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nix-super/doc/manual/src/installation/upgrading.md
Valentin Gagarin fe751fbde2 don't show channels in upgrade instructions 
channels make everything more stateful, and therefore more complicated
and potentially confusing, but aren't needed for this task, so don't encourage their use.
2024-01-07 01:07:11 +01:00

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Upgrading Nix

Note

These upgrade instructions apply where Nix was installed following the installation instructions in this manual.

Check which Nix version will be installed, for example from one of the release channels such as nixpkgs-unstable:

$ nix-shell -p nix -I nixpkgs=channel:nixpkgs-unstable --run "nix --version"
nix (Nix) 2.18.1

Warning

Writing to the local store with a newer version of Nix, for example by building derivations with nix-build or nix-store --realise, may change the database schema! Reverting to an older version of Nix may therefore require purging the store database before it can be used.

Linux multi-user

$ sudo su
# nix-env --install --file '<nixpkgs>' --attr nix cacert -I nixpkgs=channel:nixpkgs-unstable
# systemctl daemon-reload
# systemctl restart nix-daemon

macOS multi-user

$ sudo nix-env --install --file '<nixpkgs>' --attr nix -I nixpkgs=channel:nixpkgs-unstable
$ sudo launchctl remove org.nixos.nix-daemon
$ sudo launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist

Single-user all platforms

$ nix-env --install --file '<nixpkgs>' --attr nix cacert -I nixpkgs=channel:nixpkgs-unstable