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import os
import subprocess
import sys
import tempfile
import pytest
from typing import IO
from tests.testsupport import *
def test_sparse():
file = tempfile.NamedTemporaryFile(delete=False)
try:
sabctools.sparse(file, 100)
assert os.path.getsize(file.name) == 100
assert is_sparse(file) is True
finally:
file.close()
os.unlink(file.name)
@pytest.mark.parametrize(
"length,position",
[
(1024, 0),
(1024, 512),
(1024, 4096),
],
)
def test_sparse_position_expected(length, position):
with tempfile.TemporaryFile() as file:
file.seek(position)
sabctools.sparse(file, length)
assert file.tell() == position
def is_sparse(file: IO) -> bool:
"""Is the file sparse?
On Windows this closes the file"""
if sys.platform == "win32":
file.close()
return b"This file is set as sparse" in subprocess.run(
["fsutil", "sparse", "queryflag", file.name],
capture_output=True
).stdout
return os.stat(file.name).st_blocks * 512 < os.path.getsize(file.name)
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