03a970bb6f
Add test for "qemu-img convert -O qcow2 -c" to NBD target. The tests create a OVA file and write compressed qcow2 disk content directly into the OVA file via qemu-nbd. Signed-off-by: Nir Soffer <nsoffer@redhat.com> Message-Id: <20200727215846.395443-5-nsoffer@redhat.com> Tested-by: Eric Blake <eblake@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
128 lines
3.8 KiB
Python
Executable File
128 lines
3.8 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Tests converting qcow2 compressed to NBD
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#
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# Copyright (c) 2020 Nir Soffer <nirsof@gmail.com>
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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, see <http://www.gnu.org/licenses/>.
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#
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# owner=nirsof@gmail.com
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import io
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import tarfile
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import iotests
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from iotests import (
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file_path,
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qemu_img,
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qemu_img_check,
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qemu_img_create,
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qemu_img_log,
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qemu_img_measure,
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qemu_io,
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qemu_nbd_popen,
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)
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iotests.script_initialize(supported_fmts=["qcow2"])
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# Create source disk. Using qcow2 to enable strict comparing later, and
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# avoid issues with random filesystem on CI environment.
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src_disk = file_path("disk.qcow2")
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qemu_img_create("-f", iotests.imgfmt, src_disk, "1g")
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qemu_io("-f", iotests.imgfmt, "-c", "write 1m 64k", src_disk)
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# The use case is writing qcow2 image directly into an ova file, which
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# is a tar file with specific layout. This is tricky since we don't know the
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# size of the image before compressing, so we have to do:
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# 1. Add an ovf file.
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# 2. Find the offset of the next member data.
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# 3. Make room for image data, allocating for the worst case.
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# 4. Write compressed image data into the tar.
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# 5. Add a tar entry with the actual image size.
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# 6. Shrink the tar to the actual size, aligned to 512 bytes.
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tar_file = file_path("test.ova")
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with tarfile.open(tar_file, "w") as tar:
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# 1. Add an ovf file.
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ovf_data = b"<xml/>"
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ovf = tarfile.TarInfo("vm.ovf")
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ovf.size = len(ovf_data)
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tar.addfile(ovf, io.BytesIO(ovf_data))
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# 2. Find the offset of the next member data.
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offset = tar.fileobj.tell() + 512
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# 3. Make room for image data, allocating for the worst case.
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measure = qemu_img_measure("-O", "qcow2", src_disk)
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tar.fileobj.truncate(offset + measure["required"])
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# 4. Write compressed image data into the tar.
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nbd_sock = file_path("nbd-sock", base_dir=iotests.sock_dir)
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nbd_uri = "nbd+unix:///exp?socket=" + nbd_sock
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# Use raw format to allow creating qcow2 directly into tar file.
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with qemu_nbd_popen(
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"--socket", nbd_sock,
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"--export-name", "exp",
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"--format", "raw",
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"--offset", str(offset),
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tar_file):
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iotests.log("=== Target image info ===")
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qemu_img_log("info", nbd_uri)
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qemu_img(
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"convert",
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"-f", iotests.imgfmt,
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"-O", "qcow2",
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"-c",
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src_disk,
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nbd_uri)
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iotests.log("=== Converted image info ===")
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qemu_img_log("info", nbd_uri)
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iotests.log("=== Converted image check ===")
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qemu_img_log("check", nbd_uri)
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iotests.log("=== Comparing to source disk ===")
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qemu_img_log("compare", src_disk, nbd_uri)
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actual_size = qemu_img_check(nbd_uri)["image-end-offset"]
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# 5. Add a tar entry with the actual image size.
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disk = tarfile.TarInfo("disk")
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disk.size = actual_size
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tar.addfile(disk)
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# 6. Shrink the tar to the actual size, aligned to 512 bytes.
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tar_size = offset + (disk.size + 511) & ~511
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tar.fileobj.seek(tar_size)
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tar.fileobj.truncate(tar_size)
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with tarfile.open(tar_file) as tar:
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members = [{"name": m.name, "size": m.size, "offset": m.offset_data}
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for m in tar]
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iotests.log("=== OVA file contents ===")
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iotests.log(members)
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