build_pxe_env.sh

build_pxe_env.sh

#!/bin/bash -e

Create a PXE boot environment

build_pxe_env.sh destdir

Requires Ubuntu Oneiric

Only needs to run as root if the destdir permissions require it


dpkg -l syslinux || apt-get install -y syslinux

DEST_DIR=${1:-/tmp}/tftpboot
PXEDIR=${PXEDIR:-/opt/ramstack/pxe}
PROGDIR=`dirname $0`

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 SIGQUIT EXIT

Keep track of the current directory

TOOLS_DIR=$(cd $(dirname "$0") && pwd)
TOP_DIR=`cd $TOOLS_DIR/..; pwd`

mkdir -p $DEST_DIR/pxelinux.cfg
cd $DEST_DIR
for i in memdisk menu.c32 pxelinux.0; do
    cp -pu /usr/lib/syslinux/$i $DEST_DIR
done

CFG=$DEST_DIR/pxelinux.cfg/default
cat >$CFG <<EOF
default menu.c32
prompt 0
timeout 0

MENU TITLE devstack PXE Boot Menu

EOF

Setup devstack boot

mkdir -p $DEST_DIR/ubuntu
if [ ! -d $PXEDIR ]; then
    mkdir -p $PXEDIR
fi

Get image into place

if [ ! -r $PXEDIR/stack-initrd.img ]; then
    cd $TOP_DIR
    $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
        echo "No kernel found"
        umount $MNTDIR
        rmdir $MNTDIR
        exit 1
    else
        cp -pu $MNTDIR/boot/vmlinuz-*-generic $PXEDIR
    fi
    umount $MNTDIR
    rmdir $MNTDIR
fi

Get generic kernel version

KNAME=`basename $PXEDIR/vmlinuz-*-generic`
KVER=${KNAME#vmlinuz-}
cp -pu $PXEDIR/vmlinuz-$KVER $DEST_DIR/ubuntu
cat >>$CFG <<EOF

LABEL devstack
    MENU LABEL ^devstack
    MENU DEFAULT
    KERNEL ubuntu/vmlinuz-$KVER
    APPEND initrd=ubuntu/stack-initrd.gz ramdisk_size=2109600 root=/dev/ram0
EOF

Get Ubuntu

if [ -d $PXEDIR -a -r $PXEDIR/natty-base-initrd.gz ]; then
    cp -pu $PXEDIR/natty-base-initrd.gz $DEST_DIR/ubuntu
    cat >>$CFG <<EOF

LABEL ubuntu
    MENU LABEL ^Ubuntu Natty
    KERNEL ubuntu/vmlinuz-$KVER
    APPEND initrd=ubuntu/natty-base-initrd.gz ramdisk_size=419600 root=/dev/ram0
EOF
fi

Local disk boot

cat >>$CFG <<EOF

LABEL local
    MENU LABEL ^Local disk
    LOCALBOOT 0
EOF

trap cleanup SIGHUP SIGINT SIGTERM SIGQUIT EXIT