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 2008, Red Hat, Inc.  Jeremy Katz <katzj@redhat.com>
   9 # GPLv2 header here
  10
  11
  12 usage() {
  13 #                                                       80x25 linebreak here ^
  14         echo "Usage: $0 [OPTION]... <initramfs> <kernel-version>
  15 Creates initial ramdisk images for preloading modules
  16
  17   -f, --force           Overwrite existing initramfs file.
  18   -m, --modules [LIST]  Specify a space-separated list of dracut modules to
  19                          call when building the initramfs. Modules are located
  20                          in /usr/share/dracut/modules.d.
  21   -o, --omit [LIST]     Omit a space-separated list of dracut modules.
  22   -a, --add [LIST]      Add a space-separated list of dracut modules.
  23   -d, --drivers [LIST]  Specify a space-separated list of kernel modules to
  24                          include in the initramfs.
  25   -k, --kmoddir [DIR]   Specify the directory, where to look for kernel modules
  26   --fwdir [DIR]         Specify additional directory, where to look for
  27                         firmwares
  28   -h, --help            This message
  29   --debug               Output debug information of the build process
  30   -v, --verbose         Verbose output during the build process
  31   -c, --conf [FILE]     Specify configuration file to use.
  32                          Default: /etc/dracut.conf
  33   -l, --local           Local mode. Use modules from the current working
  34                          directory instead of the system-wide installed in
  35                          /usr/share/dracut/modules.d.
  36                          Useful when running dracut from a git checkout.
  37   -H, --hostonly          Host-Only mode: Install only what is needed for
  38                          booting the local host instead of a generic host.
  39   -i, --include [SOURCE] [TARGET]
  40                         Include the files in the SOURCE directory into the
  41                          Target directory in the final initramfs.
  42   -I, --install [LIST]  Install the space separated list of files into the
  43                          initramfs.
  44 "
  45 }
  46
  47 while (($# > 0)); do
  48     case $1 in
  49         -f|--force) force=yes;;
  50         -m|--modules) dracutmodules_l="$2"; shift;;
  51         -o|--omit) omit_dracutmodules_l="$2"; shift;;
  52         -a|--add) add_dracutmodules_l="$2"; shift;;
  53         -d|--drivers) drivers_l="$2"; shift;;
  54         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  55         --fwdir) fw_dir_l="$2"; shift;;
  56         -h|--help) usage; exit 1 ;;
  57         --debug) debug="yes";;
  58         -v|--verbose) beverbose="yes";;
  59         -c|--conf) conffile="$2"; shift;;
  60         -l|--local) allowlocal="yes" ;;
  61         -H|--hostonly) hostonly="-h" ;;
  62         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
  63         -I|--install) install_items="$2"; shift;;
  64         *) break ;;
  65     esac
  66     shift
  67 done
  68
  69 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH
  70
  71 [[ $debug ]] && {
  72     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
  73     set -x
  74 }
  75
  76 # if we were not passed a config file, try the default one
  77 [[ ! -f $conffile ]] && conffile="/etc/dracut.conf"
  78
  79 # source our config file
  80 [[ -f $conffile ]] && . "$conffile"
  81
  82 # these options override the stuff in the config file
  83 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
  84 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
  85 [[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
  86 [[ $drivers_l ]] && drivers=$drivers_l
  87 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
  88 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
  89 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
  90
  91 [[ $allowlocal && -f "$(dirname $0)/dracut-functions" ]] && dsrc="$(dirname $0)" || dsrc=$dracutbasedir
  92
  93 if [[ -f $dsrc/dracut-functions ]]; then
  94    . $dsrc/dracut-functions
  95 else
  96    echo "Cannot find $dsrc/dracut-functions. Are you running from a git checkout?"
  97    echo "Try passing -l as an argument to $0"
  98    exit 1
  99 fi
 100
 101 dracutfunctions=$dsrc/dracut-functions
 102 export dracutfunctions
 103
 104 # This is kinda legacy -- eventually it should go away.
 105 case $dracutmodules in
 106     ""|auto) dracutmodules="all" ;;
 107 esac
 108
 109 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 110 [[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initrd-$kernel.img"
 111
 112 if [[ -f $outfile && ! $force ]]; then
 113     echo "Will not override existing initramfs ($outfile) without --force"
 114     exit 1
 115 fi
 116
 117 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 118
 119 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 120 trap 'rm -rf "$initdir"' 0 # clean up after ourselves no matter how we die.
 121
 122 # Need to be able to have non-root users read stuff (rpcbind etc)
 123 chmod 755 "$initdir"
 124
 125 export initdir hookdirs dsrc dracutmodules drivers \
 126     fw_dir drivers_dir debug beverbose
 127
 128 # Create some directory structure first
 129 for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 130     mkdir -p "$initdir/$d";
 131 done
 132
 133 # check all our modules to see if they should be sourced.
 134 # This builds a list of modules that we will install next.
 135 check_modules
 136
 137 #source our modules.
 138 for moddir in "$dsrc/modules.d"/[0-9][0-9]*; do
 139     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 140     if strstr "$mods_to_load" " $mod "; then
 141         . "$moddir/install"
 142         mods_to_load=${mods_to_load// $mod /}
 143     fi
 144 done
 145 unset moddir
 146 echo $mods_to_load
 147
 148 ## final stuff that has to happen
 149
 150 # generate module dependencies for the initrd
 151 if [ -d "$initdir/lib/modules/$kernel" ]; then
 152     if ! depmod -a -b "$initdir" $kernel; then
 153         echo "\"depmod -a $kernel\" failed."
 154         exit 1
 155     fi
 156 fi
 157
 158 # make sure that library links are correct and up to date
 159 ldconfig -n -r "$initdir" /lib* /usr/lib*
 160
 161 if [[ $include_src && $include_target ]]; then
 162     mkdir -p "$initdir$include_target"
 163     cp -a -t "$initdir$include_target" "$include_src"/*
 164 fi
 165
 166 for item in $install_items; do
 167    dracut_install "$item"
 168 done
 169 unset item
 170
 171 [[ "$beverbose" = "yes" ]] && (du -c "$initdir" | sort -n)
 172
 173 ( cd "$initdir"; find . |cpio -H newc -o |gzip -9 > "$outfile"; )
 174
 175 [[ "$beverbose" = "yes" ]] && ls -lh "$outfile"
 176
 177 exit 0
 178