Add a gendocs pre-submit hook.

hack/run-gendocs.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+kube::golang::setup_env
+"${KUBE_ROOT}/hack/build-go.sh" cmd/gendocs
+
+# Get the absolute path of the directory component of a file, i.e. the
+# absolute path of the dirname of $1.
+get_absolute_dirname() {
+  echo "$(cd "$(dirname "$1")" && pwd)"
+}
+
+# Detect the OS name/arch so that we can find our binary
+case "$(uname -s)" in
+  Darwin)
+    host_os=darwin
+    ;;
+  Linux)
+    host_os=linux
+    ;;
+  *)
+    echo "Unsupported host OS.  Must be Linux or Mac OS X." >&2
+    exit 1
+    ;;
+esac
+
+case "$(uname -m)" in
+  x86_64*)
+    host_arch=amd64
+    ;;
+  i?86_64*)
+    host_arch=amd64
+    ;;
+  amd64*)
+    host_arch=amd64
+    ;;
+  arm*)
+    host_arch=arm
+    ;;
+  i?86*)
+    host_arch=x86
+    ;;
+  *)
+    echo "Unsupported host arch. Must be x86_64, 386 or arm." >&2
+    exit 1
+    ;;
+esac
+
+# Find binary
+locations=(
+  "${KUBE_ROOT}/_output/dockerized/bin/${host_os}/${host_arch}/gendocs"
+  "${KUBE_ROOT}/_output/local/bin/${host_os}/${host_arch}/gendocs"
+  "${KUBE_ROOT}/platforms/${host_os}/${host_arch}/gendocs"
+)
+gendocs=$( (ls -t "${locations[@]}" 2>/dev/null || true) | head -1 )
+
+if [[ ! -x "$gendocs" ]]; then
+  {
+    echo "It looks as if you don't have a compiled gendocs binary"
+    echo
+    echo "If you are running from a clone of the git repo, please run"
+    echo "'./hack/build-go.sh cmd/gendocs'."
+  } >&2
+  exit 1
+fi
+
+
+KUBECTL_DOC="docs/kubectl.md"
+${gendocs} > ${KUBECTL_DOC}
+