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In the multi-user install script, we originally made sure no previous references to Nix existed. This prevented any previous installs from contaminating the new install. However, some users need the ability to repair their existing Nix installation without uninstalling all references to Nix. This change allows users with existing Nix installations to use the installer, while still outputing a warning message on the dangers of this. As a result, the multi-user install script work much more like the single-user install script has worked in the past. This is a requirement for macOS Catalina users now that /Library/LaunchDaemons/org.nixos.nix-daemon.plisg is not managed by the Nix store. If there is ever a change to the .plist, all users will need to rerun this install script to get the new changes. Otherwise, changes to the launch daemon will require manual interventions.
Nix, the purely functional package manager
Nix is a new take on package management that is fairly unique. Because of its purity aspects, a lot of issues found in traditional package managers don't appear with Nix.
To find out more about the tool, usage and installation instructions, please read the manual, which is available on the Nix website at http://nixos.org/nix/manual.
Contributing
Take a look at the Hacking Section of the manual. It helps you to get started with building Nix from source.
License
Nix is released under the LGPL v2.1
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit.