There is a pending pull request to the git plugin which provides a new
environment variable, GIT_SHORT_BRANCH_NAME. The semantics of that
proposed environment variable are not quite what you're describing, but you
might review the pull request to see if it is close enough for your use
case. See https://github.com/jenkinsci/git-plugin/pull/347 and
https://github.com/jenkinsci/git-plugin/pull/304 for two different
possibilities.
Mark Waite
On Tue, Dec 29, 2015 at 8:36 PM Michael Giroux <mlgir...@gmail.com> wrote:
> Yes.
>
> The issue I'm describing is a result of using the Git Parameter plugin
> which allows the user to select a branch, + the Git plugin which allows
> configuration of the branch to build and the local branch name, + maven
> release plugin which relies on local branch name for push to remote + Stash
> Webhook to Jenkins with triggers a build of any arbitrary branch.
>
> I will admit that one solution is to create two jobs in Jenkins to allow
> building of any arbitrary branch as triggered by the Stash web hook for
> jenkins, and a second job that is configured to build a branch specified by
> user supplied parameter values.
>
> The problem occurs when when attempting to configure a single jenkins
> build that allows for manual specification of branch via the Git parameter,
> and builds kicked off by the Stash web hook to jenkins.
>
> 1. to allow the jenkins web hook to initiate a build, it is necessary to
> configure the build to build any branch (leaving branch to build as blank).
> 2. to allow a maven release to build, you MUST specify a local branch
> name. Otherwise, the push to stash fails the build does not have a local
> branch name.
> 3. To meet condittion #1, the default value for the Git parameter must be
> "**" so that the branch to build is ANY (** or empty)
>
> So basically, the issue is that if a build is configured to build any
> branch, and also has maven release configured, you need some way to get the
> code checked out to a local branch (additional behaviors) with the same
> name as the branch being built, and there is currently no way to do that.
>
> I tried to put "${GIT_BRANCH/*\//}" into the "checkout to local branch"
> but this did not work. It seems this field does not resolve environment
> variable references using full bash variable reference notation. Perhaps
> this is the solution. Extend the "checkout to local branch" to provide
> full bash resolution of the variable name.
>
>
> On Tuesday, December 29, 2015 at 10:03:25 AM UTC-7, Michael Giroux wrote:
>>
>> Using Jenkins 1.609.3, Git plugin 2.4.0.
>>
>> We have configured most of our jobs to allow jobs to be initiated by the
>> Stash Webhook to Jenkins. To allow developers to manually initiate a build
>> of any branch, the jobs use the Git Parameter to set a BRANCH variable.
>>
>> Using this configuration, the Git Parameter is configured to set "**" as
>> the default branch to build. This allows the Stash Webhook to initiate a
>> build of any branch. In order to allow the job to perform a maven release,
>> we have configured the Git SCM to checkout to local branch "master". This
>> all works well as long as we are not doing a maven release, or when we do a
>> maven release on the master branch. The strategy breaks down if the
>> developer attempts a maven release on another branch when the maven
>> release:prepare goal tries to push pom updates. Note that the maven
>> release plugin uses the current local branch in the push as "git push url
>> localBranch:localBranch" As a result, when the build is for "some_branch"
>> which has been checked out to local branch "master" we get an error on "git
>> push ... master:master" because the remote "master" is not in sync with the
>> local. No surprises here since the local "master" is actually
>> "some_branch".
>>
>> To resolve this, we have deleted the "checkout to local branch"
>> additional action, and added a pre-build step that does the following:'
>> # checkout to a local branch using the remote branch name
>> LOCAL_GIT_BRANCH=${GIT_BRANCH/*\//}
>> git rev-parse --quiet --verify ${LOCAL_GIT_BRANCH} && git branch -D
>> ${LOCAL_GIT_BRANCH}
>> git checkout -b ${LOCAL_GIT_BRANCH} ${GIT_COMMIT}
>>
>> With this in place, the build checks the code out to a local branch with
>> the same name as the remote branch allowing the maven release:prepare goal
>> to push changes to the branch that is being build.
>>
>> NOTE that we have tried to configure the "checkout to local branch" using
>> the property that is configured by the Git ($BRANCH) but that results in
>> local branch names of "origin/master", "origin/some_branch", ... This
>> results in release:prepare doing pushes as "git push ...
>> origin/some_branch:origin/some_branch" which results in a new remote branch
>> named "origin/some_branch" We have seen repos with branches named
>> "origin/master". As a result, the desired branch is not updated, and a new
>> branch is created.
>>
>> QUESTION/SUGGESTION/...
>> It would be nice to have an option in the Git plugin to "checkout to
>> local branch" that derives the local branch name from the remote branch
>> name, without having to add our pre-build step. Thus, if I select
>> "origin/some_branch" from the Git parameter, I could checkout to local
>> branch using the Git Parameter $BRANCH which would resolve to "some_branch"
>> sans the "origin/" prefix.
>>
>> Steps to Reproduce:
>> 1. configure a parameterized job with a git parameter using "BRANCH" as
>> the parameter name
>> 2. configure the Git scm additional behavour to checkout to local branch
>> "$BRANCH"
>> 3. configure job with as a maven release.
>> 4. perform a maven releae, selecting one of the branches from the list of
>> Git Parameter options.
>> 5. observe console output to examine the "git push" commands generated by
>> the release:prepare goal.
>>
>>
>> --
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