From bed1b15096000e4eb4d48747b0bd3ca6d5ec5db2 Mon Sep 17 00:00:00 2001
From: David-cmrg <202826622+David-cmrg@users.noreply.github.com>
Date: Mon, 12 Oct 2026 20:10:03 +0200
Subject: [PATCH] fix(libkernel): create /data at start-up

---
 .../prx/libkernel/AppMetadata/src/AppMetadata.cpp     | 11 +++++++++++
 core/libs/prx/libkernel/CMakeLists.txt                |  6 ++++--
 core/libs/tests/GuestDownloadDataMount.cpp            |  4 ++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/core/libs/prx/libkernel/AppMetadata/src/AppMetadata.cpp b/core/libs/prx/libkernel/AppMetadata/src/AppMetadata.cpp
index 79df79827..8bf4cbc2d 100644
--- a/core/libs/prx/libkernel/AppMetadata/src/AppMetadata.cpp
+++ b/core/libs/prx/libkernel/AppMetadata/src/AppMetadata.cpp
@@ -54,6 +54,17 @@ const bool g_downloadDataMounted = [] {
     }
 }();
 
+const bool g_dataMounted = [] {
+    try {
+        const auto run = std::filesystem::current_path();
+        if (!std::filesystem::exists(run / "app0" / "sce_sys" / "param.json")) return false;
+        std::filesystem::create_directories(run / "data");
+        return true;
+    } catch (const std::exception&) {
+        return false;
+    }
+}();
+
 void ensureIconLoaded() {
     if (g_iconAttempted) return;
     g_iconAttempted = true;
diff --git a/core/libs/prx/libkernel/CMakeLists.txt b/core/libs/prx/libkernel/CMakeLists.txt
index 62cc6ef66..8b7a5ba61 100644
--- a/core/libs/prx/libkernel/CMakeLists.txt
+++ b/core/libs/prx/libkernel/CMakeLists.txt
@@ -82,12 +82,14 @@ if(BUILD_TESTING)
     target_include_directories(download_data_mount_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(download_data_mount_tests PRIVATE libkernel libc)
     configure_windows_unwind(download_data_mount_tests)
-    foreach(downloadDataCase IN ITEMS declared:256 none:0 invalid:256)
+    foreach(downloadDataCase IN ITEMS declared:256 none:0 invalid:256 missing:0)
         string(REPLACE ":" ";" downloadDataCase ${downloadDataCase})
         list(GET downloadDataCase 0 downloadDataName)
         list(GET downloadDataCase 1 downloadDataSize)
         set(downloadDataRun ${CMAKE_CURRENT_BINARY_DIR}/download_data_mount_${downloadDataName})
-        if(downloadDataName STREQUAL "invalid")
+        if(downloadDataName STREQUAL "missing")
+            file(MAKE_DIRECTORY ${downloadDataRun})
+        elseif(downloadDataName STREQUAL "invalid")
             file(WRITE ${downloadDataRun}/app0/sce_sys/param.json "{\"downloadDataSize\":${downloadDataSize}}")
         else()
             file(WRITE ${downloadDataRun}/app0/sce_sys/param.json
diff --git a/core/libs/tests/GuestDownloadDataMount.cpp b/core/libs/tests/GuestDownloadDataMount.cpp
index e588f786d..a3ebfccef 100644
--- a/core/libs/tests/GuestDownloadDataMount.cpp
+++ b/core/libs/tests/GuestDownloadDataMount.cpp
@@ -11,6 +11,10 @@ int main(int argc, char** argv) {
     Require(argc == 2);
     const std::string_view mode = argv[1];
     Require(std::filesystem::is_directory("download0") == (mode == "declared"));
+    const bool data = std::filesystem::is_directory("data");
+    std::filesystem::remove_all("data");
+    Require(data == (mode != "missing"));
+    if (mode == "missing") return 0;
     if (mode == "invalid") {
         bool rejected = false;
         try {