buildkit/hack/util

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#!/usr/bin/env sh
: ${PREFER_BUILDCTL=}
: ${PREFER_LEGACY=}
: ${TRAVIS_EVENT_TYPE=}
: ${TRAVIS_BRANCH=}
newerEqualThan() { # $1=minimum wanted version $2=actual-version
[ "$1" = "$(printf "$1\n$2" | sort -V | head -n 1)" ]
}
buildmode="legacy"
if [ "$PREFER_BUILDCTL" = "1" ]; then
buildmode="buildkit";
else
serverVersion=$(docker info --format '{{.ServerVersion}}')
experimental=$(docker info --format '{{.ExperimentalBuild}}')
if [ "$PREFER_LEGACY" != "1" ] && ( newerEqualThan "18.09" $serverVersion || \
( newerEqualThan "18.06" $serverVersion && [ "true" = "$experimental" ] ) || \
[ "$DOCKER_BUILDKIT" = "1" ]); then
buildmode="docker-buildkit";
fi
fi
if [ "$buildmode" = "legacy" ]; then
echo "\"legacy\" buildmode is no longer supported. Please enable DOCKER_BUILDKIT or install standalone BuildKit." >&2
exit 1
fi
cacheref=""
currentref=""
if [ "$TRAVIS_EVENT_TYPE" == "pull_request" ]; then
currentref="git://github.com/moby/buildkit#refs/pull/$TRAVIS_PULL_REQUEST/merge"
cacheref="cicache.buildk.it/moby/buildkit/pr$TRAVIS_BUILD_ID"
elif [ -n "$TRAVIS_BRANCH" ]; then
currentref="git://github.com/moby/buildkit#$TRAVIS_BRANCH"
fi
currentcontext="."
currentcontextBuildctl="--local context=. --local dockerfile=."
if [ -n "$currentref" ]; then
currentcontext="--build-arg BUILDKIT_CONTEXT_KEEP_GIT_DIR=1 $currentref"
currentcontextBuildctl="--opt context=$currentref --opt build-arg:BUILDKIT_CONTEXT_KEEP_GIT_DIR=1"
fi