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gns3-server/tests/compute/qemu/test_qcow2.py

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#!/usr/bin/env python
#
# Copyright (C) 2020 GNS3 Technologies Inc.
#
# 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 3 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/>.
import os
import pytest
import shutil
from gns3server.compute.qemu.utils.qcow2 import Qcow2, Qcow2Error
def qemu_img():
"""
Return the path of qemu-img on system.
We can't use shutil.which because for safety reason we break
the PATH to avoid test interacting with real binaries
"""
paths = [
"/usr/bin/qemu-img",
"/usr/local/bin/qemu-img"
]
for path in paths:
if os.path.exists(path):
return path
return None
def test_valid_base_file():
qcow2 = Qcow2("tests/resources/empty8G.qcow2")
assert qcow2.version == 3
assert qcow2.backing_file is None
def test_valid_linked_file():
qcow2 = Qcow2("tests/resources/linked.qcow2")
assert qcow2.version == 3
assert qcow2.backing_file == "empty8G.qcow2"
def test_invalid_file():
with pytest.raises(Qcow2Error):
Qcow2("tests/resources/nvram_iou")
def test_invalid_empty_file(tmpdir):
open(str(tmpdir / 'a'), 'w+').close()
with pytest.raises(Qcow2Error):
Qcow2(str(tmpdir / 'a'))
@pytest.mark.skipif(qemu_img() is None, reason="qemu-img is not available")
async def test_rebase(loop, tmpdir):
shutil.copy("tests/resources/empty8G.qcow2", str(tmpdir / "empty16G.qcow2"))
shutil.copy("tests/resources/linked.qcow2", str(tmpdir / "linked.qcow2"))
qcow2 = Qcow2(str(tmpdir / "linked.qcow2"))
assert qcow2.version == 3
assert qcow2.backing_file == "empty8G.qcow2"
await qcow2.rebase(qemu_img(), str(tmpdir / "empty16G.qcow2"), "qcow2")
assert qcow2.backing_file == str(tmpdir / "empty16G.qcow2")