Checking Android's Currently Active Partition Slot

fastboot get active slot   Dan fastboot set active slot

But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I do

stack trace: Error: failed to set active slot: Error: {error:{code:1,cmd:fastboot --set-active=b},stderr: waiting for any device > Get active system slot fastboot getvar current-slot fastboot getvar all Get active system slot

hp omen m 2 slot This command provides information about the active slot from which the device is currently booting user $ fastboot getvar current-slot Dump Reset attack mitigation for firmware-based boot modes such as fastboot being active GrapheneOS enables support for ending secondary user profile