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Setting Up the Binary Cache

Building Spectrum from source can take a very long time. To avoid having to wait when building the system to try it out or test patches, an x86_64 binary cache service is available. If configured to do so, Nix will download build outputs from the cache, instead of building them locally.

Builds are run on the latest NixOS unstable on Vultr, and are signed to ensure authenticity. The build infrastructure and signing key are accessible by Alyssa Ross and Puck Meerburg. Storage is provided by Daniel Kuehn. Please get in touch if you encounter any trouble with it.

The binary cache is currently not able to provide logs, due to a Nix bug.

On NixOS

The following configuration adds the Spectrum binary cache as a substituter, and tells Nix to trust builds signed with its public key.

{ ... }:

  nix.settings.substituters = [ "" ];
  nix.settings.trusted-public-keys = [

On Non-NixOS systems

Add the following configuration to /etc/nix/nix.conf:

substituters =
trusted-public-keys =

If you have other binary caches configured besides, make sure to add the Spectrum cache URL and public key to the existing configuration lines in your nix.conf file.