I skated nearly everyday from age 12-15, then sporadically after that. At around age 30 I was feeling the urge and got a new board. I was at the skatepark wondering if I’m getting too old until I met this guy in his late 40s who had just started a year earlier. Dude had a helmet, knee pads, and shorts with padding on his ass, but had gotten decent at carving the bowl and was trying new shit all the time. He definitely kept me skating longer than I would have otherwise. Though injuries take so long to heal now and being older than a scooter kid’s parent is weird.

Reality is that which, when you stop believing in it, doesn’t go away.

-PKD

Did you run garbage collection?

Just in case you (understandably) missed this concept “deleting” a generation does not remove package files from the nix store, they are just no longer referenced by the environment of your new configuration. Garbage collection (GC) can be run manually or set to run periodically to actually remove unreferenced files from the nix store. This is pretty nice when iterating on some package as you can make a change, rebuild, then if you change your mind instantly go back to some prior version without rebuilding or redownloading dependencies, and just let GC clean up for you later.

If you’re on a system where you’re really worried about disk space down to the relatively small size that extra package versions might use maybe nixos isn’t the best choice. One could setup and build the configuration for a disk space constrained system on another larger system, though the nix learning curve is steep enough without navigating the multiple ways to do that while learning.

OTOH, it might be that some other package in your config, possibly nix itself, depends on git (to get the packages) and that’s what you’re seeing in the store. This version should not interfere with anything in your user environment, e.g. if you want to install some alternative version of git or something (I don’t know why you want to remove git).

wl-gammarelay-rs has worked for me. This is a daemon controlled through dbus, but there are some applets listed in the readme as well as a script in the repo for adjusting based on the time of day.

Anathem came to mind for me. Each reply naming a different book is pretty funny.