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