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All packages in this repository are automatically built and cached on each update. Configure your system to pull from the cache instead of building packages locally.
The cache is hosted at https://nix.trev.zip and requires the trusted public key for verification.

​
Single Flake Configuration

Add cache configuration to your flake.nix using nixConfig:
flake.nix
{
  nixConfig = {
    extra-substituters = [
      "https://nix.trev.zip"
    ];
    extra-trusted-public-keys = [
      "trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU="
    ];
  };

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    trev = {
      url = "github:spotdemo4/nur";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { nixpkgs, trev, ... }: {
    # Your configuration here
  };
}
The nixConfig attribute in your flake is applied when you run commands like nix build, nix develop, or nix run. This configuration only affects commands run from this specific flake.Users of your flake will also benefit from this cache configuration automatically.

​
System-Wide Configuration

Configure the cache for all Nix operations on your NixOS system:
1

Add to NixOS configuration

Add the cache to your NixOS configuration module:
configuration.nix
{
  nix.settings = {
    trusted-substituters = [
      "https://nix.trev.zip"
    ];
    trusted-public-keys = [
      "trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU="
    ];
  };
}
Use trusted-substituters and trusted-public-keys (not extra-substituters) for system-wide configuration to ensure unprivileged users can access the cache.
2

Rebuild your system

Apply the configuration:
sudo nixos-rebuild switch
3

Verify cache access

Check that the cache is accessible:
nix store ping --store https://nix.trev.zip
You should see output indicating the store is reachable.

​
Home Manager Configuration

For home-manager users, add the cache configuration:
home.nix
{
  home.sessionVariables = {
    NIX_CONFIG = ''
      extra-substituters = https://nix.trev.zip
      extra-trusted-public-keys = trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU=
    '';
  };
}

​
Multi-User Installation

On multi-user Nix installations (including NixOS), configure /etc/nix/nix.conf:
/etc/nix/nix.conf
trusted-substituters = https://cache.nixos.org https://nix.trev.zip
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU=
Then restart the Nix daemon: 
sudo systemctl restart nix-daemon

​
Verification

Verify that packages are being pulled from the cache:
1

Clear local cache

Run a build with verbose output to see which substituters are used:
nix build github:spotdemo4/nur#bobgen --print-build-logs
2

Check for cache hits

Look for lines indicating downloads from the cache:
copying path '/nix/store/...-bobgen-...' from 'https://nix.trev.zip'...
If you see compilation output instead, the cache isn’t configured correctly.

​
Cache Information

Cache URL

https://nix.trev.zip

Public Key

trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU=

Update Frequency

Automatic on every repository update

Retention

All built packages are cached

​
Troubleshooting

  1. Verify the cache URL is correct in your configuration
  2. Check that the public key matches exactly
  3. Ensure you’ve restarted the Nix daemon or rebuilt your system
  4. Run nix store ping --store https://nix.trev.zip to test connectivity
Use trusted-substituters instead of extra-substituters in your system configuration. The trusted- prefix allows unprivileged users to use the cache.
The cache server may be experiencing high load. You can temporarily disable it by removing it from your substituters list, though this will require building packages from source.

​
Alternative: Per-Command Cache

Use the cache for a single command without configuring it system-wide: 
nix build github:spotdemo4/nur#bobgen \
  --substituters "https://cache.nixos.org https://nix.trev.zip" \
  --trusted-public-keys "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= trev:I39N/EsnHkvfmsbx8RUW+ia5dOzojTQNCTzKYij1chU="
This approach requires typing the full command each time. For regular use, configure the cache in your flake or system configuration instead.

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