On Di, 03.05.22 13:55, Jason A. Donenfeld (Jason@xxxxxxxxx) wrote: > I'm still not convinced there's value in having a counter or a UUID, but > if you had to choose, would you prefer a counter or a UUID? It sounds > like the former, because you see a use for distinguishing between zero > and non-zero? Or did you finally agree with me that vmgenid isn't > granular enough for that? I would prefer a monotonic counter, since it allows answering questions like the following: 1. Did this image get cloned at all? (i.e. counter != 0; usecase as per the MAC address discussion) 2. Did the image get cloned since the last time I looked? (i.e. counter != my_previously_saved_counter; usecase: detect clones in an "offline" fashion, i.e. from a component that doesn't continously run, but only from time to time) 3. How many clones did I miss? (i.e. missed_clones = my_previously_saved_counter - counter; usecase: catch up with generating proxy D-Bus signal messages for clones). There might be more. Using a UUID would not give us #1 or #3. It would deliver #2 however. Lennart -- Lennart Poettering, Berlin
