Make building contrib code optional

build/common.sh

@@ -304,10 +304,9 @@ function kube::build::ensure_golang() {
   }
 }
 
-# Set up the context directory for the kube-build image and build it.
-function kube::build::build_image() {
-  local -r build_context_dir="${LOCAL_OUTPUT_IMAGE_STAGING}/${KUBE_BUILD_IMAGE}"
-  local -r source=(
+# The set of source targets to include in the kube-build image
+function kube::build::source_targets() {
+  local targets=(
     api
     build
     cmd
@@ -323,11 +322,22 @@ function kube::build::build_image() {
     test
     third_party
   )
+  if [ -n "${KUBERNETES_CONTRIB:-}" ]; then
+    for contrib in "${KUBERNETES_CONTRIB}"; do
+      targets+=($(eval "kube::contrib::${contrib}::source_targets"))
+    done
+  fi
+  echo "${targets[@]}"
+}
+
+# Set up the context directory for the kube-build image and build it.
+function kube::build::build_image() {
+  local -r build_context_dir="${LOCAL_OUTPUT_IMAGE_STAGING}/${KUBE_BUILD_IMAGE}"
 
   kube::build::build_image_cross
 
   mkdir -p "${build_context_dir}"
-  tar czf "${build_context_dir}/kube-source.tar.gz" "${source[@]}"
+  tar czf "${build_context_dir}/kube-source.tar.gz" $(kube::build::source_targets)
 
   kube::version::get_version_vars
   kube::version::save_version_vars "${build_context_dir}/kube-version-defs"
@@ -415,6 +425,10 @@ function kube::build::run_build_command() {
     "${DOCKER_MOUNT_ARGS[@]}"
   )
 
+  if [ -n "${KUBERNETES_CONTRIB:-}" ]; then
+    docker_run_opts+=(-e "KUBERNETES_CONTRIB=${KUBERNETES_CONTRIB}")
+  fi
+
   # If we have stdin we can run interactive.  This allows things like 'shell.sh'
   # to work.  However, if we run this way and don't have stdin, then it ends up
   # running in a daemon-ish mode.  So if we don't have a stdin, we explicitly

hack/lib/golang.sh

@@ -18,8 +18,16 @@
 readonly KUBE_GO_PACKAGE=github.com/GoogleCloudPlatform/kubernetes
 readonly KUBE_GOPATH="${KUBE_OUTPUT}/go"
 
+# Load contrib target functions
+if [ -n "${KUBERNETES_CONTRIB:-}" ]; then
+  for contrib in "${KUBERNETES_CONTRIB}"; do
+    source "${KUBE_ROOT}/contrib/${contrib}/target.sh"
+  done
+fi
+
 # The set of server targets that we are only building for Linux
-readonly KUBE_SERVER_TARGETS=(
+kube::golang::server_targets() {
+  local targets=(
     cmd/kube-proxy
     cmd/kube-apiserver
     cmd/kube-controller-manager
@@ -27,7 +35,15 @@ readonly KUBE_SERVER_TARGETS=(
     cmd/hyperkube
     cmd/kubernetes
     plugin/cmd/kube-scheduler
-)
+  )
+  if [ -n "${KUBERNETES_CONTRIB:-}" ]; then
+    for contrib in "${KUBERNETES_CONTRIB}"; do
+      targets+=($(eval "kube::contrib::${contrib}::server_targets"))
+    done
+  fi
+  echo "${targets[@]}"
+}
+readonly KUBE_SERVER_TARGETS=($(kube::golang::server_targets))
 readonly KUBE_SERVER_BINARIES=("${KUBE_SERVER_TARGETS[@]##*/}")
 
 # The server platform we are building on.
@@ -43,7 +59,8 @@ readonly KUBE_CLIENT_BINARIES=("${KUBE_CLIENT_TARGETS[@]##*/}")
 readonly KUBE_CLIENT_BINARIES_WIN=("${KUBE_CLIENT_BINARIES[@]/%/.exe}")
 
 # The set of test targets that we are building for all platforms
-readonly KUBE_TEST_TARGETS=(
+kube::golang::test_targets() {
+  local targets=(
     cmd/integration
     cmd/gendocs
     cmd/genman
@@ -53,7 +70,15 @@ readonly KUBE_TEST_TARGETS=(
     examples/k8petstore/web-server
     github.com/onsi/ginkgo/ginkgo
     test/e2e/e2e.test
-)
+  )
+  if [ -n "${KUBERNETES_CONTRIB:-}" ]; then
+    for contrib in "${KUBERNETES_CONTRIB}"; do
+      targets+=($(eval "kube::contrib::${contrib}::test_targets"))
+    done
+  fi
+  echo "${targets[@]}"
+}
+readonly KUBE_TEST_TARGETS=($(kube::golang::test_targets))
 readonly KUBE_TEST_BINARIES=("${KUBE_TEST_TARGETS[@]##*/}")
 readonly KUBE_TEST_BINARIES_WIN=("${KUBE_TEST_BINARIES[@]/%/.exe}")
 readonly KUBE_TEST_PORTABLE=(