replace language:nix

.travis.yml

@@ -1,5 +1,5 @@
-language: nix
-nix: 2.3.4
+version: ~> 1.0
+import: nix-community/nix-travis-ci:nix.yml@main
 
 sudo: false
 
@@ -23,20 +23,9 @@ env:
 
 matrix:
   include:
-    - env: NIX_CHANNEL=https://nixos.org/channels/nixpkgs-unstable
-    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-unstable
-    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-20.03
-
-install:
- - nix --version
- # for cachix we need travis to be a trusted nix user
- - echo "trusted-users = $USER" | sudo tee -a /etc/nix/nix.conf
- - sudo systemctl restart nix-daemon
- - if [ -n "${CACHIX_CACHE}" ]; then travis_retry nix-channel --update; fi
- - if [ -n "${CACHIX_CACHE}" ]; then nix-env -iA cachix -f https://cachix.org/api/v1/install; fi
- - if [ -n "${CACHIX_CACHE}" ]; then cachix use "${CACHIX_CACHE}"; fi
- - nix-channel --add "${NIX_CHANNEL}" nixpkgs
- - travis_retry nix-channel --update
+    - env: NIX_PATH: nixpkgs=channel:nixpkgs-unstable
+    - env: NIX_PATH: nixpkgs=channel:nixos-unstable
+    - env: NIX_PATH: nixpkgs=channel:nixos-20.03
 
 script:
  - nix-build ci.nix -A buildOutputs