1#!/usr/bin/env bash
2#
3# Test that qemu-img info --backing-chain detects infinite loops
4#
5# Copyright (C) 2012 Red Hat, Inc.
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19#
20
21# creator
22owner=stefanha@redhat.com
23
24seq=`basename $0`
25echo "QA output created by $seq"
26
27status=1	# failure is the default!
28
29_cleanup()
30{
31    _cleanup_test_img
32    rm -f "$TEST_IMG".[123].base
33}
34trap "_cleanup; exit \$status" 0 1 2 3 15
35
36# get standard environment, filters and checks
37. ./common.rc
38. ./common.filter
39
40# Any format supporting backing files
41_supported_fmt qcow2 qed
42_supported_proto file
43
44
45size=128M
46_make_test_img $size
47$QEMU_IMG rebase -u -b "$TEST_IMG" "$TEST_IMG"
48
49echo
50echo "== backing file references self =="
51_img_info --backing-chain
52
53_make_test_img $size
54mv "$TEST_IMG" "$TEST_IMG.base"
55_make_test_img -b "$TEST_IMG.base" $size
56$QEMU_IMG rebase -u -b "$TEST_IMG" "$TEST_IMG.base"
57
58echo
59echo "== parent references self =="
60_img_info --backing-chain
61
62_make_test_img $size
63mv "$TEST_IMG" "$TEST_IMG.1.base"
64_make_test_img -b "$TEST_IMG.1.base" $size
65mv "$TEST_IMG" "$TEST_IMG.2.base"
66_make_test_img -b "$TEST_IMG.2.base" $size
67mv "$TEST_IMG" "$TEST_IMG.3.base"
68_make_test_img -b "$TEST_IMG.3.base" $size
69$QEMU_IMG rebase -u -b "$TEST_IMG.2.base" "$TEST_IMG.1.base"
70
71echo
72echo "== ancestor references another ancestor =="
73_img_info --backing-chain
74
75_make_test_img $size
76mv "$TEST_IMG" "$TEST_IMG.1.base"
77_make_test_img -b "$TEST_IMG.1.base" $size
78mv "$TEST_IMG" "$TEST_IMG.2.base"
79_make_test_img -b "$TEST_IMG.2.base" $size
80
81echo
82echo "== finite chain of length 3 (human) =="
83_img_info --backing-chain
84
85echo
86echo "== finite chain of length 3 (json) =="
87_img_info --backing-chain --output=json
88
89# success, all done
90echo "*** done"
91rm -f $seq.full
92status=0
93