We have following kind of scenario:

• Artifacts (text files containing SVN revision info) are transferred to matrix project(s), which are executed on Win7 slave nodes that are virtualmachines.

• Project read version info files as system variables and uses variable when executing svn checkout from command line

Problem:
Occasionally (not always) variable is empty -because file is still empty while it is read, when checking file content afterwards from workspace, content is OK. I presume that root cause is file-system buffer etc.

Workaround:
We added step that delays file reading couple of seconds, and problem was gone.

Suggesting:
Add file checksum test to copyartifacts plugin, or some other test that verifies that files really are written to file-system and can be used before plugin finishes its task.

Filing this as a bug, but it might be more improvement idea. Change status how you feel appropriate.