Docker driver: allow to configure working directory

client/driver/docker.go

@@ -96,6 +96,7 @@ type DockerDriverConfig struct {
 	TTY              bool                `mapstructure:"tty"`                // Allocate a Pseudo-TTY
 	Interactive      bool                `mapstructure:"interactive"`        // Keep STDIN open even if not attached
 	ShmSize          int64               `mapstructure:"shm_size"`           // Size of /dev/shm of the container in bytes
+	WorkDir          string              `mapstructure:"work_dir"`           // Working directory inside the container
 }
 
 // Validate validates a docker driver config
@@ -223,6 +224,9 @@ func (d *DockerDriver) Validate(config map[string]interface{}) error {
 			"shm_size": &fields.FieldSchema{
 				Type: fields.TypeInt,
 			},
+			"work_dir": &fields.FieldSchema{
+				Type: fields.TypeString,
+			},
 		},
 	}
 
@@ -386,6 +390,10 @@ func (d *DockerDriver) createContainer(ctx *ExecContext, task *structs.Task,
 		OpenStdin: driverConfig.Interactive,
 	}
 
+	if driverConfig.WorkDir != "" {
+		config.WorkingDir = driverConfig.WorkDir
+	}
+
 	memLimit := int64(task.Resources.MemoryMB) * 1024 * 1024
 	hostConfig := &docker.HostConfig{
 		// Convert MB to bytes. This is an absolute value.

client/driver/docker_test.go

@@ -605,6 +605,24 @@ func TestDockerDNS(t *testing.T) {
 	}
 }
 
+func TestDockerWorkDir(t *testing.T) {
+	t.Parallel()
+	task, _, _ := dockerTask()
+	task.Config["work_dir"] = "/some/path"
+
+	client, handle, cleanup := dockerSetup(t, task)
+	defer cleanup()
+
+	container, err := client.InspectContainer(handle.(*DockerHandle).ContainerID())
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	if want, got := "/some/path", container.Config.WorkingDir; want != got {
+		t.Errorf("Wrong working directory for docker job. Expect: %d, got: %d", want, got)
+	}
+}
+
 func inSlice(needle string, haystack []string) bool {
 	for _, h := range haystack {
 		if h == needle {

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

@@ -107,6 +107,8 @@ The following options are available for use in the job specification.
 
 * `shm_size` - (Optional) The size (bytes) of /dev/shm for the container.
 
+* `work_dir` - (Optional) The working directory inside the container.
+
 ### Container Name
 
 Nomad creates a container after pulling an image. Containers are named