How can I convert a \'normal\' Git repository to a bare one?
The main difference seems to be:
in the normal Git repository, you have a .git
Please also consider to use
git clone --mirror path_to_source_repository
From the documentation:
Set up a mirror of the source repository. This implies --bare. Compared to --bare, --mirror not only maps local branches of the source to local branches of the target, it maps all refs (including remote-tracking branches, notes etc.) and sets up a refspec configuration such that all these refs are overwritten by a git remote update in the target repository.