azure: Accept variation in error msg from mount for ntfs volumes

If Azure detects an ntfs filesystem type during mount attempt, it should
still report the resource device as reformattable. There are slight
differences in error message format on RedHat and SuSE. This patch
simplifies the expected error match to work on both distributions.

LP: #1799338

2 files changed, 15 insertions, 16 deletions

diff --git a/cloudinit/sources/DataSourceAzure.py b/cloudinit/sources/DataSourceAzure.py
index 5ec6096f..6e1797ea 100644
--- a/cloudinit/sources/DataSourceAzure.py
+++ b/cloudinit/sources/DataSourceAzure.py
@@ -725,7 +725,7 @@ def can_dev_be_reformatted(devpath, preserve_ntfs):
         file_count = util.mount_cb(cand_path, count_files, mtype="ntfs",
                                    update_env_for_mount={'LANG': 'C'})
     except util.MountFailedError as e:
-        if "mount: unknown filesystem type 'ntfs'" in str(e):
+        if "unknown filesystem type 'ntfs'" in str(e):
             return True, (bmsg + ' but this system cannot mount NTFS,'
                           ' assuming there are no important files.'
                           ' Formatting allowed.')
diff --git a/tests/unittests/test_datasource/test_azure.py b/tests/unittests/test_datasource/test_azure.py
index 1dc69adb..8ad4368c 100644
--- a/tests/unittests/test_datasource/test_azure.py
+++ b/tests/unittests/test_datasource/test_azure.py
@@ -1511,21 +1511,20 @@ class TestCanDevBeReformatted(CiTestCase):
                     '/dev/sda1': {'num': 1, 'fs': 'ntfs', 'files': []}
                 }}})
 
-        err = ("Unexpected error while running command.\n",
-               "Command: ['mount', '-o', 'ro,sync', '-t', 'auto', ",
-               "'/dev/sda1', '/fake-tmp/dir']\n"
-               "Exit code: 32\n"
-               "Reason: -\n"
-               "Stdout: -\n"
-               "Stderr: mount: unknown filesystem type 'ntfs'")
-        self.m_mount_cb.side_effect = MountFailedError(
-            'Failed mounting %s to %s due to: %s' %
-            ('/dev/sda', '/fake-tmp/dir', err))
-
-        value, msg = dsaz.can_dev_be_reformatted('/dev/sda',
-                                                 preserve_ntfs=False)
-        self.assertTrue(value)
-        self.assertIn('cannot mount NTFS, assuming', msg)
+        error_msgs = [
+            "Stderr: mount: unknown filesystem type 'ntfs'",  # RHEL
+            "Stderr: mount: /dev/sdb1: unknown filesystem type 'ntfs'"  # SLES
+        ]
+
+        for err_msg in error_msgs:
+            self.m_mount_cb.side_effect = MountFailedError(
+                "Failed mounting %s to %s due to: \nUnexpected.\n%s" %
+                ('/dev/sda', '/fake-tmp/dir', err_msg))
+
+            value, msg = dsaz.can_dev_be_reformatted('/dev/sda',
+                                                     preserve_ntfs=False)
+            self.assertTrue(value)
+            self.assertIn('cannot mount NTFS, assuming', msg)
 
     def test_never_destroy_ntfs_config_false(self):
         """Normally formattable situation with never_destroy_ntfs set."""