dev-templates/podman/flake.nix

{
  description = "Rootless Podman";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs/release-22.11";
  };

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages.${system};
    in {
      # echo "username:100000:65536">>/etc/subuid
      # echo "username:100000:65536">>/etc/subgid

      devShells.default = pkgs.mkShell {
        buildInputs = [
          pkgs.podman # CLI
          pkgs.runc # Container runtime
          pkgs.conmon # Container runtime monitor
          pkgs.skopeo # Interact with container registry
          pkgs.slirp4netns # User-mode networking
        ];
        shellHook = let
          podmanSetupScript = let
            policyConf = pkgs.writeText "policy.conf" ''
              {"default":[{"type":"insecureAcceptAnything"}],"transports":{"docker-daemon":{"":[{"type":"insecureAcceptAnything"}]}}}
            '';
            registriesConf = pkgs.writeText "registries.conf" ''
              [registries]
              [registries.block]
              registries = []
              [registries.insecure]
              registries = []
              [registries.search]
              registries = ["docker.io", "quay.io"]
            '';
          in
            pkgs.writeScript "podman-setup" ''
              #!${pkgs.runtimeShell}
              if ! test -f ~/.config/containers/policy.json; then
                install -Dm555 ${policyConf} ~/.config/containers/policy.json
              fi
              if ! test -f ~/.config/containers/registries.conf; then
                install -Dm555 ${registriesConf} ~/.config/containers/registries.conf
              fi
            '';
        in ''
          ${podmanSetupScript}
        '';
      };
    });
}