After a fresh installation using NixOps, I conected to the machine and ran
# nix-channel --updateThat downloaded ~150Mb of nixpkgs to my /nix/store. How do I reverse this?
Reversing a `nix-channel --update`
The conversation continues 2
kayak Permalink For an ordinary Nix or NixOS installation, an accidental channel update using
nix-channel --updatecan be reversed with this commandnix-channel --rollbackThe manual (http://nixos.org/nix/manual/#sec-nix-channel) has additional details.
With NixOps, the channels exist in the configuration but aren't used. The alternative answer (https://stackoverflow.com/a/39108713/582) discusses that case.
Ola Permalink With a NixOps setup, channels appear to be configured without NixOps actually using them. Consequently,
nix-channel --updatemakes an initial generation, andnix-channel --rollbackcannot help because there isn't an earlier generation to return to.This appears to remove that information successfully.
Never use this with ordinary Nix or NixOS installations! It applies only to NixOps.
rm /nix/var/nix/profiles/per-user/root/channels-1-link rm /nix/var/nix/profiles/per-user/root/channels rm ~/.nix-defexpr/channels nix-collect-garbage -d
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