added note about docker and go dependency to the readme

Makefile

@@ -82,9 +82,6 @@ endif
 
 static: prog/static.go
 
-prog/static.go: client/build/app.js
-	esc -o $@ -prefix client/build client/build
-
 ifeq ($(BUILD_IN_CONTAINER),true)
 client/build/app.js: $(shell find client/app/scripts -type f) $(SCOPE_UI_BUILD_UPTODATE)
 	mkdir -p client/build
@@ -106,9 +103,21 @@ client-start: $(SCOPE_UI_BUILD_UPTODATE)
 	$(SUDO) docker run $(RM) $(RUN_FLAGS) --net=host -v $(shell pwd)/client/app:/home/weave/app \
 		-v $(shell pwd)/client/build:/home/weave/build \
 		$(SCOPE_UI_BUILD_IMAGE) npm start
+
+prog/static.go: client/build/app.js $(SCOPE_BACKEND_BUILD_UPTODATE)
+	$(SUDO) docker run $(RM) $(RUN_FLAGS) --net=host \
+		-v $(shell pwd):/go/src/github.com/weaveworks/scope \
+		-v $(shell pwd)/.pkg:/go/pkg \
+		-w /go/src/github.com/weaveworks/scope \
+		--entrypoint=make \
+		$(SCOPE_BACKEND_BUILD_IMAGE) BUILD_IN_CONTAINER=false prog/static.go
+
 else
 client/build/app.js:
 	cd client && npm run build
+
+prog/static.go: client/build/app.js
+	esc -o $@ -prefix client/build client/build
 endif
 
 $(SCOPE_UI_BUILD_UPTODATE): client/Dockerfile client/package.json client/webpack.local.config.js client/webpack.production.config.js client/server.js client/.eslintrc
@@ -129,5 +138,4 @@ deps:
 	$(GO) get -u -f -tags netgo \
 		github.com/FiloSottile/gvt \
 		github.com/mattn/goveralls \
-		github.com/mjibson/esc \
 		github.com/weaveworks/github-release

README.md

@@ -217,14 +217,16 @@ kubectl create -f scope-probe-ds.yaml
 
 ## <a name="developing"></a>Developing
 
-The build is in two stages. `make deps` installs some tools we use later in
-the build. `make` builds the UI build container, builds the UI in said
-container, builds the backend build container, builds the app and probe in a
-said container, and finally pushes the lot into a Docker image called
-**weaveworks/scope**.
+Building Scope from source depends on the latest version of
+[docker](https://www.docker.com/), so please install that before
+proceeding.
+
+The main build is `make`, which builds the UI build container, builds
+the UI in said container, builds the backend build container, builds
+the app and probe in a said container, and finally pushes the lot into
+a Docker image called **weaveworks/scope**.
 
 ```
-make deps
 make
 ```
 
@@ -234,6 +236,15 @@ Then, run the local build via
 ./scope launch
 ```
 
+If needed, install tools used for managing dependencies, managing releases, and doing coverage analysis via
+
+```
+make deps
+```
+
+Note that the tools from `make deps` will depend on a local install of
+[go](https://golang.org).
+
 ## <a name="developing"></a>Debugging
 
 Scope has a collection of built in debugging tools to aid Scope delevopers.

backend/Dockerfile

@@ -3,8 +3,9 @@ ENV GO15VENDOREXPERIMENT 1
 RUN apt-get update && apt-get install -y libpcap-dev python-requests time
 RUN go clean -i net && go install -tags netgo std &&  go install -race -tags netgo std
 RUN go get -tags netgo \
-		github.com/golang/lint/golint \
 		github.com/fzipp/gocyclo \
-		github.com/kisielk/errcheck
+		github.com/golang/lint/golint \
+		github.com/kisielk/errcheck \
+		github.com/mjibson/esc
 COPY build.sh /
 ENTRYPOINT ["/build.sh"]