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74 lines
1.9 KiB
Bash
Executable File
74 lines
1.9 KiB
Bash
Executable File
#!/bin/bash -
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# libguestfs
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# Copyright (C) 2011-2025 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# Test that qemu snapshots are really isolating writes from the
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# underlying disk image. If this test were to fail, you could expect
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# libguestfs to cause massive disk corruption on live guests.
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source ./functions.sh
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set -e
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set -x
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skip_if_skipped
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f=isolation-qcow2.img
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rm -f $f
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guestfish disk-create $f qcow2 100M preallocation:metadata
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md5sum="$(do_md5 $f)"
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guestfish <<EOF
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add-drive-opts $f format:qcow2 readonly:true
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run
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# Read some of the backing file to ensure reads don't modify it.
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download-offset /dev/sda - 10M 10M | cat >/dev/null
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part-disk /dev/sda mbr
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mkfs ext2 /dev/sda1
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mount /dev/sda1 /
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write /test This_is_a_test
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fill-pattern abc 5M /test2
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# Really try hard to force writes to the disk.
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umount-all
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sync
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EOF
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# Now verify that the original disks have not been touched.
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function serious_error
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{
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echo
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echo
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echo "***** SERIOUS ERROR *****"
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echo "qemu’s snapshot isolation does not appear to be working."
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echo "Running libguestfs could cause disk corruption on live guests."
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echo
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echo "DO NOT USE libguestfs before you have resolved this problem."
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echo
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exit 1
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}
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if [ "$(do_md5 $f)" != "$md5sum" ]; then
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serious_error
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fi
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rm $f
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