added revision hash

Dockerfile

@@ -15,6 +15,10 @@ COPY . /usr/src/app
 # Ensure the runtime of the container is in production mode.
 ENV NODE_ENV production
 
+# Store the current git revision.
+ARG REVISION_HASH
+ENV REVISION_HASH=${REVISION_HASH}
+
 # Install app dependencies and build static assets.
 RUN yarn global add node-gyp && \
     yarn install --frozen-lockfile && \

config.js

@@ -55,6 +55,10 @@ const CONFIG = {
     ? process.env.TALK_LOGGING_LEVEL
     : 'info',
 
+  // REVISION_HASH when using the docker build will contain the build hash that
+  // it was built at.
+  REVISION_HASH: process.env.REVISION_HASH,
+
   //------------------------------------------------------------------------------
   // JWT based configuration
   //------------------------------------------------------------------------------

routes/api/v1/index.js

@@ -1,10 +1,11 @@
 const express = require('express');
-const pkg = require('../../../package.json');
+const { version } = require('../../../package.json');
+const { REVISION_HASH } = require('../../../config');
 const router = express.Router();
 
 // Return the current version.
 router.get('/', (req, res) => {
-  res.json({ version: pkg.version });
+  res.json({ version, revision: REVISION_HASH });
 });
 
 router.use('/account', require('./account'));

scripts/docker.sh

@@ -54,9 +54,16 @@ deploy_branch() {
   docker push coralproject/talk:$CIRCLE_BRANCH-onbuild
 }
 
+ARGS=""
+
+if [[ -n "$CIRCLE_SHA1" ]]
+then
+  ARGS="--build-arg REVISION_HASH=${CIRCLE_SHA1}"
+fi
+
 # build the repo, including the onbuild tagged versions.
-docker build -t coralproject/talk:latest -f Dockerfile .
-docker build -t coralproject/talk:latest-onbuild -f Dockerfile.onbuild .
+docker build -t coralproject/talk:latest ${ARGS} -f Dockerfile .
+docker build -t coralproject/talk:latest-onbuild ${ARGS} -f Dockerfile.onbuild .
 
 if [ "$1" = "deploy" ]
 then
@@ -80,4 +87,4 @@ then
       deploy_branch
     fi
   fi
-fi
+fi