Use Travis CLI everywhere by running docker

travis.sh

#!/bin/sh

set -e

OPWD=$(pwd)
TRAVIS_DIR="$HOME/.travis-cli"
TRAVIS_RCFILE="$HOME/.travis"
TRAVIS_IMAGETAG="travis:local"

# Check that all we need exists
command_exists() { command -v "$1" >/dev/null 2>&1 || { echo >&2 "I require $1 but it's not installed.  Aborting."; exit 1; }; }
docker_installed() { command -v docker >/dev/null 2>&1 || { wget -O- http://get.docker.com | sh - ; }; command -v docker >/dev/null 2>&1 || { echo >&2 "I require docker but it's not installed and I can't install it myself.  Aborting."; exit 1; }; } 

docker_installed


# Simple create the tivial Travis CLI Dockerfile
if [ ! -e "$TRAVIS_DIR" ]; then
    mkdir "$TRAVIS_DIR"
    cat >"$TRAVIS_DIR/Dockerfile" <<EOF
FROM ruby:2.3

RUN gem install travis \
    && mkdir /app

WORKDIR /app

ENTRYPOINT ["travis"]
EOF

fi

# Use sudo if docker socket is not writeable
[ -w /var/run/docker.sock ] || SUDO=sudo
[ -e /etc/fedora-release ] && MOUNTOPTIONS=:z



cd "$TRAVIS_DIR"

# Check that there is a image. If not build a new one
if [ "$($SUDO docker images --format "{{.Repository}}:{{.Tag}}" | grep -c "$TRAVIS_IMAGETAG")" -eq 0 ]; then
    $SUDO docker build -t "$TRAVIS_IMAGETAG" .
fi

# Switch back to original directory
cd "$OPWD"

# Run t in container
exec $SUDO docker run --rm -it -u "$(id -u)" -v "$(pwd):/app$MOUNTOPTIONS" -v "$TRAVIS_RCFILE:/.travis$MOUNTOPTIONS" --read-only $TRAVIS_IMAGETAG "$@"