[Bug] Bug related to interpreting the path to the directory on Linux

[YALdysse]

Hi, @themuffinator.

First of all, I’d like to thank you for creating this project and thereby making it possible to play Quake 4 natively on Linux. I really appreciate it. You’re a hero of the Linux community.

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I found a bug in engine version 0.12 on Linux.

The bug is that if you run the game with the command to save settings alongside the game (portable mode) and the path to the game directory contains “...” (three consecutive dots), the settings directory will not be created. As a result, the game will lose all settings every time the engine is closed.

log.txt

Here is the command i launch the engine:

"./openQ4-client_x64" +set fs_basepath "${PWD}/../" +set fs_homepath "${CURRENT_DIR}/userdata/${USER}" "$@"

[themuffinator]

Thanks for the clear reproduction and for attaching the log — the final Couldn't write openQ4Config.cfg lines made this very direct to trace.

The problem is in openQ4's directory-creation guard: it treated any adjacent dots in the full OS path as a parent traversal, so a legitimate directory ending in ... was rejected before the settings directory could be created. PR #129 changes that check to reject only an exact .. path component, while retaining traversal protection for both slash styles. I also added regression cases based on the path shape from your report, and the full Windows x64 build passes.

I'll leave this issue open while the PR completes review/CI; merging it will close the issue automatically. Thanks again for catching this edge case.

[YALdysse]

Thank you for resolving this issue and explaining what caused it. It’s a pleasure doing business with you. I wish you success and inspiration.