feat: Add support for mdbook (#38)

This should help simplify downloading mdbook and serving the book
locally.

Author: joekr

Makefile

@@ -225,6 +225,14 @@ rm -rf $$TMP_DIR ;\
 }
 endef
 
+MDBOOK = /tmp/mdbook
+.PHONY: build-book
+build-book: ## Download mdbook locally if necessary.
+	docs/build.sh
+
+.PHONY: serve-book
+serve-book: build-book ## Build and serve the book with live-reloading enabled
+	$(MDBOOK) serve docs
 
 ## --------------------------------------
 ## e2e

docs/build.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# Copyright 2019 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+os=$(go env GOOS)
+arch=$(go env GOARCH)
+
+MDBOOK_VERSION="0.4.15"
+
+# translate arch to rust's conventions (if we can)
+if [[ ${arch} == "amd64" ]]; then
+    arch="x86_64"
+elif [[ ${arch} == "x86" ]]; then
+    arch="i686"
+fi
+
+# translate os to rust's conventions (if we can)
+ext="tar.gz"
+cmd="tar -C /tmp -xzvf"
+case ${os} in
+    windows)
+        target="pc-windows-msvc"
+        ext="zip"
+        cmd="unzip -d /tmp"
+        ;;
+    darwin)
+        target="apple-darwin"
+        ;;
+    linux)
+        # works for linux, too
+        target="unknown-${os}-gnu"
+        ;;
+    *)
+        target="unknown-${os}"
+        ;;
+esac
+
+# grab mdbook
+# we hardcode linux/amd64 since rust uses a different naming scheme and it's a pain to tran
+echo "downloading mdBook-v${MDBOOK_VERSION}-${arch}-${target}.${ext}"
+set -x
+curl -sL -o /tmp/mdbook.${ext} "https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdBook-v${MDBOOK_VERSION}-${arch}-${target}.${ext}"
+${cmd} /tmp/mdbook.${ext}
+chmod +x /tmp/mdbook
+
+# Finally build the book.
+(cd docs && /tmp/mdbook build)