f69820417f
By default, once you enter x86_64 Rosetta 2, macOS will try to run everything in x86_64. So an x86_64 Nix will still try to use x86_64 even when system = aarch64-darwin. To avoid this we can set kern.curproc_arch_affinity sysctl. With kern.curproc_arch_affinity=0, we ignore this preference. This is based on how https://opensource.apple.com/source/system_cmds/system_cmds-880.40.5/arch.tproj/arch.c.auto.html works. Completely undocumented, but seems to work! Note, you can verify this works with this impure Nix expression: ``` { a = derivation { name = "a"; system = "aarch64-darwin"; builder = "/bin/sh"; args = [ "-e" (builtins.toFile "builder" '' [ "$(/usr/bin/arch)" = arm64 ] [ "$(/usr/bin/arch -arch x86_64 /bin/sh -c /usr/bin/arch)" = i386 ] [ "$(/usr/bin/arch -arch arm64 /bin/sh -c /usr/bin/arch)" = arm64 ] /usr/bin/touch $out '') ]; }; b = derivation { name = "b"; system = "x86_64-darwin"; builder = "/bin/sh"; args = [ "-e" (builtins.toFile "builder" '' [ "$(/usr/bin/arch)" = i386 ] [ "$(/usr/bin/arch -arch x86_64 /bin/sh -c /usr/bin/arch)" = i386 ] [ "$(/usr/bin/arch -arch arm64 /bin/sh -c /usr/bin/arch)" = arm64 ] /usr/bin/touch $out '') ]; }; } ```
Nix
Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.
Installation
On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):
$ curl -L https://nixos.org/nix/install | sh
Information on additional installation methods is available on the Nix download page.
Building And Developing
See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.
Additional Resources
License
Nix is released under the LGPL v2.1.