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         -h|--hostonly) hostonly="-h" ;;
  22         --skip-missing) skipmissing="yes" ;;
  23         *) break ;;
  24     esac
  25     shift
  26 done
  27
  28 [[ -f $conffile ]] || ( [[ -f /etc/dracut.conf ]] && conffile="/etc/dracut.conf" )
  29 [[ -f $conffile ]] && . "$conffile"
  30 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
  31 [[ $modules_l ]] && modules=$modules_l
  32
  33 [[ $allowlocal && -f dracut-functions ]] && dsrc="." || dsrc=/usr/lib/dracut
  34 . $dsrc/dracut-functions
  35 dracutfunctions=$dsrc/dracut-functions
  36 export dracutfunctions
  37
  38 [[ $dracutmodules ]] || dracutmodules="auto"
  39 [[ $dracutmodules = "auto" ]] && {
  40     dracutmodules="all"
  41     skipmissing="yes"
  42 }
  43 [[ $dracutmodules = "hostonly" ]] && {
  44     dracutmodules="all"
  45     skipmissing="yes"
  46     hostonly="-h"
  47 }
  48
  49
  50 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
  51 [[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initrd-$kernel.img"
  52
  53 if [[ -f $outfile && ! $force ]]; then
  54     echo "Will not override existing initramfs ($outfile) without --force"
  55     exit 1
  56 fi
  57
  58 hookdirs="pre-udev pre-mount pre-pivot mount"
  59
  60 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
  61 trap 'rm -rf "$initdir"' 0 # clean up after ourselves no matter how we die.
  62
  63 export initdir hookdirs dsrc dracutmodules modules
  64
  65 # Create some directory structure first
  66 for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot dev/pts; do
  67     mkdir -p "$initdir/$d";
  68 done
  69
  70 skip_missing() {
  71     # $1 = location of module
  72     [[ $skipmissing ]] || return 0
  73     [[ -x $1/check ]] || return 0
  74     "$1/check" $hostonly
  75 }
  76
  77 can_source_module() {
  78     # $1 = location of module
  79     mod=${1##*/}; mod=${mod#[0-9][0-9]};
  80     if [[ $dracutmodules != all ]]; then
  81         strstr "$dracutmodules " "$mod " || return 1
  82     fi
  83     skip_missing "$1"
  84 }
  85
  86 # source all our modules
  87 for moddir in "$dsrc/modules.d"/*; do
  88     [[ -d $moddir || -L $moddir ]] || continue
  89     can_source_module "$moddir" || continue
  90     [[ -x $moddir/install ]] && . "$moddir/install"
  91 done
  92 unset moddir
  93
  94 ## final stuff that has to happen
  95
  96 # generate module dependencies for the initrd
  97 /sbin/depmod -a -b "$initdir" $kernel || {
  98     echo "\"/sbin/depmod -a $kernel\" failed."
  99     exit 1
 100 }
 101
 102 # make sure that library links are correct and up to date
 103 ldconfig -n -r "$initdir" /lib* /usr/lib*
 104
 105 ( cd "$initdir"; find . |cpio -H newc -o |gzip -9 > "$outfile"; )