#!/bin/sh
#
#  If the pygrub flag is set, this script will install the necessary
# packages to boot the VM from the dom0 via pygrub. This script installs
# the kernel and modules and generates a grub menu.lst in the newly
# created maschine.
#
# Dmitry Nedospasov
# --
# http://nedos.net

prefix=$1

#
#  Source our common functions
#

if [ -e /usr/share/xen-tools/common.sh ]; then
    . /usr/share/xen-tools/common.sh
else
    . ./hooks/common.sh
fi

if [ "${pygrub}" ]; then
#
# Log our start
#

logMessage Script $0 starting

#
# Resolve the correct architecture
#

if [ "${arch}" = "i386" ]; then
    XEN_ARCH="686"
elif [ "${arch}" = "amd64" ]; then
    XEN_ARCH="amd64"
elif [ -z "${arch}" ]; then
    UNAME_ARCH=`uname -m`
    if [ "${UNAME_ARCH}" = "i686" ]; then
        XEN_ARCH="686"
    elif [ "${UNAME_ARCH}" = "x86_64" ]; then
        XEN_ARCH="amd64"
    else
        logMessage Unknown kernel architecture ${UNAME_ARCH}.
        logMessage Please report this as bug to xen-tools-dev@xen-tools.org.
        logMessage Script $0 failed
        exit 1
    fi
else
    logMessage Unknown kernel architecture ${arch}
    logMessage Script $0 failed
    exit 1
fi

#
# Attempt to install a xen kernel, if that fails, then install a normal one
#

KERNEL_XEN_PKG="linux-image-xen-$XEN_ARCH"
KERNEL_PKG="linux-image-$XEN_ARCH"

# Add "-pae" suffix for Debian releases after Squeeze. See
# https://bugs.debian.org/742778 for details.
if [ "${dist}" != "sarge"   -a \
     "${dist}" != "etch"    -a \
     "${dist}" != "lenny"   -a \
     "${dist}" != "squeeze" -a \
     "$XEN_ARCH" = "686" ]; then
    KERNEL_XEN_PKG="$KERNEL_XEN_PKG-pae"
    KERNEL_PKG="$KERNEL_PKG-pae"
fi

logMessage Attempting to install the $KERNEL_XEN_PKG kernel image
if chroot ${prefix} /usr/bin/apt-cache show $KERNEL_XEN_PKG > /dev/null 2>&1; then
    logMessage Package $KERNEL_XEN_PKG is available - installing
    installDebianPackage ${prefix} initramfs-tools
    installDebianPackage ${prefix} $KERNEL_XEN_PKG

else
    logMessage Package $KERNEL_XEN_PKG is not available
    logMessage Attempting to install the $KERNEL_PKG kernel image
    logMessage WARNING: This kernel may not have pvops
    if chroot ${prefix} /usr/bin/apt-cache show $KERNEL_PKG > /dev/null 2>&1; then
        logMessage Package $KERNEL_PKG is available - installing
        installDebianPackage ${prefix} initramfs-tools
        installDebianPackage ${prefix} $KERNEL_PKG
    else
        logMessage Package $KERNEL_PKG is not available
        logMessage pygrub set, but kernel could not be installed
        logMessage Script $0 failed
        exit 1
    fi
fi

# Check for "ls -v" support
V=''; if ls -1 ${prefix}/boot/vmlinuz* > /dev/null 2>&1; then V=-v; fi

DOMU_KERNEL=$(basename $(ls -1 ${V} ${prefix}/boot/vmlinuz* | tail -n 1))
KERNEL_REV=$(echo $DOMU_KERNEL | sed "s/vmlinuz-//g")
DOMU_RAMDISK="initrd.img-$KERNEL_REV"
DOMU_ISSUE=$(sed -re "s/ *\\\.*//g" -e1q < ${prefix}/etc/issue)

#
# Generate initrd if it does not exist
#

if [ -f ${prefix}/boot/$DOMU_RAMDISK ]; then
    logMessage initrd exists, skipping generation
else
    logMessage initrd missing, generating
    chroot ${prefix} update-initramfs -c -k $KERNEL_REV
fi

#
# Generate a menu.lst for pygrub
#

generateDebianGrubMenuLst "${prefix}" "$DOMU_ISSUE" "$DOMU_KERNEL" "$DOMU_RAMDISK"


else
    logMessage pygrub not set, skipping kernel install
fi # if pygrub

#
#  Log our finish
#

logMessage Script $0 finished