[BEAM-4496] Fix #3 for branch fetch failure on job_PostCommit_Website_Publish

[alanmyrvold]

Still failing:
https://builds.apache.org/job/beam_PostCommit_Website_Publish/57/
05:01:02 git fetch https://gitbox.apache.org/repos/asf/beam.git asf-site
05:01:02 Starting process 'command 'sh''. Working directory: /home/jenkins/jenkins-slave/workspace/beam_PostCommit_Website_Publish/src/website Command: sh -c git fetch https://gitbox.apache.org/repos/asf/beam.git asf-site
05:01:02 Successfully started process 'command 'sh''
05:01:02 From https://gitbox.apache.org/repos/asf/beam
05:01:02 * branch asf-site -> FETCH_HEAD
05:01:02 :beam-website:commitWebsite (Thread[Task worker for ':' Thread 11,5,main]) completed. Took 1.494 secs.
05:01:02
05:01:02 FAILURE: Build failed with an exception.
05:01:02
05:01:02 * Where:
05:01:02 Build file '/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Website_Publish/src/website/build.gradle' line: 130
05:01:02
05:01:02 * What went wrong:
05:01:02 Execution failed for task ':beam-website:commitWebsite'.
05:01:02 > org.eclipse.jgit.api.errors.RefNotFoundException: Ref asf-site cannot be resolved
05:01:02

Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---	---	---	---	---
Java
Python		---			---	---	---

[alanmyrvold]

+R: @swegner PTAL? Still failing. Mysterious why it succeeds as a pull request.

[swegner]

I was able to reproduce this by doing a single-branch clone of beam and then running the build:

git clone --single-branch --branch master git@github.com:apache/beam.git .
./gradlew :beam-website:commitWebsite -x :beam-website:testWebsite --scan

https://gradle.com/s/7zo63xrlmsomg

It seems asf-site cannot be resolved unless it is an existing branch. I suspect there's no mapping for it in the remote config. Let me try some more git kung-fu.. https://github.com/alanmyrvold/beam/pull/4

[swegner]

cc @Ardagan