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Revert "nixos/lib/test-driver: enable EFI variable reads at runtime"

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Jacek Galowicz 2023-05-28 13:05:59 +02:00 • committed by GitHub
parent 90758e4147
commit b4b45ee6d2
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28
nixos/lib/test-driver/test_driver/machine.py
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@ -17,7 +17,6 @@ import tempfile
import threading
import time
from test_driver.efi import EfiVariable
from test_driver.logger import rootlog
CHAR_TO_KEY = {
@ -1035,33 +1034,6 @@ class Machine:
"""
self.send_monitor_command(f"hostfwd_add tcp::{host_port}-:{guest_port}")
def running_under_uefi(self) -> bool:
"""
Returns True if the current environment is running under UEFI, False otherwise.
This is achieved by inspecting by the existence of /sys/firmware/efi.
"""
rc, _ = self.execute("test -d /sys/firmware/efi")
return (rc == 0)
def read_efi_variable_from_sysfs(self, guid: str, variable_name: str) -> EfiVariable | None:
"""
Read an EFI variable located in efivars sysfs if available.
Returns None if the EFI variable does not exist.
Raises an assertion error if we are not running under an UEFI environment.
"""
assert self.running_under_uefi(), "This machine is not detected under an UEFI environment"
rc, raw_attributes_and_value = self.execute(f"base64 /sys/firmware/efi/efivars/{variable_name}-{guid}")
if rc != 0: return None
# The return value is a string which is in reality a disguised bytes, we re-encode it properly
# using raw_unicode_escape keeping all the escapes properly.
# This is not guaranteed to work for all the cases but is good enough for UTF-8/UTF-16 usecases.
attributes_and_value = base64.b64decode(raw_attributes_and_value)
# First 4 bytes are attributes: https://www.kernel.org/doc/html/latest/filesystems/efivarfs.html
attributes = attributes_and_value[:4]
value = attributes_and_value[4:]
return EfiVariable(value=value, attributes=attributes)
def block(self) -> None:
"""Make the machine unreachable by shutting down eth1 (the multicast
interface used to talk to the other VMs). We keep eth0 up so that