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[CI] Optimize external Docker build cache (#4334)

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* When building pull requests, use Docker cache for master branch

Docker build caches are per-branch, so new pull requests will initially
have no build cache, causing the Docker containers to be built from
scratch. New pull requests should use the cache associated with the
master branch. This makes sense, since most pull requests do not modify
the Dockerfile.

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This commit is contained in:
Philip Hyunsu Cho 2019-04-04 15:59:07 -07:00 committed by GitHub
parent 37c75aac41
commit 70be1e38c2
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1 changed files with 16 additions and 4 deletions
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18
tests/ci_build/ci_build.sh
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@ -122,12 +122,22 @@ echo "Building container (${DOCKER_IMG_NAME})..."
# If enviornment variable DOCKER_CACHE_REPO is set, use an external Docker repo for build caching
if [[ -n "${DOCKER_CACHE_REPO}" ]]
then
# Login for Docker registiry
# Login for Docker registry
echo '$(python3 -m awscli ecr get-login --no-include-email --region us-west-2)'
$(python3 -m awscli ecr get-login --no-include-email --region us-west-2)
echo "docker pull ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME} || true"
docker pull "${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}" || true
# Pull pre-build container from Docker build cache,
# if one exists for the particular branch or pull request
echo "docker pull ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"
if docker pull "${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"
then
CACHE_FROM_CMD="--cache-from ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"
else
# If the build cache is empty of the particular branch or pull request,
# use the build cache associated with the master branch
echo "docker pull ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:master"
docker pull "${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:master" || true
CACHE_FROM_CMD="--cache-from ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:master"
fi
else
CACHE_FROM_CMD=''
fi
@ -152,6 +162,8 @@ fi
# If enviornment variable DOCKER_CACHE_REPO is set, use an external Docker repo for build caching
if [[ -n "${DOCKER_CACHE_REPO}" ]]
then
# Push the container we just built to the Docker build cache
# that is associated with the particular branch or pull request
echo "docker tag ${DOCKER_IMG_NAME} ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"
docker tag "${DOCKER_IMG_NAME}" "${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"
echo "docker push ${DOCKER_CACHE_REPO}/${DOCKER_IMG_NAME}:${BRANCH_NAME}"