Update version.json before taskboot build

Author: EvaBardou

.taskcluster.yml

@@ -295,17 +295,13 @@ tasks:
                   GIT_REPOSITORY: ${repository}
                   GIT_REVISION: ${head_rev}
                 command:
-                  - taskboot
-                  - build
-                  - --image
-                  - mozilla/code-review
-                  - --tag
-                  - "${channel}"
-                  - --tag
+                  - bash
+                  - backend/build.sh
                   - "${head_rev}"
-                  - --write
-                  - /backend.tar
-                  - backend/Dockerfile
+                  - "${head_branch}"
+                  - "${repository}"
+                  - "${taskcluster_root_url}/tasks/{$eval: as_slugid('backend_build')}"
+                  - "${channel}"
                 artifacts:
                   public/code-review-backend.tar:
                     expires: {$fromNow: '2 weeks'}

backend/build.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+COMMIT_SHA=$1
+VERSION=$2
+SOURCE=$3
+BUILD_URL=$4
+CHANNEL=$5
+
+# create a version.json per https://github.com/mozilla-services/Dockerflow/blob/master/docs/version_object.md
+printf '{"commit": "%s", "version": "%s", "source": "%s", "build": "%s"}\n' \
+"$COMMIT_SHA" \
+"$VERSION" \
+"$SOURCE" \
+"$BUILD_URL" > backend/code_review_backend/version.json
+
+taskboot build --image mozilla/code-review --tag "$CHANNEL" --tag "$COMMIT_SHA" --write /backend.tar backend/Dockerfile

backend/code_review_backend/version.json

@@ -3,4 +3,4 @@
   "version": "stub",
   "source": "https://github.com/mozilla/code-review",
   "build": "https://tools.taskcluster.net/task-inspector/#XXXXXXXXXXXXXXXXXX"
-}
+}