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# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Test Spack's FileCache."""
import os
import pytest
from spack.util.file_cache import FileCache
@pytest.fixture()
def file_cache(tmpdir):
"""Returns a properly initialized FileCache instance"""
return FileCache(str(tmpdir))
def test_write_and_read_cache_file(file_cache):
"""Test writing then reading a cached file."""
with file_cache.write_transaction('test.yaml') as (old, new):
assert old is None
assert new is not None
new.write("foobar\n")
with file_cache.read_transaction('test.yaml') as stream:
text = stream.read()
assert text == "foobar\n"
def test_write_and_remove_cache_file(file_cache):
"""Test two write transactions on a cached file. Then try to remove an
entry from it.
"""
with file_cache.write_transaction('test.yaml') as (old, new):
assert old is None
assert new is not None
new.write("foobar\n")
with file_cache.write_transaction('test.yaml') as (old, new):
assert old is not None
text = old.read()
assert text == "foobar\n"
assert new is not None
new.write("barbaz\n")
with file_cache.read_transaction('test.yaml') as stream:
text = stream.read()
assert text == "barbaz\n"
file_cache.remove('test.yaml')
# After removal both the file and the lock file should not exist
assert not os.path.exists(file_cache.cache_path('test.yaml'))
assert not os.path.exists(file_cache._lock_path('test.yaml'))
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