- refactored marc's kupdate.sh into a new script kvariant.sh

[bootcd.git] / kvariant.sh

diff --git a/kvariant.sh b/kvariant.sh
new file mode 100755 (executable)
index 0000000..f369d28
--- /dev/null
+++ b/kvariant.sh
@@ -0,0 +1,121 @@
+#!/bin/bash
+
+COMMAND=$(basename $0)
+
+function usage() {
+  echo "$COMMAND variant kernel-rpm"
+  echo "    Allows to create a variant of the bootcd image with a different kernel"
+  echo "    variant will be created under /usr/share/bootcd/<variant>"
+  echo "    with the same structure as the default /usr/share/bootcd/build"
+  echo "    the kernel rpm will also be stored in the variant dir for future reference"
+  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"
+  exit 1
+}
+
+function bail () {
+    rm -rf $tmpdir $files
+    exit -1
+}
+
+## locate rpm and store it in variant
+function getrpm () {
+    kernelrpm_url=$1; shift
+    kernelrpm_local=$1; shift
+    nocolon=$(echo $kernelrpm_url | sed -e s,:,,)
+    if [ "$kernelrpm_url" == "$nocolon" ] ; then
+       echo "Copying $kernelrpm_url in $variant_path"
+       cat $kernelrpm_url > $kernelrpm_local
+    else
+       echo "Fetching $kernelrpm_url in $variant_path"
+       curl -o $kernelrpm_local $kernelrpm_url
+    fi 
+}
+
+## sanity check
+function checkrpm () {
+    filename=$1
+    if [ -f "$filename" ] ; then
+       if [ $(rpm -qip $filename | wc -l) -eq 1 ] ; then
+           echo "$filename not a valid rpm file"
+           usage
+       fi
+    fi
+}
+
+######################################## let's go
+set -e
+
+[[ -z "$@" ]] && usage
+variant=$1; shift
+[[ -z "$@" ]] && usage
+kernelrpm_url=$1; shift
+[[ -n "$@" ]] && usage
+
+standard_path="/usr/share/bootcd/build"
+if [ ! -d $standard_path ] ; then
+    echo "Cound not find standard image $standard_path - exiting"
+    exit 1
+fi
+
+variant_path=/usr/share/bootcd/$variant
+if [ -e $variant_path ] ; then
+    echo "Found $variant_path - please remove first - exiting"
+    exit 1
+fi
+
+here=$(pwd)
+mkdir $variant_path
+echo "Creating $variant_path from $standard_path"
+tar -C $standard_path -cf - . | tar -C $variant_path -xf - 
+
+kernelrpm=$variant_path/$(basename $kernelrpm_url)
+getrpm $kernelrpm_url $kernelrpm
+checkrpm $kernelrpm
+
+isofsdir=$variant_path/isofs
+
+tmpdir=
+files=
+
+tmpdir=$(mktemp -d /var/tmp/bootcd.XXXXXX)
+trap "bail" ERR INT
+echo "Updating bootcd image with $kernelrpm"
+mkdir $tmpdir/bootcd
+pushd $tmpdir/bootcd
+echo "Unwrapping bootcd.img in $(pwd)"
+gzip -d -c $isofsdir/bootcd.img | cpio -diu
+echo "Cleaning up older kernel"
+rm -rf boot/*
+rm -rf lib/modules
+echo "Replacing with new kernel"
+rpm2cpio  $kernelrpm | cpio -diu
+echo "Running depmod"
+version=$(cd ./boot && ls vmlinuz* | sed 's,vmlinuz-,,')
+depmod -b . $version
+echo "Exposing kernel"
+cp boot/vmlinuz* ${tmpdir}/kernel
+echo "Wrapping new bootcd.img"
+find . | cpio --quiet -c -o | gzip -9 > ${tmpdir}/bootcd.img
+popd
+
+#
+echo -n "Preserving in $isofsdir .."
+mv ${isofsdir}/kernel ${tmpdir}/kernel.orig
+echo -n " kernel"
+mv ${isofsdir}/bootcd.img ${tmpdir}/bootcd.img.orig
+echo -n " bootcd.img"
+echo ""
+
+#
+echo -n "Populating $isofsdir .."
+mv ${tmpdir}/kernel ${isofsdir}/kernel
+echo -n " kernel"
+mv ${tmpdir}/bootcd.img ${isofsdir}/bootcd.img
+echo -n " bootcd.img"
+echo ""
+
+rm -rf $tmpdir
+
+echo "new variant $variant ready"
+trap - ERR
+exit 0