Rewrite Travis CI now that Indigo is EOL (#545)

* Remove Indigo from Travis CI, tweak some other settings

.travis.yml

@@ -1,35 +1,45 @@
 sudo: required
-dist: trusty
-language: generic
+dist: xenial
+language: cpp
+compiler:
+  - gcc
 
 notifications:
   email:
     on_success: always
     on_failure: always
 
-install: git clone https://github.com/ros-industrial/industrial_ci.git .ci_config
-script: source .ci_config/travis.sh
+cache:
+  directories:
+    - $HOME/.ccache
+
+env:
+  global:
+    - ROS_REPO=ros
+    - CCACHE_DIR=$HOME/.ccache
+  matrix:
+    - ROS_DISTRO="kinetic" ROS_REPO="ros-shadow-fixed"
+    - ROS_DISTRO="kinetic"
+    - ROS_DISTRO="lunar" ROS_REPO="ros-shadow-fixed"
+    - ROS_DISTRO="lunar"
+    - ROS_DISTRO="melodic" ROS_REPO="ros-shadow-fixed"
+    - ROS_DISTRO="melodic"
 
-jobs:
+matrix:
   include:
-    - stage: build-shadow-fixed
-      env: ROS_DISTRO="indigo" ROS_REPOSITORY_PATH=http://packages.ros.org/ros-shadow-fixed/ubuntu
-    - env: ROS_DISTRO="kinetic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros-shadow-fixed/ubuntu
-    - env: ROS_DISTRO="lunar" ROS_REPOSITORY_PATH=http://packages.ros.org/ros-shadow-fixed/ubuntu
-    - env: ROS_DISTRO="melodic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros-shadow-fixed/ubuntu
-    - stage: build-released
-      env: ROS_DISTRO="indigo" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="kinetic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="lunar" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="melodic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - stage: lint
-      sudo: false
-      install: pip install --user -q catkin-lint
+    - language: python
+      python: 3.7
+      install:
+      - pip install -q catkin-lint rosdep
+      - sudo $(which rosdep) init
+      - rosdep update
       script: catkin_lint -W2 --explain .
-      env: JOB="catkin_lint"
+      env: JOB="catkin_lint" ROS_DISTRO="kinetic"
   allow_failures:
-    - env: ROS_DISTRO="indigo" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="kinetic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="lunar" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: ROS_DISTRO="melodic" ROS_REPOSITORY_PATH=http://packages.ros.org/ros/ubuntu
-    - env: JOB="catkin_lint"
+    - env: ROS_DISTRO="kinetic"
+    - env: ROS_DISTRO="lunar"
+    - env: ROS_DISTRO="melodic"
+    - env: JOB="catkin_lint" ROS_DISTRO="kinetic"
+
+install: git clone https://github.com/ros-industrial/industrial_ci.git .ci_config
+script: source .ci_config/travis.sh