kvariant.sh

   1 #!/bin/bash
   2
   3 COMMAND=$(basename $0)
   4
   5 function usage() {
   6   echo "$COMMAND variant kernel-rpm"
   7   echo "    Allows to create a variant of the bootcd image with a different kernel"
   8   echo "    variant will be created under /usr/share/bootcd/<variant>"
   9   echo "    with the same structure as the default /usr/share/bootcd/build"
  10   echo "    the kernel rpm will also be stored in the variant dir for future reference"
  11   echo "e.g. $COMMAND centos5 http://mirror.onelab.eu/centos/5.2/updates/i386/RPMS/kernel-2.6.18-92.1.1.el5.i686.rpm"
  12   exit 1
  13 }
  14
  15 function bail () {
  16     rm -rf $tmpdir $files
  17     exit -1
  18 }
  19
  20 ## locate rpm and store it in variant
  21 function getrpm () {
  22     kernelrpm_url=$1; shift
  23     kernelrpm_local=$1; shift
  24     nocolon=$(echo $kernelrpm_url | sed -e s,:,,)
  25     if [ "$kernelrpm_url" == "$nocolon" ] ; then
  26         echo "Copying $kernelrpm_url in $variant_path"
  27         cat $kernelrpm_url > $kernelrpm_local
  28     else
  29         echo "Fetching $kernelrpm_url in $variant_path"
  30         curl -o $kernelrpm_local $kernelrpm_url
  31     fi
  32 }
  33
  34 ## sanity check
  35 function checkrpm () {
  36     filename=$1
  37     if [ -f "$filename" ] ; then
  38         if [ $(rpm -qip $filename | wc -l) -eq 1 ] ; then
  39             echo "$filename not a valid rpm file"
  40             usage
  41         fi
  42     fi
  43 }
  44
  45 ######################################## let's go
  46 set -e
  47
  48 [[ -z "$@" ]] && usage
  49 variant=$1; shift
  50 [[ -z "$@" ]] && usage
  51 kernelrpm_url=$1; shift
  52 if [[ -n "$@" ]] ; then
  53     extrarpm_url=$1; shift
  54 fi
  55 [[ -n "$@" ]] && usage
  56
  57 basedir=$(cd -P $(dirname $0); pwd)
  58 standard_path="$basedir/build"
  59 if [ ! -d $standard_path ] ; then
  60     echo "Cound not find standard image $standard_path - exiting"
  61     exit 1
  62 fi
  63
  64 variant_path="$basedir/$variant"
  65 if [ -e $variant_path ] ; then
  66     echo "Found $variant_path - please remove first - exiting"
  67     exit 1
  68 fi
  69
  70 here=$(pwd)
  71 mkdir $variant_path
  72 echo "Creating $variant_path from $standard_path"
  73 tar -C $standard_path -cf - . | tar -C $variant_path -xf -
  74
  75 kernelrpm=$variant_path/$(basename $kernelrpm_url)
  76 getrpm $kernelrpm_url $kernelrpm
  77 checkrpm $kernelrpm
  78
  79 if [ -n "$extrarpm_url" ] ; then
  80     extrarpm=$variant_path/$(basename $extrarpm_url)
  81     getrpm $extrarpm_url $extrarpm
  82     checkrpm $extrarpm
  83 fi
  84
  85 isofsdir=$variant_path/isofs
  86
  87 tmpdir=
  88 files=
  89
  90 tmpdir=$(mktemp -d /var/tmp/bootcd.XXXXXX)
  91 trap "bail" ERR INT
  92 echo "Updating bootcd image with $kernelrpm"
  93 mkdir $tmpdir/bootcd
  94 pushd $tmpdir/bootcd
  95 echo "Unwrapping bootcd.img in $(pwd)"
  96 gzip -d -c $isofsdir/bootcd.img | cpio -diu
  97 echo "Cleaning up older kernel"
  98 rm -rf boot/*
  99 rm -rf lib/modules
 100 echo "Replacing with new kernel"
 101 rpm2cpio  $kernelrpm | cpio -diu
 102 if [ -n $"extrarpm_url" ] ; then
 103     echo "Unpacking $extrarpm"
 104     rpm2cpio  $extrarpm | cpio -diu
 105 fi
 106 echo "Running depmod"
 107 version=$(cd ./boot && ls vmlinuz* | sed 's,vmlinuz-,,')
 108 depmod -b . $version
 109 echo "Exposing kernel"
 110 cp boot/vmlinuz* ${tmpdir}/kernel
 111 echo "Wrapping new bootcd.img"
 112 find . | cpio --quiet -c -o | gzip -9 > ${tmpdir}/bootcd.img
 113 popd
 114
 115 #
 116 echo -n "Preserving in $isofsdir .."
 117 mv ${isofsdir}/kernel ${tmpdir}/kernel.orig
 118 echo -n " kernel"
 119 mv ${isofsdir}/bootcd.img ${tmpdir}/bootcd.img.orig
 120 echo -n " bootcd.img"
 121 echo ""
 122
 123 #
 124 echo -n "Populating $isofsdir .."
 125 mv ${tmpdir}/kernel ${isofsdir}/kernel
 126 echo -n " kernel"
 127 mv ${tmpdir}/bootcd.img ${isofsdir}/bootcd.img
 128 echo -n " bootcd.img"
 129 echo ""
 130
 131 rm -rf $tmpdir $kernelrpm $extrarpm
 132
 133 echo "new variant $variant ready"
 134 trap - ERR
 135 exit 0