diff --git a/LICENSE b/LICENSE
index d645695..e8d43bf 100644
--- a/LICENSE
+++ b/LICENSE
@@ -187,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright [yyyy] [name of copyright owner]
+   Copyright 2019 Hercules Labs OÜ
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/README.asciidoc b/README.asciidoc
index 725f3c3..459b0b8 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -51,7 +51,7 @@ Add this module to your NixOS configuration:
 
 ```nix
 { ... }: {
-  environment.systemPackages = [ (import (builtins.fetchTarball https://github.com/hercules-ci/arion/tarball/master) {}) ];
+  environment.systemPackages = [ (import (builtins.fetchTarball https://github.com/hercules-ci/arion/tarball/master) {}).arion ];
   virtualisation.docker.enable = true;
   users.extraUsers.myuser.extraGroups = ["docker"];
 }
diff --git a/bors.toml b/bors.toml
new file mode 100644
index 0000000..8d42320
--- /dev/null
+++ b/bors.toml
@@ -0,0 +1,5 @@
+status = [
+  "ci/hercules/derivations",
+  "ci/hercules/evaluation",
+]
+delete_merged_branches = true
diff --git a/src/nix/modules/composition/docker-compose.nix b/src/nix/modules/composition/docker-compose.nix
index 6734041..c223f68 100644
--- a/src/nix/modules/composition/docker-compose.nix
+++ b/src/nix/modules/composition/docker-compose.nix
@@ -22,7 +22,7 @@ in
       readOnly = true;
     };
     build.dockerComposeYamlText = lib.mkOption {
-      type = lib.types.string;
+      type = lib.types.str;
       description = "The text of build.dockerComposeYaml.";
       readOnly = true;
     };
diff --git a/src/nix/modules/composition/host-environment.nix b/src/nix/modules/composition/host-environment.nix
index 3e36531..5989695 100644
--- a/src/nix/modules/composition/host-environment.nix
+++ b/src/nix/modules/composition/host-environment.nix
@@ -15,7 +15,7 @@
     };
 
     host.nixStorePrefix = lib.mkOption {
-      type = lib.types.string;
+      type = lib.types.str;
       default = "";
       example = "/mnt/foo";
       description = ''
diff --git a/src/nix/modules/service/docker-compose-service.nix b/src/nix/modules/service/docker-compose-service.nix
index 54dae9f..80a795d 100644
--- a/src/nix/modules/service/docker-compose-service.nix
+++ b/src/nix/modules/service/docker-compose-service.nix
@@ -90,6 +90,11 @@ in
       default = null;
       description = dockerComposeRef "command";
     };
+    service.container_name = mkOption {
+      type = nullOr types.str;
+      default = null;
+      description = dockerComposeRef "container_name";
+    };
     service.depends_on = mkOption {
       type = listOf str;
       default = [];
@@ -169,6 +174,11 @@ in
       default = null;
       description = dockerComposeRef "network_mode";
     };
+    service.networks = mkOption {
+      type = nullOr (listOf types.str);
+      default = null;
+      description = dockerComposeRef "networks";
+    };
     service.stop_signal = mkOption {
       type = nullOr str;
       default = null;
@@ -214,6 +224,8 @@ in
     inherit cap_drop;
   } // lib.optionalAttrs (config.service.command != null) {
     inherit (config.service) command;
+  } // lib.optionalAttrs (config.service.container_name != null) {
+    inherit (config.service) container_name;
   } // lib.optionalAttrs (config.service.depends_on != []) {
     inherit (config.service) depends_on;
   } // lib.optionalAttrs (config.service.devices != []) {
@@ -238,6 +250,8 @@ in
     inherit (config.service) privileged;
   } // lib.optionalAttrs (config.service.network_mode != null) {
     inherit (config.service) network_mode;
+  } // lib.optionalAttrs (config.service.networks != null) {
+    inherit (config.service) networks;
   } // lib.optionalAttrs (config.service.restart != null) {
     inherit (config.service) restart;
   } // lib.optionalAttrs (config.service.stop_signal != null) {
diff --git a/src/nix/modules/service/host-store.nix b/src/nix/modules/service/host-store.nix
index 9ec06fc..63a77c1 100644
--- a/src/nix/modules/service/host-store.nix
+++ b/src/nix/modules/service/host-store.nix
@@ -17,6 +17,11 @@ in
       default = false;
       description = "Bind mounts the host store if enabled, avoiding copying.";
     };
+    service.hostStoreAsReadOnly = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Adds a ':ro' (read-only) access mode to the host nix store bind mount.";
+    };
     service.useHostNixDaemon = mkOption {
       type = types.bool;
       default = false;
@@ -29,8 +34,8 @@ in
     service.build.context = "${../../../arion-image}";
     service.environment.NIX_REMOTE = lib.optionalString config.service.useHostNixDaemon "daemon";
     service.volumes = [
-      "${config.host.nixStorePrefix}/nix/store:/nix/store"
-      "${config.host.nixStorePrefix}${pkgs.buildEnv { name = "container-system-env"; paths = [ pkgs.bashInteractive pkgs.coreutils ]; }}:/run/system"
+      "${config.host.nixStorePrefix}/nix/store:/nix/store${lib.optionalString config.service.hostStoreAsReadOnly ":ro"}"
+      "${config.host.nixStorePrefix}${pkgs.buildEnv { name = "container-system-env"; paths = [ pkgs.bashInteractive pkgs.coreutils ]; }}:/run/system${lib.optionalString config.service.hostStoreAsReadOnly ":ro"}"
       ] ++ lib.optional config.service.useHostNixDaemon "/nix/var/nix/daemon-socket:/nix/var/nix/daemon-socket";
     service.command = lib.mkDefault (map escape (config.image.rawConfig.Cmd or []));
   };
diff --git a/src/nix/modules/service/nixos-init.nix b/src/nix/modules/service/nixos-init.nix
index 7521a09..5e97451 100644
--- a/src/nix/modules/service/nixos-init.nix
+++ b/src/nix/modules/service/nixos-init.nix
@@ -26,6 +26,7 @@ in
     ];
     image.command = [ "${config.nixos.build.toplevel}/init" ];
     service.environment.container = "docker";
+    service.environment.PATH = "/usr/bin:/run/current-system/sw/bin/";
     service.volumes = [
       "/sys/fs/cgroup:/sys/fs/cgroup:ro"
     ];