[ssdhealth] Check for default device before falling back to discovery

show/platform.py

@@ -104,7 +104,21 @@ def psustatus(index, json, verbose):
 def ssdhealth(device, verbose, vendor):
     """Show SSD Health information"""
     if not device:
-        device = os.popen("lsblk -o NAME,TYPE -p | grep disk").readline().strip().split()[0]
+        platform_data = device_info.get_platform_json_data()
+        # Check if there is any default disk for this platform
+        # {
+        #     "chassis": {
+        #         ..........
+        #         "disk": {
+        #             "device" : "/dev/nvme0n1"
+        #         }
+        #     }
+        # }
+        device = platform_data.get("chassis", {}).get("disk", {}).get("device", None)
+        if not device:
+            # Fallback to discovery
+            device = os.popen("lsblk -o NAME,TYPE -p | grep disk").readline().strip().split()[0]
+
     cmd = ['sudo', 'ssdutil', '-d', str(device)]
     options = ["-v"] if verbose else []
     options += ["-e"] if vendor else []

tests/show_platform_test.py

@@ -87,3 +87,40 @@ def test_verbose(self):
             CliRunner().invoke(show.cli.commands['platform'].commands['psustatus'], ['--verbose'])
         assert mock_run_command.call_count == 1
         mock_run_command.assert_called_with(['psushow', '-s'], display_cmd=True)
+
+class TestShowPlatformSsdhealth(object):
+    # Test 'show platform ssdhealth'
+    @mock.patch('utilities_common.cli.run_command')
+    def test_ssdhealth(self, mock_run_command):
+        result = CliRunner().invoke(show.cli.commands['platform'].commands['ssdhealth'], ["/dev/nvme0n1", '--verbose'])
+        assert result.exit_code == 0, result.output
+        assert mock_run_command.call_count == 1
+        mock_run_command.assert_called_with(['sudo', 'ssdutil', '-d', '/dev/nvme0n1', '-v'], display_cmd=True)
+
+    @mock.patch('os.popen')
+    @mock.patch('utilities_common.cli.run_command')
+    @mock.patch('sonic_py_common.device_info.get_platform_json_data')
+    def test_ssdhealth_default_device(self, mock_plat_json, mock_run_command, mock_open):
+        mock_plat_json.return_value = {
+            "chassis" : {
+                 "name" : "mock_platform"
+            }
+        }
+        mock_fd = mock.MagicMock()
+        mock_fd.readline.return_value = "/dev/nvme0n1     disk\n"
+        mock_open.return_value = mock_fd
+        result = CliRunner().invoke(show.cli.commands['platform'].commands['ssdhealth'], ['--verbose'])
+        mock_open.assert_called_with("lsblk -o NAME,TYPE -p | grep disk")
+        mock_run_command.assert_called_with(['sudo', 'ssdutil', '-d', '/dev/nvme0n1', '-v'], display_cmd=True)
+
+        mock_plat_json.return_value = {
+            "chassis" : {
+                "name" : "mock_platform2",
+                "disk" :  {
+                    "device" : "/dev/nvme0n1"
+                }
+            }
+        }
+        result = CliRunner().invoke(show.cli.commands['platform'].commands['ssdhealth'], ['--verbose'])
+        mock_plat_json.assert_called_with()
+        mock_run_command.assert_called_with(['sudo', 'ssdutil', '-d', '/dev/nvme0n1', '-v'], display_cmd=True)