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🗂️ simple

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without the tool...programmatically in C, I am not a script-kiddy :-)
Got it! Here's how you can add a new UEFI boot entry programmatically in C. You'll need to interface with the UEFI runtime services to create a new boot entry. Below is a simplified example of how you might achieve this:

First, make sure you have the UEFI headers available. You can usually find these in the EDK II project.

Here's a basic example in C to create a new UEFI boot entry:

c
#include <efi.h>
#include <efilib.h>

// Define the GUID for the new boot entry
#define EFI_BOOT_MANAGER_VARIABLE_GUID \
    { 0x8be4df61, 0x93ca, 0x11d2, { 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c } }

EFI_STATUS
EFIAPI
CreateBootEntry(
    IN EFI_HANDLE ImageHandle,
    IN EFI_SYSTEM_TABLE *SystemTable
) {
    EFI_STATUS Status;
    CHAR16 *Description = L"New Boot Entry";
    CHAR16 *FilePath = L"\\EFI\\ubuntu\\grubx64.efi";
    UINT8 Attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
    UINT32 BootOrder;
    UINT16 BootIndex = 0x0000;
    
    // Initialize the EFI Library
    InitializeLib(ImageHandle, SystemTable);

// Generate BootXXXX variable name
    CHAR16 BootVarName[12];
    UnicodeSPrint(BootVarName, sizeof(BootVarName), L"Boot%04X", BootIndex);

// Create the boot entry
    Status = SystemTable->RuntimeServices->SetVariable(
        BootVarName,
        &EFI_BOOT_MANAGER_VARIABLE_GUID,
        Attributes,
        sizeof(BootIndex),
        &BootIndex
    );

if (EFI_ERROR(Status)) {
        Print(L"Failed to create boot entry: %r\n", Status);
        return Status;
    }

// Update the BootOrder variable
    Status = SystemTable->RuntimeServices->GetVariable(
        L"BootOrder",
        &EFI_GLOBAL_VARIABLE,
        NULL,
        &BootOrder,
        &BootIndex
    );

if (EFI_ERROR(Status)) {
        Print(L"Failed to get BootOrder: %r\n", Status);
        return Status;
    }

BootOrder = BootIndex;
    Status = SystemTable->RuntimeServices->SetVariable(
        L"BootOrder",
        &EFI_GLOBAL_VARIABLE,
        Attributes,
        sizeof(BootOrder),
        &BootOrder
    );

if (EFI_ERROR(Status)) {
        Print(L"Failed to set BootOrder: %r\n", Status);
    }

return Status;
}

EFI_STATUS
EFIAPI
efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {

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