Given that states and countries are now requiring that operating systems report the age of users, it is important that BusyBox be able to comply. Why? BusyBox is used in embedded devices that qualify for regulation under these bills (such as California's AB-1043). For most hardware, this would actually amount to just reporting epoc for root, as most devices won't directly have users. Applications on those may, but those usually have their own user management features.

This patch adds the -b option to BusyBox's adduser, and will record a birthday in YYYYMMDD format. This can then be used to determine age, and/or the age bracket of the user via the standard UNIX shell which serves as the UNIX API/ABI, and thus makes BusyBox compliant with the law. The two UNIX commands added here are howoldami and useragerange.