Added some comments

client/driver/executor/executor.go

@@ -211,6 +211,7 @@ func (e *UniversalExecutor) Wait() (*ProcessState, error) {
 	return e.exitState, nil
 }
 
+// COMPAT: prior to Nomad 0.3.2, UpdateTask didn't exist.
 // UpdateLogConfig updates the log configuration
 func (e *UniversalExecutor) UpdateLogConfig(logConfig *structs.LogConfig) error {
 	e.ctx.Task.LogConfig = logConfig
@@ -230,6 +231,8 @@ func (e *UniversalExecutor) UpdateLogConfig(logConfig *structs.LogConfig) error
 
 func (e *UniversalExecutor) UpdateTask(task *structs.Task) error {
 	e.ctx.Task = task
+
+	// Updating Log Config
 	fileSize := int64(task.LogConfig.MaxFileSizeMB * 1024 * 1024)
 	e.lro.MaxFiles = task.LogConfig.MaxFiles
 	e.lro.FileSize = fileSize

client/driver/executor/executor_test.go

@@ -125,7 +125,7 @@ func TestExecutor_IsolationAndConstraints(t *testing.T) {
 
 	execCmd.FSIsolation = true
 	execCmd.ResourceLimits = true
-	execCmd.User = "nobody"
+	execCmd.User = cstructs.DefaultUnpriviledgedUser
 
 	executor := NewExecutor(log.New(os.Stdout, "", log.LstdFlags))
 	ps, err := executor.LaunchCmd(&execCmd, ctx)

client/driver/structs/structs.go

@@ -7,6 +7,7 @@ import (
 )
 
 const (
+	// The default user that the executor uses to run tasks
 	DefaultUnpriviledgedUser = "nobody"
 )