Add script to make a Go-style workspace for Soong

Test: ./scripts/setup_go_workspace_for_soong.sh

Change-Id: If091175d3b69976d3e1488304c4274296cc8afb4

scripts/setup_go_workspace_for_soong.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+set -e
+
+#mounts the components of soong into a directory structure that Go tools and editors expect
+
+#move to the script's directory
+cd "$(dirname $0)"
+SCRIPT_PATH="$PWD"
+
+#find the root of the Repo checkout
+cd "${SCRIPT_PATH}"/../../..
+ANDROID_PATH="${PWD}"
+OUTPUT_PATH="$(echo ${GOPATH} | sed 's/\:.*//')" #if GOPATH contains multiple paths, use the first one
+
+if [ -z "${OUTPUT_PATH}" ]; then
+  echo "Error; could not determine the desired location at which to create a Go-compatible workspace. Please update GOPATH to specify the desired destination directory"
+  exit 1
+fi
+
+function confirm() {
+  while true; do
+    echo "Will create GOPATH-compatible directory structure at ${OUTPUT_PATH}"
+    echo -n "Ok [Y/n]?"
+    read decision
+    if [ "${decision}" == "y" -o "${decision}" == "Y" -o "${decision}" == "" ]; then
+      return 0
+    else
+      if [ "${decision}" == "n" ]; then
+        return 1
+      else
+        echo "Invalid choice ${decision}; choose either 'y' or 'n'"
+      fi
+    fi
+  done
+}
+
+function bindAll() {
+  bindOne "${ANDROID_PATH}/build/blueprint" "${OUTPUT_PATH}/src/github.com/google/blueprint"
+  bindOne "${ANDROID_PATH}/build/soong" "${OUTPUT_PATH}/src/android/soong"
+
+  bindOne "${ANDROID_PATH}/art/build" "${OUTPUT_PATH}/src/android/soong/art"
+  bindOne "${ANDROID_PATH}/external/llvm/soong" "${OUTPUT_PATH}/src/android/soong/llvm"
+  bindOne "${ANDROID_PATH}/external/clang/soong" "${OUTPUT_PATH}/src/android/soong/clang"
+  echo
+  echo "Created GOPATH-compatible directory structure at ${OUTPUT_PATH}"
+}
+
+function bindOne() {
+  #causes $newPath to mirror $existingPath
+  existingPath="$1"
+  newPath="$2"
+  mkdir -p "$newPath"
+  echoAndDo bindfs "${existingPath}" "${newPath}"
+}
+
+function echoAndDo() {
+  echo "$@"
+  eval "$@"
+}
+
+if confirm; then
+  echo
+  bindAll
+else
+  echo "skipping due to user request"
+  exit 1
+fi