a367a0df1d
Add a `Loop.is_bound_to` helper that checks if the looback device is bound if is so if the backing file refers to the same file as `fd`. The latter is done by comparing the device and inode information.
89 lines
1.9 KiB
Python
89 lines
1.9 KiB
Python
#
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# Test for the loop.py
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#
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import contextlib
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import os
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from tempfile import TemporaryDirectory, TemporaryFile
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import pytest
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from osbuild import loop
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from ..test import TestBase
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@pytest.fixture(name="tempdir")
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def tempdir_fixture():
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with TemporaryDirectory(prefix="loop-") as tmp:
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yield tmp
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@pytest.mark.skipif(not TestBase.can_bind_mount(), reason="root only")
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def test_basic(tempdir):
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path = os.path.join(tempdir, "test.img")
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ctl = loop.LoopControl()
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assert ctl
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with pytest.raises(ValueError):
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ctl.loop_for_fd(-1)
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lo, f = None, None
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try:
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f = open(path, "wb+")
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f.truncate(1024)
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f.flush()
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lo = ctl.loop_for_fd(f.fileno(), autoclear=True)
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assert lo.is_bound_to(f.fileno())
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sb = os.fstat(f.fileno())
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assert lo
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assert lo.devname
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info = lo.get_status()
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assert info.lo_inode == sb.st_ino
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assert info.lo_number == lo.minor
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# check for `LoopInfo.is_bound_to` helper
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assert info.is_bound_to(sb)
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with TemporaryFile(dir=tempdir) as t:
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t.write(b"")
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t.flush()
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st = os.fstat(t.fileno())
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assert not info.is_bound_to(st)
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# check for autoclear flags setting and helpers
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assert info.autoclear
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lo.set_status(autoclear=False)
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info = lo.get_status()
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assert not info.autoclear
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finally:
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if lo:
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with contextlib.suppress(OSError):
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lo.clear_fd()
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lo.close()
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if f:
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f.close()
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ctl.close()
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# closing must be a no-op on a closed LoopControl
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ctl.close()
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# check we raise exceptions on methods that require
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# an open LoopControl
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for fn in (ctl.add, ctl.remove, ctl.get_unbound):
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with pytest.raises(RuntimeError):
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fn()
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with pytest.raises(RuntimeError):
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ctl.loop_for_fd(0)
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