fix: wait for VM power tasks before completing controls

AppImage/lib/vm-control.ts

@@ -0,0 +1,32 @@
+import { fetchApi } from './api-config'
+
+// A successful control POST accepts an asynchronous Proxmox task. In
+// particular, an unchanged "running" status cannot confirm a reboot.
+export async function waitForVmControlTask(vmid: number, action: string, task: string) {
+  if (!task) throw new Error('controlNotConfirmed')
+  const expected = action === 'shutdown' || action === 'stop' ? 'stopped' : 'running'
+  const deadline = Date.now() + 180_000
+  let readFailures = 0
+  while (Date.now() < deadline) {
+    let result: { status?: string; exitstatus?: string; guest_status?: string }
+    try {
+      result = await fetchApi(`/api/vms/${vmid}/control-task/${encodeURIComponent(task)}`, {
+        signal: AbortSignal.timeout(10_000),
+      })
+      readFailures = 0
+    } catch (error) {
+      if (++readFailures >= 3) throw new Error('controlNotConfirmed')
+      await new Promise(resolve => setTimeout(resolve, 1000))
+      continue
+    }
+    if (result?.status === 'stopped') {
+      if (!result.exitstatus) throw new Error('controlNotConfirmed')
+      if (result.exitstatus !== 'OK') throw new Error(result.exitstatus)
+      if (result.guest_status === expected) return result
+    } else if (result?.status !== 'running') {
+      throw new Error('controlNotConfirmed')
+    }
+    await new Promise(resolve => setTimeout(resolve, 1000))
+  }
+  throw new Error('controlNotConfirmed')
+}