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General Nix Setup

Using Nix is the easiest way to develop Alamgu ledger apps, and we recommend you use it.

Install Nix

Go to https://nixos.org/download.html and follow the instructions. The multi-user install is recommended.

Set up build caches (optional)

In addition to this app itself, the entire toolchain is packaged from source with Nix. That means that with using a pre-populated source of build artifacts, the first build will take a very long time as everything specific to Alamgu is built from source. (Other packages could also be built from source, but Nix by default ships configured to use the official cache.nixos.org build artifacts cache.)

If you are comfortable trusting Obsidian Systems's build farm, you can use our public open source cache for this purpose:

  • Store URL: s3://obsidian-open-source
  • Public key (for build artifact signatures): obsidian-open-source:KP1UbL7OIibSjFo9/2tiHCYLm/gJMfy8Tim7+7P4o0I=

To do this:

  1. First you want to include these two in your /etc/nix/nix.conf settings file. After doing so, it should have two lines like this:

    substituters = https://cache.nixos.org/ s3://obsidian-open-source
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= obsidian-open-source:KP1UbL7OIibSjFo9/2tiHCYLm/gJMfy8Tim7+7P4o0I=

    (The new values are each appended at the end of a space-separated list.)

  2. After updating that file, you probably need to restart your Nix daemon:

    • On macOS:
      • sudo launchctl stop org.nixos.nix-daemon
      • sudo launchctl start org.nixos.nix-daemon
    • On Linux:
      • sudo systemctl stop nix-daemon
      • sudo systemctl start nix-daemon

(On NixOS these tasks are done differently, consult the NixOS documentation for how to update your system configuration which includes these settings and will restart the daemon.)

Notice for caching with "Apple Silicon" Macs

We don't currently do builds for "Apple Silicon" (i.e. aarch64-darwin). To take advantage of our build caches then, you should pass --system x86_64-darwin to every nix invocation to instead use Intel mac builds instead.

That means when the instructions say something like:

nix foo bar baz...

instead do:

nix foo bar baz... --system x86_64-darwin