kernel-conf-check

#!/usr/bin/env python3

import itertools as it, operator as op, functools as ft
import os, sys, re, subprocess

p = lambda fmt,*a,**k: print(fmt.format(*a,**k), flush=True)

def main(args=None):
	import argparse
	parser = argparse.ArgumentParser(
		description='Check if specific linux kernel config'
				' options are set to same value as in provided snippet, reporting mismatches.'
			' "Snippet" in this case is any text file that has any number of'
				' "CONFIG_...=..." or "# CONFIG_... is not set" lines in it,'
				' all of which will be matched against .config or /proc/config.gz or such.')
	parser.add_argument('snippet', help='Config snippet to check stuff against.')
	parser.add_argument('kconfig', nargs='?', default='.config',
		help='Kernel config to check. Default is .config in current dir.'
			' Stuff like /proc/config.gz can be specified, will be decompressed via "bsdcat".')

	opts = parser.parse_args(sys.argv[1:] if args is None else args)

	kconf_re = re.compile(r'^\s*(?P<off>#\s*)?(?P<k>CONFIG_[_\w\d]+)(?:=(?P<v>\S+))?')
	kconf_lines = dict()

	proc = subprocess.Popen(['bsdcat', opts.kconfig], stdout=subprocess.PIPE)
	for line in proc.stdout:
		line = line.decode()
		m = kconf_re.search(line)
		if not m: continue
		kconf_lines[m.group('k')] = m.group('off'), m.group('v'), line

	with open(opts.snippet) as src:
		for line in src:
			m = kconf_re.search(line)
			if not m: continue
			mk, mv, m_off = m.group('k'), m.group('v'), m.group('off')

			if mk not in kconf_lines:
				p('Failed to find option in kconfig: {}\n  snippet: {}', mk, line.strip())
				continue

			kconf_off, kconf_v, kconf_line = kconf_lines[mk]
			if m_off != kconf_off or mv != kconf_v:
				p('Value mismatch:\n  snippet: {}\n  kconfig: {}', line.strip(), kconf_line.strip())
			else: p('Matched: {}', mk)

if __name__ == '__main__': sys.exit(main())