From ff807544492f1503ccac99ad6d472057f3d325a7 Mon Sep 17 00:00:00 2001
From: Paul Bonaud <paul.bonaud@fretlink.com>
Date: Mon, 29 Jun 2020 18:29:25 +0200
Subject: ci: trying to fix nix-channel by removing unstable channel

NIX_PATH used to be enough to select the channel to use, but as Travis
add the nixpkgs-unstable channel we can get unexpected results when
nix decides to push a new unstable version out there in the public.
---
 .travis.yml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 7ce4540..4a7aa46 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,12 @@ sudo: false
 language: nix
 nix: 2.3.4
 env:
-  - NIX_PATH=nixpkgs=channel:nixos-20.03
+  - CUSTOM_NIX_PATH=nixpkgs=channel:nixos-20.03
+
+# Travis nix integration will install nix AFTER the environment variables are set
+# and the nix installer will overide NIX_PATH variable thus we need to re-export it
+before_install:
+  - export NIX_PATH="$CUSTOM_NIX_PATH"
 
 install:
   - nix-env -i -f ./default.nix
-- 
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