[PATCH v8 07/11] iotests: limit line length to 79 chars

[John Snow <jsnow@redhat.com>]

79 is the PEP8 recommendation. This recommendation works well for
reading patch diffs in TUI email clients.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/qemu-iotests/iotests.py | 64 +++++++++++++++++++++++------------
 tests/qemu-iotests/pylintrc   |  6 +++-
 2 files changed, 47 insertions(+), 23 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 3d90fb157d..75fd697d77 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -77,9 +77,11 @@
 def qemu_img(*args):
     '''Run qemu-img and return the exit code'''
     devnull = open('/dev/null', 'r+')
-    exitcode = subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
+    exitcode = subprocess.call(qemu_img_args + list(args),
+                               stdin=devnull, stdout=devnull)
     if exitcode < 0:
-        sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
+        sys.stderr.write('qemu-img received signal %i: %s\n'
+                         % (-exitcode, ' '.join(qemu_img_args + list(args))))
     return exitcode
 
 def ordered_qmp(qmsg, conv_keys=True):
@@ -118,7 +120,8 @@ def qemu_img_verbose(*args):
     '''Run qemu-img without suppressing its output and return the exit code'''
     exitcode = subprocess.call(qemu_img_args + list(args))
     if exitcode < 0:
-        sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
+        sys.stderr.write('qemu-img received signal %i: %s\n'
+                         % (-exitcode, ' '.join(qemu_img_args + list(args))))
     return exitcode
 
 def qemu_img_pipe(*args):
@@ -129,7 +132,8 @@ def qemu_img_pipe(*args):
                             universal_newlines=True)
     exitcode = subp.wait()
     if exitcode < 0:
-        sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
+        sys.stderr.write('qemu-img received signal %i: %s\n'
+                         % (-exitcode, ' '.join(qemu_img_args + list(args))))
     return subp.communicate()[0]
 
 def qemu_img_log(*args):
@@ -159,7 +163,8 @@ def qemu_io(*args):
                             universal_newlines=True)
     exitcode = subp.wait()
     if exitcode < 0:
-        sys.stderr.write('qemu-io received signal %i: %s\n' % (-exitcode, ' '.join(args)))
+        sys.stderr.write('qemu-io received signal %i: %s\n'
+                         % (-exitcode, ' '.join(args)))
     return subp.communicate()[0]
 
 def qemu_io_log(*args):
@@ -281,10 +286,13 @@ def filter_test_dir(msg):
 def filter_win32(msg):
     return win32_re.sub("", msg)
 
-qemu_io_re = re.compile(r"[0-9]* ops; [0-9\/:. sec]* \([0-9\/.inf]* [EPTGMKiBbytes]*\/sec and [0-9\/.inf]* ops\/sec\)")
+qemu_io_re = re.compile(r"[0-9]* ops; [0-9\/:. sec]* "
+                        r"\([0-9\/.inf]* [EPTGMKiBbytes]*\/sec "
+                        r"and [0-9\/.inf]* ops\/sec\)")
 def filter_qemu_io(msg):
     msg = filter_win32(msg)
-    return qemu_io_re.sub("X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)", msg)
+    return qemu_io_re.sub("X ops; XX:XX:XX.X "
+                          "(XXX YYY/sec and XXX ops/sec)", msg)
 
 chown_re = re.compile(r"chown [0-9]+:[0-9]+")
 def filter_chown(msg):
@@ -336,7 +344,9 @@ def filter_img_info(output, filename):
         line = line.replace(filename, 'TEST_IMG') \
                    .replace(imgfmt, 'IMGFMT')
         line = re.sub('iters: [0-9]+', 'iters: XXX', line)
-        line = re.sub('uuid: [-a-f0-9]+', 'uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX', line)
+        line = re.sub('uuid: [-a-f0-9]+',
+                      'uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX',
+                      line)
         line = re.sub('cid: [0-9]+', 'cid: XXXXXXXXXX', line)
         lines.append(line)
     return '\n'.join(lines)
@@ -529,11 +539,13 @@ def pause_drive(self, drive, event=None):
             self.pause_drive(drive, "write_aio")
             return
         self.qmp('human-monitor-command',
-                 command_line='qemu-io %s "break %s bp_%s"' % (drive, event, drive))
+                 command_line='qemu-io %s "break %s bp_%s"'
+                 % (drive, event, drive))
 
     def resume_drive(self, drive):
         self.qmp('human-monitor-command',
-                 command_line='qemu-io %s "remove_break bp_%s"' % (drive, drive))
+                 command_line='qemu-io %s "remove_break bp_%s"'
+                 % (drive, drive))
 
     def hmp_qemu_io(self, drive, cmd):
         '''Write to a given drive using an HMP command'''
@@ -793,16 +805,18 @@ def dictpath(self, d, path):
                 idx = int(idx)
 
             if not isinstance(d, dict) or component not in d:
-                self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
+                self.fail(f'failed path traversal for "{path}" in "{d}"')
             d = d[component]
 
             if m:
                 if not isinstance(d, list):
-                    self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
+                    self.fail(f'path component "{component}" in "{path}" '
+                              f'is not a list in "{d}"')
                 try:
                     d = d[idx]
                 except IndexError:
-                    self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
+                    self.fail(f'invalid index "{idx}" in path "{path}" '
+                              f'in "{d}"')
         return d
 
     def assert_qmp_absent(self, d, path):
@@ -853,10 +867,13 @@ def assert_json_filename_equal(self, json_filename, reference):
         '''Asserts that the given filename is a json: filename and that its
            content is equal to the given reference object'''
         self.assertEqual(json_filename[:5], 'json:')
-        self.assertEqual(self.vm.flatten_qmp_object(json.loads(json_filename[5:])),
-                         self.vm.flatten_qmp_object(reference))
+        self.assertEqual(
+            self.vm.flatten_qmp_object(json.loads(json_filename[5:])),
+            self.vm.flatten_qmp_object(reference)
+        )
 
-    def cancel_and_wait(self, drive='drive0', force=False, resume=False, wait=60.0):
+    def cancel_and_wait(self, drive='drive0', force=False,
+                        resume=False, wait=60.0):
         '''Cancel a block job and wait for it to finish, returning the event'''
         result = self.vm.qmp('block-job-cancel', device=drive, force=force)
         self.assert_qmp(result, 'return', {})
@@ -880,8 +897,8 @@ def cancel_and_wait(self, drive='drive0', force=False, resume=False, wait=60.0):
         self.assert_no_active_block_jobs()
         return result
 
-    def wait_until_completed(self, drive='drive0', check_offset=True, wait=60.0,
-                             error=None):
+    def wait_until_completed(self, drive='drive0', check_offset=True,
+                             wait=60.0, error=None):
         '''Wait for a block job to finish, returning the event'''
         while True:
             for event in self.vm.get_qmp_events(wait=wait):
@@ -1020,8 +1037,11 @@ def verify_quorum():
         notrun('quorum support missing')
 
 def qemu_pipe(*args):
-    '''Run qemu with an option to print something and exit (e.g. a help option),
-    and return its output'''
+    """
+    Run qemu with an option to print something and exit (e.g. a help option).
+
+    :return: QEMU's stdout output.
+    """
     args = [qemu_prog] + qemu_opts + list(args)
     subp = subprocess.Popen(args, stdout=subprocess.PIPE,
                             stderr=subprocess.STDOUT,
@@ -1059,8 +1079,8 @@ def func_wrapper(test_case: QMPTestCase, *args, **kwargs):
 
             usf_list = list(set(fmts) - set(supported_formats(read_only)))
             if usf_list:
-                test_case.case_skip('{}: formats {} are not whitelisted'.format(
-                    test_case, usf_list))
+                msg = f'{test_case}: formats {usf_list} are not whitelisted'
+                test_case.case_skip(msg)
                 return None
             else:
                 return func(test_case, *args, **kwargs)
diff --git a/tests/qemu-iotests/pylintrc b/tests/qemu-iotests/pylintrc
index 8720b6a0de..8d02f00607 100644
--- a/tests/qemu-iotests/pylintrc
+++ b/tests/qemu-iotests/pylintrc
@@ -19,4 +19,8 @@ disable=invalid-name,
         too-many-public-methods,
         # These are temporary, and should be removed:
         missing-docstring,
-        line-too-long,
+
+[FORMAT]
+
+# Maximum number of characters on a single line.
+max-line-length=79
-- 
2.21.1