The "media=cdrom" parameter is also used on some Avocado tests as a
way to protect files from being written.  The tests here bring a more
fundamental check that this behavior can be trusted.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
---
 tests/avocado/cdrom.py | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 tests/avocado/cdrom.py

diff --git a/tests/avocado/cdrom.py b/tests/avocado/cdrom.py
new file mode 100644
index 0000000000..c9aa5d69cb
--- /dev/null
+++ b/tests/avocado/cdrom.py
@@ -0,0 +1,41 @@
+# Simple functional tests for cdrom devices
+#
+# Copyright (c) 2023 Red Hat, Inc.
+#
+# Author:
+#  Cleber Rosa <crosa@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+import os
+
+from avocado.utils.iso9660 import iso9660
+from avocado_qemu import QemuSystemTest
+
+
+class Cdrom(QemuSystemTest):
+    """
+    :avocado: tags=block,cdrom,quick
+    :avocado: tags=machine:none
+    """
+    def setUp(self):
+        super().setUp()
+        self.iso_path = os.path.join(self.workdir, "cdrom.iso")
+        iso = iso9660(self.iso_path)
+        iso.create()
+        iso.close()
+
+    def test_plain_iso_rw(self):
+        self.vm.add_args('-drive', f'file={self.iso_path}')
+        self.vm.launch()
+        query_block_result = self.vm.qmp('query-block')['return']
+        self.assertEqual(len(query_block_result), 1)
+        self.assertFalse(query_block_result[0]["inserted"]["ro"])
+
+    def test_media_cdrom_ro(self):
+        self.vm.add_args('-drive', f'file={self.iso_path},media=cdrom')
+        self.vm.launch()
+        query_block_result = self.vm.qmp('query-block')['return']
+        self.assertEqual(len(query_block_result), 1)
+        self.assertTrue(query_block_result[0]["inserted"]["ro"])
-- 
2.45.2

On 06/08/2024 19.31, Cleber Rosa wrote:
> The "media=cdrom" parameter is also used on some Avocado tests as a
> way to protect files from being written.  The tests here bring a more
> fundamental check that this behavior can be trusted.
> 
> Signed-off-by: Cleber Rosa <crosa@redhat.com>
> ---
>   tests/avocado/cdrom.py | 41 +++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 41 insertions(+)
>   create mode 100644 tests/avocado/cdrom.py
> 
> diff --git a/tests/avocado/cdrom.py b/tests/avocado/cdrom.py
> new file mode 100644
> index 0000000000..c9aa5d69cb
> --- /dev/null
> +++ b/tests/avocado/cdrom.py
> @@ -0,0 +1,41 @@
> +# Simple functional tests for cdrom devices
> +#
> +# Copyright (c) 2023 Red Hat, Inc.
> +#
> +# Author:
> +#  Cleber Rosa <crosa@redhat.com>
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or
> +# later.  See the COPYING file in the top-level directory.
> +
> +import os
> +
> +from avocado.utils.iso9660 import iso9660
> +from avocado_qemu import QemuSystemTest
> +
> +
> +class Cdrom(QemuSystemTest):
> +    """
> +    :avocado: tags=block,cdrom,quick
> +    :avocado: tags=machine:none
> +    """
> +    def setUp(self):
> +        super().setUp()
> +        self.iso_path = os.path.join(self.workdir, "cdrom.iso")
> +        iso = iso9660(self.iso_path)
> +        iso.create()
> +        iso.close()
> +
> +    def test_plain_iso_rw(self):
> +        self.vm.add_args('-drive', f'file={self.iso_path}')
> +        self.vm.launch()
> +        query_block_result = self.vm.qmp('query-block')['return']
> +        self.assertEqual(len(query_block_result), 1)
> +        self.assertFalse(query_block_result[0]["inserted"]["ro"])
> +
> +    def test_media_cdrom_ro(self):
> +        self.vm.add_args('-drive', f'file={self.iso_path},media=cdrom')
> +        self.vm.launch()
> +        query_block_result = self.vm.qmp('query-block')['return']
> +        self.assertEqual(len(query_block_result), 1)
> +        self.assertTrue(query_block_result[0]["inserted"]["ro"])

I think such a test would be a better fit for the qemu-iotests, e.g. 
tests/qemu-iotests/118 looks pretty similar already, maybe this could be 
added there instead?

  Thomas