Ariba fails when using NFS directories for output

[thomcuddihy]

shutil.rmtree calls fail when the root_dir is an NFS volume. This due to how NFS handles files that are opened and then deleted while still open by silly renaming them.

Use ariba run --noclean ... or output to a non-NFS directory (and then move if needed) to circumvent issue.

Fix issue by explicitly closing files. I'll send through a pull request if I have time.

[thomcuddihy]

Or, of course, set --tmp_dir to a non-NFS location too :)

[martinghunt]

What errors do you get? Which files are left open? I just ran ariba test on an NFS file system, with ARIBA_TMPDIR=$PWD and it worked ok.