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Translate old legacy grub scripts into grub.py
Implement ogGrubInstallMbr as install_main_grub() and
ogGrubInstallPartition as install_linux_grub().
Add grub configuration file generator through the classes
GrubConfig and MenuEntry.
Ensure EFI tree structure compatibility with legacy code.
The structure of the created folders in the ESP is non-standard,
efi binaries are usually located in the folder below the EFI/
directory.
Structure used by ogClient:
EFI/
├── grub/
│ └── Boot/
│ ├── BOOTX64.CSV
│ ├── grub.cfg
│ ├── mmx64.efi
│ ├── shimx64.efi
│ ├── BOOTX64.EFI
│ ├── grubx64.efi
│ └── ogloader.efi
...
The function _mangle_efi_folder handles the folder structure after
grub-install to comply with the location expected by ogLive.
install_linux_grub() installs a grub local to each Linux install
to enable chainloading, each grub is located in EFI/Part-xx-yy/ in
UEFI. The local linux BIOS grub in legacy scripts is unreliable,
grub-install reports a failure during the install process.
install_main_grub() installs a global grub in EFI/grub/ to show a
grub menu when the pxe boot fails. The global grub contains entries
to every installed os. No global grub is installed for BIOS
systems, a Boot partition would be required to store the grub
configuration.
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