fix issue in qemu backup restore

src/routes/cluster/backup.js

@@ -103,6 +103,7 @@ router.post("/", async (req, res) => {
  * - node: string - vm host node id
  * - type: string - vm type (lxc, qemu)
  * - vmid: number - vm id number
+ * - volid: volid of the backup to be deleted
  * - notes: notes template string
  * responses:
  * - 200: PVE Task Object
@@ -150,7 +151,12 @@ router.post("/notes", async (req, res) => {
 		notes: params.notes
 	};
 	const result = await global.pve.requestPVE(`/nodes/${params.node}/storage/${storage}/content/${params.volid}`, "PUT", { token: true }, body);
-	res.status(result.status).send(result.data.data);
+	if (result.status === 200) {
+		res.status(result.status).send();
+	}
+	else {
+		res.status(result.status).send({ error: result.statusText });
+	}
 });
 
 /**
@@ -204,3 +210,98 @@ router.delete("/", async (req, res) => {
 	const result = await global.pve.requestPVE(`/nodes/${params.node}/storage/${storage}/content/${params.volid}?delay=5`, "DELETE", { token: true });
 	res.status(result.status).send(result.data.data);
 });
+
+/**
+ * POST - restore instance using backup file. Ideally, PBS should be used instead so that individual disk level restore can be done.
+ * request:
+ * - node: string - vm host node id
+ * - type: string - vm type (lxc, qemu)
+ * - vmid: number - vm id number
+ * - volid: volid of the backup to be deleted
+ * responses:
+ * - 200: PVE Task Object
+ * - 401: {auth: false, path: string}
+ * - 500: {error: string}
+ * - 500: PVE Task Object
+ */
+router.post("/restore", async (req, res) => {
+	const params = {
+		node: req.params.node,
+		type: req.params.type,
+		vmid: req.params.vmid,
+		volid: req.body.volid
+	};
+
+	// check auth for specific instance
+	const vmpath = `/nodes/${params.node}/${params.type}/${params.vmid}`;
+	const auth = await checkAuth(req.cookies, res, vmpath);
+	if (!auth) {
+		return;
+	}
+
+	// check if the specified volid is a backup for the instance
+	// for whatever reason, calling /nodes/node/storage/content/volid does not return the vmid number whereas /nodes/storage/content?... does
+	const storage = global.config.backups.storage;
+	const backups = await global.pve.requestPVE(`/nodes/${params.node}/storage/${storage}/content?content=backup&vmid=${params.vmid}`, "GET", { token: true });
+	if (backups.status !== 200) {
+		res.status(backups.status).send({ error: backups.statusText });
+		return;
+	}
+	let found = false;
+	for (const volume of backups.data.data) {
+		if (volume.subtype === params.type && String(volume.vmid) === params.vmid && volume.content === "backup" && volume.volid === params.volid) {
+			found = true;
+		}
+	}
+	if (!found) {
+		res.status(500).send({ error: `Did not find backup volume ${params.volid} for ${params.node}.${params.vmid}` });
+		return;
+	}
+
+	// container restore
+	// need to use "advanced" mode to specify the storage used for each disk, so we also need to read the container's config
+	// for whatever reason, this will wipe disks that are not included in the backup !!!
+	if (params.type === "lxc") {
+		const body = {
+			vmid: params.vmid,
+			force: 1,
+			ostemplate: params.volid,
+			restore: 1
+		};
+
+		const instance = await global.pve.getInstance(params.node, params.vmid);
+		for (const v in instance.volumes) {
+			const volume = instance.volumes[v];
+			if (volume.type === "mp") {
+				body[v] = `${volume.storage}:${volume.size / 1024 ** 3},mp=${volume.mp},backup=1`;
+			}
+			else if (volume.type === "rootfs") {
+				body[v] = `${volume.storage}:${volume.size / 1024 ** 3}`;
+			}
+		}
+
+		const result = await global.pve.requestPVE(`/nodes/${params.node}/${params.type}/`, "POST", { token: true }, body);
+		console.log(result);
+		if (result.status === 200) {
+			res.status(result.status).send();
+		}
+		else {
+			res.status(result.status).send({ error: result.statusText });
+		}
+	}
+	// VM restore, unlike the container restore, this should not affect disks which are not in the backup
+	else if (params.type === "qemu") { // vm restore
+		const body = {
+			vmid: params.vmid,
+			force: 1,
+			archive: params.volid
+		};
+		const result = await global.pve.requestPVE(`/nodes/${params.node}/${params.type}/`, "POST", { token: true }, body);
+		if (result.status === 200) {
+			res.status(result.status).send();
+		}
+		else {
+			res.status(result.status).send({ error: result.statusText });
+		}
+	}
+});