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 $seq"
26
27status=1	# failure is the default!
28
29_cleanup()
30{
31    _cleanup_test_img
32    for img in "$TEST_IMG".[123].base; do
33        _rm_test_img "$img"
34    done
35}
36trap "_cleanup; exit \$status" 0 1 2 3 15
37
38# get standard environment, filters and checks
39. ./common.rc
40. ./common.filter
41
42# Any format supporting backing files
43_supported_fmt qcow2 qed
44_supported_proto file
45
46
47size=128M
48_make_test_img $size
49$QEMU_IMG rebase -u -b "$TEST_IMG" -F $IMGFMT "$TEST_IMG"
50
51echo
52echo "== backing file references self =="
53_img_info --backing-chain
54
55_make_test_img $size
56mv "$TEST_IMG" "$TEST_IMG.base"
57_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $size
58$QEMU_IMG rebase -u -b "$TEST_IMG" -F $IMGFMT "$TEST_IMG.base"
59
60echo
61echo "== parent references self =="
62_img_info --backing-chain
63
64_make_test_img $size
65mv "$TEST_IMG" "$TEST_IMG.1.base"
66_make_test_img -b "$TEST_IMG.1.base" -F $IMGFMT $size
67mv "$TEST_IMG" "$TEST_IMG.2.base"
68_make_test_img -b "$TEST_IMG.2.base" -F $IMGFMT $size
69mv "$TEST_IMG" "$TEST_IMG.3.base"
70_make_test_img -b "$TEST_IMG.3.base" -F $IMGFMT $size
71$QEMU_IMG rebase -u -b "$TEST_IMG.2.base" -F $IMGFMT "$TEST_IMG.1.base"
72
73echo
74echo "== ancestor references another ancestor =="
75_img_info --backing-chain
76
77_make_test_img $size
78mv "$TEST_IMG" "$TEST_IMG.1.base"
79_make_test_img -b "$TEST_IMG.1.base" -F $IMGFMT $size
80mv "$TEST_IMG" "$TEST_IMG.2.base"
81_make_test_img -b "$TEST_IMG.2.base" -F $IMGFMT $size
82
83echo
84echo "== finite chain of length 3 (human) =="
85# Exclude backing format, since qed differs from qcow2 on what gets stored
86_img_info --backing-chain | grep -v '^backing file format:'
87
88echo
89echo "== finite chain of length 3 (json) =="
90_img_info --backing-chain --output=json | grep -v 'backing-filename-format'
91
92# success, all done
93echo "*** done"
94rm -f $seq.full
95status=0
96