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#!/usr/bin/env python3
import argparse
import os
import struct
parser = argparse.ArgumentParser(description='show the title of the first UEFI boot entry')
parser.add_argument("--current", action='store_true', help='show the current boot entry instead')
parser.add_argument("--path", action='store_true', help='show path instead of title')
parser.add_argument("vardir", nargs='?', default='/sys/firmware/efi/efivars',
help='the path to the variable directory (default: /sys/firmware/efi/efivars)')
args = parser.parse_args()
u32_f = '@I'
u16_f = '@H'
device_path_header_f = '@BBH'
def file_read(fd, fmt):
buf = fd.read(struct.calcsize(fmt))
if len(buf) == 0:
return None
return struct.unpack(fmt, buf)
order = []
with open(os.path.join(args.vardir, 'BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c'), 'br') as b:
file_read(b, u32_f)
while True:
r = file_read(b, u16_f)
if r is None:
break
order.append(r[0])
with open(os.path.join(args.vardir, 'BootCurrent-8be4df61-93ca-11d2-aa0d-00e098032b8c'), 'br') as b:
file_read(b, u32_f)
r = file_read(b, u16_f)
current = r[0]
if args.current:
selected = current
else:
selected = order[0]
with open(os.path.join(args.vardir, 'Boot{:04x}-8be4df61-93ca-11d2-aa0d-00e098032b8c'.format(selected)), 'br') as e:
file_read(e, u32_f)
file_read(e, u32_f)
path_len = file_read(e, u16_f)[0]
title_words = []
while True:
b = file_read(e, u16_f)
if b[0] == 0:
break
title_words.append(struct.pack(u16_f, b[0]))
last_path = None
path_read = 0
while path_read < path_len:
dp_header = file_read(e, device_path_header_f)
dp_data = e.read(dp_header[2] - struct.calcsize(device_path_header_f))
path_read += dp_header[2]
if dp_header[0] == 4 and dp_header[1] == 4:
last_path = dp_data
if args.path:
print(last_path.decode('utf-16').rstrip('\0'))
else:
print(b''.join(title_words).decode('utf-16'))
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