added proxmox power button plugin 0.1

proxmox_power_button/signals.py

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2026 Bryan Joshua Pedini
+"""
+Signal receivers for the proxmox_power_button plugin.
+
+Enforce that a VMID is unique *within its cluster*. This runs on post_clean —
+fired during full_clean() — so it surfaces as a normal validation error in both
+the UI forms and the REST API, covering VM creation, VMID edits, and moving a VM
+to a different cluster.
+
+(The custom fields themselves are provisioned by migrations/0001_initial.py.)
+"""
+from django.core.exceptions import ValidationError
+from django.dispatch import receiver
+
+from netbox.signals import post_clean
+from virtualization.models import VirtualMachine
+
+VMID_FIELD = "vmid"
+
+
+@receiver(post_clean, sender=VirtualMachine)
+def enforce_vmid_unique_per_cluster(sender, instance, **kwargs):
+    data = instance.custom_field_data or {}
+    vmid = data.get(VMID_FIELD)
+    # Nothing to check until both a VMID and a cluster are set.
+    if vmid is None or instance.cluster_id is None:
+        return
+
+    duplicate = (
+        VirtualMachine.objects
+        .filter(cluster_id=instance.cluster_id, custom_field_data__vmid=vmid)
+        .exclude(pk=instance.pk or 0)
+        .first()
+    )
+    if duplicate is not None:
+        raise ValidationError(
+            f"VMID {vmid} is already assigned to VM '{duplicate.name}' in "
+            f"cluster '{instance.cluster}'. VMIDs must be unique within a cluster."
+        )