Description of problem:

start building the kernel (rpmbuild -ba --target ... kernel-2.6.spec)
the %pre stage moves the old build to deleteme and starts the remove in background. 
If you break this process, the folder deleteme and deleteme2 will still
exists and the build process stops.
There's no check, if the deleteme and deleteme2 folder exists.

# We already have a vanilla dir.
  cd kernel-%{kversion}
  if [ -d linux-%{kversion}.%{_target_cpu} ]; then
     mv linux-%{kversion}.%{_target_cpu} deleteme
     rm -rf deleteme &
  fi
  if [ -d xen ]; then
     mv xen deleteme2
     rm -rf deleteme2 &
  fi


Version-Release number of selected component (if applicable):
2.6.16 -1.2128


How reproducible:
Start build process, interrupt it, start again.

Steps to Reproduce:
1.
2.
3.
  
Actual results:
Build process stops

Expected results:
Spec file should remove the deleteme folders and continue working.

Additional info: