just found out dc and region are going to be a bit different, as Region didn't previously exist in the Node struct.

client/driver/driver.go

@@ -295,6 +295,8 @@ func GetTaskEnv(taskDir *allocdir.TaskDir, node *structs.Node,
 		SetJobName(alloc.Job.Name).
 		SetEnvvars(task.Env).
 		SetTaskName(task.Name)
+		SetDatacenterName(node.Datacenter)
+		SetRegionName(node.Region)
 
 	// Vary paths by filesystem isolation used
 	drv, err := NewDriver(task.Driver, NewEmptyDriverContext())

nomad/structs/structs.go

@@ -735,6 +735,9 @@ type Node struct {
 	// Datacenter for this node
 	Datacenter string
 
+	// Region for this node
+	Region string
+
 	// Node name
 	Name string