File storage location for ubuntu application

Question

In my application I plan to store files locally ( exported files ) and import files which user copy via USB to the disk. Where to locate such application files ? Is there some recomendation ?

Answer 1

If your application is designed to run under application confinement (usually required if you plan to ship through the click store), it will be restricted to access files only within its own silo. Files you wish to store permanently should be stored in .local/share/<appid>. <appid> is the unique string identifying your application, showing up as the applicationName in your MainView (if you're using QML) and the "Package path" in the click store. (Why yes, let's give this thing a few different names!)

If you're not worried about these restrictions, you can place the files anywhere. If these are files which the user shouldn't have to worry about, you should follow the XDG Base Directory Specification. (Brief summary: configuration files in ~/.config/, data files in ~/.local/share/.) If these are files that the user may want to access directly, I feel you ought to let the user choose where they get stored.