Add hack/submodule-k8s script

cluster-autoscaler/hack/submodule-k8s.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+###
+
+set -o errexit
+set -o pipefail
+
+###
+# This script is to be used as a break-glass solution if there is a breaking
+# change in a release of Kubernetes. This allows us to switch to an unreleased
+# commit by submoduling the whole k/k repository.
+###
+
+VERSION=${1}
+if [ -z "$VERSION" ]; then
+    echo "Usage: hack/submodule-k8s.sh <k8s sha>"
+    exit 1
+fi
+
+set -x
+
+MODS=($(
+    curl -sS https://raw.githubusercontent.com/kubernetes/kubernetes/${VERSION}/go.mod |
+    sed -n 's|.*k8s.io/\(.*\) => ./staging/src/k8s.io/.*|k8s.io/\1|p'
+))
+
+git submodule add --force https://github.com/kubernetes/kubernetes
+git submodule update --init --recursive --remote
+cd kubernetes
+git checkout $VERSION
+cd ..
+
+go mod edit "-replace=k8s.io/kubernetes=./kubernetes"
+
+for MOD in "${MODS[@]}"; do
+    go mod edit "-replace=${MOD}=./kubernetes/staging/src/${MOD}"
+done
+go mod vendor
+go mod tidy

cluster-autoscaler/hack/update-vendor.sh

@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 
+###
+# This script is to be used when updating Kubernetes and its staging
+# repositories to *tagged* releases. This is the ideal case, but another
+# script, submodule-k8s.sh, is available as a break-glass solution if we must
+# switch to an unreleased commit.
+###
+
 set -o errexit
 set -o pipefail
 
@@ -8,10 +15,14 @@ if [ -z "$VERSION" ]; then
     echo "Usage: hack/update-vendor.sh <k8s version>"
     exit 1
 fi
+
+set -x
+
 MODS=($(
     curl -sS https://raw.githubusercontent.com/kubernetes/kubernetes/v${VERSION}/go.mod |
     sed -n 's|.*k8s.io/\(.*\) => ./staging/src/k8s.io/.*|k8s.io/\1|p'
 ))
+
 for MOD in "${MODS[@]}"; do
     V=$(
         go mod download -json "${MOD}@kubernetes-${VERSION}" |
@@ -20,3 +31,6 @@ for MOD in "${MODS[@]}"; do
     go mod edit "-replace=${MOD}=${MOD}@${V}"
 done
 go get "k8s.io/kubernetes@v${VERSION}"
+go mod vendor
+go mod tidy
+git rm -r --force kubernetes