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Add compare logic to prevent non required writes

Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
Knut Ahlers 2018-02-05 07:17:16 +01:00
parent 1f2fef39fb
commit b4a7256097
Signed by: luzifer
GPG key ID: DC2729FDD34BE99E

View file

@ -1,7 +1,11 @@
#!/usr/bin/env python3 #!/usr/bin/env python3
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
import difflib
import hashlib
import os import os
import os.path
import sys
# Third-party imports # Third-party imports
import dns.resolver import dns.resolver
@ -9,6 +13,7 @@ import dns.rdatatype
import jinja2 import jinja2
import yaml import yaml
BLOCKSIZE = 65536
DEFAULT_TTL = 3600 DEFAULT_TTL = 3600
@ -18,6 +23,33 @@ def default(d, key, default=None):
return default return default
def diff_files(file1, file2):
fromlines = []
tolines = []
if os.path.isfile(file1):
with open(file1) as ff:
fromlines = ff.readlines()
if os.path.isfile(file2):
with open(file2) as tf:
tolines = tf.readlines()
print(''.join(difflib.unified_diff(
fromlines, tolines, file1, file2)))
def hash_file(filename):
if not os.path.isfile(filename):
return ""
hasher = hashlib.sha1()
with open(filename, 'rb') as afile:
buf = afile.read(BLOCKSIZE)
while len(buf) > 0:
hasher.update(buf)
buf = afile.read(BLOCKSIZE)
return hasher.hexdigest()
def resolve_alias(entry): def resolve_alias(entry):
result = [] result = []
@ -31,6 +63,8 @@ def resolve_alias(entry):
raise Exception( raise Exception(
"Alias {} was not resolvable: No answers!".format(entry['alias'])) "Alias {} was not resolvable: No answers!".format(entry['alias']))
answers.sort()
for rdata in answers: for rdata in answers:
new_entry = entry.copy() new_entry = entry.copy()
del new_entry['alias'] del new_entry['alias']
@ -77,7 +111,9 @@ def write_zone(zone, ttl, soa, nameserver, mailserver, entries):
with open("zones/tmp.{}".format(zone), 'w') as zf: with open("zones/tmp.{}".format(zone), 'w') as zf:
zf.write(zone_content) zf.write(zone_content)
# FIXME (kahlers): Check if contents changed if hash_file("zones/tmp.{}".format(zone)) != hash_file("zones/db.{}".format(zone)):
print("Generated and replaced zone file for {}".format(zone))
diff_files("zones/db.{}".format(zone), "zones/tmp.{}".format(zone))
os.rename("zones/tmp.{}".format(zone), "zones/db.{}".format(zone)) os.rename("zones/tmp.{}".format(zone), "zones/db.{}".format(zone))