soa.serial allow environment as serial number

3 files changed, 11 insertions, 1 deletions

diff --git a/README.md b/README.md
index 1f00ab8..152dc53 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ Custom [OctoDNS](https://github.com/octodns/octodns) Providers/Sources I wrote f
 OctoDNS only provides a ZoneFile source. This Provider can create a BIND compatible ZoneFile.
 It can NOT be used as a source. Use the builtin OctoDNS ZoneFile source instead.
 
+soa.serial can be used with `env/` keyword to use environment variable as Serialnumber
+
 Example
 
 ```
diff --git a/octodns-custom-providers/provider/zonefile.py b/octodns-custom-providers/provider/zonefile.py
index f03f578..6df04e1 100755
--- a/octodns-custom-providers/provider/zonefile.py
+++ b/octodns-custom-providers/provider/zonefile.py
@@ -6,6 +6,8 @@ import dns.zone
 import dns.rdataclass
 import dns.rdatatype
 
+import os
+
 class RdataParameterException(Exception):
     def __init__(self, msg):
         super().__init__(msg)
@@ -58,6 +60,12 @@ class ZoneFileProvider(BaseProvider):
         self.soa = soa
         self.soa_ttl = soa_ttl
 
+        # OctoDNS does not recursively check dicts for 'env/' keyword
+        # TODO Error handling
+        serial = self.soa['serial']
+        if type(serial) == str and serial.startswith('env/'):
+            self.soa['serial'] = int(os.environ[ serial.split('/',1)[1] ])
+
         super(ZoneFileProvider, self).__init__(id)
 
     def populate(self, zone, target=False, lenient=False):
diff --git a/setup.py b/setup.py
index 261dddc..2292e1a 100755
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@ import setuptools
 
 setup(
     name='octodns-custom-providers',
-    version='0.3.0',
+    version='0.3.1',
     author="Jonas Gunz",
     author_mail="himself@jonasgunz.de",
     description="Custom sources for OctoDNS",