Vladimír Čunát <vcu...@gmail.com> writes: > On 05/18/2017 08:32 PM, Stefan Huchler wrote:
>> The first question is why do I need to specify a path and use a nix tool >> when I want to make nixos system rollback? searching this path always is not >> very funny. > > You don't need to. You can run just `nix-env --rollback` repeatedly to > get to the generation you want. Note that it's just a linear list; that > might have "confusing consequences" when you alternate appending items > with rollbacks. with nix-env --list-generations I get that 15-19 generation stuff so nix-env rollback would operate on that right? So I need to give the system-path to operate on... to take actions on it. I dont see how to get around that... Also repetingly do --rollback 10 times is no good option in my oppinion... giving a number as parameter makes more sense to me... which works for nix-channel --rollback but not for nix-env --rollback which is inconsistent. >> Why cant I use some sort of nixos-env --delete-generations without a >> path? And why cant I use like with nix-channel not 198 as parameter to >> rollback instead of using switch + delete manually? > > If you want to delete all but the current generation or similar actions, > there's `nix-collect-garbage -d` (see docs for more details). delete older does not help when I want to go back... I would need some sort of --delete-newer-than... > Channels have an independent list of generations, "unrelated" to the > generations of installed stuff (nix-env --list-generations). Anyway, > you probably want to remove the 17.03 URL, replace it, and run channel > update. Yes that is what I did... still the need of writing the path to the system-profile is dumb in my oppinion... make some sort of --system switch or something... Its just some guessing and trying around thinking that I might need still a backup of the system... cause there seems so much you can make wrong. Sorry maybe I am nidpicking... I dont want to whine but maybe somebody sees that as good feedback for improvements. make a nix-env --system or nixos-env tool that operates on the os-level, or integrate --rollback in nixos-rebuild and rename it maybe to nixos-ctl or something like that. > --Vladimir > > P.S. > I personally often like to hand-manage this stuff, as the commands are > just a rather thin layer around the underlying files. > $HOME/.nix-channels is a really trivial list. Profiles are simple > symlinks. It's often easier for me to use standard tools for > manipulation with files and text files. At least I know I did not start a atomic missle and it was kind of correct what I did, even it feeled very strange... _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl https://mailman.science.uu.nl/mailman/listinfo/nix-dev