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#!/usr/bin/env python3
#
# This test covers the basic fleecing workflow, which provides a
# point-in-time snapshot of a node that can be queried over NBD.
#
# Copyright (C) 2018 Red Hat, Inc.
# John helped, too.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Creator/Owner: John Snow <jsnow@redhat.com>
import iotests
from iotests import log, qemu_img, qemu_io, qemu_io_silent
iotests.script_initialize(
supported_fmts=['qcow2', 'qcow', 'qed', 'vmdk', 'vhdx', 'raw'],
supported_platforms=['linux'],
)
patterns = [("0x5d", "0", "64k"),
("0xd5", "1M", "64k"),
("0xdc", "32M", "64k"),
("0xcd", "0x3ff0000", "64k")] # 64M - 64K
overwrite = [("0xab", "0", "64k"), # Full overwrite
("0xad", "0x00f8000", "64k"), # Partial-left (1M-32K)
("0x1d", "0x2008000", "64k"), # Partial-right (32M+32K)
("0xea", "0x3fe0000", "64k")] # Adjacent-left (64M - 128K)
zeroes = [("0", "0x00f8000", "32k"), # Left-end of partial-left (1M-32K)
("0", "0x2010000", "32k"), # Right-end of partial-right (32M+64K)
("0", "0x3fe0000", "64k")] # overwrite[3]
remainder = [("0xd5", "0x108000", "32k"), # Right-end of partial-left [1]
("0xdc", "32M", "32k"), # Left-end of partial-right [2]
("0xcd", "0x3ff0000", "64k")] # patterns[3]
with iotests.FilePath('base.img') as base_img_path, \
iotests.FilePath('fleece.img') as fleece_img_path, \
iotests.FilePath('nbd.sock', iotests.sock_dir) as nbd_sock_path, \
iotests.VM() as vm:
log('--- Setting up images ---')
log('')
assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
assert qemu_img('create', '-f', "qcow2", fleece_img_path, '64M') == 0
for p in patterns:
qemu_io('-f', iotests.imgfmt,
'-c', 'write -P%s %s %s' % p, base_img_path)
log('Done')
log('')
log('--- Launching VM ---')
log('')
vm.add_drive(base_img_path)
vm.launch()
log('Done')
log('')
log('--- Setting up Fleecing Graph ---')
log('')
src_node = "drive0"
tgt_node = "fleeceNode"
# create tgt_node backed by src_node
log(vm.qmp("blockdev-add", **{
"driver": "qcow2",
"node-name": tgt_node,
"file": {
"driver": "file",
"filename": fleece_img_path,
},
"backing": src_node,
}))
# Establish COW from source to fleecing node
log(vm.qmp("blockdev-backup",
device=src_node,
target=tgt_node,
sync="none"))
log('')
log('--- Setting up NBD Export ---')
log('')
nbd_uri = 'nbd+unix:///%s?socket=%s' % (tgt_node, nbd_sock_path)
log(vm.qmp("nbd-server-start",
**{"addr": { "type": "unix",
"data": { "path": nbd_sock_path } } }))
log(vm.qmp("nbd-server-add", device=tgt_node))
log('')
log('--- Sanity Check ---')
log('')
for p in (patterns + zeroes):
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
log('')
log('--- Testing COW ---')
log('')
for p in overwrite:
cmd = "write -P%s %s %s" % p
log(cmd)
log(vm.hmp_qemu_io(src_node, cmd))
log('')
log('--- Verifying Data ---')
log('')
for p in (patterns + zeroes):
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent('-r', '-f', 'raw', '-c', cmd, nbd_uri) == 0
log('')
log('--- Cleanup ---')
log('')
log(vm.qmp('block-job-cancel', device=src_node))
log(vm.event_wait('BLOCK_JOB_CANCELLED'),
filters=[iotests.filter_qmp_event])
log(vm.qmp('nbd-server-stop'))
log(vm.qmp('blockdev-del', node_name=tgt_node))
vm.shutdown()
log('')
log('--- Confirming writes ---')
log('')
for p in (overwrite + remainder):
cmd = "read -P%s %s %s" % p
log(cmd)
assert qemu_io_silent(base_img_path, '-c', cmd) == 0
log('')
log('Done')
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