrip) do_strip_l="no";;
  91         --mdadmconf) mdadmconf_l="yes";;
  92         --nomdadmconf) mdadmconf_l="no";;
  93         --lvmconf) lvmconf_l="yes";;
  94         --nolvmconf) lvmconf_l="no";;
  95         -h|--help) usage; exit 1 ;;
  96         --debug) debug="yes";;
  97         -v|--verbose) beverbose="yes";;
  98         -c|--conf) conffile="$2"; shift;;
  99         --confdir) confdir="$2"; shift;;
 100         -l|--local) allowlocal="yes" ;;
 101         -H|--hostonly) hostonly_l="yes" ;;
 102         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
 103         -I|--install) install_items="$2"; shift;;
 104         -*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
 105         *) break ;;
 106     esac
 107     shift
 108 done
 109
 110 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 111 export PATH
 112
 113 [[ $debug ]] && {
 114     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
 115     set -x
 116 }
 117
 118 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 119
 120 [[ $allowlocal && -f "$(readlink -f $(dirname $0))/dracut-functions" ]] && dracutbasedir="$(dirname $0)"
 121
 122 # if we were not passed a config file, try the default one
 123 if [[ ! -f $conffile ]]; then
 124     [[ $allowlocal ]] || conffile="/etc/dracut.conf"
 125     [[ $allowlocal ]] && conffile="$dracutbasedir/dracut.conf"
 126 fi
 127
 128 if [[ ! -d $confdir ]]; then
 129     [[ $allowlocal ]] || confdir="/etc/dracut.conf.d"
 130     [[ $allowlocal ]] && confdir="$dracutbasedir/dracut.conf.d"
 131 fi
 132
 133 # source our config file
 134 [[ -f $conffile ]] && . "$conffile"
 135
 136 # source our config dir
 137 if [ "$confdir" ] && [  -d "$confdir" ]; then
 138     for f in "$confdir"/*.conf; do
 139         [ -e "$f" ] && . "$f"
 140     done
 141 fi
 142
 143 # these optins add to the stuff in the config file
 144 [[ $add_dracutmodules_l ]] && add_dracutmodules+=" $add_dracutmodules_l"
 145 [[ $add_drivers_l ]] && add_drivers+=" $add_drivers_l"
 146
 147 # these options override the stuff in the config file
 148 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
 149 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
 150 [[ $drivers_l ]] && drivers=$drivers_l
 151 [[ $filesystems_l ]] && filesystems=$filesystems_l
 152 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
 153 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
 154 [[ $do_strip_l ]] && do_strip=$do_strip_l
 155 [[ $hostonly_l ]] && hostonly=$hostonly_l
 156 [[ $mdadmconf_l ]] && mdadmconf=$mdadmconf_l
 157 [[ $lvmconf_l ]] && lvmconf=$lvmconf_l
 158 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 159 [[ $fw_dir ]] || fw_dir=/lib/firmware
 160 [[ $do_strip ]] || do_strip=no
 161 # eliminate IFS hackery when messing with fw_dir
 162 fw_dir=${fw_dir//:/ }
 163
 164 [[ $hostonly = yes ]] && hostonly="-h"
 165 [[ $hostonly != "-h" ]] && unset hostonly
 166
 167 if [[ -f $dracutbasedir/dracut-functions ]]; then
 168    . $dracutbasedir/dracut-functions
 169 else
 170    echo "Cannot find $dracutbasedir/dracut-functions. Are you running from a git checkout?"
 171    echo "Try passing -l as an argument to $0"
 172    exit 1
 173 fi
 174
 175 dracutfunctions=$dracutbasedir/dracut-functions
 176 export dracutfunctions
 177
 178 # This is kinda legacy -- eventually it should go away.
 179 case $dracutmodules in
 180     ""|auto) dracutmodules="all" ;;
 181 esac
 182
 183 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 184 [[ $1 ]] && outfile=$1 || outfile="/boot/initramfs-$kernel.img"
 185 abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 186
 187 srcmods="/lib/modules/$kernel/"
 188 [[ $drivers_dir ]] && {
 189     if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.7; then
 190         derror 'To use --kmoddir option module-init-tools >= 3.7 is required.'
 191         exit 1
 192     fi
 193     srcmods="$drivers_dir"
 194 }
 195 export srcmods
 196
 197 if [[ -f $outfile && ! $force ]]; then
 198     echo "Will not override existing initramfs ($outfile) without --force"
 199     exit 1
 200 fi
 201
 202 outdir=$(dirname "$outfile")
 203 if ! [[ -d "$outdir" ]]; then
 204     echo "Can't write $outfile: Directory $outdir does not exist."
 205     exit 1
 206 fi
 207
 208 if ! [[ -w "$outdir" ]]; then
 209     echo "No permission to write $outdir."
 210     exit 1
 211 fi
 212
 213 if [[ -f "$outfile" ]] &&  ! [[ -w "$outfile" ]]; then
 214     echo "No permission to write $outfile."
 215     exit 1
 216 fi
 217
 218 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 219
 220 [[ -n "$TMPDIR" ]] && ! [[ -w "$TMPDIR" ]] && unset TMPDIR
 221 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 222
 223 trap 'ret=$?;rm -rf "$initdir";exit $ret;' EXIT # clean up after ourselves no matter how we die.
 224 trap 'exit 1;' SIGINT # clean up after ourselves no matter how we die.
 225
 226 # Need to be able to have non-root users read stuff (rpcbind etc)
 227 chmod 755 "$initdir"
 228
 229 export initdir hookdirs dracutbasedir dracutmodules drivers \
 230     fw_dir drivers_dir debug beverbose no_kernel kernel_only \
 231     add_drivers mdadmconf lvmconf filesystems
 232
 233 if [[ $kernel_only != yes ]]; then
 234     # Create some directory structure first
 235     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 236         inst_dir "/$d";
 237     done
 238 fi
 239
 240 # check all our modules to see if they should be sourced.
 241 # This builds a list of modules that we will install next.
 242 check_modules
 243
 244 # source our modules.
 245 for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
 246     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 247     if strstr "$mods_to_load" " $mod "; then
 248         dinfo "*** Sourcing module $mod"
 249         if [[ $kernel_only = yes ]]; then
 250             [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
 251         else
 252             . "$moddir/install"
 253             if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
 254                 . "$moddir/installkernel"
 255             fi
 256         fi
 257         mods_to_load=${mods_to_load// $mod /}
 258     fi
 259 done
 260 unset moddir
 261
 262 ## final stuff that has to happen
 263
 264 # generate module dependencies for the initrd
 265 if [[ -d $initdir/lib/modules/$kernel ]]; then
 266     if ! depmod -a -b "$initdir" $kernel; then
 267         derror "\"depmod -a $kernel\" failed."
 268         exit 1
 269     fi
 270 fi
 271
 272 if [[ $include_src && $include_target ]]; then
 273     mkdir -p "$initdir$include_target"
 274     cp -a -t "$initdir$include_target" "$include_src"/*
 275 fi
 276
 277 for item in $install_items; do
 278    dracut_install "$item"
 279 done
 280 unset item
 281
 282 # make sure that library links are correct and up to date
 283 cp -ar /etc/ld.so.conf* "$initdir"/etc
 284 ldconfig -r "$initdir" || [[ $(id -u) != "0" ]] && dinfo "ldconfig might need uid=0 (root) for chroot()"
 285
 286 [[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
 287
 288 # strip binaries
 289 if [[ $do_strip = yes ]] ; then
 290     for p in strip grep find; do
 291         if ! which $p >/dev/null 2>&1; then
 292             derror "Could not find '$p'. You should run $0 with '--nostrip'."
 293             do_strip=no
 294         fi
 295     done
 296 fi
 297
 298 if [[ $do_strip = yes ]] ; then
 299     for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '*/lib/modules/*.ko' \) ); do
 300         dinfo "Stripping $f"
 301         strip -g "$f" 2>/dev/null|| :
 302         #
 303         # FIXME: only strip -g for now
 304         #
 305         #strip -g --strip-unneeded "$f" || :
 306         #note="-R .note"
 307         #if objdump -h $f | grep '^[    ]*[0-9]*[       ]*.note[        ]' -A 1 | \
 308         #    grep -q ALLOC; then
 309         #    note=
 310         #fi
 311         #strip -R .comment $note "$f" || :
 312     done
 313 fi
 314
 315 type pigz &>/dev/null && gzip=pigz || gzip=gzip
 316 ( cd "$initdir"; find . |cpio -R 0:0 -H newc -o --quiet |$gzip -9 > "$outfile"; )
 317 if [ $? -ne 0 ]; then
 318     derror "dracut: creation of $outfile failed"
 319     exit 1
 320 fi
 321
 322 [[ $beverbose = yes ]] && ls -lh "$outfile"
 323
 324 exit 0
 325