Tag scope images on docker hub as we do in service (#1572)

Makefile

@@ -30,7 +30,7 @@ WITH_GO_HOST_ENV=$(NO_CROSS_COMP); $(GO_ENV)
 GO_BUILD_INSTALL_DEPS=-i
 GO_BUILD_TAGS='netgo unsafe'
 GO_BUILD_FLAGS=$(GO_BUILD_INSTALL_DEPS) -ldflags "-extldflags \"-static\" -X main.version=$(SCOPE_VERSION) -s -w" -tags $(GO_BUILD_TAGS)
-
+IMAGE_TAG=$(shell ./image-tag)
 
 all: $(SCOPE_EXPORT)
 
@@ -45,6 +45,7 @@ $(SCOPE_EXPORT): $(SCOPE_EXE) $(DOCKER_DISTRIB) docker/weave $(RUNSVINIT) docker
 	cp $(SCOPE_EXE) $(RUNSVINIT) docker/
 	cp $(DOCKER_DISTRIB) docker/docker.tgz
 	$(SUDO) docker build -t $(SCOPE_IMAGE) docker/
+	$(SUDO) docker tag $(SCOPE_IMAGE) $(SCOPE_IMAGE):$(IMAGE_TAG)
 	$(SUDO) docker save $(SCOPE_IMAGE):latest > $@
 
 $(RUNSVINIT): vendor/runsvinit/*.go

circle.yml

@@ -68,6 +68,7 @@ deployment:
           docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS &&
           (test "${DOCKER_ORGANIZATION:-$DOCKER_USER}" == "weaveworks" || docker tag weaveworks/scope:latest ${DOCKER_ORGANIZATION:-$DOCKER_USER}/scope:latest) &&
           docker push ${DOCKER_ORGANIZATION:-$DOCKER_USER}/scope
+          docker push ${DOCKER_ORGANIZATION:-$DOCKER_USER}/scope:$(./image-tag)
         )
   hub-dev:
     branch: /^((?!master).)*$/  # not the master branch

image-tag

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+WORKING_SUFFIX=$(if ! git diff --exit-code --quiet HEAD >&2; \
+                 then echo "-WIP"; \
+                 else echo ""; \
+                 fi)
+BRANCH_PREFIX=$(git rev-parse --abbrev-ref HEAD)
+echo "$BRANCH_PREFIX-$(git rev-parse --short HEAD)$WORKING_SUFFIX"