installer: add post check

.travis.yml

@@ -7,13 +7,6 @@ matrix:
       - nix-build ./release.nix -I darwin=. -A tests
       - nix-build ./release.nix -I darwin=. -A examples.simple
       - yes | nix-shell -A installer
-      - /run/current-system/sw/bin/darwin-rebuild switch -I darwin=$HOME/.nix-defexpr/channels/darwin -I darwin-config=$HOME/.nixpkgs/darwin-configuration.nix
-      - yes | nix-shell -A uninstaller
-    - os: osx
-      osx_image: xcode7.3  # 10.11
-      script:
-      - nix-build ./release.nix -I darwin=. -A tests
-      - nix-build ./release.nix -I darwin=. -A examples.simple
-      - yes | nix-shell -A installer
+      - nix-shell -A installer.check
       - /run/current-system/sw/bin/darwin-rebuild switch -I darwin=$HOME/.nix-defexpr/channels/darwin -I darwin-config=$HOME/.nixpkgs/darwin-configuration.nix
       - yes | nix-shell -A uninstaller

pkgs/darwin-installer/configuration.nix

@@ -5,7 +5,7 @@ with lib;
 {
   imports = [ <user-darwin-config> ];
 
-  # NOTE: don't set this outside of the instaler.
+  # NOTE: don't set this outside of the installer.
   users.nix.configureBuildUsers = true;
   users.knownGroups = [ "nixbld" ];
   users.knownUsers = [ "nixbld1" "nixbld2" "nixbld3" "nixbld4" "nixbld5" "nixbld6" "nixbld7" "nixbld8" "nixbld9" "nixbld10" ];

pkgs/darwin-installer/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, nix, pkgs }:
+{ stdenv, writeScript, nix, pkgs }:
 
 let
   nixPath = stdenv.lib.concatStringsSep ":" [
@@ -21,7 +21,6 @@ stdenv.mkDerivation {
   '';
 
   shellHook = ''
-    #!/usr/bin/env bash
     set -e
 
     action=switch
@@ -76,4 +75,35 @@ stdenv.mkDerivation {
     echo >&2
     exit
   '';
+
+  passthru.check = stdenv.mkDerivation {
+     name = "run-darwin-test";
+     shellHook = ''
+        set -e
+        echo >&2 "running installer tests..."
+        echo >&2
+
+        echo >&2 "checking configuration.nix"
+        test -f ~/.nixpkgs/darwin-configuration.nix
+        test -w ~/.nixpkgs/darwin-configuration.nix
+        echo >&2 "checking darwin channel"
+        readlink ~/.nix-defexpr/channels/darwin
+        test -e ~/.nix-defexpr/channels/darwin
+        echo >&2 "checking /etc"
+        readlink /etc/static
+        test -e /etc/static
+        grep /etc/static/bashrc /etc/bashrc
+        grep -v nix-daemon.sh /etc/profile
+        echo >&2 "checking /run/current-system"
+        readlink /run
+        test -e /run
+        readlink /run/current-system
+        test -e /run/current-system
+        echo >&2 "checking profile"
+        readlink /nix/var/nix/profiles/system
+        test -e /nix/var/nix/profiles/system
+        echo >&2 ok
+        exit
+    '';
+  };
 }