e5ff287f5a
The FS_IOC_{GET,SET}FLAGS ioctl numbers are not stable across different
architectures. Most of them use the asm-generic versions, but ALPHA and
SPARC in particular use completely different IOC number setups (see the
definition of _IOC, _IOR, _IOW, etc. in the kernel).
This commit moves the helpers for `FS_IMMUTABLE_FL` into
`osbuild/util/` and adds explicit tests. This will make sure that we
catch any ioctl mismatches as soon as possible when we run the osbuild
test-suite on other architectures. Until then, we will have to live with
this mismatch.
72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
#
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# Tests for the `osbuild.util.linux` module.
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#
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import os
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import subprocess
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import tempfile
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import unittest
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import osbuild.util.linux as linux
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class TestUtilLinux(unittest.TestCase):
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def setUp(self):
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self.vartmpdir = tempfile.TemporaryDirectory(dir="/var/tmp")
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def tearDown(self):
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self.vartmpdir.cleanup()
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def test_ioctl_get_immutable(self):
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#
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# Test the `ioctl_get_immutable()` helper and make sure it works
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# as intended.
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#
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with open(f"{self.vartmpdir.name}/immutable", "x") as f:
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assert not linux.ioctl_get_immutable(f.fileno())
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@unittest.skipUnless(os.geteuid() == 0, "root-only")
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def test_ioctl_toggle_immutable(self):
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#
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# Test the `ioctl_toggle_immutable()` helper and make sure it works
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# as intended.
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#
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with open(f"{self.vartmpdir.name}/immutable", "x") as f:
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# Check the file is mutable by default and if we clear it again.
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assert not linux.ioctl_get_immutable(f.fileno())
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linux.ioctl_toggle_immutable(f.fileno(), False)
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assert not linux.ioctl_get_immutable(f.fileno())
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# Set immutable and check for it. Try again to verify with flag set.
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linux.ioctl_toggle_immutable(f.fileno(), True)
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assert linux.ioctl_get_immutable(f.fileno())
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linux.ioctl_toggle_immutable(f.fileno(), True)
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assert linux.ioctl_get_immutable(f.fileno())
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# Verify immutable files cannot be unlinked.
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with self.assertRaises(OSError):
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os.unlink(f"{self.vartmpdir.name}/immutable")
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# Check again that clearing the flag works.
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linux.ioctl_toggle_immutable(f.fileno(), False)
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assert not linux.ioctl_get_immutable(f.fileno())
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# This time, check that we actually set the same flag as `chattr`.
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subprocess.run(["chattr", "+i",
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f"{self.vartmpdir.name}/immutable"], check=True)
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assert linux.ioctl_get_immutable(f.fileno())
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# Same for clearing it.
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subprocess.run(["chattr", "-i",
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f"{self.vartmpdir.name}/immutable"], check=True)
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assert not linux.ioctl_get_immutable(f.fileno())
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# Verify we can unlink the file again, once the flag is cleared.
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os.unlink(f"{self.vartmpdir.name}/immutable")
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if __name__ == "__main__":
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unittest.main()
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