feat: add vm power actions

platform/proxmox/client.go

@@ -163,6 +163,36 @@ func (c *Client) GetTaskStatus(ctx context.Context, node string, upid string) (T
 	}, nil
 }
 
+func (c *Client) PowerVM(ctx context.Context, node string, vmid int, action string) (string, error) {
+	response, err := c.Post(ctx, fmt.Sprintf(
+		"/nodes/%s/qemu/%d/status/%s",
+		url.PathEscape(node),
+		vmid,
+		url.PathEscape(action),
+	), nil)
+	if err != nil {
+		return "", err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode >= http.StatusBadRequest {
+		_, _ = io.Copy(io.Discard, response.Body)
+		return "", fmt.Errorf("proxmox returned %s", response.Status)
+	}
+
+	var body struct {
+		Data string `json:"data"`
+	}
+	if err := json.NewDecoder(response.Body).Decode(&body); err != nil {
+		return "", err
+	}
+	if body.Data == "" {
+		return "", fmt.Errorf("proxmox response missing UPID")
+	}
+
+	return body.Data, nil
+}
+
 func (c *Client) Do(ctx context.Context, method string, path string, body []byte) (*http.Response, error) {
 	var lastErr error
 	attempts := c.retries + 1

platform/proxmox/client_test.go

@@ -108,6 +108,28 @@ func TestClientGetsTaskStatus(t *testing.T) {
 	}
 }
 
+func TestClientPowersVM(t *testing.T) {
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Fatalf("method = %s, want POST", r.Method)
+		}
+		if r.URL.Path != "/api2/json/nodes/pve/qemu/100/status/start" {
+			t.Fatalf("path = %q", r.URL.Path)
+		}
+		_, _ = w.Write([]byte(`{"data":"UPID:pve:1"}`))
+	}))
+	defer server.Close()
+
+	client := newTestClient(t, server, fingerprintForServer(server))
+	upid, err := client.PowerVM(context.Background(), "pve", 100, "start")
+	if err != nil {
+		t.Fatalf("PowerVM() error = %v", err)
+	}
+	if upid != "UPID:pve:1" {
+		t.Fatalf("UPID = %q, want UPID:pve:1", upid)
+	}
+}
+
 func TestNewClientRejectsInvalidFingerprint(t *testing.T) {
 	_, err := NewClient(cluster.Cluster{
 		APIEndpoint:    "https://pve.example.test:8006/api2/json",