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