[pve-devel] [PATCH manager] ui: qemu: hardware view: fix hwrng cap check for unprivileged users

[Friedrich Weber]

Currently, as an unprivileged user with role PVEVMUser the GUI breaks
with an error after navigating to a VM's hardware tab. The reason is
that the frontend checks the GUI capabilites via `caps.mapping.hwrng`,
but `caps.mapping` does not actually have a property called `hwrng`.

The reason this does not trigger for more privileged users is that all
expressions involving `caps.mapping.hwrng` are short-circuited if the
user has privilege `VM.Config.Type`, so `caps.mapping.hwrng` is never
evaluated.

Fixes: a47a8afb ("ui: let non-root users configure VirtIO RNG devices")
Signed-off-by: Friedrich Weber <f.weber at proxmox.com>
---

Notes:
    I wasn't actually sure whether `caps` may have such a 2-level structure
    in some cases, but it doesn't seem like it. After applying this patch
    to pve-manager:
    
      % ag 'caps\.[^\[.]+\.'  | wc -l
      0

 www/manager6/qemu/HardwareView.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/www/manager6/qemu/HardwareView.js b/www/manager6/qemu/HardwareView.js
index 4ce9908c..b949264f 100644
--- a/www/manager6/qemu/HardwareView.js
+++ b/www/manager6/qemu/HardwareView.js
@@ -316,8 +316,8 @@ Ext.define('PVE.qemu.HardwareView', {
 	rows.rng0 = {
 	    group: 45,
 	    tdCls: 'pve-itype-icon-die',
-	    editor: caps.vms['VM.Config.HWType'] || caps.mapping.hwrng['Mapping.Use'] ? 'PVE.qemu.RNGEdit' : undefined,
-	    never_delete: !caps.vms['VM.Config.HWType'] && !caps.mapping.hwrng['Mapping.Use'],
+	    editor: caps.vms['VM.Config.HWType'] || caps.mapping['Mapping.Use'] ? 'PVE.qemu.RNGEdit' : undefined,
+	    never_delete: !caps.vms['VM.Config.HWType'] && !caps.mapping['Mapping.Use'],
 	    header: gettext("VirtIO RNG"),
 	};
 	for (let i = 0; i < PVE.Utils.hardware_counts.virtiofs; i++) {
@@ -757,7 +757,7 @@ Ext.define('PVE.qemu.HardwareView', {
 				text: gettext("VirtIO RNG"),
 				itemId: 'addRng',
 				iconCls: 'pve-itype-icon-die',
-				disabled: !caps.vms['VM.Config.HWType'] && !caps.mapping.hwrng['Mapping.Use'],
+				disabled: !caps.vms['VM.Config.HWType'] && !caps.mapping['Mapping.Use'],
 				handler: editorFactory('RNGEdit'),
 			    },
 			    {
-- 
2.39.5