Function setup_composefs_bls_boot 

pub(crate) fn setup_composefs_bls_boot(
    setup_type: BootSetupType<'_>,
    repo: Repository<Sha512HashValue>,
    id: &Sha512HashValue,
    entry: &BootEntry<Sha512HashValue>,
    mounted_erofs: &Dir,
) -> Result<String>

Sets up and writes BLS entries and binaries (VMLinuz + Initrd) to disk

Returns

Returns the SHA256Sum of VMLinuz + Initrd combo. Error if any