Subject: diskbackend: get a proper size of existing block device while cloning
From: Pavel Hrdina phrdina@redhat.com Tue Oct 3 16:59:13 2017 +0200
Date: Thu Oct 19 09:12:05 2017 +0200:
Git: 6e6f59e7abfd85b2a53554b7d091e553585e85c8

We cannot use os.statvfs() if the clone disk is a block device because
it gets stats about filesystem which in this case is "devtmpfs" mounted
as "/dev".

As a workaround we can seek to the end of the block device to get
the actual size.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1450908

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

diff --git a/virtinst/diskbackend.py b/virtinst/diskbackend.py
index de745f4d..a08a23e5 100644
--- a/virtinst/diskbackend.py
+++ b/virtinst/diskbackend.py
@@ -387,8 +387,11 @@ class CloneStorageCreator(_StorageCreator):
     def is_size_conflict(self):
         ret = False
         msg = None
-        vfs = os.statvfs(os.path.dirname(self._path))
-        avail = vfs[statvfs.F_FRSIZE] * vfs[statvfs.F_BAVAIL]
+        if self.get_dev_type() == "block":
+            avail = _stat_disk(self._path)[1]
+        else:
+            vfs = os.statvfs(os.path.dirname(self._path))
+            avail = vfs[statvfs.F_FRSIZE] * vfs[statvfs.F_BAVAIL]
         need = long(self._size * 1024 * 1024 * 1024)
         if need > avail:
             if self._sparse: