> A root-owned file won't be accessible to sandboxed applications such as Firefox running under Flatpak.
I would imagine something like this:
1. Extend adduser to ask for the user's date of birth. (GUI installers/tool would have to ask for this extra field too.) 2. Generate root-owned file containing the birth day, as suggested. 3. Regenerate a root-owned, user-readable (non-writeable) file containing the user's "age bracket" once per day via cron. The path & its format (e.g. "UNDER_13") would be the API. Alternatively, to make it more portable, a script get-age-bracket could be provided. 4. Making the file/script available to sandboxes is a matter of configuration. I don't think XDG is a good place to implement this. PS: While I think introducing some *optional* tools to make it easier for parents to set up some parental controls is a good thing, I don't support the legislation. Based on quick reading of the Californian bill (not a lawyer, not a native speaker), I think it would actually affect the root/admin user too, which leads to absurd results on Unix-like systems, among many other flaws. Not providing the OS at all for such jurisdictions would be the preferred course of action in my eyes, but I understand that's sadly not a practical option for many.
