Please refer to:
http://git.or.cz/gitwiki/GitFaq#non-bare
- http://thread.gmane.org/gmane.comp.version-control.git/107758/focus=108007
+ https://lore.kernel.org/git/7vbptlsuyv.fsf@gitster.siamese.dyndns.org/
for more details on the reason why this change is needed and the
transition process that already took place so far.