install.sh

curl https://gist.githubusercontent.com/rkh/1ee2da1420fa28022fe5/raw/travis.sh -sSL > travis
chmod +x travis
./travis install

travis.sh

#!/usr/bin/env bash
export LC_CTYPE=en_US.UTF-8

case $(uname) in
  Darwin)
    export TRAVIS_OS_NAME="osx"
    export TRAVIS_OS_VERSION=$(sw_vers -productVersion);;
  Linux)
    export TRAVIS_OS_NAME=$(lsb_release -i -s | tr '[:upper:]' '[:lower:]')
    export TRAVIS_OS_VERSION=$(lsb_release -r -s);;
  *)
    echo "$(uname) is currently not supported"
    exit 1;;
esac

if [ -z "$TRAVIS_RUBY_VERSION" ]; then
  case $TRAVIS_OS_NAME in
    osx|ubuntu) export TRAVIS_RUBY_VERSION="2.1.2";;
    centos)     export TRAVIS_RUBY_VERSION="2.1.0";;
    *)          export TRAVIS_RUBY_VERSION="2.1.1";;
  esac
fi

[ -z "$TRAVIS_VERSION"          ] && export TRAVIS_VERSION="1.6.11"
[ -z "$TRAVIS_RUBY_LIB_VERSION" ] && export TRAVIS_RUBY_LIB_VERSION="2.1.0"
[ -z "$TRAVIS_CLI_SERVER"       ] && export TRAVIS_CLI_SERVER="https://cli.travis-ci.org"
[ -z "$TRAVIS_PATH"             ] && export TRAVIS_PATH="$HOME/.travis/$TRAVIS_VERSION"

[ $# = 0 ] || quoted_args="$(printf " %q" "$@")"
export GEM_HOME="$TRAVIS_PATH/vendor/ruby-$TRAVIS_RUBY_VERSION/lib/ruby/gems/$TRAVIS_RUBY_LIB_VERSION"
export GEM_PATH="$GEM_HOME"
unset RUBYLIB RUBYOPT

ruby="$TRAVIS_PATH/vendor/ruby-$TRAVIS_RUBY_VERSION/bin/ruby"
[ -z "$TRAVIS_COMMAND" ] && export TRAVIS_COMMAND=$(basename $0)

if [ "$TRAVIS_COMMAND" == "travis" ] && [ "$1" == "install" ]; then
  rm -rf "$TRAVIS_PATH/vendor"
  mkdir -p "$TRAVIS_PATH/vendor"
  curl $TRAVIS_CLI_SERVER/ruby\?os_name\=$TRAVIS_OS_NAME\&os_version\=$TRAVIS_OS_VERSION\&ruby_version\=$TRAVIS_RUBY_VERSION\&os_arch\=$(uname -m) -fL -o "$TRAVIS_PATH/vendor/ruby.tar.bz2"
  [ $? -eq 0 ] || exit $?
  cd "$TRAVIS_PATH/vendor"
  tar -jxPf ruby.tar.bz2
  cd -
  echo 'source "https://rubygems.org"; gem "travis"' > "$TRAVIS_PATH/dependencies.rb"
  retries=2
  while [ $retries -gt 0 ]; do
    [ $retries -lt 2 ] && echo -e "\n\n\033[31;1m!!! Pay no attention to that man behind the curtain !!!\033[0m\n\n"
    $ruby -S bundle install --gemfile="$TRAVIS_PATH/dependencies.rb" --standalone --path="$TRAVIS_PATH/vendor/bundle" --jobs=4 --retry=3 --no-cache --clean
    result=$?
    [ $result -eq 0 ] && break
    retries=$(($retries - 1))
  done
  rm -rf "$TRAVIS_PATH/dependencies.rb.lock" "$TRAVIS_PATH/.bundle" "$TRAVIS_PATH/vendor/ruby.tar.bz2" "$TRAVIS_PATH/dependencies.rb"
  exit $result
fi

if [ ! -d $GEM_HOME ] || [ ! -d "$TRAVIS_PATH/vendor/bundle" ]; then
  echo -e "\033[31mdependencies missing, please run \033[1mtravis install\033[0m"
  exit 1
fi

case $TRAVIS_COMMAND in
  travis)   exec "$ruby" --disable=gems -I "$TRAVIS_PATH/vendor/bundle" -r bundler/setup -r travis/cli -e 'Travis::CLI.run(ARGV)' -- $quoted_args;;
  ruby)     exec "$ruby" $quoted_args;;
  rake|gem) exec "$ruby" -S $TRAVIS_COMMAND $quoted_args;;
  *)
    echo "unknown command $TRAVIS_COMMAND" >&2
    exit 1;;
esac