[PATCH 3/7] qemuSnapshotPrepareDiskExternal: Reject creation of block devices sooner

[Peter Krempa <pkrempa@xxxxxxxxxx>]

In case when the snapshot target is of VIR_STORAGE_TYPE_BLOCK type and
doesn't exist libvirt won't be able to create it. Reject such a config
sooner.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_snapshot.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c
index 81085bf4bd..f06d0ada38 100644
--- a/src/qemu/qemu_snapshot.c
+++ b/src/qemu/qemu_snapshot.c
@@ -589,6 +589,13 @@ qemuSnapshotPrepareDiskExternal(virDomainObj *vm,
                                      _("missing existing file for disk %s: %s"),
                                      snapdisk->name, snapdisk->src->path);
                 return -1;
+            } else {
+                if (snapdisk->src->type == VIR_STORAGE_TYPE_BLOCK) {
+                    virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+                                   _("block device snapshot target '%s' doesn't exist"),
+                                   snapdisk->src->path);
+                    return -1;
+                }
             }
         } else {
             if (!S_ISBLK(st.st_mode) && st.st_size && !reuse) {
-- 
2.31.1