whichBoot

#!/usr/bin/env python3
#
# whichBoot: Is it UEFI or BIOS?
#
import sys
import os
import argparse
import subprocess

from alogging import ALogger
lg = ALogger()

__metadata__ = {
    "title"        : "whichBoot.py",
    "rightsHolder" : "Steven J. DeRose",
    "creator"      : "http://viaf.org/viaf/50334488",
    "type"         : "http://purl.org/dc/dcmitype/Software",
    "language"     : "Python 3.7",
    "created"      : "2014-08-09",
    "modified"     : "2020-03-04",
    "publisher"    : "http://github.com/sderose",
    "license"      : "https://creativecommons.org/licenses/by-sa/3.0/"
}
__version__ = __metadata__['modified']

descr = """
=head1 Usage

whichBoot: Report whether the machine was booted via UEFI or BIOS.

See: L<http://askubuntu.com/questions/162564>.

=History=

* 2014-08-09: Written by Steven J. DeRose.

* 2020-03-04: Layout, lint.

=Rights=

Copyright 2020-03-04 by Steven J. DeRose. This work is licensed under a
Creative Commons Attribution-Share-alike 3.0 unported license.
See [http://creativecommons.org/licenses/by-sa/3.0/ for more information].

For the most recent version, see L<http://www.derose.net/steve/utilities/>
or L<http://github.com/sderose>.

=Options=
"""


###############################################################################
# Process options
#
parser = argparse.ArgumentParser(
    description=descr
)

parser.add_argument(
    "-q", action='store_true', dest='quiet',
    help='Suppress most messages.')
parser.add_argument(
    "-verbose", action='count', default=0,
    help='Add more messages (repeatable).')
parser.add_argument(
    '-version', action='version', version='Version of '+__version__,
    help='Display version information, then exit.')

args = parser.parse_args()
lg.setVerbose(args.verbose)


###############################################################################
# Main
#
print("\n******* Checking for UEFI vs. BIOS.")

uefiFinds = 0

x = subprocess.check_output([ "dmesg" ]).split("\n")
gr = []
for i in range(0, len(x)):
    if (x[i].find('EFI v')>=0): gr.append(x[i])
if (len(gr)>0):
    print("dmesg | grep 'EFI v' gets %d lines, says UEFI." % (len(gr)))
    print("\n".join(gr))
    uefiFinds += 1


if (os.path.isdir('/sys/firmware/efi')):
    print("/sys/firmware/efi exists, so UEFI.\n")
    uefiFinds += 1

if (not uefiFinds):
    print("dmesg and /sys/firmware/efi checks failed, which means BIOS.")

sys.exit(0)