From 024d14d52968ce123ee4435574ebd3197bd6503b Mon Sep 17 00:00:00 2001
From: Pierre Donias <pierre.donias@gmail.com>
Date: Thu, 1 Jun 2017 15:28:03 +0200
Subject: [PATCH] fix(Xapi#_installPoolPatchAndRequirements): ignore required
 patch if already installed (#564)

---
 src/xapi/mixins/patching.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/xapi/mixins/patching.js b/src/xapi/mixins/patching.js
index 4a9726dd9..82b6876e6 100644
--- a/src/xapi/mixins/patching.js
+++ b/src/xapi/mixins/patching.js
@@ -380,8 +380,12 @@ export default {
 
     if (requirements.length) {
       for (const requirementUuid of requirements) {
-        await this._installPoolPatchAndRequirements(patchesByUuid[requirementUuid], patchesByUuid, host)
-        host = host && this.getObject(host.$id)
+        const requirement = patchesByUuid[requirementUuid]
+
+        if (requirement != null) {
+          await this._installPoolPatchAndRequirements(requirement, patchesByUuid, host)
+          host = host && this.getObject(host.$id)
+        }
       }
     }