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=$1; shift
  52 [[ -n "$@" ]] && usage
  53
  54 basedir=$(cd -P $(dirname $0); pwd)
  55 standard_path="$basedir/build"
  56 if [ ! -d $standard_path ] ; then
  57     echo "Cound not find standard image $standard_path - exiting"
  58     exit 1
  59 fi
  60
  61 variant_path="$basedir/$variant"
  62 if [ -e $variant_path ] ; then
  63     echo "Found $variant_path - please remove first - exiting"
  64     exit 1
  65 fi
  66
  67 here=$(pwd)
  68 mkdir $variant_path
  69 echo "Creating $variant_path from $standard_path"
  70 tar -C $standard_path -cf - . | tar -C $variant_path -xf -
  71
  72 kernelrpm=$variant_path/$(basename $kernelrpm_url)
  73 getrpm $kernelrpm_url $kernelrpm
  74 checkrpm $kernelrpm
  75
  76 if echo ${kernelrpm} | grep -q kernel-2.6.32 ; then
  77     extrarpm_url=`echo $kernelrpm_url | sed -e "s:kernel-2.6.32:kernel-firmware-2.6.32:g"`
  78     extrarpm=$variant_path/$(basename $extrarpm_url)
  79     getrpm $extrarpm_url $extrarpm
  80     checkrpm $extrarpm
  81 fi
  82
  83 isofsdir=$variant_path/isofs
  84
  85 tmpdir=
  86 files=
  87
  88 tmpdir=$(mktemp -d /var/tmp/bootcd.XXXXXX)
  89 trap "bail" ERR INT
  90 echo "Updating bootcd image with $kernelrpm"
  91 mkdir $tmpdir/bootcd
  92 pushd $tmpdir/bootcd
  93 echo "Unwrapping bootcd.img in $(pwd)"
  94 gzip -d -c $isofsdir/bootcd.img | cpio -diu
  95 echo "Cleaning up older kernel"
  96 rm -rf boot/*
  97 rm -rf lib/modules
  98 echo "Replacing with new kernel"
  99 rpm2cpio  $kernelrpm | cpio -diu
 100 if [ -n $"extrarpm_url" ] ; then
 101     echo "Unpacking $extrarpm"
 102     rpm2cpio  $extrarpm | cpio -diu
 103 fi
 104 echo "Running depmod"
 105 version=$(cd ./boot && ls vmlinuz* | sed 's,vmlinuz-,,')
 106 depmod -b . $version
 107 echo "Exposing kernel"
 108 cp boot/vmlinuz* ${tmpdir}/kernel
 109 echo "Wrapping new bootcd.img"
 110 find . | cpio --quiet -c -o | gzip -9 > ${tmpdir}/bootcd.img
 111 popd
 112
 113 #
 114 echo -n "Preserving in $isofsdir .."
 115 mv ${isofsdir}/kernel ${tmpdir}/kernel.orig
 116 echo -n " kernel"
 117 mv ${isofsdir}/bootcd.img ${tmpdir}/bootcd.img.orig
 118 echo -n " bootcd.img"
 119 echo ""
 120
 121 #
 122 echo -n "Populating $isofsdir .."
 123 mv ${tmpdir}/kernel ${isofsdir}/kernel
 124 echo -n " kernel"
 125 mv ${tmpdir}/bootcd.img ${isofsdir}/bootcd.img
 126 echo -n " bootcd.img"
 127 echo ""
 128
 129 rm -rf $tmpdir $kernelrpm $extrarpm
 130
 131 echo "new variant $variant ready"
 132 trap - ERR
 133 exit 0