devstack_custom/tools/build_pxe_boot.sh

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#!/bin/bash -e
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# build_pxe_boot.sh - Create a PXE boot environment
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#
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# build_pxe_boot.sh destdir
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#
# Assumes syslinux is installed
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# Only needs to run as root if the destdir permissions require it
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DEST_DIR=${1:-/tmp}/tftpboot
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PXEDIR=${PXEDIR:-/var/cache/devstack/pxe}
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OPWD=`pwd`
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PROGDIR=`dirname $0`
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# Clean up any resources that may be in use
cleanup() {
set +o errexit
# Mop up temporary files
if [ -n "$MNTDIR" -a -d "$MNTDIR" ]; then
umount $MNTDIR
rmdir $MNTDIR
fi
# Kill ourselves to signal any calling process
trap 2; kill -2 $$
}
trap cleanup SIGHUP SIGINT SIGTERM
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mkdir -p $DEST_DIR/pxelinux.cfg
cd $DEST_DIR
for i in memdisk menu.c32 pxelinux.0; do
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cp -pu /usr/lib/syslinux/$i $DEST_DIR
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done
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CFG=$DEST_DIR/pxelinux.cfg/default
cat >$CFG <<EOF
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default menu.c32
prompt 0
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timeout 0
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MENU TITLE PXE Boot Menu
EOF
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# Setup devstack boot
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mkdir -p $DEST_DIR/ubuntu
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if [ ! -d $PXEDIR ]; then
mkdir -p $PXEDIR
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fi
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# Get image into place
if [ ! -r $PXEDIR/stack-initrd.img ]; then
cd $OPWD
$PROGDIR/build_ramdisk.sh $PXEDIR/stack-initrd.img
fi
if [ ! -r $PXEDIR/stack-initrd.gz ]; then
gzip -1 -c $PXEDIR/stack-initrd.img >$PXEDIR/stack-initrd.gz
fi
cp -pu $PXEDIR/stack-initrd.gz $DEST_DIR/ubuntu
if [ ! -r $PXEDIR/vmlinuz-*-generic ]; then
MNTDIR=`mktemp -d --tmpdir mntXXXXXXXX`
mount -t ext4 -o loop $PXEDIR/stack-initrd.img $MNTDIR
if [ ! -r $MNTDIR/boot/vmlinuz-*-generic ]; then
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echo "No kernel found"
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umount $MNTDIR
rmdir $MNTDIR
exit 1
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else
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cp -pu $MNTDIR/boot/vmlinuz-*-generic $PXEDIR
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fi
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umount $MNTDIR
rmdir $MNTDIR
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fi
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# Get generic kernel version
KNAME=`basename $PXEDIR/vmlinuz-*-generic`
KVER=${KNAME#vmlinuz-}
cp -pu $PXEDIR/vmlinuz-$KVER $DEST_DIR/ubuntu
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cat >>$CFG <<EOF
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LABEL devstack
MENU LABEL ^devstack
MENU DEFAULT
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KERNEL ubuntu/vmlinuz-$KVER
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APPEND initrd=ubuntu/stack-initrd.gz ramdisk_size=2109600 root=/dev/ram0
EOF
# Get Ubuntu
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if [ -d $PXEDIR -a -r $PXEDIR/natty-base-initrd.gz ]; then
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cp -pu $PXEDIR/natty-base-initrd.gz $DEST_DIR/ubuntu
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cat >>$CFG <<EOF
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LABEL ubuntu
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MENU LABEL ^Ubuntu Natty
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KERNEL ubuntu/vmlinuz-$KVER
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APPEND initrd=ubuntu/natty-base-initrd.gz ramdisk_size=419600 root=/dev/ram0
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EOF
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fi
# Local disk boot
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cat >>$CFG <<EOF
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LABEL local
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MENU LABEL ^Local disk
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LOCALBOOT 0
EOF