From 6c7c9aab6d5dd9fd836e19990bb63d5ef47871c2 Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Mon, 12 Apr 2021 17:42:23 +0200
Subject: [PATCH 058/108] qemuBlockJobProcessEventCompletedPull: Add
 backingStore terminators if base is NULL

When doing a blockpull with NULL base the full contents of the disk are
pulled into the topmost image which then becomes fully self-contained.

qemuBlockJobProcessEventCompletedPull doesn't install the backing chain
terminators though, although it's guaranteed that there will be no
backing chain behind disk->src.

Add the terminators for completness and for disabling backing chain
detection on further boots.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit b4d020790642fa4d7b8a6783b81d5d9d73cbe3d9)
---
 src/qemu/qemu_blockjob.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
index 049afdd71a..ea82ce95eb 100644
--- a/src/qemu/qemu_blockjob.c
+++ b/src/qemu/qemu_blockjob.c
@@ -958,6 +958,7 @@ qemuBlockJobProcessEventCompletedPull(virQEMUDriverPtr driver,
                                       qemuBlockJobDataPtr job,
                                       qemuDomainAsyncJob asyncJob)
 {
+    virStorageSource *base = NULL;
     virStorageSourcePtr baseparent = NULL;
     virDomainDiskDefPtr cfgdisk = NULL;
     virStorageSourcePtr cfgbase = NULL;
@@ -979,8 +980,11 @@ qemuBlockJobProcessEventCompletedPull(virQEMUDriverPtr driver,
         return;
 
     if (job->data.pull.base) {
+        base = job->data.pull.base;
+
         if (cfgdisk)
             cfgbase = cfgdisk->src->backingStore;
+
         for (n = job->disk->src->backingStore; n && n != job->data.pull.base; n = n->backingStore) {
             /* find the image on top of 'base' */
 
@@ -991,10 +995,17 @@ qemuBlockJobProcessEventCompletedPull(virQEMUDriverPtr driver,
 
             baseparent = n;
         }
+    } else {
+        /* create terminators for the chain; since we are pulling everything
+         * into the top image the chain is automatically considered terminated */
+        base = virStorageSourceNew();
+
+        if (cfgdisk)
+            cfgbase = virStorageSourceNew();
     }
 
     tmp = job->disk->src->backingStore;
-    job->disk->src->backingStore = job->data.pull.base;
+    job->disk->src->backingStore = base;
     if (baseparent)
         baseparent->backingStore = NULL;
     qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob, tmp);
-- 
2.33.0