Fix path to GRUB patch files in GRUB build stage.
Get the GRUB RPMs one more time before installing them.
print output before unmounting
make debuglevel in yum quieter
close the patchfile when done so that the file systems can be mounted
reduce yum debug level even more
lock the cache to prevent concurrent writing and hence corruption
test for the presence of lsof
implement yum cache locking and yum repo fixation
unfuck temporary yum configs
refine lsof output
Fix numerous bugs