Since 2011 Ubuntu has intentionally broken support for guestmount[1] by
default and requires sysadmin intervention to re-enable support.  This
in turn exposed that in our tests if guestmount is available but fails
we do not fall back to trying to use sudo.  Restructure our code to try
sudo if guestmount fails rather than only when it is not in our path.
Further, only note that we are using fuse on success of the call.

[1]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725

Cc: Heinrich Schuchardt <xypron.g...@gmx.de>
Cc: Simon Glass <s...@chromium.org>
Cc: Stephen Warren <swar...@nvidia.com>
Signed-off-by: Tom Rini <tr...@konsulko.com>
---
This, I suspect, will also fix the cases where in CI we attempt to run
the FS tests but do not as guestmount fails.  I'm not going to remove
guestmount from the Docker containers as it's a useful reference for
"what is required for a minimal environment for U-Boot builds" and
perhaps we will switch to Debian instead at some point.
---
 test/py/tests/test_fs/conftest.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/test/py/tests/test_fs/conftest.py 
b/test/py/tests/test_fs/conftest.py
index ee82169c2a37..d8ce1876ffca 100644
--- a/test/py/tests/test_fs/conftest.py
+++ b/test/py/tests/test_fs/conftest.py
@@ -206,10 +206,11 @@ def mount_fs(fs_type, device, mount_point):
     fuse_mounted = False
     try:
         if tool_is_in_path('guestmount'):
-            fuse_mounted = True
             check_call('guestmount -a %s -m /dev/sda %s'
                 % (device, mount_point), shell=True)
-        else:
+            fuse_mounted = True
+    except CalledProcessError:
+        try:
             mount_opt = 'loop,rw'
             if re.match('fat', fs_type):
                 mount_opt += ',umask=0000'
@@ -219,8 +220,8 @@ def mount_fs(fs_type, device, mount_point):
 
             # may not be effective for some file systems
             check_call('sudo chmod a+rw %s' % mount_point, shell=True)
-    except CalledProcessError:
-        raise
+        except CalledProcessError:
+            raise
 
 def umount_fs(mount_point):
     """Unmount a volume.
-- 
2.17.1

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