localhost sabayon-sources # ebuild sabayon-sources-2.6.22.ebuild digest

Invalid ebuild name: /usr/portage/local/overlay/sys-kernel/sabayon-sources/sabayon-sources.2.6.22.ebuild
>>> Creating Manifest for /usr/portage/local/overlay/sys-kernel/sabayon-sources
Traceback (most recent call last):
  File "/usr/sbin/ebuild", line 176, in ?
    debug=debug, tree=mytree)
  File "/usr/lib/portage/pym/portage.py", line 4660, in doebuild
    myportdb=mydbapi)
  File "/usr/lib/portage/pym/portage.py", line 3554, in digestgen
    assumeDistHashesAlways=(
  File "/usr/lib/portage/pym/portage_manifest.py", line 469, in create
    raise portage_exception.PortagePackageException(
portage_exception.PortagePackageException: Invalid package name: 'sys-kernel/sabayon-sources.2.6.22'