From c1b500665f0afe422a6f97a6b5ba22337c03e22a Mon Sep 17 00:00:00 2001
From: Lucas Lara <lucaslorentzlara@hotmail.com>
Date: Fri, 12 May 2017 21:31:08 +0200
Subject: [PATCH] Expose parent build number

---
 drone/exec/exec.go | 5 +++++
 server/hook.go     | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drone/exec/exec.go b/drone/exec/exec.go
index d99d26ecf..f47ec3294 100644
--- a/drone/exec/exec.go
+++ b/drone/exec/exec.go
@@ -144,6 +144,10 @@ var Command = cli.Command{
 			Name:   "build-number",
 			EnvVar: "DRONE_BUILD_NUMBER",
 		},
+		cli.IntFlag{
+			Name:   "parent-build-number",
+			EnvVar: "DRONE_PARENT_BUILD_NUMBER",
+		},
 		cli.Int64Flag{
 			Name:   "build-created",
 			EnvVar: "DRONE_BUILD_CREATED",
@@ -389,6 +393,7 @@ func metadataFromContext(c *cli.Context) frontend.Metadata {
 		},
 		Curr: frontend.Build{
 			Number:   c.Int("build-number"),
+			Parent:   c.Int("parent-build-number"),
 			Created:  c.Int64("build-created"),
 			Started:  c.Int64("build-started"),
 			Finished: c.Int64("build-finished"),
diff --git a/server/hook.go b/server/hook.go
index bdbdc90e7..f6379d989 100644
--- a/server/hook.go
+++ b/server/hook.go
@@ -329,6 +329,7 @@ func metadataFromStruct(repo *model.Repo, build, last *model.Build, proc *model.
 		},
 		Curr: frontend.Build{
 			Number:   build.Number,
+			Parent:   build.Parent,
 			Created:  build.Created,
 			Started:  build.Started,
 			Finished: build.Finished,