def test_options(tmpdir, fmt, cache, aio, discard):
size = 4 * 1024**2
chunk_size = 128 * 1024
src = str(tmpdir.join("src." + fmt))
qemu_img.create(src, fmt, size=size)
with qemu_nbd.open(src, fmt) as c:
for offset in range(0, size, chunk_size):
c.write(offset, struct.pack(">Q", offset))
c.flush()
dst = str(tmpdir.join("dst." + fmt))
qemu_img.create(dst, fmt, size=size)
src_addr = nbd.UnixAddress(str(tmpdir.join("src.sock")))
dst_addr = nbd.UnixAddress(str(tmpdir.join("dst.sock")))
with qemu_nbd.run(
src, fmt, src_addr,
read_only=True,
cache=cache,
aio=aio,
discard=discard), \
qemu_nbd.run(
dst, fmt, dst_addr,
cache=cache,
aio=aio,
discard=discard), \
nbd.Client(src_addr) as src_client, \
nbd.Client(dst_addr) as dst_client:
nbdutil.copy(src_client, dst_client)
qemu_img.compare(src, dst)
def test_qcow2_write_read(tmpdir):
image = str(tmpdir.join("image"))
sock = nbd.UnixAddress(tmpdir.join("sock"))
offset = 1024**2
data = b"can read and write qcow2"
create_image(image, "qcow2", 1024**3)
with qemu_nbd.run(image, "qcow2", sock):
with nbd.Client(sock) as c:
c.write(offset, data)
c.flush()
with nbd.Client(sock) as c:
assert c.read(offset, len(data)) == data
def test_handshake(tmpdir, export, fmt):
image = str(tmpdir.join("image"))
create_image(image, fmt, 1024**3)
sock = nbd.UnixAddress(tmpdir.join("sock"))
with qemu_nbd.run(image, fmt, sock, export_name=export):
if export:
c = nbd.Client(sock, export)
else:
c = nbd.Client(sock)
with c:
# TODO: test transmission_flags?
assert c.export_size == 1024**3
assert c.minimum_block_size == 1
assert c.preferred_block_size == 4096
assert c.maximum_block_size == 32 * 1024**2
assert c.base_allocation
def verify_full_backup(sock, export_name):
with nbd.Client(sock, export_name) as c:
log.debug("Backing up data with nbd client")
offset = 0
for ext in nbdutil.extents(c):
if not ext.zero:
expected = b"%d\n" % offset
data = c.read(offset, len(expected))
assert data == expected
offset += ext.length
def test_shared(tmpdir, fmt):
size = 1024**2
chunk_size = size // 2
src = str(tmpdir.join("src." + fmt))
qemu_img.create(src, fmt, size=size)
with qemu_nbd.open(src, fmt) as c:
c.write(0, b"a" * chunk_size)
c.write(0, b"b" * chunk_size)
c.flush()
dst = str(tmpdir.join("dst." + fmt))
qemu_img.create(dst, fmt, size=size)
src_addr = nbd.UnixAddress(str(tmpdir.join("src.sock")))
dst_addr = nbd.UnixAddress(str(tmpdir.join("dst.sock")))
# Start 2 qemu-nbd servers, each with 2 clients that can read and write in
# parallel for higher throughput.
with qemu_nbd.run(src, fmt, src_addr, read_only=True, shared=2), \
qemu_nbd.run(dst, fmt, dst_addr, shared=2), \
nbd.Client(src_addr) as src_client1, \
nbd.Client(src_addr) as src_client2, \
nbd.Client(dst_addr) as dst_client1, \
nbd.Client(dst_addr) as dst_client2:
# Copy first half of the image with src_client1 and dst_client2 and
# second half with src_client2 and dst_client2. In a real application
# we would have more clients, running in multiple threads.
chunk1 = src_client1.read(0, chunk_size)
dst_client1.write(0, chunk1)
chunk2 = src_client2.read(chunk_size, chunk_size)
dst_client2.write(chunk_size, chunk2)
dst_client1.flush()
dst_client2.flush()
qemu_img.compare(src, dst)
def test_zero_min_block_size(tmpdir, fmt):
offset = 1024**2
image = str(tmpdir.join("image"))
sock = nbd.UnixAddress(tmpdir.join("sock"))
create_image(image, fmt, 1024**3)
with qemu_nbd.run(image, fmt, sock):
# Fill range with data
with nbd.Client(sock) as c:
size = c.minimum_block_size
c.write(offset, b"x" * size)
c.flush()
# Zero range using minimum block size
with nbd.Client(sock) as c:
c.zero(offset, size)
c.flush()
with nbd.Client(sock) as c:
assert c.read(offset, size) == b"\0" * size
def test_zero(tmpdir, fmt):
size = 2 * 1024**2
offset = 1024**2
image = str(tmpdir.join("image"))
sock = nbd.UnixAddress(tmpdir.join("sock"))
create_image(image, fmt, size)
with qemu_nbd.run(image, fmt, sock):
# Fill image with data
with nbd.Client(sock) as c:
c.write(0, b"x" * size)
c.flush()
# Zero a range
with nbd.Client(sock) as c:
c.zero(offset, 4096)
c.flush()
with nbd.Client(sock) as c:
assert c.read(offset, 4096) == b"\0" * 4096
def test_full_backup_handshake(tmpdir, fmt, nbd_sock):
image = str(tmpdir.join("image"))
create_image(image, fmt, 1024**3)
with backup.full_backup(tmpdir, image, fmt, nbd_sock):
with nbd.Client(nbd_sock, "sda") as c:
# TODO: test transmission_flags?
assert c.export_size == 1024**3
assert c.minimum_block_size == 1
assert c.preferred_block_size == 4096
assert c.maximum_block_size == 32 * 1024**2
assert c.base_allocation
def test_raw_read(tmpdir):
image = str(tmpdir.join("image"))
sock = nbd.UnixAddress(tmpdir.join("sock"))
offset = 1024**2
data = b"can read from raw"
with open(image, "wb") as f:
f.truncate(1024**3)
f.seek(offset)
f.write(data)
with qemu_nbd.run(image, "raw", sock):
with nbd.Client(sock) as c:
assert c.read(offset, len(data)) == data
def test_raw_write(tmpdir):
image = str(tmpdir.join("image"))
with open(image, "wb") as f:
f.truncate(1024**3)
sock = nbd.UnixAddress(tmpdir.join("sock"))
offset = 1024**2
data = b"can write to raw"
with qemu_nbd.run(image, "raw", sock):
with nbd.Client(sock) as c:
c.write(offset, data)
c.flush()
with open(image, "rb") as f:
f.seek(offset)
assert f.read(len(data)) == data