Trying to learn about snapper / systemd-boot

Hi!

I’m trying to learn more about snapper and systemd boot, mainly by creating the subvolumes/setting up snapper myself by hand, which I’ve done fairly successfully so far, I was just wondering a couple of things:

  • What changes the default sub volume passed as a root flag in the loader .conf? Snapper doesn’t do it, is it a TW specific tool?
  • Incidentally, I thought systemd-boot couldn’t be customized, but on TW the selection highlight is green - where does this come from?

Thank you!