[heyvaldemar]

Description

The Killing Floor 2 Linux dedicated server does not create KFGame/Cache, the
directory it uses when loading maps, including Steam Workshop maps. The KF2 wiki
lists this as a known Linux issue and gives the remedy as mkdir -p KFGame/Cache
inside the server install directory. fix_kf2.sh already runs post-install for
KF2, so it creates the directory there, only once KFGame exists, matching the
mkdir pattern fix_cmw.sh already uses.

Fixes the missing-cache-folder step server admins currently have to do by hand.

Affected servers: kf2

Type of change

• Bug fix (a change which fixes an issue).

Testing

• Source: KF2 wiki, Dedicated Server page, "Known issue on Linux servers":
  "Linux servers currently do not create the proper cache folder, you must
  create it inside your server install directory: mkdir -p KFGame/Cache".
• I have not run a full LinuxGSM KF2 install for this change; the evidence is the
  wiki above and the production observation below, and the guard (KFGame must
  already exist) means it is a no-op on an un-installed server. Happy to add an
  install-time check if you'd like one before merge.
• In a containerised KF2 deployment I run, the equivalent directory creation has
  been in place since 2026-10-22; across the map changes in the 75 hours after,
  the map-load segfault that had preceded it did not recur. A documented gap
  closed, not a claimed cure.
• shellcheck: the new block follows the module's existing idiom (fixname +
  fn_fix_msg_start/fn_fix_msg_end, as in fix_cmw.sh).

Risk and rollback

• Risk level: low
• Rollback plan: revert the commit; the only effect is one mkdir -p on install.

Breaking changes

• No breaking changes.

Documentation

• No documentation update required.

Checklist

PR will not be merged until all steps are complete.

• This pull request links to an issue ("Fixes", or "Related to" for a partial fix).
• This pull request uses the develop branch as its base.
• This pull request subject follows the Conventional Commits standard.
• This code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have provided a detailed enough description of this PR.

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This change was prepared with AI assistance and reviewed before submitting.

[dgibbs64]

Thanks for the PR and for the clear write-up. I merged this a little early, then finished testing it on a test server with a fresh kf2server install, and I've reverted it in c763125.

On the current server build (10897), the game creates KFGame/Cache itself the first time it downloads a Workshop item. With the folder deleted, the server downloaded the item into KFGame/Cache/<id>/0/BrewedPC/Maps/ and then loaded the Workshop map from there without problems, so the wiki note looks like it dates from an older build.

The crash I could reproduce comes from setting a Workshop map as the starting map before the server has downloaded it. In that case it aborts at LoadMap whether or not Cache exists. Starting on a stock map first, so the server can fetch the item, avoids it. That's likely what you were seeing.

We'll add the "start on a stock map first" tip to the docs instead. Thanks again for looking into it.