[202012] Update load minigraph to load backend acl (#2235)

Signed-off-by: Neetha John <nejo@microsoft.com>

Backport #2236

What I did
Load backend acl template as part of the load minigraph if the device type is a 'BackEndToRRouter' and the device is a storage device

How to verify it
Added unit tests to verify if the backend acl load commands are applied

config/main.py

@@ -970,6 +970,40 @@ def validate_ipv4_address(ctx, param, ip_addr):
     except ValueError as e:
         raise click.UsageError(str(e))
 
+def _is_storage_device(cfg_db):
+    """
+    Check if the device is a storage device or not
+    """
+    device_metadata = cfg_db.get_entry("DEVICE_METADATA", "localhost")
+    return device_metadata.get("storage_device", "Unknown") == "true"
+
+def _is_acl_table_present(cfg_db, acl_table_name):
+    """
+    Check if acl table exists
+    """
+    return acl_table_name in cfg_db.get_keys("ACL_TABLE")
+
+def load_backend_acl(cfg_db, device_type):
+    """
+    Load acl on backend storage device
+    """
+
+    BACKEND_ACL_TEMPLATE_FILE = os.path.join('/', "usr", "share", "sonic", "templates", "backend_acl.j2")
+    BACKEND_ACL_FILE = os.path.join('/', "etc", "sonic", "backend_acl.json")
+
+    if device_type and device_type == "BackEndToRRouter" and _is_storage_device(cfg_db) and _is_acl_table_present(cfg_db, "DATAACL"):
+        if os.path.isfile(BACKEND_ACL_TEMPLATE_FILE):
+            clicommon.run_command(
+                "{} -d -t {},{}".format(
+                    SONIC_CFGGEN_PATH,
+                    BACKEND_ACL_TEMPLATE_FILE,
+                    BACKEND_ACL_FILE
+                ),
+                display_cmd=True
+            )
+        if os.path.isfile(BACKEND_ACL_FILE):
+            clicommon.run_command("acl-loader update incremental {}".format(BACKEND_ACL_FILE), display_cmd=True)
+
 
 # This is our main entrypoint - the main 'config' command
 @click.group(cls=clicommon.AbbreviationGroup, context_settings=CONTEXT_SETTINGS)
@@ -1351,6 +1385,12 @@ def load_minigraph(db, no_service_restart):
     if os.path.isfile('/etc/sonic/acl.json'):
         clicommon.run_command("acl-loader update full /etc/sonic/acl.json", display_cmd=True)
 
+    # get the device type
+    device_type = _get_device_type()
+
+    # Load backend acl
+    load_backend_acl(db.cfgdb, device_type)
+
     # Load port_config.json
     try:
         load_port_config(db.cfgdb, '/etc/sonic/port_config.json')
@@ -1360,8 +1400,6 @@ def load_minigraph(db, no_service_restart):
     # generate QoS and Buffer configs
     clicommon.run_command("config qos reload --no-dynamic-buffer", display_cmd=True)
 
-    # get the device type
-    device_type = _get_device_type()
     if device_type != 'MgmtToRRouter' and device_type != 'MgmtTsToR' and device_type != 'BmcMgmtToRRouter' and device_type != 'EPMS':
         clicommon.run_command("pfcwd start_default", display_cmd=True)
 

tests/config_test.py

@@ -141,6 +141,49 @@ def test_load_minigraph_with_port_config(self, get_cmd_module, setup_single_broa
             port_config = [{"PORT": {"Ethernet0": {"admin_status": "up"}}}]
             self.check_port_config(db, config, port_config, "config interface startup Ethernet0")
 
+    def test_load_backend_acl(self, get_cmd_module, setup_single_broadcom_asic):
+        db = Db()
+        db.cfgdb.set_entry("DEVICE_METADATA", "localhost", {"storage_device": "true"})
+        self.check_backend_acl(get_cmd_module, db, device_type='BackEndToRRouter', condition=True)
+
+    def test_load_backend_acl_not_storage(self, get_cmd_module, setup_single_broadcom_asic):
+        db = Db()
+        self.check_backend_acl(get_cmd_module, db, device_type='BackEndToRRouter', condition=False)
+
+    def test_load_backend_acl_storage_leaf(self, get_cmd_module, setup_single_broadcom_asic):
+        db = Db()
+        db.cfgdb.set_entry("DEVICE_METADATA", "localhost", {"storage_device": "true"})
+        self.check_backend_acl(get_cmd_module, db, device_type='BackEndLeafRouter', condition=False)
+
+    def test_load_backend_acl_storage_no_dataacl(self, get_cmd_module, setup_single_broadcom_asic):
+        db = Db()
+        db.cfgdb.set_entry("DEVICE_METADATA", "localhost", {"storage_device": "true"})
+        db.cfgdb.set_entry("ACL_TABLE", "DATAACL", None)
+        self.check_backend_acl(get_cmd_module, db, device_type='BackEndToRRouter', condition=False)
+
+    def check_backend_acl(self, get_cmd_module, db, device_type='BackEndToRRouter', condition=True):
+        def is_file_side_effect(filename):
+            return True if 'backend_acl' in filename else False
+        with mock.patch('os.path.isfile', mock.MagicMock(side_effect=is_file_side_effect)):
+            with mock.patch('config.main._get_device_type', mock.MagicMock(return_value=device_type)):
+                with mock.patch(
+                    "utilities_common.cli.run_command",
+                    mock.MagicMock(side_effect=mock_run_command_side_effect)) as mock_run_command:
+                    (config, show) = get_cmd_module
+                    runner = CliRunner()
+                    result = runner.invoke(config.config.commands["load_minigraph"], ["-y"], obj=db)
+                    print(result.exit_code)
+                    expected_output = ['Running command: acl-loader update incremental /etc/sonic/backend_acl.json',
+                                       'Running command: /usr/local/bin/sonic-cfggen -d -t /usr/share/sonic/templates/backend_acl.j2,/etc/sonic/backend_acl.json'
+                                      ]
+                    print(result.output)
+                    assert result.exit_code == 0
+                    output = result.output.split('\n')
+                    if condition:
+                        assert set(expected_output).issubset(set(output))
+                    else:
+                        assert not(set(expected_output).issubset(set(output)))
+
     def check_port_config(self, db, config, port_config, expected_output):
         def read_json_file_side_effect(filename):
             return port_config