I have a slave job with a file:

$WORKSPACE/slave/.buildinfo

I attempt to copy it to a directory on the master and got the following stacktrace:

00:00:47.432 [copy-to-slave] Copying 'html/*,/html/*', excluding nothing, from 'file:/mnt/jenkins-workspace/workspace/mw-tools-releng-tox-doc-publish/' on 'hudson.slaves.DumbSlave@6c2e5320' to 'file:/srv/org/wikimedia/doc/mw-tools-releng' on the master.
00:00:47.779 ERROR: Publisher com.michelin.cio.hudson.plugins.copytoslave.CopyToMasterNotifier aborted due to exception
00:00:47.780 hudson.util.IOException2: Failed to extract /mnt/jenkins-workspace/workspace/mw-tools-releng-tox-doc-publish/html/*,/html/*
00:00:47.780 at hudson.FilePath.readFromTar(FilePath.java:2066)
00:00:47.780 at hudson.FilePath.copyRecursiveTo(FilePath.java:1978)
00:00:47.780 at hudson.FilePath.copyRecursiveTo(FilePath.java:1889)
00:00:47.780 at com.michelin.cio.hudson.plugins.copytoslave.CopyToMasterNotifier.perform(CopyToMasterNotifier.java:95)
00:00:47.780 at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:45)
00:00:47.781 at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
00:00:47.781 at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:757)
00:00:47.781 at hudson.model.Build$BuildExecution.post2(Build.java:183)
00:00:47.781 at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:706)
00:00:47.781 at hudson.model.Run.execute(Run.java:1690)
00:00:47.781 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
00:00:47.782 at hudson.model.ResourceController.execute(ResourceController.java:88)
00:00:47.782 at hudson.model.Executor.run(Executor.java:246)
00:00:47.782 Caused by: java.io.FileNotFoundException: /srv/org/wikimedia/doc/mw-tools-releng/html/.buildinfo (No such file or directory)
00:00:47.782 at java.io.FileOutputStream.open(Native Method)
00:00:47.782 at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
00:00:47.782 at java.io.FileOutputStream.<init>(FileOutputStream.java:160)
00:00:47.783 at hudson.util.IOUtils.copy(IOUtils.java:35)
00:00:47.783 at hudson.FilePath.readFromTar(FilePath.java:2056)
00:00:47.783 ... 12 more
00:00:47.789 Finished: FAILURE