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