mergerfs/tests/TEST_use_fallocate_after_unlink

#!/usr/bin/env python3

import os
import sys
import tempfile


def main():
    (fd, filepath) = tempfile.mkstemp(dir=sys.argv[1])

    os.posix_fallocate(fd, 0, 1024)

    st1 = os.fstat(fd)
    if st1.st_size < 1024:
        os.close(fd)
        os.unlink(filepath)
        print("fallocate before unlink: expected size >= 1024, got {}".format(st1.st_size), end='')
        return 1

    os.unlink(filepath)

    os.posix_fallocate(fd, 1024, 2048)

    st2 = os.fstat(fd)
    if st2.st_size < 1024 + 2048:
        os.close(fd)
        print("fallocate after unlink: expected size >= 3072, got {}".format(st2.st_size), end='')
        return 1

    os.close(fd)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())