RageFileManager::Remount

stepmania/src/RageFileDriver.h

@@ -23,6 +23,9 @@ public:
 	virtual void FlushDirCache( const CString &sPath );
 	virtual bool Remove( const CString &sPath ) { return false; }
 
+	/* Optional: Move to a different place, as if reconstructed with a different path. */
+	virtual bool Remount( const CString &sPath ) { return false; }
+
 	/* Possible error returns from Open, in addition to standard errno.h values: */
 	enum { ERROR_WRITING_NOT_SUPPORTED = -1 };
 // protected:

stepmania/src/RageFileDriverDirect.cpp

@@ -54,14 +54,9 @@ public:
 
 
 RageFileDriverDirect::RageFileDriverDirect( CString root_ ):
-	RageFileDriver( new DirectFilenameDB(root_) ),
-	root(root_)
+	RageFileDriver( new DirectFilenameDB(root_) )
 {
-	if( root.Right(1) != "/" )
-		root += '/';
-
-	/* If the root path doesn't exist, create it. */
-	CreateDirectories( root );
+	Remount( root_ );
 }
 
 
@@ -176,6 +171,18 @@ bool RageFileDriverDirect::Ready()
 	return PathReady( root );
 }
 
+bool RageFileDriverDirect::Remount( const CString &sPath )
+{
+	root = sPath;
+	if( root.Right(1) != "/" )
+		root += '/';
+
+	/* If the root path doesn't exist, create it. */
+	CreateDirectories( root );
+
+	return true;
+}
+
 static const unsigned int BUFSIZE = 1024*64;
 RageFileObjDirect::RageFileObjDirect( const CString &path_, int fd_, int mode_ )
 {

stepmania/src/RageFileDriverDirect.h

@@ -11,6 +11,7 @@ public:
 	RageFileBasic *Open( const CString &path, int mode, int &err );
 	bool Remove( const CString &sPath );
 	bool Ready();
+	bool Remount( const CString &sPath );
 
 private:
 	CString root;

stepmania/src/RageFileManager.cpp

@@ -498,6 +498,22 @@ void RageFileManager::Unmount( CString Type, CString Root, CString MountPoint )
 	}
 }
 
+void RageFileManager::Remount( CString sMountpoint, CString sPath )
+{
+	RageFileDriver *pDriver = FILEMAN->GetFileDriver( sMountpoint );
+	if( pDriver == NULL )
+	{
+		LOG->Warn( "Remount(%s,%s): mountpoint not found",
+			sMountpoint.c_str(), sPath.c_str() );
+		return;
+	}
+
+	if( !pDriver->Remount(sPath) )
+		LOG->Warn( "Remount(%s,%s): remount failed (does the driver support remounting?)" );
+
+	FILEMAN->ReleaseFileDriver( pDriver );
+}
+
 bool RageFileManager::IsMounted( CString MountPoint )
 {
 	LockMut( *g_Mutex );

stepmania/src/RageFileManager.h

@@ -34,6 +34,11 @@ public:
 
 	void Mount( CString Type, CString RealPath, CString MountPoint );
 	void Unmount( CString Type, CString Root, CString MountPoint );
+
+	/* Change the root of a filesystem.  Only a couple drivers support this; it's
+	 * used to change memory card mountpoints without having to actually unmount
+	 * the driver. */
+	static void Remount( CString sMountpoint, CString sPath );
 	bool IsMounted( CString MountPoint );
 	bool MountpointIsReady( CString MountPoint );
 	struct DriverLocation