Skeleton for target and source branches

.drone.yml

@@ -6,6 +6,9 @@ pipeline:
   test:
     image: golang:1.12.4
     commands:
+      - echo $CI_COMMIT_REF
+      - echo $CI_COMMIT_REFSPEC
+      - echo $DRONE_BRANCH
       - go test -cover -timeout 30s $(go list ./...)
 
   test_postgres:

cncd/pipeline/pipeline/frontend/metadata.go

@@ -205,6 +205,8 @@ func (m *Metadata) EnvironDrone() map[string]string {
 		"DRONE_JOB_NUMBER":           fmt.Sprintf("%d", m.Job.Number),
 		"DRONE_JOB_STARTED":          fmt.Sprintf("%d", m.Curr.Started), // ISSUE: no job started
 		"DRONE_BRANCH":               m.Curr.Commit.Branch,
+		"DRONE_TARGET_BRANCH":        m.Curr.Commit.Branch,
+		"DRONE_SOURCE_BRANCH":        m.Curr.Commit.Branch,
 		"DRONE_COMMIT":               m.Curr.Commit.Sha,
 		"DRONE_VERSION":              m.Sys.Version,
 		"DRONE_DEPLOY_TO":            m.Curr.Target,

docs/usage/pipeline.md

@@ -687,6 +687,8 @@ This is the reference list of all environment variables available to your build
 | `DRONE_JOB_STARTED`          | job started                            |
 | `DRONE_JOB_FINISHED`         | job finished                           |
 | `DRONE_BRANCH`               | commit branch                          |
+| `DRONE_TARGET_BRANCH`        | The target branch of a Pull Request    |
+| `DRONE_SOURCE_BRANCH`        | The source branch of a Pull Request    |
 | `DRONE_COMMIT`               | commit sha                             |
 | `DRONE_TAG`                  | commit tag                             |
 | `DRONE_PULL_REQUEST`         | pull request number                    |