Make OpenDirectory fail if the directory doesn't exist

This is in line with what the hardware itself does.

It does this by splitting the initial directory opening into Directory.Open(), which will return false if a stat fails.
Then, Archive::OpenDirectory will return nullptr, and archive.cpp will return an error code .

7 files changed, 40 insertions, 3 deletions

diff --git a/src/core/file_sys/archive_sdmc.cpp b/src/core/file_sys/archive_sdmc.cpp
index 169ab0f1c..fc0b9b72d 100644
--- a/src/core/file_sys/archive_sdmc.cpp
+++ b/src/core/file_sys/archive_sdmc.cpp
@@ -100,6 +100,8 @@ bool Archive_SDMC::RenameDirectory(const FileSys::Path& src_path, const FileSys:
 std::unique_ptr<Directory> Archive_SDMC::OpenDirectory(const Path& path) const {
     DEBUG_LOG(FILESYS, "called path=%s", path.DebugStr().c_str());
     Directory_SDMC* directory = new Directory_SDMC(this, path);
+    if (!directory->Open())
+        return nullptr;
     return std::unique_ptr<Directory>(directory);
 }
 
diff --git a/src/core/file_sys/directory.h b/src/core/file_sys/directory.h
index e10431337..1bb4101d6 100644
--- a/src/core/file_sys/directory.h
+++ b/src/core/file_sys/directory.h
@@ -42,6 +42,12 @@ public:
     virtual ~Directory() { }
 
     /**
+    * Open the directory
+    * @return true if the directory opened correctly
+    */
+    virtual bool Open() = 0;
+
+    /**
      * List files contained in the directory
      * @param count Number of entries to return at once in entries
      * @param entries Buffer to read data into
diff --git a/src/core/file_sys/directory_romfs.cpp b/src/core/file_sys/directory_romfs.cpp
index 4e8f4c04d..e6d571391 100644
--- a/src/core/file_sys/directory_romfs.cpp
+++ b/src/core/file_sys/directory_romfs.cpp
@@ -17,6 +17,10 @@ Directory_RomFS::Directory_RomFS() {
 Directory_RomFS::~Directory_RomFS() {
 }
 
+bool Directory_RomFS::Open() {
+    return false;
+}
+
 /**
  * List files contained in the directory
  * @param count Number of entries to return at once in entries
diff --git a/src/core/file_sys/directory_romfs.h b/src/core/file_sys/directory_romfs.h
index 4b71c4b13..e2944099e 100644
--- a/src/core/file_sys/directory_romfs.h
+++ b/src/core/file_sys/directory_romfs.h
@@ -20,6 +20,12 @@ public:
     ~Directory_RomFS() override;
 
     /**
+    * Open the directory
+    * @return true if the directory opened correctly
+    */
+    bool Open() override;
+
+    /**
      * List files contained in the directory
      * @param count Number of entries to return at once in entries
      * @param entries Buffer to read data into
diff --git a/src/core/file_sys/directory_sdmc.cpp b/src/core/file_sys/directory_sdmc.cpp
index 60a197ce9..0f156a127 100644
--- a/src/core/file_sys/directory_sdmc.cpp
+++ b/src/core/file_sys/directory_sdmc.cpp
@@ -19,15 +19,22 @@ Directory_SDMC::Directory_SDMC(const Archive_SDMC* archive, const Path& path) {
     // TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
     // the root directory we set while opening the archive.
     // For example, opening /../../usr/bin can give the emulated program your installed programs.
-    std::string absolute_path = archive->GetMountPoint() + path.AsString();
-    FileUtil::ScanDirectoryTree(absolute_path, directory);
-    children_iterator = directory.children.begin();
+    this->path = archive->GetMountPoint() + path.AsString();
+
 }
 
 Directory_SDMC::~Directory_SDMC() {
     Close();
 }
 
+bool Directory_SDMC::Open() {
+    if (!FileUtil::IsDirectory(path))
+        return false;
+    FileUtil::ScanDirectoryTree(path, directory);
+    children_iterator = directory.children.begin();
+    return true;
+}
+
 /**
  * List files contained in the directory
  * @param count Number of entries to return at once in entries
diff --git a/src/core/file_sys/directory_sdmc.h b/src/core/file_sys/directory_sdmc.h
index 4520d0401..4c08b0d61 100644
--- a/src/core/file_sys/directory_sdmc.h
+++ b/src/core/file_sys/directory_sdmc.h
@@ -23,6 +23,12 @@ public:
     ~Directory_SDMC() override;
 
     /**
+    * Open the directory
+    * @return true if the directory opened correctly
+    */
+    bool Open() override;
+
+    /**
      * List files contained in the directory
      * @param count Number of entries to return at once in entries
      * @param entries Buffer to read data into
@@ -37,6 +43,7 @@ public:
     bool Close() const override;
 
 private:
+    std::string path;
     u32 total_entries_in_directory;
     FileUtil::FSTEntry directory;
 
diff --git a/src/core/hle/kernel/archive.cpp b/src/core/hle/kernel/archive.cpp
index 647f0dea9..a875fa7ff 100644
--- a/src/core/hle/kernel/archive.cpp
+++ b/src/core/hle/kernel/archive.cpp
@@ -421,6 +421,11 @@ ResultVal<Handle> OpenDirectoryFromArchive(Handle archive_handle, const FileSys:
     directory->path = path;
     directory->backend = archive->backend->OpenDirectory(path);
 
+    if (!directory->backend) {
+        return ResultCode(ErrorDescription::NotFound, ErrorModule::FS,
+                          ErrorSummary::NotFound, ErrorLevel::Permanent);
+    }
+
     return MakeResult<Handle>(handle);
 }