alertmanager-ntfy/flake.nix

{
  description = "Relay webhooks to ntfy.sh";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
    flake-utils.url = "git+https://code.252.no/tommy/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils, ... }:
    let
      # Define target systems for cross-compilation
      targetSystems = [ "x86_64-linux" "aarch64-darwin" ];

      name = "alertmanager-ntfy";
      registry = "code.252.no/tommy/alertmanager-ntfy";
      version = "1.1.0";

      # Map target systems to Docker architectures
      archMap = {
        "x86_64-linux" = "amd64";
        "aarch64-darwin" = "arm64";
      };
    in
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };

        # Generate cross-compiled packages for each target system
        crossPackages = builtins.listToAttrs (map (targetSystem:
          let
            crossPkgs = import nixpkgs {
              inherit system;
              crossSystem = targetSystem;
            };
            architecture = archMap.${targetSystem};

            # Build the Go application for the target system
            alertmanager-ntfy = crossPkgs.callPackage ./default.nix {};

            # Build the Docker image for the target system
            container = crossPkgs.dockerTools.buildImage {
              inherit name;
              tag = version;
              created = "now";

              # Set the architecture for the Docker image
              architecture = [ architecture ];

              copyToRoot = crossPkgs.buildEnv {
                name = "root-env";
                paths = [ alertmanager-ntfy crossPkgs.cacert ];
              };
              config.Cmd = [ "${alertmanager-ntfy}/bin/alertmanager-ntfy" ];
            };

            # Script to push the Docker image
            push-container = crossPkgs.writeShellScriptBin "push-container" ''
              #!/usr/bin/env bash
              set -e

              # Load the Docker image
              echo "Loading Docker image..."
              docker load < ${container}

              # Tag the image
              echo "Tagging Docker image..."
              docker tag ${name}:${version} ${registry}:${version}

              # Push the image to the Docker registry
              echo "Pushing Docker image to ${registry}:${version}..."
              docker push ${registry}:${version}
            '';
          in {
            name = targetSystem;
            value = {
              alertmanager-ntfy = alertmanager-ntfy;
              container = container;
              push-container = push-container;
            };
          }
        ) targetSystems);
      in
      {
        packages = crossPackages;
      }
    );
}