How can I force to ask default Workspace like eclipse with theia?

I want to show ‘open workspace’ dialog before it starts.
And after setting workspace path, I want to restrict creating folders or files only in the workspace path.
How can I do this?
Plz help!

[original thread by Dawoon Jeong]

after setting workspace path, I want to restrict creating folders or files only in the workspace path

This might be difficult to achieve with Theia alone.

e.g. one can always use the terminal to navigate and create files/folders wherever the filesystem permissions permit