Auto generate Kedge JSON Schema for every merge

This commit configures Travis to run a script on every merge to
Kedge master branch which updates the JSON Schema residing in
https://github.com/kedgeproject/json-schema

Significantly improves #280

.travis.yml

@@ -17,7 +17,7 @@ env:
 matrix:
   include:
     - go: 1.7
-      env: BUILD_DOCS=yes
+      env: BUILD_DOCS=yes GENERATE_JSON_SCHEMA=yes
     - go: 1.8
     - go: 1.9
 
@@ -48,3 +48,4 @@ after_success:
   - goveralls -coverprofile=gover.coverprofile -service=travis-ci
   # sync the docs only if everything else was successful
   - ./scripts/sync-docs.sh
+  - ./scripts/update-json-schema.sh

scripts/update-json-schema.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+# Ensures that we run on Travis
+if [ "$TRAVIS_BRANCH" != "master" ] || [ "$GENERATE_JSON_SCHEMA" != "yes" ] || [ "$TRAVIS_SECURE_ENV_VARS" == "false" ] || [ "$TRAVIS_PULL_REQUEST" != "false" ] ; then
+    echo "Must be: a merged PR on the master branch, GENERATE_JSON_SCHEMA=yes, TRAVIS_SECURE_ENV_VARS=false"
+    exit 0
+fi
+
+KEDGE_REPO_NAME="kedge-json-schema"
+GENERATOR_REPO="[email protected]:kedgeproject/json-schema.git"
+DEPLOY_KEY="scripts/deploy_key"
+KEDGE_JSON_SCHEMA_IMAGE="containscafeine/kedge-json-schema:latest"
+GIT_USER="kedge-bot"
+GIT_EMAIL="[email protected]"
+OUTPUT_DIR="master"
+
+# decrypt the private key
+openssl aes-256-cbc -K $encrypted_91569b511922_key -iv $encrypted_91569b511922_iv -in "$DEPLOY_KEY.enc" -out "$DEPLOY_KEY" -d
+chmod 600 "$DEPLOY_KEY"
+eval `ssh-agent -s`
+ssh-add "$DEPLOY_KEY"
+
+# clone the JSON Schema Generator repo
+git clone "$GENERATOR_REPO" "$KEDGE_REPO_NAME"
+cd "$KEDGE_REPO_NAME"
+rm -rf "$OUTPUT_DIR"
+mkdir -p "$OUTPUT_DIR"
+docker run --rm -v "$OUTPUT_DIR":/data:Z "$KEDGE_JSON_SCHEMA_IMAGE"
+
+# add relevant user information
+git config user.name "$GIT_USER"
+
+# email assigned
+git config user.email "$GIT_EMAIL"
+git add "$OUTPUT_DIR"
+
+# Check if anything changed, and if it's the case, push to origin/master.
+if git commit -m 'Update JSON Schema' -m "Commit: https://github.com/kedgeproject/kedge/commit/$TRAVIS_COMMIT" -m "PR: https://github.com/kedgeproject/kedge/pull/$TRAVIS_PULL_REQUEST" ; then
+  git push
+fi