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import os
import tempfile
from contextlib import ExitStack
import pytest
from buildstream.sandbox._mounter import Mounter
@pytest.mark.skipif(not os.geteuid() == 0, reason="requires root permissions")
def test_bind_mount():
with ExitStack() as stack:
src = stack.enter_context(tempfile.TemporaryDirectory())
target = stack.enter_context(tempfile.TemporaryDirectory())
with open(os.path.join(src, "test"), "a") as test:
test.write("Test")
with Mounter.bind_mount(target, src) as dest:
# Ensure we get the correct path back
assert dest == target
# Ensure we can access files from src from target
with open(os.path.join(target, "test"), "r") as test:
assert test.read() == "Test"
# Ensure the files from src are gone from target
with pytest.raises(FileNotFoundError):
with open(os.path.join(target, "test"), "r"):
# Actual contents don't matter
pass
# Ensure the files in src are still in src
with open(os.path.join(src, "test"), "r") as test:
assert test.read() == "Test"
@pytest.mark.skipif(not os.geteuid() == 0, reason="requires root permissions")
def test_mount_proc():
with ExitStack() as stack:
src = "/proc"
target = stack.enter_context(tempfile.TemporaryDirectory())
with Mounter.mount(target, src, mount_type="proc", ro=True) as dest:
# Ensure we get the correct path back
assert dest == target
# Ensure /proc is actually mounted
assert os.listdir(src) == os.listdir(target)
# Ensure /proc is unmounted correctly
assert os.listdir(target) == []
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