#
# XEN specific functions
#
################################################################
#
# Copyright (c) 1995-2014 SUSE Linux Products GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
################################################################

xen_set_xenid_xmcmd() {
    XENID="${VM_ROOT%/root}"
    XENID="${XENID%/tmpfs}"
    XENID="${XENID##*/}"
    XENID="${XENID#root_}"
    XMCMD=xm
    test ! -x /usr/sbin/xm -a -x /usr/sbin/xl && XMCMD=xl
}

vm_verify_options_xen() {
    vm_kernel=/boot/vmlinuz
    vm_initrd=/boot/initrd
    test -e /boot/vmlinuz-xen && vm_kernel=/boot/vmlinuz-xen
    test -e /boot/initrd-xen && vm_initrd=/boot/initrd-xen
    test -n "$VM_KERNEL" && vm_kernel="$VM_KERNEL"
    test -n "$VM_INITRD" && vm_initrd="$VM_INITRD"
    if test ! -x /usr/sbin/xm -a -x /usr/sbin/xl ; then
	VM_ROOTDEV=/dev/xvda
	VM_SWAPDEV=/dev/xvdb
	VM_CONSOLE=hvc0
    else
	VM_ROOTDEV=/dev/hda1
	VM_SWAPDEV=/dev/hda2
	VM_CONSOLE=ttyS0
    fi
}

vm_startup_xen() {
    xen_set_xenid_xmcmd
    XMROOT="file:$(readlink -f $VM_ROOT)"
    XMROOT=${XMROOT/#file:\/dev/phy:/dev}
    XMROOT="disk=$XMROOT,${VM_ROOTDEV#/dev/},w"
    XMSWAP=
    if test -n "$VM_SWAP" ; then
	XMSWAP="file:$(readlink -f $VM_SWAP)"
	XMSWAP=${XMSWAP/#file:\/dev/phy:/dev}
	XMSWAP="disk=$XMSWAP,${VM_SWAPDEV#/dev/},w"
    fi

    if $XMCMD list "build_$XENID" >/dev/null 2>&1 ; then
       echo "Instance already exists, something really went wrong..."
       echo "Please report to your server admin, there might be multiple services running for same domain"
       cleanup_and_exit 3
    fi
    XEN_CONF_FILE=`mktemp /var/tmp/build.xen.conf-XXXXXXXXX` || cleanup_and_exit 3
    
    echo "kernel = \"$vm_kernel\""                                           >  $XEN_CONF_FILE
    echo "ramdisk = \"$vm_initrd\""                                          >> $XEN_CONF_FILE
    echo "memory = ${VM_MEMSIZE:-64}"                                        >> $XEN_CONF_FILE
    test -n "$BUILD_JOBS" && echo "vcpus = $BUILD_JOBS"                      >> $XEN_CONF_FILE
    echo "root = \"$VM_ROOTDEV ro\""                                           >> $XEN_CONF_FILE
    echo "extra = \"init=/bin/bash console=$VM_CONSOLE panic=1 udev_timeout=360\"" >> $XEN_CONF_FILE
    echo "on_poweroff = \"destroy\""                                         >> $XEN_CONF_FILE
    echo "on_reboot = \"destroy\""                                           >> $XEN_CONF_FILE
    echo "on_crash = \"destroy\""                                            >> $XEN_CONF_FILE
    if test "$XMCMD" = xm ; then
	set -- xm create -c $XEN_CONF_FILE name="build_$XENID" $XMROOT $XMSWAP extra="panic=1 quiet init="$vm_init_script" rd.driver.pre=binfmt_misc elevator=noop console=$VM_CONSOLE"
    else
	XLDISK=
	XLDISK="\"${XMROOT#disk=}\""
	test -n "$XMSWAP" && XLDISK="$XLDISK, \"${XMSWAP#disk=}\""
	set -- xl create -c $XEN_CONF_FILE name="\"build_$XENID\"" "disk=[ $XLDISK ]" extra=\""panic=1 quiet init="$vm_init_script" rd.driver.pre=binfmt_misc $vm_linux_kernel_parameter elevator=noop console=$VM_CONSOLE"\"
    fi
    if test "$PERSONALITY" != 0 ; then
	# have to switch back to PER_LINUX to make xm work
	set -- linux64 "$@"
    fi
    echo "$@"
    "$@" || cleanup_and_exit 3
    rm -f "$XEN_CONF_FILE"
}

vm_kill_xen() {
    xen_set_xenid_xmcmd
    if $XMCMD list "build_$XENID" >/dev/null 2>&1 ; then 
	if ! $XMCMD destroy "build_$XENID" ; then 
	    cleanup_and_exit 1 "could not kill xen build $XENID"
	fi
    fi
}

# XEN only
vm_purge_xen() {
    # this should not be needed, but sometimes a xen instance gets lost
    xen_set_xenid_xmcmd
    $XMCMD destroy "build_$XENID" >/dev/null 2>&1
}

vm_fixup_xen() {
    :
}

vm_attach_root_xen() {
    :
}

vm_attach_swap_xen() {
    :
}

vm_detach_root_xen() {
    :
}

vm_detach_swap_xen() {
    :
}

vm_cleanup_xen() {
    :
}

vm_sysrq_xen() {
    :
}

vm_wipe_xen() {
    :
}