Allow trailing "_" in hostname attribute. (#354)

Needed e.g. for domains like "_acme-challenge.example.com"

.docker/web/entrypoint.sh

@@ -7,7 +7,7 @@ python3 -m pipenv install --dev
 
 # Wait for database to be available before running migrations
 until pg_isready -h "$POSTGRES_HOST" -U "$POSTGRES_USER" &> /dev/null; do
-  echo "Waiting for database to be ready ..."
+  echo "Waiting for database to be ready on ${POSTGRES_HOST} ..."
   sleep 5
 done
 

serveradmin.sql

@@ -885,7 +885,7 @@ CREATE TABLE public.server (
     hostname character varying(254) NOT NULL,
     intern_ip inet,
     servertype_id character varying(32) NOT NULL,
-    CONSTRAINT server_hostname_check CHECK (((hostname)::text ~ '\A(\*\.)?([a-z0-9]+(\.|-+))*[a-z0-9]+\Z'::text))
+    CONSTRAINT server_hostname_check CHECK (((hostname)::text ~ '\A(\*\.)?([a-z0-9_]+(\.|-+))*[a-z0-9]+\Z'::text))
 );
 
 

serveradmin/serverdb/migrations/0018_alter_server_hostname.py

@@ -0,0 +1,34 @@
+# Generated by Django 3.2.23 on 2024-01-04 08:23
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('serverdb', '0017_inet_family_choice'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='server',
+            name='hostname',
+            field=models.CharField(max_length=254, unique=True, validators=[django.core.validators.RegexValidator('\\A(\\*\\.)?([a-z0-9_]+(\\.|-+))*[a-z0-9]+\\Z', 'Invalid hostname')]),
+        ),
+        migrations.RunSQL(
+            sql=(
+                "ALTER TABLE server "
+                "DROP CONSTRAINT server_hostname_check, "
+                "ADD CONSTRAINT server_hostname_check "
+                "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9_]+(\.|-+))*[a-z0-9]+\Z'::text);"
+            ),
+            reverse_sql=(
+                "ALTER TABLE server "
+                "DROP CONSTRAINT server_hostname_check, "
+                "ADD CONSTRAINT server_hostname_check "
+                "CHECK (hostname::text ~ '\A(\*\.)?([a-z0-9]+(\.|-+))*[a-z0-9]+\Z'::text);"
+            )
+        ),
+    ]
+

serveradmin/serverdb/models.py

@@ -58,7 +58,7 @@
 
 HOSTNAME_VALIDATORS = [
     RegexValidator(
-        r'\A(\*\.)?([a-z0-9]+(\.|-+))*[a-z0-9]+\Z', 'Invalid hostname'
+        r'\A(\*\.)?([a-z0-9_]+(\.|-+))*[a-z0-9]+\Z', 'Invalid hostname'
     ),
 ]