Support location.lab-controller hw requirement for mrack (#2927)

spec/hardware/location.fmf

@@ -14,6 +14,10 @@ description: |
 
 example:
   - |
-    # Select a system that is not managed by deprecated lab controllers
+    # Select a system that is not managed lab-01.foo.bar.com lab controller
     location:
-        lab-controller: "!~ deprecated-lab-.*.foo.bar.com"
+        lab-controller: "!= lab-01.foo.bar.com"
+
+link:
+  - implemented-by: /tmt/steps/provision/mrack.py
+    note: "``==`` and ``!=`` operators only"

tests/unit/provision/mrack/test_hw.py

@@ -10,6 +10,7 @@
     _parse_cpu,
     _parse_disk,
     _parse_hostname,
+    _parse_location,
     _parse_memory,
     _parse_virtualization,
     _parse_zcrypt,
@@ -225,7 +226,12 @@ def test_maximal_constraint(root_logger: Logger) -> None:
                     '_value': '%.foo.redhat.com'
                     }
                 },
-            {'or': []},
+            {
+                'labcontroller': {
+                    '_op': '!=',
+                    '_value': 'lab-1.bar.redhat.com'
+                    }
+                },
             {
                 'and': [
                     {'or': []},
@@ -280,7 +286,8 @@ def test_maximal_constraint(root_logger: Logger) -> None:
                             }
                         }
                     ]
-                }
+                },
+
             ]
         }
 
@@ -675,3 +682,26 @@ def test_zcrypt_mode(root_logger: Logger) -> None:
                 }
             }
         }
+
+
+def test_location_lab_controller(root_logger: Logger) -> None:
+
+    result = _CONSTRAINT_TRANSFORMERS['location.lab_controller'](
+        _parse_location({"lab-controller": "lab-01.bar.redhat.com"}), root_logger)
+
+    assert result.to_mrack() == {
+        'labcontroller': {
+            '_op': '==',
+            '_value': 'lab-01.bar.redhat.com'
+            }
+        }
+
+    result = _CONSTRAINT_TRANSFORMERS['location.lab_controller'](
+        _parse_location({"lab-controller": "!= lab-01.bar.redhat.com"}), root_logger)
+
+    assert result.to_mrack() == {
+        'labcontroller': {
+            '_op': '!=',
+            '_value': 'lab-01.bar.redhat.com'
+            }
+        }

tmt/steps/provision/mrack.py

@@ -433,6 +433,27 @@ def _transform_zcrypt_mode(
         children=[MrackHWKeyValue('ZCRYPT_MODE', beaker_operator, actual_value)])
 
 
+def _transform_location_lab_controller(
+        constraint: tmt.hardware.TextConstraint,
+        logger: tmt.log.Logger) -> MrackBaseHWElement:
+    if constraint.operator not in [tmt.hardware.Operator.EQ, tmt.hardware.Operator.NEQ]:
+        raise ProvisionError(
+            f"Cannot apply hardware requirement '{constraint}', operator not supported.")
+    beaker_operator, actual_value, negate = operator_to_beaker_op(
+        constraint.operator,
+        constraint.value)
+
+    if negate:
+        return MrackHWNotGroup(children=[
+            MrackHWBinOp('labcontroller', beaker_operator, actual_value)
+            ])
+
+    return MrackHWBinOp(
+        'labcontroller',
+        beaker_operator,
+        actual_value)
+
+
 ConstraintTransformer = Callable[[
     tmt.hardware.Constraint[Any], tmt.log.Logger], MrackBaseHWElement]
 
@@ -446,6 +467,7 @@ def _transform_zcrypt_mode(
     'disk.model_name': _transform_disk_model_name,  # type: ignore[dict-item]
     'disk.size': _transform_disk_size,  # type: ignore[dict-item]
     'hostname': _transform_hostname,  # type: ignore[dict-item]
+    'location.lab_controller': _transform_location_lab_controller,  # type: ignore[dict-item]
     'memory': _transform_memory,  # type: ignore[dict-item]
     'virtualization.is_virtualized':
         _transform_virtualization_is_virtualized,  # type: ignore[dict-item]