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#!/bin/sh
# This portion is fast-path, avoid external programs, NOTE: NOT -e HERE!
COMMAND="${0##*/}"
DIR=/sys/hypervisor/version
# these return non-zero if hypervisor is absent, this is detected below
read major 2> /dev/null < $DIR/major
read minor 2> /dev/null < $DIR/minor
VERSION="$major.$minor"
DIR="/usr/lib/xen-$VERSION/bin"
[ -x "$DIR/$COMMAND" ] && exec "$DIR/$COMMAND" "$@"
# Certainly didn't work, now report failures, slower-path
set -e
error() {
err="$1"
shift
echo "ERROR: " "$@" >&2
exit $err
}
[ -e "/sys/hypervisor/type" ] || error 1 "Can't find hypervisor information in sysfs!"
read type < /sys/hypervisor/type
if [ "$type" != xen ]; then
[ -n "$type" ] || error 1 "Can't read hypervisor type from sysfs!"
error 1 "Hypervisor is not xen but '$type'!"
fi
if [ ! -d "/usr/lib/xen-$VERSION" ]; then
error 127 "Can't find version $VERSION of xen utils (maybe xen-utils-$VERSION was already removed before rebooting out of Xen $VERSION), bailing out!"
fi
error 127 "Unable to execute $DIR/$COMMAND"
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