[PATCH 2/3] conf: backup: Fix logic for generating default backup filenames

[Peter Krempa <pkrempa@xxxxxxxxxx>]

If the 'disk->store' property is already allocated which happens e.g.
when the disk is described by the backup XML but the optional filename
is not filled in 'virDomainBackupDefAssignStore' would not fill in the
default location.

Fix the logic to do it also if a 'virStorageSource' categorizes as
empty.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/conf/backup_conf.c                       | 7 +++++--
 tests/domainbackupxml2xmlin/backup-push.xml  | 1 +
 tests/domainbackupxml2xmlout/backup-push.xml | 3 +++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/conf/backup_conf.c b/src/conf/backup_conf.c
index 013c08cd6e..e151c29738 100644
--- a/src/conf/backup_conf.c
+++ b/src/conf/backup_conf.c
@@ -424,7 +424,8 @@ virDomainBackupDefAssignStore(virDomainBackupDiskDef *disk,
         }
     }

-    if (!disk->store) {
+    if (!disk->store ||
+        virStorageSourceIsEmpty(disk->store)) {
         if (virStorageSourceGetActualType(src) != VIR_STORAGE_TYPE_FILE) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("refusing to generate file name for disk '%1$s'"),
@@ -432,7 +433,9 @@ virDomainBackupDefAssignStore(virDomainBackupDiskDef *disk,
             return -1;
         }

-        disk->store = virStorageSourceNew();
+        if (!disk->store)
+            disk->store = virStorageSourceNew();
+
         disk->store->type = VIR_STORAGE_TYPE_FILE;
         disk->store->path = g_strdup_printf("%s.%s", src->path, suffix);
     }
diff --git a/tests/domainbackupxml2xmlin/backup-push.xml b/tests/domainbackupxml2xmlin/backup-push.xml
index 0bfec9b270..a95833d407 100644
--- a/tests/domainbackupxml2xmlin/backup-push.xml
+++ b/tests/domainbackupxml2xmlin/backup-push.xml
@@ -5,6 +5,7 @@
       <driver type='raw'/>
       <target file='/path/to/file'/>
     </disk>
+    <disk name='vdb' type='file' backupmode='full'/>
     <disk name='hda' backup='no'/>
   </disks>
 </domainbackup>
diff --git a/tests/domainbackupxml2xmlout/backup-push.xml b/tests/domainbackupxml2xmlout/backup-push.xml
index 317dcf6e47..fff7db716b 100644
--- a/tests/domainbackupxml2xmlout/backup-push.xml
+++ b/tests/domainbackupxml2xmlout/backup-push.xml
@@ -5,6 +5,9 @@
       <driver type='raw'/>
       <target file='/path/to/file'/>
     </disk>
+    <disk name='vdb' backup='yes' type='file' backupmode='full'>
+      <target file='/fake/vdb.qcow2.SUFFIX'/>
+    </disk>
     <disk name='hda' backup='no'/>
     <disk name='vdextradisk' backup='no'/>
   </disks>
-- 
2.40.1