lsinitrd.sh

   1 #!/bin/bash
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4 #
   5 # Copyright 2005-2010 Harald Hoyer <harald@redhat.com>
   6 # Copyright 2005-2010 Red Hat, Inc.  All rights reserved.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 usage()
  23 {
  24     {
  25         echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]"
  26         echo "Usage: ${0##*/} [options] -k <kernel version>"
  27         echo
  28         echo "-h, --help                  print a help message and exit."
  29         echo "-s, --size                  sort the contents of the initramfs by size."
  30         echo "-f, --file <filename>       print the contents of <filename>."
  31         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  32         echo
  33     } >&2
  34 }
  35
  36 sorted=0
  37 declare -A filenames
  38
  39 unset POSIXLY_CORRECT
  40 TEMP=$(getopt \
  41     -o "shf:k:" \
  42     --long kver: \
  43     --long file: \
  44     --long help \
  45     --long size \
  46     -- "$@")
  47
  48 if (( $? != 0 )); then
  49     usage
  50     exit 1
  51 fi
  52
  53 eval set -- "$TEMP"
  54
  55 while (($# > 0)); do
  56     case $1 in
  57         -k|--kver)  KERNEL_VERSION="$2"; shift;;
  58         -f|--file)  filenames[${2#/}]=1; shift;;
  59         -s|--size)  sorted=1;;
  60         -h|--help)  usage; exit 0;;
  61         --)         shift;break;;
  62         *)          usage; exit 1;;
  63     esac
  64     shift
  65 done
  66
  67 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  68
  69 if [[ $1 ]]; then
  70     image="$1"
  71     if ! [[ -f "$image" ]]; then
  72         {
  73             echo "$image does not exist"
  74             echo
  75         } >&2
  76         usage
  77         exit 1
  78     fi
  79 else
  80     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  81
  82     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  83         && [[ $MACHINE_ID ]] \
  84         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
  85         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  86     else
  87         image="/boot/initramfs-${KERNEL_VERSION}.img"
  88     fi
  89 fi
  90
  91 shift
  92 while (($# > 0)); do
  93     filenames[${1#/}]=1;
  94     shift
  95 done
  96
  97 if ! [[ -f "$image" ]]; then
  98     {
  99         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 100         echo
 101     } >&2
 102     usage
 103     exit 1
 104 fi
 105
 106 read -N 6 bin < "$image"
 107 case $bin in
 108     $'\x1f\x8b'*)
 109         CAT="zcat";;
 110     BZh*)
 111         CAT="bzcat";;
 112     070701)
 113         CAT="cat";;
 114     *)
 115         CAT="xzcat";
 116         if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 117             CAT="xzcat --single-stream"
 118         fi
 119         ;;
 120 esac
 121
 122 ret=0
 123
 124 if (( ${#filenames[@]} > 0 )); then
 125     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 126     for f in ${!filenames[@]}; do
 127         [[ $nofileinfo ]] || echo "initramfs:/$f"
 128         [[ $nofileinfo ]] || echo "========================================================================"
 129         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 130         ((ret+=$?))
 131         [[ $nofileinfo ]] || echo "========================================================================"
 132         [[ $nofileinfo ]] || echo
 133     done
 134 else
 135     echo "Image: $image: $(du -h $image | while read a b; do echo $a;done)"
 136     echo "========================================================================"
 137     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout '*lib/dracut/dracut-*' 2>/dev/null)
 138     ((ret+=$?))
 139     echo "$version with dracut modules:"
 140     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout 'usr/lib/dracut/modules.txt' 2>/dev/null
 141     ((ret+=$?))
 142     echo "========================================================================"
 143     if [ "$sorted" -eq 1 ]; then
 144         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 145     else
 146         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 147     fi
 148     ((ret+=$?))
 149     echo "========================================================================"
 150 fi
 151
 152 exit $ret