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dvsim sometimes erases the current directory #226
Description
If cov_db_dir is empty (which it is for Verilator), then dvsim will both crash with an exception about . not being a valid path, and it will recursively delete the current directory. That really is what Python does by default. Mental.
~/d1$ touch foo
~/d1$ python3
Python 3.13.7 (main, Mar 3 2026, 12:19:54) [GCC 15.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
Ctrl click to launch VS Code Native REPL
>>> from pathlib import Path
>>> import shutil
>>> shutil.rmtree(Path(""))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
import platform
File "/usr/lib/python3.13/shutil.py", line 763, in rmtree
_rmtree_safe_fd(stack, onexc)
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/lib/python3.13/shutil.py", line 707, in _rmtree_safe_fd
onexc(func, path, err)
~~~~~^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.13/shutil.py", line 658, in _rmtree_safe_fd
os.rmdir(name, dir_fd=dirfd)
~~~~~~~~^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 22] Invalid argument: PosixPath('.')
>>>
~/d1$ ls
~/d1$
And yeah Path("").exists() is True! I'm struggling to think why that makes any sense.
Anyway fix here, I think. It may not be complete but it works for me: df68de6
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