It seems as though hockeyapp plugin v 1.06 is completely broken on remote slaves.

Uploading to HockeyApp...
/scratch/jenkins/workspace/myjob does not exist.
at org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:483)
at org.apache.tools.ant.types.FileSet.iterator(FileSet.java:69)
at hockeyapp.HockeyappRecorder.perform(HockeyappRecorder.java:138)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:795)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:767)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:716)
at hudson.model.Run.execute(Run.java:1690)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:246)
Build step 'Upload to HockeyApp' marked build as failure

It looks like this bug was introduced in [1b21917b57](https://github.com/jenkinsci/hockeyapp-plugin/commit/1b21917b57059b5184bb3e538c8b3528cd820b94).

The fix is to use something like hudson.FilePath#copyRecursiveTo() to properly copy the file over the remoting channel.