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import os
import pytest
from buildstream.utils import save_file_atomic
def test_save_new_file(tmpdir):
filename = os.path.join(str(tmpdir), "savefile-success.test")
with save_file_atomic(filename, "w") as f:
f.write("foo\n")
assert os.listdir(str(tmpdir)) == ["savefile-success.test"]
with open(filename) as f:
assert f.read() == "foo\n"
def test_save_over_existing_file(tmpdir):
filename = os.path.join(str(tmpdir), "savefile-overwrite.test")
with open(filename, "w") as f:
f.write("existing contents\n")
with save_file_atomic(filename, "w") as f:
f.write("overwritten contents\n")
assert os.listdir(str(tmpdir)) == ["savefile-overwrite.test"]
with open(filename) as f:
assert f.read() == "overwritten contents\n"
def test_exception_new_file(tmpdir):
filename = os.path.join(str(tmpdir), "savefile-exception.test")
with pytest.raises(RuntimeError):
with save_file_atomic(filename, "w") as f:
f.write("Some junk\n")
raise RuntimeError("Something goes wrong")
assert os.listdir(str(tmpdir)) == []
def test_exception_existing_file(tmpdir):
filename = os.path.join(str(tmpdir), "savefile-existing.test")
with open(filename, "w") as f:
f.write("existing contents\n")
with pytest.raises(RuntimeError):
with save_file_atomic(filename, "w") as f:
f.write("Some junk\n")
raise RuntimeError("Something goes wrong")
assert os.listdir(str(tmpdir)) == ["savefile-existing.test"]
with open(filename) as f:
assert f.read() == "existing contents\n"
def test_attributes(tmpdir):
filename = os.path.join(str(tmpdir), "savefile-attributes.test")
with save_file_atomic(filename, "w") as f:
assert f.real_filename == filename
assert f.name != filename
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