[Nix-dev] Running `nixos-install` creates new generations inside `/mnt`

[Roger Qiu]

Hi,

Since I was debugging a number of issues with my configuration on the 
live ISO, I was running `nixos-install` multiple times. Every time I did 
this, and the configuration change caused a change in the initrd, this 
resulted in a new generation. Eventually I ran out of `/boot` space 
(this was on an ESP using gummiboot).

So what's the point of having `nixos-install` create new generations, 
there's no way to change generations or garbage collect generations 
inside `/mnt`? My suggestion would to be make it so that `nixos-install` 
never creates new generations, and always starts as if it only has 1 
generation. It would make it truly idempotent.

Thanks,
Roger

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