creation

this shell script allows to create a node-dependant ISO image

diff --git a/cdcustom.sh b/cdcustom.sh
new file mode 100755 (executable)
index 0000000..2e8448c
--- /dev/null
+++ b/cdcustom.sh
@@ -0,0 +1,124 @@
+#!/bin/bash
+
+# purpose : create a node-specific CD ISO image
+
+# given a CD ISO image, and a node-specific config file, this command
+# creates a new almost identical ISO image with the config file
+# embedded as boot/plnode.txt 
+
+set -e 
+COMMAND=$(basename $0)
+
+function usage () {
+
+   echo "Usage: $0 generic-iso node-config"
+   echo "Creates a node-specific ISO image"
+   echo "with the node-specific config file embedded as /boot/plnode.txt"
+   exit 1
+}
+
+### read config file in a subshell and echoes host_name
+function host_name () {
+  export CONFIG=$1; shift
+  ( . $CONFIG ; echo $HOST_NAME )
+}
+
+function cleanup () {
+   echo "Unmounting"
+   umount $ISOINROOT
+   echo "Cleaning mount-point"
+   rmdir $ISOINROOT
+}
+
+function abort () {
+   echo "Cleaning $ISOOUT"
+   rm -f $ISOOUT
+   cleanup
+}
+
+function main () {
+
+   [[ -n "$TRACE" ]] && set -x
+
+   [[ -z "$@" ]] && usage
+   ISOIN=$1; shift
+   [[ -z "$@" ]] && usage
+   NODECONF=$1; shift
+   [[ -n "$@" ]] && usage
+
+   NODENAME=$(host_name $NODECONF)
+   if [ -z "$NODENAME" ] ; then
+     echo "HOST_NAME not found in $NODECONF - exiting"
+     exit 1
+   fi
+   
+   ISODIR=$(dirname "$ISOIN")
+   ISOOUT=$ISODIR/$NODENAME.iso
+   ISOLOG=$ISODIR/$NODENAME.log
+
+
+   ### temporary mount point
+   ISOINROOT=$(basename $ISOIN .iso)
+
+   ### checking
+   if [ ! -f $ISOIN ] ; then
+     echo "Could not find template ISO image - exiting" ; exit 1
+   fi
+   if [ ! -f $NODECONF ] ; then
+     echo "Could not find node-specifig config - exiting" ; exit 1
+   fi
+   if [ -e "$ISOINROOT" ] ; then
+     echo "Temporary mount point $ISOINROOT exists, please clean up first - exiting" ; exit 1
+   fi
+   if [ -e  "$ISOOUT" ] ; then
+     echo "$ISOOUT exists, please remove first - exiting" ; exit 1
+   fi
+
+   ### summary
+   echo -e "Generic ISO image:\r\t\t\t$ISOIN"
+   echo -e "Node-specific config:\r\t\t\t$NODECONF"
+   echo -e "Node-specific ISO:\r\t\t\t$ISOOUT"
+   echo -e "Temporary mount-point:\r\t\t\t$ISOINROOT"
+
+   echo -ne "OK ? "
+   read answer
+
+   echo -n "Creating mount-point "
+   mkdir -p $ISOINROOT
+   echo Done
+
+   echo -n "Mounting generic image "
+   mount -o ro,loop $ISOIN $ISOINROOT 
+   echo Done
+
+   ### mkisofs needs to have write access on the boot image passed with -b
+   ### and we cannot use the same name as isolinux.bin either, so we change it to isolinux
+   ### the good news is that this way we can check we start from a fresh image
+
+   if [ -e $ISOINROOT/isolinux/isolinux ] ; then
+     echo "$ISOIN already contains isolinux/isolinux"
+     echo "It looks like this is not a first-hand image - exiting"
+     cleanup
+     exit 1
+   fi
+
+   echo -n "Copying isolinux.bin in /tmp/isolinux "
+   cp $ISOINROOT/isolinux/isolinux.bin /tmp/isolinux
+   echo Done
+
+   echo -n "Writing custom image ... "
+   trap abort int hup quit err
+   mkisofs -o $ISOOUT -R -allow-leading-dots -J -r -b isolinux/isolinux \
+   -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \
+   --graft-points $ISOINROOT isolinux/isolinux=/tmp/isolinux boot/plnode.txt=$NODECONF > $ISOLOG 2>&1
+   trap - int hup quit 
+   echo Done
+   
+   cleanup
+
+   echo "CD ISO image for $NODENAME in $ISOOUT"
+
+}
+
+####################
+main "$@"