1#!/bin/bash
2
3# Copyright (c) 2005 IBM Corporation
4#
5# This library is free software; you can redistribute it and/or
6# modify it under the terms of version 2.1 of the GNU Lesser General Public
7# License as published by the Free Software Foundation.
8#
9# This library is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12# Lesser General Public License for more details.
13#
14# You should have received a copy of the GNU Lesser General Public
15# License along with this library; If not, see <http://www.gnu.org/licenses/>.
16#
17
18set -x
19
20# This script is called by XenD for migration of external devices
21# It does not handle the migration of those devices itself, but
22# passes the requests on to further applications
23# It handles the low-level command line parsing and some of the
24# synchronization
25
26dir=$(dirname "$0")
27. "$dir/logging.sh"
28
29
30function ext_dev_migrate_usage() {
31cat <<EOF
32Pass the following command line parameters to the script:
33
34-step <n>              : n-th migration step
35-host <host>           : the destination host
36-domname <domain name> : name of the domain that is migrating
37-type <device type>    : the type of device that is migrating
38-subtype <dev. subtype>: the subtype of the device
39-recover               : indicates recovery request; an error
40                         occurred during migration
41-help                  : display this help screen
42EOF
43}
44
45# Parse the command line paramters. The following parameters must be
46# passed as the first ones in the sequence:
47#  -step       [required]
48#  -host       [required]
49#  -domname    [required]
50#  -type       [required]
51#  -subtype    [optional]
52#  -recover    [optional]
53# The remaining ones will be passed to the called function.
54function evaluate_params()
55{
56	local step host domname typ recover filename func stype
57	stype=""
58	while [ $# -ge 1 ]; do
59		case "$1" in
60		-step)		step=$2; shift; shift;;
61		-host)		host=$2; shift; shift;;
62		-domname)	domname=$2; shift; shift;;
63		-type)		typ=$2; shift; shift;;
64		-subtype)	stype=$2; shift; shift;;
65		-recover)	recover=1; shift;;
66		-help)		ext_dev_migrate_usage; exit 0;;
67		*)		break;;
68		esac
69	done
70
71	if [ "$step"    = "" -o \
72	     "$host"    = "" -o \
73	     "$typ"     = "" -o \
74	     "$domname" = "" ]; then
75	 	echo "Error: Parameter(s) missing (-step/-host/-type/-domname)" 1>&2
76		echo "" 1>&2
77		echo "$0 -help for usage." 1>&2
78		exit 1
79	fi
80
81	filename="$dir/$typ$stype-migration.sh"
82	if [ ! -r $filename ]; then
83		echo "Error: Could not find script '$filename'"
84		return
85	fi
86	. "$filename"
87
88	if [ "$recover" = "1" ]; then
89		func="$typ"_recover
90		eval $func $host $domname $step $*
91	else
92		func="$typ"_migration_step
93		eval $func $host $domname $step $*
94	fi
95}
96
97evaluate_params "$@"
98