Add end-to-end tests for Ubuntu 12.04, 14.04 and 16.04 using Docker (yarnpkg#1391)

Author: Daniel15

end_to_end_tests/README.md

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+This directory contains end-to-end tests for Yarn. The tests perform the following steps:
+
+1. Spin up a fresh Docker container
+2. Install Yarn through the package repository
+3. Run `yarn add react` in a test directory

end_to_end_tests/data/run-ubuntu.sh

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+#!/bin/bash
+# Executed within a fresh Docker container to test installation and execution of Yarn.
+set -ex
+
+. /etc/lsb-release
+
+# Set proxy if one was passed in (eg. if caching on the host machine using apt-cacher-ng)
+if [ -n "$APT_PROXY" ]; then
+    echo 'Acquire::http::proxy "http://'$APT_PROXY'";' > /etc/apt/apt.conf.d/02proxy
+fi;
+
+# Add Yarn repo
+apt-key adv --keyserver pgp.mit.edu --recv D101F7899D41F3C3
+# TODO: Use nightly repo once it's configured
+echo "deb http://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
+apt-get update -y
+
+if [ "$DISTRIB_RELEASE" == '12.04' -o "$DISTRIB_RELEASE" == '14.04' ]; then
+  # This is an old Ubuntu version; we need to add the NodeSource repo too
+  apt-get install curl -y
+  curl -sL https://deb.nodesource.com/setup_6.x | bash -
+fi;
+
+# TODO: Remove ca-certificates from this list once https://github.com/yarnpkg/yarn/issues/1390 is fixed
+apt-get install yarn ca-certificates -y
+
+./run-yarn-test.sh

end_to_end_tests/data/run-yarn-test.sh

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+#!/bin/bash
+# Executed within a fresh Docker container to test execution of Yarn.
+# Should be executed after Yarn has been installed.
+set -ex
+
+fail_with_log() {
+  # Include the yarn-error.log file in the output, if available
+  exitcode=$?
+  if [ -s yarn-error.log ]; then
+    cat yarn-error.log
+  fi;
+  exit $exitcode
+}
+
+cd /tmp
+mkdir yarntest
+cd yarntest
+yarn add react || fail_with_log

end_to_end_tests/data/start-ubuntu.sh

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+#!/bin/bash
+# Starts an Ubuntu Docker container and runs the Yarn end-to-end test on it
+set -ex
+
+if [ -z "$1" ]; then
+  echo 'Ubuntu distribution was not specified'
+  exit 1
+fi;
+
+data_path=$(dirname $(readlink -f "$0"))
+docker run -v $data_path:/data -w=/data -e APT_PROXY=$APT_PROXY $1 /data/run-ubuntu.sh

end_to_end_tests/test-ubuntu-12.04.sh

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+#!/bin/bash
+# Starts an Ubuntu 12.04 Docker container and runs the Yarn end-to-end test on it
+set -ex
+./data/start-ubuntu.sh ubuntu:12.04

end_to_end_tests/test-ubuntu-14.04.sh

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+#!/bin/bash
+# Starts an Ubuntu 14.04 Docker container and runs the Yarn end-to-end test on it
+set -ex
+./data/start-ubuntu.sh ubuntu:14.04

end_to_end_tests/test-ubuntu-16.04.sh

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+#!/bin/bash
+# Starts an Ubuntu 16.04 Docker container and runs the Yarn end-to-end test on it
+set -ex
+./data/start-ubuntu.sh ubuntu:16.04