Problem: Travis tests only in containers

Solution: Add build on bare machine

.travis.yml

 language: minimal
-env:
-    - PYTHON_VER=2.7 BUILD_TYPE=centos_containers
-    - PYTHON_VER=3.5 BUILD_TYPE=centos_containers
-    - PYTHON_VER=3.6 BUILD_TYPE=centos_containers
-    - PYTHON_VER=3.7 BUILD_TYPE=centos_containers
-    - PYTHON_VER=3.8 BUILD_TYPE=centos_containers
-    - PYTHON_VER=3.9 BUILD_TYPE=centos_containers
-    - PYTHON_VER=2.7 BUILD_TYPE=debian_containers
-    - PYTHON_VER=3.5 BUILD_TYPE=debian_containers
-    - PYTHON_VER=3.6 BUILD_TYPE=debian_containers
-    - PYTHON_VER=3.7 BUILD_TYPE=debian_containers
-    - PYTHON_VER=3.8 BUILD_TYPE=debian_containers
-    - PYTHON_VER=3.9 BUILD_TYPE=debian_containers
 
 jobs:
+  include:
+    - language: python
+      python: 2.7
+      env: BUILD_TYPE=bare_machines
+    - language: python
+      python: 3.5
+      env: BUILD_TYPE=bare_machines
+    - language: python
+      python: 3.6
+      env: BUILD_TYPE=bare_machines
+    - language: python
+      python: 3.7
+      env: BUILD_TYPE=bare_machines
+    - language: python
+      python: 3.8
+      env: BUILD_TYPE=bare_machines
+    - language: minimal
+      env: PYTHON_VER=2.7 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.5 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.6 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.7 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.8 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.9 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=2.7 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.5 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.6 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.7 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.8 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.9 BUILD_TYPE=debian_containers
   allow_failures:
-  - env: PYTHON_VER=3.9 BUILD_TYPE=centos_containers
-  - env: PYTHON_VER=3.9 BUILD_TYPE=debian_containers
+    - language: minimal
+      env: PYTHON_VER=3.9 BUILD_TYPE=centos_containers
+    - language: minimal
+      env: PYTHON_VER=3.9 BUILD_TYPE=debian_containers
 
 services:
     - docker

builds/bare_machines/ci_build.sh

+#!/bin/bash
+
+set -x
+set -e
+
+cd ../..
+
+# Travis Python comes with preinstalled six
+# which breaks test suite
+pip uninstall -y six || true
+python dev.py
+bin/test -c -vvv