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-rwxr-xr-xtests/qemu-iotests/08531
-rw-r--r--tests/qemu-iotests/085.out33
-rwxr-xr-xtests/qemu-iotests/12918
-rwxr-xr-xtests/qemu-iotests/31016
-rwxr-xr-xtests/qemu-iotests/check11
-rw-r--r--tests/qemu-iotests/iotests.py7
-rwxr-xr-xtests/qemu-iotests/tests/image-fleecing4
7 files changed, 89 insertions, 31 deletions
diff --git a/tests/qemu-iotests/085 b/tests/qemu-iotests/085
index d557522943..de74262a26 100755
--- a/tests/qemu-iotests/085
+++ b/tests/qemu-iotests/085
@@ -103,11 +103,18 @@ do_blockdev_add()
 }
 
 # ${1}: unique identifier for the snapshot filename
-add_snapshot_image()
+create_snapshot_image()
 {
     base_image="${TEST_DIR}/$((${1}-1))-${snapshot_virt0}"
     snapshot_file="${TEST_DIR}/${1}-${snapshot_virt0}"
     TEST_IMG=$snapshot_file _make_test_img -u -b "${base_image}" -F $IMGFMT "$size"
+}
+
+# ${1}: unique identifier for the snapshot filename
+add_snapshot_image()
+{
+    snapshot_file="${TEST_DIR}/${1}-${snapshot_virt0}"
+    create_snapshot_image "$1"
     do_blockdev_add "$1" "'backing': null, " "${snapshot_file}"
 }
 
@@ -231,6 +238,28 @@ do_blockdev_add ${SNAPSHOTS} "" "${TEST_IMG}"
 blockdev_snapshot ${SNAPSHOTS} error
 
 echo
+echo === Invalid command - creating loops ===
+echo
+
+SNAPSHOTS=$((${SNAPSHOTS}+1))
+add_snapshot_image ${SNAPSHOTS}
+
+_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
+                     'arguments': { 'node':'snap_${SNAPSHOTS}',
+                                    'overlay':'snap_${SNAPSHOTS}' }
+                   }" "error"
+
+SNAPSHOTS=$((${SNAPSHOTS}+1))
+create_snapshot_image ${SNAPSHOTS}
+do_blockdev_add ${SNAPSHOTS} "'backing': 'snap_$((${SNAPSHOTS}-1))', " \
+    "${TEST_DIR}/${SNAPSHOTS}-${snapshot_virt0}"
+
+_send_qemu_cmd $h "{ 'execute': 'blockdev-snapshot',
+                     'arguments': { 'node':'snap_${SNAPSHOTS}',
+                                    'overlay':'snap_$((${SNAPSHOTS}-1))' }
+                   }" "error"
+
+echo
 echo === Invalid command - The node does not exist ===
 echo
 
diff --git a/tests/qemu-iotests/085.out b/tests/qemu-iotests/085.out
index 1d4c565b6d..b543b992ff 100644
--- a/tests/qemu-iotests/085.out
+++ b/tests/qemu-iotests/085.out
@@ -217,15 +217,42 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/
                                      'overlay':'snap_13' } }
 {"error": {"class": "GenericError", "desc": "The overlay already has a backing image"}}
 
+=== Invalid command - creating loops ===
+
+Formatting 'TEST_DIR/14-snapshot-v0.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/13-snapshot-v0.IMGFMT backing_fmt=IMGFMT
+{ 'execute': 'blockdev-add', 'arguments':
+           { 'driver': 'IMGFMT', 'node-name': 'snap_14', 'backing': null,
+             'file':
+             { 'driver': 'file', 'filename': 'TEST_DIR/14-snapshot-v0.IMGFMT',
+               'node-name': 'file_14' } } }
+{"return": {}}
+{ 'execute': 'blockdev-snapshot',
+                     'arguments': { 'node':'snap_14',
+                                    'overlay':'snap_14' }
+                   }
+{"error": {"class": "GenericError", "desc": "Making 'snap_14' a backing child of 'snap_14' would create a cycle"}}
+Formatting 'TEST_DIR/15-snapshot-v0.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/14-snapshot-v0.IMGFMT backing_fmt=IMGFMT
+{ 'execute': 'blockdev-add', 'arguments':
+           { 'driver': 'IMGFMT', 'node-name': 'snap_15', 'backing': 'snap_14',
+             'file':
+             { 'driver': 'file', 'filename': 'TEST_DIR/15-snapshot-v0.IMGFMT',
+               'node-name': 'file_15' } } }
+{"return": {}}
+{ 'execute': 'blockdev-snapshot',
+                     'arguments': { 'node':'snap_15',
+                                    'overlay':'snap_14' }
+                   }
+{"error": {"class": "GenericError", "desc": "Making 'snap_15' a backing child of 'snap_14' would create a cycle"}}
+
 === Invalid command - The node does not exist ===
 
 { 'execute': 'blockdev-snapshot',
                       'arguments': { 'node': 'virtio0',
-                                     'overlay':'snap_14' } }
-{"error": {"class": "GenericError", "desc": "Cannot find device='snap_14' nor node-name='snap_14'"}}
+                                     'overlay':'snap_16' } }
+{"error": {"class": "GenericError", "desc": "Cannot find device='snap_16' nor node-name='snap_16'"}}
 { 'execute': 'blockdev-snapshot',
                      'arguments': { 'node':'nodevice',
-                                    'overlay':'snap_13' }
+                                    'overlay':'snap_15' }
                    }
 {"error": {"class": "GenericError", "desc": "Cannot find device='nodevice' nor node-name='nodevice'"}}
 *** done
diff --git a/tests/qemu-iotests/129 b/tests/qemu-iotests/129
index 5251e2669e..c75ec62ecf 100755
--- a/tests/qemu-iotests/129
+++ b/tests/qemu-iotests/129
@@ -77,8 +77,8 @@ class TestStopWithBlockJob(iotests.QMPTestCase):
         self.do_test_stop("drive-backup", device="drive0",
                           target=self.target_img, format=iotests.imgfmt,
                           sync="full",
-                          x_perf={ 'max-chunk': 65536,
-                                   'max-workers': 8 })
+                          x_perf={'max-chunk': 65536,
+                                  'max-workers': 8})
 
     def test_block_commit(self):
         # Add overlay above the source node so that we actually use a
@@ -88,13 +88,13 @@ class TestStopWithBlockJob(iotests.QMPTestCase):
                          '1G')
 
         result = self.vm.qmp('blockdev-add', **{
-                                 'node-name': 'overlay',
-                                 'driver': iotests.imgfmt,
-                                 'file': {
-                                     'driver': 'file',
-                                     'filename': self.overlay_img
-                                 }
-                             })
+            'node-name': 'overlay',
+            'driver': iotests.imgfmt,
+            'file': {
+                'driver': 'file',
+                'filename': self.overlay_img
+            }
+        })
         self.assert_qmp(result, 'return', {})
 
         result = self.vm.qmp('blockdev-snapshot',
diff --git a/tests/qemu-iotests/310 b/tests/qemu-iotests/310
index 9d9c928c4b..33c3411869 100755
--- a/tests/qemu-iotests/310
+++ b/tests/qemu-iotests/310
@@ -48,11 +48,11 @@ with iotests.FilePath('base.img') as base_img_path, \
     assert qemu_io_silent(base_img_path, '-c', 'write -P 1 3M 1M') == 0
     assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
                     '-F', iotests.imgfmt, mid_img_path) == 0
-    assert qemu_io_silent(mid_img_path,  '-c', 'write -P 3 2M 1M') == 0
-    assert qemu_io_silent(mid_img_path,  '-c', 'write -P 3 4M 1M') == 0
+    assert qemu_io_silent(mid_img_path, '-c', 'write -P 3 2M 1M') == 0
+    assert qemu_io_silent(mid_img_path, '-c', 'write -P 3 4M 1M') == 0
     assert qemu_img('create', '-f', iotests.imgfmt, '-b', mid_img_path,
                     '-F', iotests.imgfmt, top_img_path) == 0
-    assert qemu_io_silent(top_img_path,  '-c', 'write -P 2 1M 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'write -P 2 1M 1M') == 0
 
 #      0 1 2 3 4
 # top    2
@@ -108,10 +108,10 @@ with iotests.FilePath('base.img') as base_img_path, \
     assert qemu_img('rebase', '-u', '-b', '', '-f', iotests.imgfmt,
                     top_img_path) == 0
 
-    assert qemu_io_silent(top_img_path,  '-c', 'read -P 0 0 1M') == 0
-    assert qemu_io_silent(top_img_path,  '-c', 'read -P 2 1M 1M') == 0
-    assert qemu_io_silent(top_img_path,  '-c', 'read -P 3 2M 1M') == 0
-    assert qemu_io_silent(top_img_path,  '-c', 'read -P 0 3M 1M') == 0
-    assert qemu_io_silent(top_img_path,  '-c', 'read -P 3 4M 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'read -P 0 0 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'read -P 2 1M 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'read -P 3 2M 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'read -P 0 3M 1M') == 0
+    assert qemu_io_silent(top_img_path, '-c', 'read -P 3 4M 1M') == 0
 
     log('Done')
diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index da1bfb839e..43a4b694cc 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -37,13 +37,14 @@ def make_argparser() -> argparse.ArgumentParser:
 
     p.add_argument('-d', dest='debug', action='store_true', help='debug')
     p.add_argument('-p', dest='print', action='store_true',
-                help='redirects qemu\'s stdout and stderr to the test output')
+                   help='redirects qemu\'s stdout and stderr to '
+                        'the test output')
     p.add_argument('-gdb', action='store_true',
-                   help="start gdbserver with $GDB_OPTIONS options \
-                        ('localhost:12345' if $GDB_OPTIONS is empty)")
+                   help="start gdbserver with $GDB_OPTIONS options "
+                        "('localhost:12345' if $GDB_OPTIONS is empty)")
     p.add_argument('-valgrind', action='store_true',
-                    help='use valgrind, sets VALGRIND_QEMU environment '
-                    'variable')
+                   help='use valgrind, sets VALGRIND_QEMU environment '
+                        'variable')
 
     p.add_argument('-misalign', action='store_true',
                    help='misalign memory allocations')
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index e2f9d873ad..83bfedb902 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -621,7 +621,7 @@ class VM(qtest.QEMUQtestMachine):
         super()._post_shutdown()
         if not qemu_valgrind or not self._popen:
             return
-        valgrind_filename =  f"{test_dir}/{self._popen.pid}.valgrind"
+        valgrind_filename = f"{test_dir}/{self._popen.pid}.valgrind"
         if self.exitcode() == 99:
             with open(valgrind_filename, encoding='utf-8') as f:
                 print(f.read())
@@ -1363,8 +1363,9 @@ class ReproducibleStreamWrapper:
 
 class ReproducibleTestRunner(unittest.TextTestRunner):
     def __init__(self, stream: Optional[TextIO] = None,
-             resultclass: Type[unittest.TestResult] = ReproducibleTestResult,
-             **kwargs: Any) -> None:
+                 resultclass: Type[unittest.TestResult] =
+                 ReproducibleTestResult,
+                 **kwargs: Any) -> None:
         rstream = ReproducibleStreamWrapper(stream or sys.stdout)
         super().__init__(stream=rstream,           # type: ignore
                          descriptions=True,
diff --git a/tests/qemu-iotests/tests/image-fleecing b/tests/qemu-iotests/tests/image-fleecing
index 35164e9036..a58b5a1781 100755
--- a/tests/qemu-iotests/tests/image-fleecing
+++ b/tests/qemu-iotests/tests/image-fleecing
@@ -115,8 +115,8 @@ def do_test(use_cbw, base_img_path, fleece_img_path, nbd_sock_path, vm):
 
     nbd_uri = 'nbd+unix:///%s?socket=%s' % (tmp_node, nbd_sock_path)
     log(vm.qmp('nbd-server-start',
-               {'addr': { 'type': 'unix',
-                          'data': { 'path': nbd_sock_path } } }))
+               {'addr': {'type': 'unix',
+                         'data': {'path': nbd_sock_path}}}))
 
     log(vm.qmp('nbd-server-add', device=tmp_node))