.travis.yml

sudo: required

services:
  - docker

# show correct language tag in Travis CI build
language: cpp

env:
  matrix:
    - INSTALL_ROS: false    ## use ubuntu docker image from docker hub


before_install:
  - pwd
  - ./scripts/docker_build_image.sh
  - ./scripts/docker_run.sh

## -e set the environment variable for the bash shell of the container, then we don't need pass in
## the ENV variable with docker exec every time.
## The default value of $HOME in container is /root. But the $HOME is /home/travis in travis. We have to match them
## by setting a $HOME variable for a container.
## http://romanvm.pythonanywhere.com/post/using-docker-travis-continuous-integration-25/
## docker run:  pulls the necessary image (latest Ubuntu LTS in this case) from Docker repository
## -d option tells that our image will run in detached or background mode.
## --name option sets the name of our container ("ubuntu-test")  so we can address it later.
## -v option maps the current working directory ($(pwd)) into our Docker container under /travis directory
## /home/travis  also maps to $HOME variable
## so we can access our build files from within the container.
## ubuntu:latest is the name of our Docker image that our build container is based on.
## The problem with docker run command is that our container immediately stops if we do not provide it
## with any commands, so we need to keep it running somehow. And this is what the command tail -f /dev/null
## used for — it blocks the shell inside the container and prevents it from stopping, so we can send our commands to it.

## docker ps command prints the list of running containers.
## It is optional and used only for diagnostic purposes.

install:
  - ./scripts/docker_install_dependencies.sh

## docker exec command allows to execute a command or a series of Linux shell commands inside our container.
## -t options allocates a pseudo-TTY for this command(-s) so you can view output or error messages, if any, in Travis CI build log.
## xenial is the name of a container we send commands to.
## bash -c means that we will execute the following string in bash shell.
## YAML allows to span strings enclosed in quotes (") into several lines and I recommend to put each command on a separate line for
## better readability. Bash commands are separated with a semicolon (;).

script:
  - ./scripts/docker_compile_pkgs.sh



notifications:
    email: false