ci: use latest version of Nix binaries and latest Ansible nix pkgs

diff --git a/.travis.yml b/.travis.yml
index 7bf8ed8ea8cfcec8fb2e3ef469765b234ce4a920..1deea24b5532eadc9bb4211b2fddbdb9ed7de596 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,24 @@
 ---
 language: nix
+nix: 2.3.1
+
 
 # Use the new container infrastructure
 sudo: false
 
 install:
+  # Update nix channels
+  - nix-channel --add https://nixos.org/channels/nixpkgs-19.09-darwin nixpkgs
+  - nix-channel --remove nixpkgs-unstable
+  - nix-channel --update
+
   # Install ansible
-  - nix-env -i python2.7-ansible python2.7-ansible-lint
+  - nix-env -i ansible ansible-lint
   - nix-env -if ./dhall-1.26.1.nix
 
   # Check ansible version
   - ansible --version
+  - ansible-lint --version
 
   # Create ansible.cfg with correct roles_path
   - printf '[defaults]\nroles_path=../' >ansible.cfg