{
  description = "Development environment for nix'ing with triton";

  inputs.devshell.url = "github:numtide/devshell";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:nixos/nixpkgs/release-21.11";
  inputs.nixpkgsFork.url = "github:teutat3s/nixpkgs/feature/triton-completion";
  inputs.nixpkgs20-09.url = "github:nixos/nixpkgs/release-20.09";

  outputs = { self, flake-utils, devshell, nixpkgs, nixpkgsFork, nixpkgs20-09 }:
    flake-utils.lib.eachDefaultSystem (system: {
      packages.triton-utils =
        let
          pkgs = import nixpkgs {
            inherit system;
          };
        in
        pkgs.stdenv.mkDerivation {
          pname = "triton-utils";
          version = "0.0.1";
          src = pkgs.lib.cleanSource ./.;

          installPhase = ''
              mkdir -p $out/bin $out/share/certs
              cd ./utils
              cp ./cacert-2021-10-26.pem $out/share/certs
              cp ./triton-docker.env.sh $out/bin
              cp ./ttp.sh $out/bin
              cp ./unset-env.sh $out/bin
          '';
        };
      devShell =
        let
          pkgs = import nixpkgs {
            inherit system;

            overlays = [ devshell.overlay ];
          };
          pkgsFork = import nixpkgsFork {
            inherit system;

            overlays = [ devshell.overlay ];
          };
          pkgs20-09 = import nixpkgs20-09 {
            inherit system;

            overlays = [ devshell.overlay ];
          };
        in
        pkgs.devshell.mkShell {
          name = "tritonshell";

          devshell.interactive = {
            PS1_util = pkgs.lib.noDepEntry ''
              if [[ -n "''${PRJ_ROOT:-}" ]]; then
                # Print the path relative to $PRJ_ROOT
                rel_root() {
                  local path
                  path=$(${pkgs.coreutils}/bin/realpath --relative-to "$PRJ_ROOT" "$PWD")
                  if [[ $path != . ]]; then
                    echo " $path "
                  fi
                }
              else
                # If PRJ_ROOT is unset, print only the current directory name
                rel_root() {
                  echo " \W "
                }
              fi
            '';
            PS1.text = ''
              PS1='\[\033[38;5;202m\][$TRITON_PROFILE@tritonshell]$(rel_root)\$ \[\033[0m\]'
            '';
          };

          commands = [
            {
              package = pkgs.devshell.cli;
              help = "Per project developer environments";
            }
            {
              package = pkgsFork.nodePackages.triton;
              category = "triton & manta tools";
              name = "triton";
              help = "Triton DC CLI (https://docs.joyent.com/public-cloud/api/triton-cli)";
            }
            {
              package = pkgsFork.nodePackages.manta;
              category = "triton & manta tools";
              name = "manta";
              help = "Manta CLI (https://apidocs.joyent.com/manta/index.html#cli)";
            }
          ];

          devshell.packages = [
            pkgs.bash-completion
            # use docker-compose version 1.26.2 for best triton API compatibility
            pkgs20-09.docker-compose
            # used in ./utils/triton-docker.env.sh
            pkgs.nodePackages.json
            self.packages.${system}.triton-utils
          ];

          env = [
            # workaround for TLS certs bug in docker-compose, CERTIFICATE_VERIFY_FAILED
            # see: https://github.com/joyent/triton-docker-cli/issues/17
            {
              name = "CURL_CA_BUNDLE";
              value = "${self.packages.${system}.triton-utils}/share/certs/cacert-2021-10-26.pem";
            }
            {
              name = "NOMAD_ADDR";
              value = "https://nomad.service.consul:4646";
            }
            {
              name = "VAULT_ADDR";
              value = "https://nomad.service.consul:8200";
            }
          ];

          bash = {
            extra = ''
              source ${self.packages.${system}.triton-utils}/bin/triton-docker.env.sh
              source ${self.packages.${system}.triton-utils}/bin/ttp.sh
              if [ "$(uname)" == "Darwin" ]; then
                source $DEVSHELL_DIR/share/bash-completion/bash_completion
              fi
            '';
          };
        };
    });
}