golang Dockerfile now using multistage build

.circleci/config.yml

@@ -0,0 +1,37 @@
+# Javascript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      - image: circleci/node:8.11
+
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/mongo:3.4.4
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "package.json" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: yarn install
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "package.json" }}
+
+      # run tests!
+      - run: yarn test

generators/app/templates/go/Dockerfile

@@ -1,4 +1,8 @@
-FROM golang
+FROM golang AS build-stage
 COPY . /go/src/github.com/<%= projectName %>
 RUN go install github.com/<%= projectName %>
-ENTRYPOINT /go/bin/<%= projectName %>
+
+FROM alpine
+WORKDIR /app
+COPY --from=build-stage /go/bin/<%= projectName %> /app/
+ENTRYPOINT /app/<%= projectName %>

test/golangtests.js

@@ -66,15 +66,17 @@ describe('Golang project file creation (Non Web project)', function () {
         var currentFolder = process.cwd().split(path.sep).pop();
         assert.fileContent('Dockerfile.debug', 'COPY . /go/src/github.com/' + currentFolder);
         assert.fileContent('Dockerfile.debug', 'RUN go install github.com/' + currentFolder);
-        assert.fileContent('Dockerfile.debug', 'ENTRYPOINT /go/bin/' + currentFolder);
+        assert.fileContent('Dockerfile.debug', 'COPY --from=build-stage /go/bin/' + currentFolder + ' /app/')
+        assert.fileContent('Dockerfile.debug', 'ENTRYPOINT /app/' + currentFolder);
         done();
     });
 
     it('correct dockerfile contents (release)', function (done) {
         var currentFolder = process.cwd().split(path.sep).pop();
         assert.fileContent('Dockerfile', 'COPY . /go/src/github.com/' + currentFolder);
         assert.fileContent('Dockerfile', 'RUN go install github.com/' + currentFolder);
-        assert.fileContent('Dockerfile', 'ENTRYPOINT /go/bin/' + currentFolder);
+        assert.fileContent('Dockerfile', 'COPY --from=build-stage /go/bin/' + currentFolder + ' /app/')
+        assert.fileContent('Dockerfile', 'ENTRYPOINT /app/' + currentFolder);
         done();
     });
 
@@ -155,15 +157,17 @@ describe('Golang project file creation (Web project)', function () {
         var currentFolder = process.cwd().split(path.sep).pop();
         assert.fileContent('Dockerfile.debug', 'COPY . /go/src/github.com/' + currentFolder);
         assert.fileContent('Dockerfile.debug', 'RUN go install github.com/' + currentFolder);
-        assert.fileContent('Dockerfile.debug', 'ENTRYPOINT /go/bin/' + currentFolder);
+        assert.fileContent('Dockerfile.debug', 'COPY --from=build-stage /go/bin/' + currentFolder + ' /app/')
+        assert.fileContent('Dockerfile.debug', 'ENTRYPOINT /app/' + currentFolder);
         done();
     });
 
     it('correct dockerfile contents (release)', function (done) {
         var currentFolder = process.cwd().split(path.sep).pop();
         assert.fileContent('Dockerfile', 'COPY . /go/src/github.com/' + currentFolder);
         assert.fileContent('Dockerfile', 'RUN go install github.com/' + currentFolder);
-        assert.fileContent('Dockerfile', 'ENTRYPOINT /go/bin/' + currentFolder);
+        assert.fileContent('Dockerfile', 'COPY --from=build-stage /go/bin/' + currentFolder + ' /app/')
+        assert.fileContent('Dockerfile', 'ENTRYPOINT /app/' + currentFolder);
         done();
     });