Cleanup & Reorg startup scripts (#691)

* Cleanup & Reorg startup scripts

startup_scripts/040_custom_links.py

@@ -0,0 +1,33 @@
+import sys
+
+from django.contrib.contenttypes.models import ContentType
+from extras.models import CustomLink
+from startup_script_utils import load_yaml
+
+custom_links = load_yaml("/opt/netbox/initializers/custom_links.yml")
+
+if custom_links is None:
+    sys.exit()
+
+
+def get_content_type_id(content_type):
+    try:
+        return ContentType.objects.get(model=content_type).id
+    except ContentType.DoesNotExist:
+        pass
+
+
+for link in custom_links:
+    content_type = link.pop("content_type")
+    link["content_type_id"] = get_content_type_id(content_type)
+    if link["content_type_id"] is None:
+        print(
+            "⚠️ Unable to create Custom Link '{0}': The content_type '{1}' is unknown".format(
+                link.get("name"), content_type
+            )
+        )
+        continue
+
+    custom_link, created = CustomLink.objects.get_or_create(**link)
+    if created:
+        print("🔗 Created Custom Link '{0}'".format(custom_link.name))