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   --ignore-kernel-modules
  50                         Don't try to load modules. It automatically implies
  51                         '--no-kernel'. It's assumed that everything needed
  52                         is built into kernel.
  53   --strip               Strip binaries in the initramfs
  54   --nostrip             Do not strip binaries in the initramfs (default)
  55   --mdadmconf           Include local /etc/mdadm.conf
  56   --nomdadmconf         Do not include local /etc/mdadm.conf
  57   --lvmconf             Include local /etc/lvm/lvm.conf
  58   --nolvmconf             Do not include local /etc/lvm/lvm.conf
  59   -h, --help            This message
  60   --debug               Output debug information of the build process
  61   -v, --verbose         Verbose output during the build process
  62   -c, --conf [FILE]     Specify configuration file to use.
  63                          Default: /etc/dracut.conf
  64   --confdir [DIR]       Specify configuration directory to use *.conf files from.
  65                          Default: /etc/dracut.conf.d
  66   -l, --local           Local mode. Use modules from the current working
  67                          directory instead of the system-wide installed in
  68                          /usr/share/dracut/modules.d.
  69                          Useful when running dracut from a git checkout.
  70   -H, --hostonly        Host-Only mode: Install only what is needed for
  71                          booting the local host instead of a generic host.
  72   --fstab               Use /etc/fstab to determine the root device.
  73   -i, --include [SOURCE] [TARGET]
  74                         Include the files in the SOURCE directory into the
  75                          Target directory in the final initramfs.
  76   -I, --install [LIST]  Install the space separated list of files into the
  77                          initramfs.
  78 "
  79 }
  80
  81 while (($# > 0)); do
  82     case $1 in
  83         -f|--force) force=yes;;
  84         -m|--modules) dracutmodules_l="$dracutmodules_l $2"; shift;;
  85         -o|--omit) omit_dracutmodules_l="$omit_dracutmodules_l $2"; shift;;
  86         -a|--add) add_dracutmodules_l="$add_dracutmodules_l $2"; shift;;
  87         -d|--drivers) drivers_l="$drivers_l $2"; shift;;
  88         --add-drivers) add_drivers_l="$add_drivers_l $2"; shift;;
  89         --filesystems) filesystems_l="$filesystems_l $2"; shift;;
  90         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  91         --fwdir) fw_dir_l="$fw_dir_l:$2"; shift;;
  92         --kernel-only) kernel_only="yes"; no_kernel="no";;
  93         --no-kernel) kernel_only="no"; no_kernel="yes";;
  94     --ignore-kernel-modules) kernel_only="no"; no_kernel="yes"
  95         ignore_kmodules="yes"
  96         omit_dracutmodules_l+=\ kernel-modules
  97         ;;
  98         --strip) do_strip_l="yes";;
  99         --nostrip) do_strip_l="no";;
 100         --mdadmconf) mdadmconf_l="yes";;
 101         --nomdadmconf) mdadmconf_l="no";;
 102         --lvmconf) lvmconf_l="yes";;
 103         --nolvmconf) lvmconf_l="no";;
 104         -h|--help) usage; exit 1 ;;
 105         --debug) debug="yes";;
 106         -v|--verbose) beverbose="yes";;
 107         -c|--conf) conffile="$2"; shift;;
 108         --confdir) confdir="$2"; shift;;
 109         -l|--local) allowlocal="yes" ;;
 110         -H|--hostonly) hostonly_l="yes" ;;
 111         --fstab) use_fstab_l="yes" ;;
 112         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
 113         -I|--install) install_items="$2"; shift;;
 114         -*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
 115         *) break ;;
 116     esac
 117     shift
 118 done
 119
 120 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 121 export PATH
 122
 123 [[ $debug ]] && {
 124     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
 125     set -x
 126 }
 127
 128 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 129
 130 [[ $allowlocal && -f "$(readlink -f $(dirname $0))/dracut-functions" ]] && dracutbasedir="$(dirname $0)"
 131
 132 # if we were not passed a config file, try the default one
 133 if [[ ! -f $conffile ]]; then
 134     [[ $allowlocal ]] || conffile="/etc/dracut.conf"
 135     [[ $allowlocal ]] && conffile="$dracutbasedir/dracut.conf"
 136 fi
 137
 138 if [[ ! -d $confdir ]]; then
 139     [[ $allowlocal ]] || confdir="/etc/dracut.conf.d"
 140     [[ $allowlocal ]] && confdir="$dracutbasedir/dracut.conf.d"
 141 fi
 142
 143 # source our config file
 144 [[ -f $conffile ]] && . "$conffile"
 145
 146 # source our config dir
 147 if [ "$confdir" ] && [  -d "$confdir" ]; then
 148     for f in "$confdir"/*.conf; do
 149         [ -e "$f" ] && . "$f"
 150     done
 151 fi
 152
 153 # these optins add to the stuff in the config file
 154 [[ $add_dracutmodules_l ]] && add_dracutmodules+=" $add_dracutmodules_l"
 155 [[ $add_drivers_l ]] && add_drivers+=" $add_drivers_l"
 156
 157 # these options override the stuff in the config file
 158 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
 159 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
 160 [[ $drivers_l ]] && drivers=$drivers_l
 161 [[ $filesystems_l ]] && filesystems=$filesystems_l
 162 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
 163 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
 164 [[ $do_strip_l ]] && do_strip=$do_strip_l
 165 [[ $hostonly_l ]] && hostonly=$hostonly_l
 166 [[ $use_fstab_l ]] && use_fstab=$use_fstab_l
 167 [[ $mdadmconf_l ]] && mdadmconf=$mdadmconf_l
 168 [[ $lvmconf_l ]] && lvmconf=$lvmconf_l
 169 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
 170 [[ $fw_dir ]] || fw_dir=/lib/firmware
 171 [[ $do_strip ]] || do_strip=no
 172 # eliminate IFS hackery when messing with fw_dir
 173 fw_dir=${fw_dir//:/ }
 174
 175 [[ $hostonly = yes ]] && hostonly="-h"
 176 [[ $hostonly != "-h" ]] && unset hostonly
 177
 178 if [[ -f $dracutbasedir/dracut-functions ]]; then
 179    . $dracutbasedir/dracut-functions
 180 else
 181    echo "Cannot find $dracutbasedir/dracut-functions. Are you running from a git checkout?"
 182    echo "Try passing -l as an argument to $0"
 183    exit 1
 184 fi
 185
 186 dracutfunctions=$dracutbasedir/dracut-functions
 187 export dracutfunctions
 188
 189 # This is kinda legacy -- eventually it should go away.
 190 case $dracutmodules in
 191     ""|auto) dracutmodules="all" ;;
 192 esac
 193
 194 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 195 [[ $1 ]] && outfile=$1 || outfile="/boot/initramfs-$kernel.img"
 196 abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 197
 198 srcmods="/lib/modules/$kernel/"
 199 [[ $drivers_dir ]] && {
 200     if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.7; then
 201         derror 'To use --kmoddir option module-init-tools >= 3.7 is required.'
 202         exit 1
 203     fi
 204     srcmods="$drivers_dir"
 205 }
 206 export srcmods
 207
 208 if [[ -f $outfile && ! $force ]]; then
 209     echo "Will not override existing initramfs ($outfile) without --force"
 210     exit 1
 211 fi
 212
 213 outdir=$(dirname "$outfile")
 214 if ! [[ -d "$outdir" ]]; then
 215     echo "Can't write $outfile: Directory $outdir does not exist."
 216     exit 1
 217 fi
 218
 219 if ! [[ -w "$outdir" ]]; then
 220     echo "No permission to write $outdir."
 221     exit 1
 222 fi
 223
 224 if [[ -f "$outfile" ]] &&  ! [[ -w "$outfile" ]]; then
 225     echo "No permission to write $outfile."
 226     exit 1
 227 fi
 228
 229 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 230
 231 [[ -n "$TMPDIR" ]] && ! [[ -w "$TMPDIR" ]] && unset TMPDIR
 232 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 233
 234 trap 'ret=$?;rm -rf "$initdir";exit $ret;' EXIT # clean up after ourselves no matter how we die.
 235 trap 'exit 1;' SIGINT # clean up after ourselves no matter how we die.
 236
 237 # Need to be able to have non-root users read stuff (rpcbind etc)
 238 chmod 755 "$initdir"
 239
 240 export initdir hookdirs dracutbasedir dracutmodules drivers \
 241     fw_dir drivers_dir debug beverbose no_kernel kernel_only \
 242     add_drivers mdadmconf lvmconf filesystems ignore_kmodules \
 243     use_fstab
 244
 245 if [[ $kernel_only != yes ]]; then
 246     # Create some directory structure first
 247     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 248         inst_dir "/$d";
 249     done
 250 fi
 251
 252 # check all our modules to see if they should be sourced.
 253 # This builds a list of modules that we will install next.
 254 check_modules
 255
 256 # source our modules.
 257 for moddir in "$dracutbasedir/modules.d"/[0-9][0-9]*; do
 258     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 259     if strstr "$mods_to_load" " $mod "; then
 260         dinfo "*** Sourcing module $mod"
 261         if [[ $kernel_only = yes ]]; then
 262             [[ -x $moddir/installkernel ]] && . "$moddir/installkernel"
 263         else
 264             . "$moddir/install"
 265             if [[ $no_kernel != yes && -x $moddir/installkernel ]]; then
 266                 . "$moddir/installkernel"
 267             fi
 268         fi
 269         mods_to_load=${mods_to_load// $mod /}
 270     fi
 271 done
 272 unset moddir
 273
 274 ## final stuff that has to happen
 275
 276 # generate module dependencies for the initrd
 277 if [[ -d $initdir/lib/modules/$kernel ]]; then
 278     if ! depmod -a -b "$initdir" $kernel; then
 279         derror "\"depmod -a $kernel\" failed."
 280         exit 1
 281     fi
 282 fi
 283
 284 if [[ $include_src && $include_target ]]; then
 285     mkdir -p "$initdir$include_target"
 286     cp -a -t "$initdir$include_target" "$include_src"/*
 287 fi
 288
 289 for item in $install_items; do
 290    dracut_install "$item"
 291 done
 292 unset item
 293
 294 # make sure that library links are correct and up to date
 295 cp -ar /etc/ld.so.conf* "$initdir"/etc
 296 ldconfig -r "$initdir" || [[ $(id -u) != "0" ]] && dinfo "ldconfig might need uid=0 (root) for chroot()"
 297
 298 [[ $beverbose = yes ]] && (du -c "$initdir" | sort -n)
 299
 300 # strip binaries
 301 if [[ $do_strip = yes ]] ; then
 302     for p in strip grep find; do
 303         if ! which $p >/dev/null 2>&1; then
 304             derror "Could not find '$p'. You should run $0 with '--nostrip'."
 305             do_strip=no
 306         fi
 307     done
 308 fi
 309
 310 if [[ $do_strip = yes ]] ; then
 311     for f in $(find "$initdir" -type f \( -perm -0100 -or -perm -0010 -or -perm -0001 -or -path '*/lib/modules/*.ko' \) ); do
 312         dinfo "Stripping $f"
 313         strip -g "$f" 2>/dev/null|| :
 314         #
 315         # FIXME: only strip -g for now
 316         #
 317         #strip -g --strip-unneeded "$f" || :
 318         #note="-R .note"
 319         #if objdump -h $f | grep '^[    ]*[0-9]*[       ]*.note[        ]' -A 1 | \
 320         #    grep -q ALLOC; then
 321         #    note=
 322         #fi
 323         #strip -R .comment $note "$f" || :
 324     done
 325 fi
 326
 327 type hardlink &>/dev/null && {
 328         hardlink "$initdir" 2>&1
 329 }
 330
 331 type pigz &>/dev/null && gzip=pigz || gzip=gzip
 332 ( cd "$initdir"; find . |cpio -R 0:0 -H newc -o --quiet |$gzip -9 > "$outfile"; )
 333 if [ $? -ne 0 ]; then
 334     derror "dracut: creation of $outfile failed"
 335     exit 1
 336 fi
 337
 338 [[ $beverbose = yes ]] && ls -lh "$outfile"
 339
 340 exit 0
 341