google-walleye: fastboot getvar all 2>&1 | grep ' partition'

google-walleye.fastboot.partitions

~ $ fastboot getvar all 2>&1 | grep ' partition'
(bootloader) partition-type:userdata:ext4
(bootloader) partition-size:userdata: 0xD49BFB000
(bootloader) partition-type:vendor_b:ext4
(bootloader) partition-size:vendor_b: 0x1F400000
(bootloader) partition-type:vendor_a:ext4
(bootloader) partition-size:vendor_a: 0x1F400000
(bootloader) partition-type:system_b:ext4
(bootloader) partition-size:system_b: 0xA0000000
(bootloader) partition-type:system_a:ext4
(bootloader) partition-size:system_a: 0xA0000000
(bootloader) partition-type:boot_b:raw
(bootloader) partition-size:boot_b: 0x2000000
(bootloader) partition-type:boot_a:raw
(bootloader) partition-size:boot_a: 0x2000000