CentOS 7 Anaconda BaseInstallClass - efi_dir name
 

Hello,
I am creating a custom CentOS 7 distribution. I created my own logo, banners, changed the name in anaconda welcome screen, ...
I created new my_distribution.py in squashfs.img in usr/lib64/python2.7/site-packages/pyanaconda/installclasses/my_distribution.py and I set efi_dir = "my_distribution". But now Linux ( Anaconda - grub2-mkconfig) installation fails, because directory /boot/efi/EFI/my_distribution/ does not exist, there is still centos directory under /boot/efi/EFI/.

Where/Who/What/How is the "centos" directory defined in ISO? Has it something to do with the default volume group "centos"? What should I change so directory /boot/efi/EFI/my_distribution/ will there during installation? Thank you.