Add support '--progress' option for 'image create'

openstack-client doesn’t support the upload progress bar.

This patch shows progressbar when create image
if you added '--progress' option like a python-glanceclient.

like this.
[=============================>] 100%
+------------------+---------------------------+
| Field            | Value                     |
+------------------+---------------------------+
| container_format | bare                      |
| created_at       | 2020-09-06T20:44:40Z      |
...

How to use
Add the'--progress' option on the 'openstack image create' command.

Code was written by referring to 'python-glanceclient' project
on stable/ussuri branch

Change-Id: Ic3035b49da10b6555066eee607a14a5b73797c00
task: 40003
story: 2007777

1 files changed, 77 insertions, 0 deletions

diff --git a/openstackclient/tests/unit/common/test_progressbar.py b/openstackclient/tests/unit/common/test_progressbar.py
new file mode 100644
index 00000000..7bc0b6ba
--- /dev/null
+++ b/openstackclient/tests/unit/common/test_progressbar.py
@@ -0,0 +1,77 @@
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+import sys
+
+import six
+
+from openstackclient.common import progressbar
+from openstackclient.tests.unit import utils
+
+
+class TestProgressBarWrapper(utils.TestCase):
+
+    def test_iter_file_display_progress_bar(self):
+        size = 98304
+        file_obj = six.StringIO('X' * size)
+        saved_stdout = sys.stdout
+        try:
+            sys.stdout = output = FakeTTYStdout()
+            file_obj = progressbar.VerboseFileWrapper(file_obj, size)
+            chunksize = 1024
+            chunk = file_obj.read(chunksize)
+            while chunk:
+                chunk = file_obj.read(chunksize)
+            self.assertEqual(
+                '[%s>] 100%%\n' % ('=' * 29),
+                output.getvalue()
+            )
+        finally:
+            sys.stdout = saved_stdout
+
+    def test_iter_file_no_tty(self):
+        size = 98304
+        file_obj = six.StringIO('X' * size)
+        saved_stdout = sys.stdout
+        try:
+            sys.stdout = output = FakeNoTTYStdout()
+            file_obj = progressbar.VerboseFileWrapper(file_obj, size)
+            chunksize = 1024
+            chunk = file_obj.read(chunksize)
+            while chunk:
+                chunk = file_obj.read(chunksize)
+            # If stdout is not a tty progress bar should do nothing.
+            self.assertEqual('', output.getvalue())
+        finally:
+            sys.stdout = saved_stdout
+
+
+class FakeTTYStdout(six.StringIO):
+    """A Fake stdout that try to emulate a TTY device as much as possible."""
+
+    def isatty(self):
+        return True
+
+    def write(self, data):
+        # When a CR (carriage return) is found reset file.
+        if data.startswith('\r'):
+            self.seek(0)
+            data = data[1:]
+        return six.StringIO.write(self, data)
+
+
+class FakeNoTTYStdout(FakeTTYStdout):
+    """A Fake stdout that is not a TTY device."""
+
+    def isatty(self):
+        return False