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make go_container.sh standalone, improve comments

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BenTheElder committed Jul 11, 2019
1 parent fd75961 commit d92350012c175253127cf71403a44fd386f4e73a
Showing with 51 additions and 103 deletions.
  1. +51 −20 hack/build/go_container.sh
  2. +0 −44 hack/build/goarch.sh
  3. +0 −39 hack/build/goos.sh
@@ -18,51 +18,81 @@
set -o nounset
set -o errexit

# get and go to the repo root
REPO_ROOT="${REPO_ROOT:-$(git rev-parse --show-toplevel)}"
# get the repo root for defaulting OUT_DIR and SOURCE_DIR
# we assume the repo root is two levels up from this script
REPO_ROOT="${REPO_ROOT:-$(cd "$(dirname "$0")/../.." && pwd)}"

# autodetect host GOOS and GOARCH if not set, even if go is not installed
# TODO(bentheelder): maybe we should just inline this and remove REPO_ROOT
GOOS="${GOOS:-$("${REPO_ROOT}/hack/build/goos.sh")}"
GOARCH="${GOARCH:-$("${REPO_ROOT}/hack/build/goarch.sh")}"

# use the official module proxy by default
# ============================ SCRIPT SETTINGS =================================
# output directory, will be mounted to /out, defaults to /bin in REPO_ROOT
OUT_DIR="${OUT_DIR:-${REPO_ROOT}/bin}"
# source directory, will be mounted to /src, defaults to REPO_ROOT
SOURCE_DIR="${SOURCE_DIR:-${REPO_ROOT}}"
# GOPROXY is respected by go, use the official module proxy by default
# this helps make our build more reproducible and reliable
GOPROXY="${GOPROXY:-https://proxy.golang.org}"
# the container image, by default a recent official golang image
GOIMAGE="${GOIMAGE:-golang:1.12.7}"
# ========================== END SCRIPT SETTINGS ===============================

# default build image
GOVERSION="${GOVERSION:-1.12.7}"
GOIMAGE="golang:${GOVERSION}"
# autodetects and host GOOS and GOARCH and sets them if not set
# works even if go is not installed on the host
detect_and_set_goos_goarch() {
# if we have go, just ask go! NOTE: this respects explicitly set GOARCH / GOOS
if which go >/dev/null 2>&1; then
GOARCH=$(go env GOARCH)
GOOS=$(go env GOOS)
return
fi

# docker volume name, used as a go module / build cache
CACHE_VOLUME="kind-build-cache"
# detect GOOS equivalent if unset
if [ -z "${GOOS:-}" ]; then
case "$(uname -s)" in
Darwin) GOOS="darwin" ;;
Linux) GOOS="linux" ;;
*) echo "Unknown host OS! '$(uname -s)'" exit 2 ;;
esac
fi

# output directory
OUT_DIR="${OUT_DIR:-${REPO_ROOT}/bin}"
# source directory
SOURCE_DIR="${SOURCE_DIR:-${REPO_ROOT}}"
# detect GOARCH equivalent if unset
if [ -z "${GOARCH:-}" ]; then
case "$(uname -m)" in
x86_64) GOARCH="amd64" ;;
arm*)
GOARCH="arm"
if [ "$(getconf LONG_BIT)" = "64" ]; then
GOARCH="arm64"
fi
;;
*) echo "Unknown host architecture! '$(uname -m)'" exit 2 ;;
esac
fi
}

# creates the output directory
make_out_dir() {
mkdir -p "${OUT_DIR}"
}

# docker volume name, used as a go module / build cache
__CACHE_VOLUME__="kind-build-cache"

# creates the cache volume
make_cache_volume() {
docker volume create "${CACHE_VOLUME}" >/dev/null
docker volume create "${__CACHE_VOLUME__}" >/dev/null
}

# runs $@ in a go container with caching etc. and the repo mount to /src
run_in_go_container() {
# get user id and group id so we can run the container
# get host user id and group id so we can run the container as them
# this ensures sane file ownership for build outputs
_UID=$(id -u)
_GID=$(id -g)
# run in the container
docker run \
`# ensure the container is removed on exit` \
--rm \
`# use the cache volume for go` \
-v "${CACHE_VOLUME}:/go" \
-v "${__CACHE_VOLUME__}:/go" \
-e GOCACHE=/go/cache \
`# mount the output & repo dir, set working directory to the repo` \
-v "${OUT_DIR}:/out" \
@@ -88,4 +118,5 @@ run_in_go_container() {

make_out_dir
make_cache_volume
detect_and_set_goos_goarch
run_in_go_container "$@"

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