[TibixDev]

What

Track the /temp0 mount. Reject a second mount, preserve files on unmount, block new path lookups while unmounted, and restore access on remount. Initialization also blocks files left by a previous run. Format and space queries require an active mount.

Supersedes the sceAppContentTemporaryDataUnmount stubs in #407/#545 for this function. It does not replace the other work in those PRs.

Tested

Fedora 44, Release: app-content, working-directory, and directory tests. Covers remount, formatting, invalid arguments, unchanged output on failure, and neighboring paths. Contribution checks pass.

Open file handles remain usable after unmount. Console behavior for that case is unverified and documented in TechnicalDebt. Windows was not tested.

Checklist

• Current main; related stubs and implementations checked.
• One topic.
• No new code comments.
• Unsupported paths still throw; UI stubs are documented.
• No notes, logs, or images in the repository.
• No new third-party code.
• General behavior.
• Depends on: none.
• AI-assisted: yes.

[TibixDev]

Reproduced with Skyrim, PPSA03747, content version 01.001.010, on upstream a9ba39c927713cf294b8e1b7877ddb365d3a1d6f. Linux, GCC 16, Release build in Fedora 44.

A fresh relink with the default eager binding exits with code 127 before guest startup:

undefined symbol: bcolXMmp6qQ

This is the NID for sceAppContentTemporaryDataUnmount, imported by Skyrim. The function is absent from upstream. Applying only this PR clears that loader failure; startup then stops on the reachability-unregister import addressed by #1322. guest_appcontent passes on this upstream-based test branch.

This proves a missing-import startup blocker. It does not prove that Skyrim executes the unmount body before startup or establish console-equivalent mount semantics. This supplies the title evidence requested in #1299.

AI-assisted investigation and reply.

[github-actions]

Progress report (b1c5f10 → 3355524)

➖ System libraries: 85.41% (+0.0%, +1 implemented functions)

✅ 1 implemented

Library	Name
libSceAppContent	sceAppContentTemporaryDataUnmount

[TibixDev]

Rebased on 5850a6cd and resolved the documentation conflict. App-content, working-directory and directory tests pass on Fedora 44 Release. The implementation is unchanged.

[TibixDev]

Rebased on bc1fbe81. Preserved upstream app-content and filesystem changes; mount behavior is unchanged.

Fedora 44 Release: guest_appcontent_tests, guest_working_directory_tests, guest_directory_tests build; the targeted tests and contribution checks pass. Windows CI is pending.

[adriadam10]

Checked the error codes and the mount/unmount/format/space-query state machine against fpPS4 sys_path.pas (BUSY on a second mount, NOT_MOUNTED for format/space/unmount without a mount, PARAMETER for an unknown option): they match. guest_app_content fails without the change and the full ctest passes (442/442) on the rebase.

It conflicted with main only by adjacency (RecordWrittenPath/SyncWrittenPaths next to BlockPathAlias in General.hpp/.cpp, and Mount2 in Export.cpp). I rebased and kept both, including the RecordWrittenPath on directory creation. Merging once CI is green on the rebased head.

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
#1524	docs/dev/TechnicalDebt.md L322
#1526	docs/dev/TechnicalDebt.md L322
#1535	docs/dev/TechnicalDebt.md L322