Compare 2 nvram dumps for Kille72's Tomato-ARM

compare-nvram.py

#!/opt/bin/python3
"""
compare 2 nvram hash dumps for FreshTomato-ARM
http://freshtomato.org/

before upgrading
        nvram show > nvram.old
upgrade to new build
        nvram show > nvram.new
then
        ./compare-nvram.py nvram.old nvram.new

OR

nvram show > nvram.new && ./compare-nvram.py nvram.old  nvram.new

"""

import sys
import re
import subprocess

file1_NAME = sys.argv[1]
file2_NAME = sys.argv[2]

d1 = {}
d2 = {}


def process_file(filename, dict):
    linenum = 0
    lastkey = None
    with open(filename) as f:
        for line in f:
            line = line.strip()
            linenum = linenum + 1
            match = re.search('^([a-zA-Z0-9./_]+)=(.+)', line)
            if match:
                (key, val) = match.group(1), match.group(2)
                dict[str(key)] = val
                lastkey = str(key)
                # print( str(linenum) + ": " + str(key) + " " + val + "--" + lastkey)

            # some SSH keys might have = in them
            elif line.endswith("=") and len(line) < 40:
                line = line.rstrip("=")
                dict[line] = None
                lastkey = str(line)
                # print(str(linenum) + ": " + line  +": EMPTY")
            elif len(line) < 1:
                # print(str(linenum) + ": BLANKLINE")
                dict[lastkey] = str(dict.get(lastkey)) + "\n" + line
            else:
                dict[lastkey] = str(dict.get(lastkey)) + "\n" + line
                # print(str(linenum) + line + ": PREVIOUS " + str(lastkey))
    return

process_file(file1_NAME, d1)
process_file(file2_NAME, d2)

f1keysSet = set(d1.keys())
f2keysSet = set(d2.keys())

extraKeys1 = f1keysSet - f2keysSet
print("Keys only in f1: {}".format(extraKeys1))

extraKeys2 = f2keysSet - f1keysSet
print("\n Keys only in f2: {}\n".format(extraKeys2))

ignoredKeys = {"sshd_dsskey", "sshd_ecdsakey", "sshd_hostkey", "adblock_blacklist",
               "tinc_hosts", "tinc_private_rsa", "tinc_private_ed25519",
               "wan_ipaddr", "os_date", "http_id", "ddnsx0_cache", "ddnsx1_cache", "sch_c1_last", "wl0.1_hwaddr",
               "wan_ppp_redialpid", "wan_pppd_pid"}

commonKeys = f1keysSet & f2keysSet

for k in sorted(commonKeys):
    if k in ignoredKeys:
        print("IGNORING {} ".format(k))
        next
    elif d1[k] == d2[k]:
        # print (" same {}".format(k) )
        next
    elif k in f2keysSet:
        print("DIFF var-> f1::f2 {} -> {} :: {}".format(k, d1[k], d2[k]))
    else:
        print("missing key {}".format(k))