UEFI: How to Detect EFI Partition by GUID?

To detect an EFI partition using its GUID, you can use a variety of methods depending on your operating system and programming language. Here, we'll provide examples in Bash, PowerShell, and Python.

Bash (Linux)

You can use the blkid command in Bash to find partitions and their unique GUIDs. The following command will display all partitions, including the EFI system partition, and their GUIDs:

sudo blkid | grep -E 'EFI|boot'

If you want to find the GUID of a specific EFI partition, you can use the -o value option with the partition's device path:

sudo blkid -o value -s UUID /dev/sda1

Replace /dev/sda1 with the device path of your EFI partition.

PowerShell (Windows)

In PowerShell, you can use the Get-Partition cmdlet to find partitions and their properties, including the GUID. The following command will display all partitions, including the EFI system partition, and their GUIDs:

Get-Partition | Where-Object {$_.DriveLetter -eq '' -and $_.Label -eq 'EFI'} | Format-Table DeviceName,GUID

If you want to find the GUID of a specific EFI partition, you can use the -Filter parameter with the partition's label:

(Get-Partition -Filter "Label -eq 'EFI'" | Select-Object -ExpandProperty DeviceName).DeviceID

Python

In Python, you can use the partman library to access partition information, including the GUID. First, install the library using pip:

pip install partman

Then, you can use the following code to find the GUID of an EFI partition:

import partman

def get_efi_partition_guid():
    partitions = partman.partman.get_partitions()
    for partition in partitions:
        if partition.fstype == 'efi':
            return partition.uuid

print(get_efi_partition_guid())

Replace the print statement with your desired output handling.

References

• blkid
• Get-Partition
• partman