Fluorine Manager: full Linux port of Mod Organizer 2

Complete native Linux port with FUSE-based virtual filesystem,
Proton/umu-run integration, and Flatpak packaging.

Key features:
- FUSE VFS replacing Windows USVFS (in-process + standalone helper for Flatpak)
- Proton/GE-Proton/umu-run launcher with env var forwarding
- Flatpak support (sandbox-aware VFS, NXM handler, umu-run)
- Wine prefix management UI
- Case-insensitive path resolution for Linux filesystems
- QSettings-safe INI handling (avoids Bethesda INI corruption)
- Portable instance support with auto-generated launcher scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

130 files changed, 286 insertions, 0 deletions

diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/data/file.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/data/file.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/data/file.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/empty/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/empty/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/empty/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/readme.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/readme.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/expected/mods/mod1/readme.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/data/file.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/data/file.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/data/file.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/empty/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/empty/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/empty/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/info.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/info.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/info.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/readme.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/readme.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BasicTest/source/mods/mod1/readme.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/data/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/data/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/data/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/subdocs/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/subdocs/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/expected/mods/mod1/docs/subdocs/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/data/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/data/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/data/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/subdocs/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/subdocs/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/BoostFilesystemTest/source/mods/mod1/docs/subdocs/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/example.cpp b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/example.cpp
new file mode 100644
index 0000000..9a79d16
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/example.cpp
@@ -0,0 +1,139 @@
+#include <filesystem>
+#include <fstream>
+
+std::filesystem::path storages_path;
+std::filesystem::path hudpainter_path;
+bool has_mo2;
+
+// See below main() for implementation.
+void request_directory(std::filesystem::path);
+std::filesystem::path restrict_path(std::filesystem::path);
+std::vector<std::filesystem::path> get_files();
+std::string read_file(std::filesystem::path);
+void write_file(std::filesystem::path);
+
+// Expected path when not using MO2
+int main()
+{
+  // RedFileSystem plugin (DLL) is loaded.
+  has_mo2 = GetModuleHandle(TEXT("usvfs_x64.dll")) != nullptr;
+
+  // Setup paths
+  auto path      = std::filesystem::absolute(".");    // <GAME>\bin\x64
+  auto game_path = path.parent_path().parent_path();  // <GAME>
+
+  storages_path = game_path / "r6" / "storages";  // <GAME>\r6\storages
+
+  // Create storages directory if it is no present.
+  request_directory(storages_path);  // <GAME>\r6\storages
+
+  // Game is running...
+
+  // HUD Painter request its storage endpoint.
+  hudpainter_path = storages_path / "HUDPainter";
+  request_directory(hudpainter_path);  // <GAME>\r6\storages\HUDPainter
+
+  // HUD Painter request a file (present in archive).
+  auto default_path =
+      restrict_path("DEFAULT.json");  // <GAME>\r6\storages\HUDPainter\DEFAULT.json
+
+  // HUD Painter read file in `default_path` with success.
+  auto data = read_file(default_path);  // <GAME>\r6\storages\HUDPainter\DEFAULT.json
+
+  // HUD Painter request another file.
+  auto test_path =
+      restrict_path("TEST.json");  // <GAME>\r6\storages\HUDPainter\TEST.json
+
+  // (Bug A) HUD Painter write file in `test_path`.
+  write_file(test_path);  // <GAME>\r6\storages\HUDPainter\TEST.json
+                          // file is created with workaround, not created otherwise.
+
+  // (Bug B) HUD Painter request list of files.
+  //         TEST.json is successfully created when using workaround.
+  auto files = get_files();  // [0] <GAME>\r6\storages\HUDPainter\DEFAULT.json
+
+  // files.size() == 1
+
+  // Expect:
+  // files.size() == 2
+  //
+  // [0] <GAME>\r6\storages\HUDPainter\DEFAULT.json
+  // [1] <GAME>\r6\storages\HUDPainter\TEST.json
+}
+
+// Create directory if it is no present
+void request_directory(std::filesystem::path path)
+{
+  bool is_present = std::filesystem::exists(path);
+
+  if (is_present) {
+    return;
+  }
+  std::filesystem::create_directory(path);
+}
+
+// Resolve path for HUDPainter (security layer)
+std::filesystem::path restrict_path(std::filesystem::path path)
+{
+  auto real_path = std::filesystem::weakly_canonical(hudpainter_path / path);
+
+  // Workaround when using MO2
+  if (has_mo2) {
+    return real_path;
+  }
+  // Expected implementation without MO2
+  if (real_path.string().find(hudpainter_path.string() + "\\") != 0) {
+    // "throw" error
+  }
+  return real_path;
+}
+
+// List files in storage of HUDPainter.
+std::vector<std::filesystem::path> get_files()
+{
+  std::vector<std::filesystem::path> files;
+  auto entries = std::filesystem::directory_iterator(hudpainter_path);
+
+  for (const auto& entry : entries) {
+    if (entry.is_regular_file()) {
+      auto file_name = entry.path().filename();
+      auto file_path =
+          hudpainter_path /
+          file_name;  // Culprit of bug B. When using entry.path() directly, it works.
+
+      files.emplace_back(file_path);
+    }
+  }
+  return files;
+}
+
+std::string read_file(std::filesystem::path path)
+{
+  std::ifstream stream;
+
+  // With workaround:
+  // std::filesystem::create_directories(path.parent_path());
+  stream.open(path);
+  if (!stream.is_open()) {
+    return "";
+  }
+  std::stringstream data;
+
+  data << stream.rdbuf();
+  stream.close();
+  return data.str();
+}
+
+void write_file(std::filesystem::path path)
+{
+  std::ofstream stream;
+
+  // With workaround:
+  // std::filesystem::create_directories(path.parent_path());
+  stream.open(path, std::ios_base::trunc);
+  if (!stream.is_open()) {
+    return;
+  }
+  stream << "<DATA>";
+  stream.close();
+}
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/data/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
new file mode 100644
index 0000000..dd85d0a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
@@ -0,0 +1,11 @@
+{
+  "propertiesDefault": [
+    {
+      "name": "MainColors.Red",
+      "red": 1.1761,
+      "green": 0.3809,
+      "blue": 0.3476,
+      "alpha": 1
+    }
+  ]
+}
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/expected/overwrite/r6/storages/HUDPainter/TEST.json
@@ -0,0 +1 @@
+{}
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/data/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/data/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/data/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
new file mode 100644
index 0000000..dd85d0a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/RedFileSystemTest/source/mods/HUD Painter/r6/storages/HUDPainter/DEFAULT.json
@@ -0,0 +1,11 @@
+{
+  "propertiesDefault": [
+    {
+      "name": "MainColors.Red",
+      "red": 1.1761,
+      "green": 0.3809,
+      "blue": 0.3476,
+      "alpha": 1
+    }
+  ]
+}
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/docs/doc.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/docs/doc.skip
new file mode 100644
index 0000000..09a24fd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/docs/doc.skip
@@ -0,0 +1 @@
+doc.skip in data/docs
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/file.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/file.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/data/file.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.skip
new file mode 100644
index 0000000..4b8bde6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.skip
@@ -0,0 +1 @@
+doc.skip in mod1/docs
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/empty/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/empty/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/empty/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.skip
new file mode 100644
index 0000000..1d1857a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.skip
@@ -0,0 +1 @@
+readme.skip in mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/mods/mod1/readme.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/overwrite/readme.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/overwrite/readme.skip
new file mode 100644
index 0000000..0062dba
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/expected/overwrite/readme.skip
@@ -0,0 +1 @@
+readme.skip in overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/docs/doc.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/docs/doc.skip
new file mode 100644
index 0000000..09a24fd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/docs/doc.skip
@@ -0,0 +1 @@
+doc.skip in data/docs
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/file.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/file.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/data/file.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.skip
new file mode 100644
index 0000000..4b8bde6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.skip
@@ -0,0 +1 @@
+doc.skip in mod1/docs
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/docs/doc.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/empty/.gitkeep b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/empty/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/empty/.gitkeep
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.skip b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.skip
new file mode 100644
index 0000000..1d1857a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.skip
@@ -0,0 +1 @@
+readme.skip in mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.txt b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_global_test/SkipFilesTest/source/mods/mod1/readme.txt
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt
new file mode 100644
index 0000000..9830306
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfile0.txt
@@ -0,0 +1 @@
+rfolder\rfile0.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt
new file mode 100644
index 0000000..2743678
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfiledeletewrite.txt
@@ -0,0 +1 @@
+rfolder\rfiledeletewrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt
new file mode 100644
index 0000000..bdff476
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/rfolder/rfilerewrite.txt
@@ -0,0 +1 @@
+rfolder\rfilerewrite.txt rewrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt
new file mode 100644
index 0000000..a52b6be
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0.txt
@@ -0,0 +1 @@
+root0 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt
new file mode 100644
index 0000000..c177584
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root0w.txt
@@ -0,0 +1 @@
+root0w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt
new file mode 100644
index 0000000..06dc692
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1.txt
@@ -0,0 +1 @@
+root1 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt
new file mode 100644
index 0000000..45172aa
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount.postmortem/root1w.txt
@@ -0,0 +1 @@
+root1w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt
new file mode 100644
index 0000000..9830306
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfile0.txt
@@ -0,0 +1 @@
+rfolder\rfile0.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt
new file mode 100644
index 0000000..c19828f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledelete.txt
@@ -0,0 +1 @@
+rfolder\rfiledelete.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt
new file mode 100644
index 0000000..93861cc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfiledeletewrite.txt
@@ -0,0 +1 @@
+rfolder\rfiledeletewrite.txt orignal file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt
new file mode 100644
index 0000000..9376ea1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfileoldname.txt
@@ -0,0 +1 @@
+rfolder\rfileoldname.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt
new file mode 100644
index 0000000..499775d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/rfolder/rfilerewrite.txt
@@ -0,0 +1 @@
+rfolder\rfilerewrite.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt
new file mode 100644
index 0000000..a52b6be
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0.txt
@@ -0,0 +1 @@
+root0 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt
new file mode 100644
index 0000000..c177584
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root0w.txt
@@ -0,0 +1 @@
+root0w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt
new file mode 100644
index 0000000..06dc692
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1.txt
@@ -0,0 +1 @@
+root1 original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt
new file mode 100644
index 0000000..45172aa
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/mount/root1w.txt
@@ -0,0 +1 @@
+root1w original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt
new file mode 100644
index 0000000..227256a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfile.txt
@@ -0,0 +1 @@
+mfolder1\mfile.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt
new file mode 100644
index 0000000..420589d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder1/mfilew.txt
@@ -0,0 +1 @@
+mfolder1\mfilew.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..6a7a0c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod1 (to be hidden by mod3)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt
new file mode 100644
index 0000000..7d5dc0e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1.txt
@@ -0,0 +1 @@
+hello mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt
new file mode 100644
index 0000000..1838cdf
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod1/mod1w.txt
@@ -0,0 +1 @@
+hello mod1w
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt
new file mode 100644
index 0000000..8ff096e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder2/mfile.txt
@@ -0,0 +1 @@
+mfolder2\mfile.txt by mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt
new file mode 100644
index 0000000..c0f0f2c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..e35f1f3
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cc572dc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..f699360
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..9eae9c5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..88a6d08
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..61b92a6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..727a48f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt
new file mode 100644
index 0000000..49bbbf1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod2/mod2.txt
@@ -0,0 +1 @@
+hello mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..fac8213
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt
new file mode 100644
index 0000000..5e6ca00
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod3 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt
new file mode 100644
index 0000000..47fbacd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod3/mod3.txt
@@ -0,0 +1 @@
+hello mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt
new file mode 100644
index 0000000..c67ecfe
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..00cc0cd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletemove.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..083a6b8
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletewrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..a8a93c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4\mfilemoveover.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..fc6d42f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..a3b8ced
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/mod4/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt rewrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/.empty
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt
new file mode 100644
index 0000000..bf76f1d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfile1.txt
@@ -0,0 +1 @@
+newfile1.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt
new file mode 100644
index 0000000..4802577
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder1/newfolder1/newfile1.txt
@@ -0,0 +1 @@
+newfile1.txt nonrecursive overwrite subfolder
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt
new file mode 100644
index 0000000..a4fa7fc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder2/newfile2.txt
@@ -0,0 +1 @@
+newfile2.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt
new file mode 100644
index 0000000..933eb0c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3.txt
@@ -0,0 +1 @@
+newfile3.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt
new file mode 100644
index 0000000..5e5286a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder3/newfolder3/newfile3e.txt
@@ -0,0 +1 @@
+newfile3e.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..6b85a92
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletemove2p.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..64cac84
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4\mfiledeletewrite2p.txt overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt
new file mode 100644
index 0000000..cba5361
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4.txt
@@ -0,0 +1 @@
+newfile4.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt
new file mode 100644
index 0000000..eb90089
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4e.txt
@@ -0,0 +1 @@
+newfile4e.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt
new file mode 100644
index 0000000..f8b5f9f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/e/p/newfile4enr.txt
@@ -0,0 +1 @@
+newfile4enr.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt
new file mode 100644
index 0000000..06edab8
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4.txt
@@ -0,0 +1 @@
+epnewfile4.txt nonrecursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt
new file mode 100644
index 0000000..8fd183d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4/d/e/epnewfile4r.txt
@@ -0,0 +1 @@
+epnewfile4r.txt recursive overwrite
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/newfolder4p/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt
new file mode 100644
index 0000000..d1e44e9
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/mfolder4/rcopyme4.txt
@@ -0,0 +1 @@
+rfolder\rcopyme4.txt original contents
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt
new file mode 100644
index 0000000..9376ea1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/overwrite/rfolder/rfilenewname.txt
@@ -0,0 +1 @@
+rfolder\rfileoldname.txt original file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt
new file mode 100644
index 0000000..5aa129b
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1.txt
@@ -0,0 +1 @@
+root1 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt
new file mode 100644
index 0000000..0c04aa5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root1w.txt
@@ -0,0 +1 @@
+root1w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt
new file mode 100644
index 0000000..4ac40bb
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2.txt
@@ -0,0 +1 @@
+root2 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt
new file mode 100644
index 0000000..83ddb42
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source.postmortem/root2w.txt
@@ -0,0 +1 @@
+root2w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt
new file mode 100644
index 0000000..227256a
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfile.txt
@@ -0,0 +1 @@
+mfolder1\mfile.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt
new file mode 100644
index 0000000..420589d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder1/mfilew.txt
@@ -0,0 +1 @@
+mfolder1\mfilew.txt by mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..6a7a0c2
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod1 (to be hidden by mod3)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt
new file mode 100644
index 0000000..7d5dc0e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1.txt
@@ -0,0 +1 @@
+hello mod1
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt
new file mode 100644
index 0000000..1838cdf
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod1/mod1w.txt
@@ -0,0 +1 @@
+hello mod1w
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt
new file mode 100644
index 0000000..8ff096e
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder2/mfile.txt
@@ -0,0 +1 @@
+mfolder2\mfile.txt by mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt
new file mode 100644
index 0000000..c0f0f2c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..e35f1f3
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cc572dc
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..f699360
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..9eae9c5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..88a6d08
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..61b92a6
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..727a48f
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod2 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt
new file mode 100644
index 0000000..49bbbf1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod2/mod2.txt
@@ -0,0 +1 @@
+hello mod2
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt
new file mode 100644
index 0000000..fac8213
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder3/mdeep3/mfile.txt
@@ -0,0 +1 @@
+mfolder3\mdeep3\mfile.txt by mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt
new file mode 100644
index 0000000..5e6ca00
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod3 (to be hidden by mod4)
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt
new file mode 100644
index 0000000..47fbacd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod3/mod3.txt
@@ -0,0 +1 @@
+hello mod3
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt
new file mode 100644
index 0000000..c67ecfe
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfile.txt
@@ -0,0 +1 @@
+mfolder4\mfile.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt
new file mode 100644
index 0000000..657f07d
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt
new file mode 100644
index 0000000..cfd08dd
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletemove2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletemove2p.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt
new file mode 100644
index 0000000..a17d129
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt
new file mode 100644
index 0000000..b198d1c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfiledeletewrite2p.txt
@@ -0,0 +1 @@
+mfolder4/mfiledeletewrite2p.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt
new file mode 100644
index 0000000..b395908
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilemoveover.txt
@@ -0,0 +1 @@
+mfolder4/mfilemoveover.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt
new file mode 100644
index 0000000..405c0c1
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfileoverwrite.txt
@@ -0,0 +1 @@
+mfolder4\mfileoverwrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt
new file mode 100644
index 0000000..def973c
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/mod4/mfolder4/mfilerewrite.txt
@@ -0,0 +1 @@
+mfolder4\mfilerewrite.txt by mod4
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty b/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/overwrite/.empty
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt
new file mode 100644
index 0000000..5aa129b
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1.txt
@@ -0,0 +1 @@
+root1 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt
new file mode 100644
index 0000000..0c04aa5
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root1w.txt
@@ -0,0 +1 @@
+root1w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt
new file mode 100644
index 0000000..4ac40bb
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2.txt
@@ -0,0 +1 @@
+root2 source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt
new file mode 100644
index 0000000..83ddb42
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/source/root2w.txt
@@ -0,0 +1 @@
+root2w source file
diff --git a/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt b/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt
new file mode 100644
index 0000000..cc755b4
--- /dev/null
+++ b/libs/usvfs/test/fixtures/usvfs_test/basic/vfs_mappings.txt
@@ -0,0 +1,26 @@
+# mapdir <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapdir
+  mod1
+  mod2
+  mod3
+  mod4
+
+# mapdircreate <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapdircreate
+  overwrite
+
+# mapfile <optional relative path under mount>
+#   <relative path under source to mount>
+#   ...
+mapfile root1.txt
+  root1.txt
+mapfile root1w.txt
+  root1w.txt
+mapfile root2.txt
+  root2.txt
+mapfile root2w.txt
+  root2w.txt