Make layer labels starting with the "pebble-" prefix reserved

[rebornplusplus]

Following the discussions from #191 (comment), consider making any layer labels starting with the pebble- prefix reserved.

[barrettj12]

@aliamerj easy one for you to start on

[aliamerj]

Hello, i am working on this issue , i just need some clarification

• Could you please provide more details on what "reserving" labels with "pebble-" prefix entails? Are we preventing users from creating such labels? Or is it about some internal logic?

• Scope: Is the reservation of "pebble-" prefixed labels only applicable to certain parts of the Pebble system, or is it universally across all features?

• Case Sensitivity: Is the "pebble-" prefix case-sensitive? Should I treat "Pebble-" the same as "pebble-" when implementing this feature?

[barrettj12]

Hi @aliamerj, reserving the label means the user shouldn't be able to create a layer with that label. i.e. label names of the form nnn-pebble-* are disallowed.

There is currently code in the plan package which checks for e.g. reserved service names - just add a check for reserved labels, and a corresponding unit test.

I think just handle the lowercase version pebble-, don't worry about other cases.