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language: nix
nix: 2.3.4

sudo: false

env:
  global:
    # Set this to cache your build results in cachix for faster builds
    # in travis and for everyone who uses your cache.
    #
    # Format: Your cachix cache host name without the ".cachix.org" suffix.
    # Example: mycache (for mycache.cachix.org)
    #
    # For this to work, you also need to set the  CACHIX_SIGNING_KEY
    # in your repository settings in Travis.
    - CACHIX_CACHE=
    # Set this to notify the global nur package registry that changes are
    # available.
    #
    # The repo name as used in
    # https://github.com/nix-community/NUR/blob/master/repos.json
    - NUR_REPO=<YOUR_NUR_REPO_NAME_HERE>

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

script:
 - nix-build ci.nix -A buildOutputs
 - nix eval -f default.nix 'lib'
 - nix eval -f default.nix 'modules'
 - nix eval -f default.nix 'overlays'

after_success:
  - if [ -n "${CACHIX_CACHE}" ]; then nix-build ci.nix -A cacheOutputs | cachix push "${CACHIX_CACHE}"; fi
  - if [ "cron" != "${TRAVIS_EVENT_TYPE}" -a "false" = "${TRAVIS_PULL_REQUEST}" -a "master" = "${TRAVIS_BRANCH}" ]; then
      curl -XPOST "https://nur-update.herokuapp.com/update?repo=${NUR_REPO}"; fi