Rkt driver clears task environment variables

client/driver/rkt.go

@@ -114,6 +114,11 @@ func (d *RktDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, e
 
 	// Inject the environment variables.
 	envVars := TaskEnvironmentVariables(ctx, task)
+
+	// Clear the task directories as they are not currently supported.
+	envVars.ClearTaskLocalDir()
+	envVars.ClearAllocDir()
+
 	for k, v := range envVars.Map() {
 		cmd_args = append(cmd_args, fmt.Sprintf("--set-env=%v=%v", k, v))
 	}

website/source/docs/drivers/rkt.html.md

@@ -30,7 +30,8 @@ hash, ACI address or docker registry.
 
 The `Rkt` driver does not currently support mounting the `alloc/` and `local/`
 directory. It is currently blocked by this [Rkt
-issue](https://github.com/coreos/rkt/issues/761).
+issue](https://github.com/coreos/rkt/issues/761). As such the coresponding
+[environment variables](/docs/jobspec/environment.html#task_dir) are not set.
 
 ## Client Requirements
 

website/source/docs/jobspec/environment.html.md

@@ -56,7 +56,7 @@ exported as environment variables for consistency, e.g. `NOMAD_PORT_5000`.
 
 Please see the relevant driver documentation for details.
 
-### Task Directories
+<a id="task_dir">### Task Directories</a>
 
 Nomad makes the following two directories available to tasks: