plugin breaks trying to start a git process

[rutchkiwi]

Hey!

This plugin works fine when running gradle locally, but when i try to run on our CI machine the build.gradle file can't be evaluated, and no gradle tasks at all works.

For example when running gradle tasks i get:

[Gradle] - Launching build.
[workspace] $ /var/lib/jenkins/jobs/Forecast-production-GRADLEase/workspace/gradlew -DBRANCH_TO_BUILD=gradle2 test

FAILURE: Build failed with an exception.

* Where:
Build file '/var/lib/jenkins/jobs/Forecast-production-GRADLEase/workspace/build.gradle' line: 47

* What went wrong:
A problem occurred evaluating root project 'forecast'.
> Process 'command 'git' finished with non-zero exit value 1

With --info & --debug (cut down to relevant parts) https://gist.githubusercontent.com/rutchkiwi/ac03d610bf48aea0abfb/raw/af6cfcd24018cd62d11a7bbe44f3da63eae554a0/relase-git-problem

Any ideas on how to fix this?

[nikolaylagutko]

I had the same problem with this plugin (I tried to use it with Travis-CI) and unfortunately I didn't solved it it.

The problem consist of two parts:

1. How plugin determines name of branch. If you have a look to your log (at 4th line) - you'll see that it was executed command 'git symbolic-ref -q HEAD'. And result of this command was marked as failed.
2. How CI servers get a code from repository. In most cases it not just a clone, but also a checkout to a specific revision (mean. git clone and git checkout) and in result you have a repo in detached head state. That's why command mentioned about was failed.

So in result we have two ways to fix it:

1. Configure your CI server to prevent detached head.
2. Implement alternative way to determine branch name even in detached head state (but I have no idea how to do this)

[rutchkiwi]

Thanks Nikolay!! That makes perfect sense.

In the end I opted to use a simpler approach, just setting the version in the gradle build file like so:

if (project.hasProperty('newVersion')) {
    version = project.newVersion
    logger.lifecycle("setting version to " + project.getVersion())
} else {
    version = '0-SNAPSHOT'
}

and doing the git tagging manually.

[benfortuna]

I think this shouldn't be closed as the issue isn't resolved. I am seeing the same problem trying to use this plugin with travis-ci.

[ari]

To me it looks as though travis just doesn't have git installed. Simple as that. I've wanted for some time now to move to jGit, but haven't yet had a chance to finish that. Take a look at the jgit branch and perhaps you might have time to assist in completing this migration?

[benfortuna]

Ok. As a workaround I just tried to configure travis to install Git before execution but it didn't make any difference. I'll take a look at the JGit branch when I get a chance to see if I can help. Thanks.