diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d5d2ec066..4415ba4e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -98,6 +98,21 @@ jobs:
         run: './ci/check-tests.sh'
         env:
           NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz"
+  coverage-darwin:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Nix
+        uses: cachix/install-nix-action@v12
+      - name: Prefetch shell.nix
+        run: "nix-shell --run true"
+      - name: Coverage
+        run: "./ci/check-tests.sh"
+        env:
+          NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz"
   docs:
     runs-on: ubuntu-latest
     steps:
diff --git a/nix/eval-machine-info.nix b/nix/eval-machine-info.nix
index aa4103395..98c281a3f 100644
--- a/nix/eval-machine-info.nix
+++ b/nix/eval-machine-info.nix
@@ -44,11 +44,12 @@ let
     else import (pkgs.path + "/nixos/lib/eval-config.nix");
 
   pkgs = if flakeUri != null
-    then
-      if network ? nixpkgs
-      then (builtins.head network.nixpkgs).legacyPackages.${system}
-      else throw "NixOps network must have a 'nixpkgs' attribute"
-    else (builtins.head (network.network)).nixpkgs or (import <nixpkgs> { inherit system; });
+         then
+           if network ? nixpkgs
+           then (builtins.head network.nixpkgs).legacyPackages.${system}
+           else throw "NixOps network must have a 'nixpkgs' attribute"
+         else if network ? nixpkgs then (builtins.head (network.nixpkgs))
+         else (import <nixpkgs> { inherit system; });
 
   inherit (pkgs) lib;
 
diff --git a/nixops/backends/__init__.py b/nixops/backends/__init__.py
index c716cded2..ac4a9c86f 100644
--- a/nixops/backends/__init__.py
+++ b/nixops/backends/__init__.py
@@ -592,7 +592,7 @@ def download_file(self, source: str, target: str, recursive: bool = False):
         )
         return self._logged_exec(cmdline)
 
-    def get_console_output(self):
+    def get_console_output(self) -> str:
         return "(not available for this machine type)\n"