build_usb_boot.sh

build_usb_boot.sh

#!/bin/bash -e

Create a syslinux boot environment

build_usb_boot.sh destdev

Assumes syslinux is installed Needs to run as root


DEST_DIR=${1:-/tmp/syslinux-boot}
PXEDIR=${PXEDIR:-/opt/ramstack/pxe}

Clean up any resources that may be in use

cleanup() {
    set +o errexit

Mop up temporary files

    if [ -n "$DEST_DEV" ]; then
        umount $DEST_DIR
        rmdir $DEST_DIR
    fi
    if [ -n "$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`

if [ -b $DEST_DIR ]; then

We have a block device, install syslinux and mount it

    DEST_DEV=$DEST_DIR
    DEST_DIR=`mktemp -d --tmpdir mntXXXXXX`
    mount $DEST_DEV $DEST_DIR

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

Install syslinux on the device

    syslinux --install --directory syslinux $DEST_DEV
else

We have a directory (for sanity checking output)

    DEST_DEV=""
    if [ ! -d $DEST_DIR/syslinux ]; then
        mkdir -p $DEST_DIR/syslinux
    fi
fi

Get some more stuff from syslinux

for i in memdisk menu.c32; do
    cp -pu /usr/lib/syslinux/$i $DEST_DIR/syslinux
done

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

MENU TITLE devstack 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
    $TOOLS_DIR/build_uec_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 $MNTDIR
        if [ -n "$DEST_DEV" ]; then
            umount $DEST_DIR
            rmdir $DEST_DIR
        fi
        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

if [ -n "$DEST_DEV" ]; then
    umount $DEST_DIR
    rmdir $DEST_DIR
fi

trap - SIGHUP SIGINT SIGTERM SIGQUIT EXIT