Check matrix conditions correctly

We are using matrix conditions heavily, and without that fix they are
ignored and could lead to undefined variables. With this fix only
matching matrix conditions are getting converted from the legacy format.

yaml/cond.go

@@ -27,6 +27,7 @@ type Conditions struct {
 	Branch   Condition         `json:"branch,omitempty"`
 	Status   Condition         `json:"status,omitempty"`
 	Paths    Condition         `json:"paths,omitempty"`
+	Matrix   map[string]string `json:"matrix,omitempty"`
 }
 
 // Condition defines a runtime condition.

yaml/converter/legacy/internal/config.go

@@ -91,6 +91,40 @@ func Convert(d []byte) ([]byte, error) {
 			current := pipeline
 			current.Name = fmt.Sprintf("matrix-%d", index+1)
 
+			services := make([]*droneyaml.Container, 0)
+			for _, service := range current.Services {
+				if len(service.When.Matrix) == 0 {
+					services = append(services, service)
+					continue
+				}
+
+				for whenKey, whenValue := range service.When.Matrix {
+					for envKey, envValue := range environ {
+						if whenKey == envKey && whenValue == envValue {
+							services = append(services, service)
+						}
+					}
+				}
+			}
+			current.Services = services
+
+			steps := make([]*droneyaml.Container, 0)
+			for _, step := range current.Steps {
+				if len(step.When.Matrix) == 0 {
+					steps = append(steps, step)
+					continue
+				}
+
+				for whenKey, whenValue := range step.When.Matrix {
+					for envKey, envValue := range environ {
+						if whenKey == envKey && whenValue == envValue {
+							steps = append(steps, step)
+						}
+					}
+				}
+			}
+			current.Steps = steps
+
 			marshaled, err := yaml.Marshal(&current)
 
 			if err != nil {
@@ -180,6 +214,7 @@ func toConditions(from Constraints) droneyaml.Conditions {
 			Include: from.Status.Include,
 			Exclude: from.Status.Exclude,
 		},
+		Matrix: from.Matrix,
 	}
 }
 

yaml/converter/legacy/internal/constraint.go

@@ -14,6 +14,7 @@ type (
 		Event       Constraint
 		Branch      Constraint
 		Status      Constraint
+		Matrix      map[string]string
 	}
 
 	// Constraint defines a runtime constraint.