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 while (($# > 0)); do
  12     case $1 in
  13         -f|--force) force=yes;;
  14         -m|--modules) dracutmodules_l="$2"; shift;;
  15         -d|--drivers) modules_l="$2"; shift;;
  16         -h|--help) echo "Usage: $0 [-f] <initramfs> <kernel-version>"
  17             exit 1 ;;
  18         -v|--verbose) set -x;;
  19         -c|--conf) conffile="$2"; shift;;
  20         -l|--local) allowlocal="yes" ;;
  21         --allow-missing) : ;;
  22         *) break ;;
  23     esac
  24     shift
  25 done
  26
  27 [[ -f $conffile ]] || [[ -f /etc/dracut.conf ]] && conffile="/etc/dracut.conf"
  28 [[ -f $conffile ]] && . "$conffile"
  29
  30 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodule_l
  31 [[ $modules_l ]] && modules=$modules_l
  32
  33 [[ $allowlocal && -f dracut-functions ]] && dsrc="." || dsrc=/usr/lib/dracut
  34 . $dsrc/dracut-functions
  35
  36 [[ $dracutmodules ]] || dracutmodules="all"
  37
  38 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
  39 [[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initrd-$kernel.img"
  40
  41 if [[ -f $outfile && ! $force ]]; then
  42     echo "Will not override existing initramfs ($outfile) without --force"
  43     exit 1
  44 fi
  45
  46 hookdirs="pre-udev pre-mount pre-pivot mount"
  47
  48 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
  49 trap 'rm -rf "$initdir"' 0 # clean up after ourselves no matter how we die.
  50
  51 export initdir hookdirs dsrc dracutmodules modules
  52
  53 # Create some directory structure first
  54 for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot dev/pts; do
  55     mkdir -p "$initdir/$d";
  56 done
  57
  58 can_source_module() {
  59     # $1 = location of module
  60     mod=${1##*/}; mod=${mod#[0-9][0-9]};
  61     case $dracutmodules in
  62         all) return 0;;
  63         auto) [[ -x $1/check ]] || return 0
  64             "$1/check" >/dev/null 2>&1 && return 0 ;;
  65         *) strstr "$dracutmodules" "$mod" && return 0;;
  66     esac
  67     return 1
  68 }
  69
  70 # source all our modules
  71 for moddir in "$dsrc/modules.d"/*; do
  72     [[ -d $moddir || -L $moddir ]] || continue
  73     can_source_module "$moddir" || continue
  74     [[ -x $moddir/install ]] && . "$moddir/install"
  75 done
  76 unset moddir
  77
  78 ## final stuff that has to happen
  79
  80 # generate module dependencies for the initrd
  81 /sbin/depmod -a -b "$initdir" $kernel || {
  82     echo "\"/sbin/depmod -a $kernel\" failed."
  83     exit 1
  84 }
  85
  86 # make sure that library links are correct and up to date
  87 ldconfig -n -r "$initdir" /lib* /usr/lib*
  88
  89 ( cd "$initdir"; find . |cpio -H newc -o |gzip -9 > "$outfile"; )