ci: travis infrastructure and bazel.build target to validate protos build. (#18)

This is a slimmed down version of what we have for
https://github.com/lyft/envoy/.

.travis.yml

@@ -0,0 +1,15 @@
+language: minimal
+sudo: required
+services:
+  - docker
+install:
+  - gem install travis --no-rdoc --no-ri
+matrix:
+  fast_finish: true
+env:
+  - TEST_TYPE=bazel.build
+script: ./ci/ci_steps.sh
+
+branches:
+  only:
+    - master

ci/build_setup.sh

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+#!/bin/bash
+
+# Configure environment variables for Bazel build and test.
+
+set -e
+
+NUM_CPUS=`grep -c ^processor /proc/cpuinfo`
+
+export ENVOY_SRCDIR=/source
+
+export BUILD_DIR=/build
+if [[ ! -d "${BUILD_DIR}" ]]
+then
+  echo "${BUILD_DIR} mount missing - did you forget -v <something>:${BUILD_DIR}?"
+  exit 1
+fi
+
+# Environment setup.
+export USER=bazel
+export TEST_TMPDIR=/build/tmp
+export BAZEL="bazel"
+
+# Not sandboxing, since non-privileged Docker can't do nested namespaces.
+BAZEL_OPTIONS="--package_path %workspace%:/source"
+export BAZEL_QUERY_OPTIONS="${BAZEL_OPTIONS}"
+export BAZEL_BUILD_OPTIONS="--strategy=Genrule=standalone --spawn_strategy=standalone \
+  --verbose_failures ${BAZEL_OPTIONS} --jobs=${NUM_CPUS}"
+export BAZEL_TEST_OPTIONS="${BAZEL_BUILD_OPTIONS} --cache_test_results=no --test_output=all"
+[[ "${BAZEL_EXPUNGE}" == "1" ]] && "${BAZEL}" clean --expunge
+
+function cleanup() {
+  # Remove build artifacts. This doesn't mess with incremental builds as these
+  # are just symlinks.
+  rm -f "${ENVOY_SRCDIR}"/bazel-*
+}
+trap cleanup EXIT

ci/ci_steps.sh

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+#!/bin/bash
+
+# Script that lists all the steps take by the CI system when doing Envoy builds.
+set -e
+
+# We reuse the https://github.com/lyft/envoy/ CI image here to get Bazel.
+ENVOY_BUILD_SHA=22c55f8ec756c5ddeb26c3424e128a91aec23116
+
+# Lint travis file.
+travis lint .travis.yml --skip-completion-check
+
+# Where the Envoy build takes place.
+export ENVOY_API_BUILD_DIR=/tmp/envoy-api-docker-build
+
+# Do a build matrix with different types of builds docs, coverage, bazel.release, etc.
+docker run -t -i -v "$ENVOY_API_BUILD_DIR":/build -v $TRAVIS_BUILD_DIR:/source \
+  lyft/envoy-build:$ENVOY_BUILD_SHA /bin/bash -c "cd /source && ci/do_ci.sh $TEST_TYPE"

ci/do_ci.sh

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+#!/bin/bash
+
+# Run a CI build/test target, e.g. docs, asan.
+
+set -e
+
+. "$(dirname "$0")"/build_setup.sh
+
+echo "building using ${NUM_CPUS} CPUs"
+
+if [[ "$1" == "bazel.build" ]]; then
+  echo "bazel build..."
+  bazel --batch build ${BAZEL_BUILD_OPTIONS} //...
+  exit 0
+else
+  echo "Invalid do_ci.sh target, see ci/README.md for valid targets."
+  exit 1
+fi

ci/run_envoy_docker.sh

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+#!/bin/bash
+
+set -e
+
+[[ -z "${IMAGE_ID}" ]] && IMAGE_ID="latest"
+[[ -z "${ENVOY_API_DOCKER_BUILD_DIR}" ]] && ENVOY_API_DOCKER_BUILD_DIR=/tmp/envoy-api-docker-build
+
+mkdir -p "${ENVOY_API_DOCKER_BUILD_DIR}"
+docker pull lyft/envoy-build:"${IMAGE_ID}"
+docker run -t -i -u $(id -u):$(id -g) -v "${ENVOY_API_DOCKER_BUILD_DIR}":/build \
+  -v "$PWD":/source lyft/envoy-build:"${IMAGE_ID}" /bin/bash -c "cd source && $*"