2 files changed, 66 insertions, 0 deletions
diff --git a/pkgs/increment-zone-serials/default.nix b/pkgs/increment-zone-serials/default.nix
new file mode 100644
index 0000000..f2d6f02
--- /dev/null
+++ b/pkgs/increment-zone-serials/default.nix
@@ -0,0 +1,18 @@
+{
+  python3,
+  stdenv,
+}:
+stdenv.mkDerivation {
+  pname = "increment-zone-serials";
+  version = "1.0.0";
+
+  propagatedBuildInputs = [
+    (python3.withPackages (py: []))
+  ];
+
+  dontUnpack = true;
+
+  installPhase = ''
+    install -Dm755 ${./increment-zone-serials.py} $out/bin/increment-zone-serials
+  '';
+}
diff --git a/pkgs/increment-zone-serials/increment-zone-serials.py b/pkgs/increment-zone-serials/increment-zone-serials.py
new file mode 100755
index 0000000..394075a
--- /dev/null
+++ b/pkgs/increment-zone-serials/increment-zone-serials.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+import datetime, json, os.path, sys
+
+root_dir = sys.argv[1]
+
+serial_num = lambda n: f'{today}{n:02}'
+today_str  = datetime.datetime.now(datetime.UTC).date().strftime('%Y%m%d')
+today      = int(today_str)
+
+def update_serial(*, zone_class, name, expected, serial):
+    old_serial_int = serial
+    new_serial = serial_num(0)
+
+    if old_serial_int is not None:
+        old_serial = str(old_serial_int)
+        if len(old_serial) > len(new_serial):
+            new_serial = None
+        elif len(old_serial) == len(new_serial):
+            old_day = int(old_serial[:len(today_str)]) 
+            if old_day >= today:
+                new_serial = None
+
+        if new_serial is None:
+            new_serial = str(old_serial_int + 1)
+
+    path = os.path.join(root_dir, zone_class, name, 'serial.nix')
+    with open(path, 'w') as serial_file:
+        print(f'''\
+{{
+  config = {{
+    soa.serial = {new_serial};
+    nullSerialHash = "{expected}";
+  }};
+}}
+''', file=serial_file)
+
+    return path
+
+paths = []
+
+for zone_class, zones in json.load(sys.stdin).items():
+    for zone in zones.values():
+        paths.append(update_serial(**zone, zone_class=zone_class))
+
+# Se imprime al final para evitar estados intermedios si algo tira excepción
+for path in paths:
+    print(path)