Installing Coco in Docker

In this chapter we give an example on how to run Coco, terminal only interaction, in Docker.

Prerequisites

1. A Linux machine, in this example Debian,
2. Docker (latest version, but any stable version should work fine).

Installation of Docker

Before installing Coco, we need Docker to be installed. To check if Docker is running on your machine, type:

$ docker --version

Skip the following step if Docker is already installed on your machine.

Installation from the Debian repository

A standard Debian distribution contains already a Docker package. It is usually called docker or docker.io. To install it, run:

$ sudo apt-get install docker.io

Installation from the Docker repository

If you need the newest version of Docker, you can use the Docker repository instead. The following procedure to install Docker is mostly the same for all Linux based machines. For more information, see the Docker documentation.

1. Update the apt package index:

   $ sudo apt-get update

2. Install packages to allow apt to use a repository over HTTPS:

   $ sudo apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common

3. Add Docker's official GPG key:

   $ sudo apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common

4. Use the following command to set up the stable repository:

   $ sudo add-apt-respostiory \
       "deb [arch=amd64] https://download.docker.com/linux/debian \
       $(lsb_release -cs) \
       stable"

5. Update the apt package index:

   $ sudo apt-get update

6. Install the latest version of Docker CE and containerd:

   $ sudo apt-get install docker-ce docker-ce-cli containerd.io

Verification of the installation

Now verify that your user account has the right to run Docker containers. On most UNIX^® systems, a user must be in the docker group. To verify this, use the id command, which prints the current groups a user is in. If you are not a member of docker, run:

$ sudo adduser <own account> docker

But afterwards it is usually necessary to log in again in order to make the group change visible.

To verify that Docker CE is installed correctly, run the hello-world image:

$ docker run hello-world

To remove the hello-world image, first run:

$ docker ps -a

The output should be a list of containers, with name, status, and more. It should contain one header line and one line for the hello-world image. In the first column, there is the container ID of the hello-world image. Run:

$ docker rm <container_id>

Installation of Coco in a Docker container

1. Create an empty directory. We will refer to it as work directory.
2. Download a Coco package to the work directory. It must be a file that ends in .run, like SquishCocoSetup_5.0.0_Linux_x86_64.run.
3. In the work directory, create a file named Dockerfile, with the following content:

   # Select base image
   FROM debian
   
   # Install packages for your project
   RUN apt-get update && apt-get upgrade -y && apt-get install -y libgtk2.0-dev locate
   
   # Set "secret" as root password
   RUN echo "root:secret" | chpasswd
   
   # Define a user
   RUN useradd -ms /bin/bash myapp
   USER myapp
   WORKDIR /home/myapp
   
   # Copy the Coco installer to the work directory
   COPY SquishCocoSetup*.run .

   For an actual project, the content of the file must be adapted. In this example, it does the following:

   1. Loads an image from the Docker Hub website. In this case it is the most recent Debian image, but any Linux image should work.
   2. Installs some packages. In a real use case, these would be the prerequisites of the software project for which code coverage should be measured. (The locate package is here included because with it, the Coco installer will work better.)

      The installation commands that are given here obviously only work on a Debian or Debian-like system, like Ubuntu.

   3. Sets a root password that is later needed by the Coco installer, which runs from a user account.
   4. Creates a user account.
   5. Copies the Coco installer into the container. It will be located in the home directory of the user myapp.

      The wildcard pattern SquishCocoSetup*.run matches the name of any Coco installer package, independent of the version number.

4. In the work directory, run the command:

   $ docker build -t squishcoco .

   Docker will then create an image with the name squishcoco.

5. To run the image, execute the command:

   $ docker run -it --name runner squishcoco

   Then a container named runner will be created and started.

6. You will now see the command prompt of the container, no longer that of your operating system. You are now in the home directory of the user myapp.

   This directory also contains a copy of the Coco installer package. You can run it with a command like:

   myapp@a6e8af:~$ bash SquishCocoSetup_5.0.0_Linux_x86_64.run

   The installer will ask you to accept the license and then let you choose between different installation modes. Choose the first, "Installation on the local machine". The installer will then ask for the root password, which is of course secret.

7. The next step is the setup of the Coco license. You can follow the instructions in "Using the bundled License Service".
8. Now Coco is installed in Docker. You can exit the container with the exit command.
9. To enter the container again, run:

   $ docker start -ai runner