force GOTOOLCHAIN="go${GO_VERSION}" for now

TODO: look at using deprecating .go-version in favor of GOTOOLCHAIN existing knobs

Makefile

@@ -33,6 +33,7 @@ COMMIT_COUNT?=$(shell git describe --tags | rev | cut -d- -f2 | rev)
 # ========================= Setup Go With Gimme ================================
 # go version to use for build etc.
 # setup correct go version with gimme
+GOTOOLCHAIN:=$(shell . hack/build/gotoolchain.sh && echo "$${GOTOOLCHAIN}")
 PATH:=$(shell . hack/build/setup-go.sh && echo "$${PATH}")
 # go1.9+ can autodetect GOROOT, but if some other tool sets it ...
 GOROOT:=
@@ -40,7 +41,7 @@ GOROOT:=
 GO111MODULE=on
 # disable CGO by default for static binaries
 CGO_ENABLED=0
-export PATH GOROOT GO111MODULE CGO_ENABLED
+export PATH GOROOT GO111MODULE CGO_ENABLED GOTOOLCHAIN
 # work around broken PATH export
 SPACE:=$(subst ,, )
 SHELL:=env PATH=$(subst $(SPACE),\$(SPACE),$(PATH)) $(SHELL)

hack/build/gotoolchain.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Copyright 2020 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# script to set GOTOOLCHAIN as needed
+# MUST BE RUN FROM THE REPO ROOT DIRECTORY
+
+# read go-version file unless GO_VERSION is set
+GO_VERSION="${GO_VERSION:-"$(cat .go-version)"}"
+
+GOTOOLCHAIN="go${GO_VERSION}"
+export GOTOOLCHAIN GO_VERSION

hack/build/setup-go.sh

@@ -17,7 +17,8 @@
 # MUST BE RUN FROM THE REPO ROOT DIRECTORY
 
 # read go-version file unless GO_VERSION is set
-GO_VERSION="${GO_VERSION:-"$(cat .go-version)"}"
+# override GOTOOLCHAIN unless set as well
+. ./hack/build/gotoolchain.sh
 
 # we don't actually care where the .env files are
 # however, GIMME_SILENT_ENV doesn't trigger re-generating a .env if it

images/base/Dockerfile

@@ -115,6 +115,7 @@ RUN dpkg --add-architecture arm64 && dpkg --add-architecture amd64 \
 # set by makefile to .go-version
 ARG GO_VERSION
 RUN eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && GOBIN=/usr/local/bin go install github.com/google/go-licenses@latest
 
 
@@ -130,6 +131,7 @@ RUN git clone --filter=tree:0 "${CONTAINERD_CLONE_URL}" /containerd \
     && cd /containerd \
     && git checkout "${CONTAINERD_VERSION}" \
     && eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && export GOARCH=$TARGETARCH && export CC=$(target-cc) && export CGO_ENABLED=1 \
     && make bin/ctr bin/containerd bin/containerd-shim-runc-v2 \
     && GOARCH=$TARGETARCH go-licenses save --save_path=/_LICENSES \
@@ -144,6 +146,7 @@ RUN git clone --filter=tree:0 "${RUNC_CLONE_URL}" /runc \
     && cd /runc \
     && git checkout "${RUNC_VERSION}" \
     && eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && export GOARCH=$TARGETARCH && export CC=$(target-cc) && export CGO_ENABLED=1 \
     && make runc \
     && GOARCH=$TARGETARCH go-licenses save --save_path=/_LICENSES .
@@ -170,6 +173,7 @@ RUN git clone --filter=tree:0 "${CNI_PLUGINS_CLONE_URL}" /cni-plugins \
     && cd /cni-plugins \
     && git checkout "${CNI_PLUGINS_VERSION}" \
     && eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && mkdir ./bin \
     && export GOARCH=$TARGETARCH && export CC=$(target-cc) && export CGO_ENABLED=1 \
     && go build -o ./bin/host-local -mod=vendor ./plugins/ipam/host-local \
@@ -190,6 +194,7 @@ RUN git clone --filter=tree:0 "${CONTAINERD_FUSE_OVERLAYFS_CLONE_URL}" /fuse-ove
     && cd /fuse-overlayfs-snapshotter \
     && git checkout "${CONTAINERD_FUSE_OVERLAYFS_VERSION}" \
     && eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && export GOARCH=$TARGETARCH && export CC=$(target-cc) && export CGO_ENABLED=1 \
     && make bin/containerd-fuse-overlayfs-grpc \
     && GOARCH=$TARGETARCH go-licenses save --save_path=/_LICENSES ./cmd/containerd-fuse-overlayfs-grpc

images/kindnetd/Dockerfile

@@ -22,12 +22,14 @@ COPY go.mod go.sum ./
 # set by makefile to .go-version
 ARG GO_VERSION
 RUN eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && go mod download \
     && GOBIN=/usr/local/bin go install github.com/google/go-licenses@latest
 # build
 COPY . .
 ARG TARGETARCH
 RUN eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && CGO_ENABLED=0 GOARCH=$TARGETARCH go build -o ./kindnetd ./cmd/kindnetd \
     && GOARCH=$TARGETARCH go-licenses save --save_path=/_LICENSES ./cmd/kindnetd
 

images/local-path-provisioner/Dockerfile

@@ -20,6 +20,7 @@ ARG VERSION
 # set by makefile to .go-version
 ARG TARGETARCH GO_VERSION
 RUN eval "$(gimme "${GO_VERSION}")" \
+    && export GOTOOLCHAIN="go${GO_VERSION}" \
     && cd local-path-provisioner \
     && git fetch && git checkout "${VERSION}" \
     && GOARCH=$TARGETARCH scripts/build \