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
  26                         modules
  27   --fwdir [DIR]         Specify additional directories, where to look for
  28                         firmwares, separated by :
  29   --kernel-only         Only install kernel drivers and firmware files
  30   --no-kernel           Do not install kernel drivers and firmware files
  31   -h, --help            This message
  32   --debug               Output debug information of the build process
  33   -v, --verbose         Verbose output during the build process
  34   -c, --conf [FILE]     Specify configuration file to use.
  35                          Default: /etc/dracut.conf
  36   -l, --local           Local mode. Use modules from the current working
  37                          directory instead of the system-wide installed in
  38                          /usr/share/dracut/modules.d.
  39                          Useful when running dracut from a git checkout.
  40   -H, --hostonly          Host-Only mode: Install only what is needed for
  41                          booting the local host instead of a generic host.
  42   -i, --include [SOURCE] [TARGET]
  43                         Include the files in the SOURCE directory into the
  44                          Target directory in the final initramfs.
  45   -I, --install [LIST]  Install the space separated list of files into the
  46                          initramfs.
  47 "
  48 }
  49
  50 while (($# > 0)); do
  51     case $1 in
  52         -f|--force) force=yes;;
  53         -m|--modules) dracutmodules_l="$2"; shift;;
  54         -o|--omit) omit_dracutmodules_l="$2"; shift;;
  55         -a|--add) add_dracutmodules_l="$2"; shift;;
  56         -d|--drivers) drivers_l="$2"; shift;;
  57         -k|--kmoddir) drivers_dir_l="$2"; shift;;
  58         --fwdir) fw_dir_l="$2"; shift;;
  59         --kernel-only) kernel_only="yes"; nokernel="no";;
  60         --no-kernel) kernel_only="no"; no_kernel="yes";;
  61         -h|--help) usage; exit 1 ;;
  62         --debug) debug="yes";;
  63         -v|--verbose) beverbose="yes";;
  64         -c|--conf) conffile="$2"; shift;;
  65         -l|--local) allowlocal="yes" ;;
  66         -H|--hostonly) hostonly="-h" ;;
  67         -i|--include) include_src="$2"; include_target="$3"; shift 2;;
  68         -I|--install) install_items="$2"; shift;;
  69         -*) printf "\nUnknown option: %s\n\n" "$1" >&2; usage; exit 1;;
  70         *) break ;;
  71     esac
  72     shift
  73 done
  74
  75 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH
  76
  77 [[ $debug ]] && {
  78     export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
  79     set -x
  80 }
  81
  82 # if we were not passed a config file, try the default one
  83 [[ ! -f $conffile ]] && conffile="/etc/dracut.conf"
  84
  85 # source our config file
  86 [[ -f $conffile ]] && . "$conffile"
  87
  88 # these options override the stuff in the config file
  89 [[ $dracutmodules_l ]] && dracutmodules=$dracutmodules_l
  90 [[ $omit_dracutmodules_l ]] && omit_dracutmodules=$omit_dracutmodules_l
  91 [[ $add_dracutmodules_l ]] && add_dracutmodules="$add_dracutmodules $add_dracutmodules_l"
  92 [[ $drivers_l ]] && drivers=$drivers_l
  93 [[ $drivers_dir_l ]] && drivers_dir=$drivers_dir_l
  94 [[ $fw_dir_l ]] && fw_dir=$fw_dir_l
  95 [[ $dracutbasedir ]] || dracutbasedir=/usr/share/dracut
  96 [[ $fw_dir ]] || fw_dir=/lib/firmware
  97
  98 [[ $allowlocal && -f "$(dirname $0)/dracut-functions" ]] && dsrc="$(dirname $0)" || dsrc=$dracutbasedir
  99
 100 if [[ -f $dsrc/dracut-functions ]]; then
 101    . $dsrc/dracut-functions
 102 else
 103    echo "Cannot find $dsrc/dracut-functions. Are you running from a git checkout?"
 104    echo "Try passing -l as an argument to $0"
 105    exit 1
 106 fi
 107
 108 dracutfunctions=$dsrc/dracut-functions
 109 export dracutfunctions
 110
 111 # This is kinda legacy -- eventually it should go away.
 112 case $dracutmodules in
 113     ""|auto) dracutmodules="all" ;;
 114 esac
 115
 116 [[ $2 ]] && kernel=$2 || kernel=$(uname -r)
 117 [[ $1 ]] && outfile=$(readlink -f $1) || outfile="/boot/initrd-$kernel.img"
 118
 119 srcmods="/lib/modules/$kernel/"
 120 [ -n "$drivers_dir" ] && srcmods="$drivers_dir"
 121 export srcmods
 122
 123 if [[ -f $outfile && ! $force ]]; then
 124     echo "Will not override existing initramfs ($outfile) without --force"
 125     exit 1
 126 fi
 127
 128 hookdirs="cmdline pre-udev pre-trigger netroot pre-mount pre-pivot mount emergency"
 129
 130 readonly initdir=$(mktemp -d -t initramfs.XXXXXX)
 131 trap 'rm -rf "$initdir"' 0 # clean up after ourselves no matter how we die.
 132
 133 # Need to be able to have non-root users read stuff (rpcbind etc)
 134 chmod 755 "$initdir"
 135
 136 export initdir hookdirs dsrc dracutmodules drivers \
 137     fw_dir drivers_dir debug beverbose no_kernel kernel_only
 138
 139 if [[ "$kernel_only" != "yes" ]]; then
 140     # Create some directory structure first
 141     for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot tmp dev/pts var/run; do
 142         mkdir -p "$initdir/$d";
 143     done
 144 fi
 145
 146 # check all our modules to see if they should be sourced.
 147 # This builds a list of modules that we will install next.
 148 check_modules
 149
 150 #source our modules.
 151 for moddir in "$dsrc/modules.d"/[0-9][0-9]*; do
 152     mod=${moddir##*/}; mod=${mod#[0-9][0-9]}
 153     if strstr "$mods_to_load" " $mod "; then
 154         if [[ "$kernel_only" = "yes" ]]; then
 155             [[ -x "$moddir/installkernel" ]] && . "$moddir/installkernel"
 156         else
 157             . "$moddir/install"
 158             if [[ "$no_kernel" != "yes" && -x "$moddir/installkernel" ]]; then
 159                 . "$moddir/installkernel"
 160             fi
 161         fi
 162         mods_to_load=${mods_to_load// $mod /}
 163     fi
 164 done
 165 unset moddir
 166 echo $mods_to_load
 167
 168 ## final stuff that has to happen
 169
 170 # generate module dependencies for the initrd
 171 if [ -d "$initdir/lib/modules/$kernel" ]; then
 172     if ! depmod -a -b "$initdir" $kernel; then
 173         echo "\"depmod -a $kernel\" failed."
 174         exit 1
 175     fi
 176 fi
 177
 178 # make sure that library links are correct and up to date
 179 ldconfig -n -r "$initdir" /lib* /usr/lib*
 180
 181 if [[ $include_src && $include_target ]]; then
 182     mkdir -p "$initdir$include_target"
 183     cp -a -t "$initdir$include_target" "$include_src"/*
 184 fi
 185
 186 for item in $install_items; do
 187    dracut_install "$item"
 188 done
 189 unset item
 190
 191 [[ "$beverbose" = "yes" ]] && (du -c "$initdir" | sort -n)
 192
 193 ( cd "$initdir"; find . |cpio -H newc -o |gzip -9 > "$outfile"; )
 194
 195 [[ "$beverbose" = "yes" ]] && ls -lh "$outfile"
 196
 197 exit 0
 198