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copied!<p>Note: the <a href="https://stackoverflow.com/users/245777/milkplus">OP milkplus</a>'s comment refers to recent <a href="http://issues.hudson-ci.org/browse/HUDSON-6856" rel="nofollow noreferrer"><strong>Hudson bug 6856</strong></a> (June 2010), which mentions:</p> <blockquote> <p><strong>Git builds with detached head no matter what</strong></p> </blockquote> <p>While it is unclear if that particular issue will be solved (answers suggest it might actually "work as designed"!), it also refers to <a href="http://github.com/abayer/Hudson-GIT-plugin/tree/HUDSON-6856" rel="nofollow noreferrer">this version of hudson Git Plugin</a>, allowing to checkout a local branch.</p> <hr> <p>You are in a <strong><a href="https://stackoverflow.com/questions/999907/git-push-says-everything-up-to-date-even-though-i-have-local-changes/1000009#1000009"><code>DETACHED HEAD</code></a></strong> because, as the git plugin is working right now, it did checkout directly a commit SHA1, and not a branch <code>HEAD</code>.</p> <blockquote> <p>The state you are in while your <code>HEAD</code> is detached is not recorded by any branch (which is natural --- you are not on any branch). What this means is that you can discard your temporary commits and merges by switching back to an existing branch.</p> </blockquote> <p>Your building script could first try to <a href="https://stackoverflow.com/questions/2706797/git-finding-what-branch-a-commit-came-from">find what branch the relevant commit is coming from</a>.</p> <hr> <p>As the OP <a href="https://stackoverflow.com/users/245777/milkplus">milkplus</a> realized by looking at the <a href="http://github.com/hudson/Hudson-GIT-plugin/blob/master/src/main/java/hudson/plugins/git/GitSCM.java" rel="nofollow noreferrer">source code of the Hudson Git Plugin</a>:</p> <pre><code>public void buildEnvVars(AbstractBuild build, java.util.Map<String, String> env) { super.buildEnvVars(build, env); String branch = getSingleBranch(build); if(branch != null){ env.put(GIT_BRANCH, branch); } } </code></pre> <p>An environment variable <code>GIT_BRANCH</code> is set, but it doesn't appear to have any value in the xml build script:</p> <pre><code><property environment="env"/> <echo>GIT_BRANCH = ${env.GIT_BRANCH}</echo> </code></pre> <p>If that is the case, it may be because of <a href="http://issues.hudson-ci.org/browse/HUDSON-7554" rel="nofollow noreferrer">issue 7554</a>:</p> <blockquote> <p><code>GIT_BRANCH</code> not set when multiple branches are selected for build </p> <blockquote> <blockquote> <p>When trying to identify what branch the current build are on, I found that the <code>GIT_BRANCH</code> environment variable is not set when more then a single branch is selected to be built.</p> </blockquote> <p>This isn't really a bug so much as a feature request, I think - the <code>GIT_BRANCH</code> env var is only set if there's a single branch, so as such, it's not relevant if/when there are multiple branches. I'm not sure how we'd format an env var for multiple branches in this context.</p> </blockquote> <p>I thought that <code>GIT_BRANCH</code> shall be set to the branch that is currently building. Like if the build is on master it will contain the master.</p> <p>That would help to for example push to another remote that branch that was built during this build. Or Triggering another Build with the correct branch set to be built.</p> </blockquote> <p>Kind of mirror the <a href="http://evgenyg.wordpress.com/2010/03/27/hudson-git-maven/" rel="nofollow noreferrer">NPE described here</a></p> <p><img src="https://i.stack.imgur.com/TkYCQ.png" alt="alt text"></p> <blockquote> <p>For some reason Git plugin started to pass null value for <code>GIT_BRANCH</code> environment variable.<br> This caused Maven plugin to fail in <code>System.getProperties().putAll(systemProps)</code> call.</p> <p>The solution was to use "<code>master</code>" as default Git branch instead of "<code>**</code>" or empty String.</p> </blockquote>

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