#!/bin/sh
#-----------------------------------------------------------------------
# /var/install/include/virtlib -- eislib functions for detecting virtualization context
#
# Creation:     2009-10-23 alex
# Last Update:  $Id: virtlib 22841 2010-01-29 06:35:35Z alex $
#
# Copyright (c) 2009--2010 the eisfair team, team(at)eisfair(dot)org
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#-----------------------------------------------------------------------

#-----------------------------------------------------------------------
# interface description
#-----------------------------------------------------------------------
# is_running_in_xendomu()         : returns 0 or 1 as return codes if
#                                   running in Xen DomU or not
# check_running_on_xen_detailed() : echos one of four strings depending
#                                   on virtualization context:
#                                   'noxen', 'xendomu', 'xendom0', 'hvm'
#-----------------------------------------------------------------------

#=======================================================================
# only include this file once
#=======================================================================

if [ "${_EISLIB_VIRTLIB}" != 'true' ]
then

_EISLIB_VIRTLIB='true'

#=======================================================================
# include other libs
#=======================================================================
. /var/install/include/check-eisfair-version

#=======================================================================
# initialize local variables
#=======================================================================
_NO_XEN='false'
_IS_RUNNING_IN_DOMU='false'
_IS_XEN_DOM0='false'
_IS_EISXEN_SYSTEM='false'
_HAS_EISXEN_INSTALLED='false'
_IS_HVM='false'

#=======================================================================
# local functions
#=======================================================================
_collect_xen_context()
{
    local _DETECT_ANSWER=`xen-detect`
    if [ "${_DETECT_ANSWER}" = 'Not running on Xen.' ]
    then
        _NO_XEN='true'
    else
        # PV or HVM?
        echo "${_DETECT_ANSWER}" | grep -q 'PV'
        if [ $? -eq 0 ]
        then
            # PV, could be DomU or Dom0, do some tests to get evidence

            if pgrep -f xend &>/dev/null
            then
                _IS_XEN_DOM0='true'
            fi

            if `echo "${EISFAIR_SYSTEM}" | grep -q 'eisxen'`
            then
                _IS_EISXEN_SYSTEM='true'
            fi

            if [ `/var/install/bin/check-version eisxen` = 'new' ]
            then
                _HAS_EISXEN_INSTALLED='true'
            fi

            if [ "${_IS_XEN_DOM0}" = 'true'           \
                -o "${_IS_EISXEN_SYSTEM}" = 'true'    \
                -o "${_HAS_EISXEN_INSTALLED}" = 'true' ]
            then
                _IS_XEN_DOM0='true'
            else
                _IS_RUNNING_IN_DOMU='true'
            fi
        else
            _IS_HVM='true'
        fi
    fi
}

#=======================================================================
# exported functions
#=======================================================================
virtlib_debug_output()
{
    _collect_xen_context
    echo "_NO_XEN:                  ${_NO_XEN}"
    echo "_IS_RUNNING_IN_DOMU:      ${_IS_RUNNING_IN_DOMU}"
    echo "_IS_XEN_DOM0:             ${_IS_XEN_DOM0}"
    echo "_IS_EISXEN_SYSTEM:        ${_IS_EISXEN_SYSTEM}"
    echo "_HAS_EISXEN_INSTALLED:    ${_HAS_EISXEN_INSTALLED}"
    echo "_IS_HVM:                  ${_IS_HVM}"
}

is_running_in_xendomu()
{
    _collect_xen_context
    if [ "${_IS_RUNNING_IN_DOMU}" = 'true' ]
    then
        return 0
    else
        return 1
    fi
}

check_running_on_xen_detailed()
{
    _collect_xen_context
    if [ "${_NO_XEN}" = 'true' ]
    then
        echo 'noxen'
    elif [ "${_IS_RUNNING_IN_DOMU}" = 'true' ]
    then
        echo 'xendomu'
    elif [ "${_IS_XEN_DOM0}" = 'true' ]
    then
        echo 'xendom0'
    elif [ "${_IS_HVM}" = 'true' ]
    then
        echo 'hvm'
    fi
}

#=======================================================================
# end only include once
#=======================================================================

fi

#=======================================================================
# end
#=======================================================================