Add customizable container labels (#146)

environment/config.go

@@ -8,6 +8,7 @@ type Settings struct {
 	Mounts      []Mount
 	Allocations Allocations
 	Limits      Limits
+	Labels      map[string]string
 }
 
 // Defines the actual configuration struct for the environment with all of the settings
@@ -68,6 +69,14 @@ func (c *Configuration) Mounts() []Mount {
 	return c.settings.Mounts
 }
 
+// Labels returns the container labels associated with this instance.
+func (c *Configuration) Labels() map[string]string {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	return c.settings.Labels
+}
+
 // Returns the environment variables associated with this instance.
 func (c *Configuration) EnvironmentVariables() []string {
 	c.mu.RLock()

environment/docker/container.go

@@ -174,6 +174,16 @@ func (e *Environment) Create() error {
 		}
 	}
 
+	// Merge user-provided labels with system labels
+	confLabels := e.Configuration.Labels()
+	labels := make(map[string]string, 2+len(confLabels))
+
+	for key := range confLabels {
+		labels[key] = confLabels[key]
+	}
+	labels["Service"] = "Pterodactyl"
+	labels["ContainerType"] = "server_process"
+
 	conf := &container.Config{
 		Hostname:     e.Id,
 		Domainname:   config.Get().Docker.Domainname,
@@ -186,10 +196,7 @@ func (e *Environment) Create() error {
 		ExposedPorts: a.Exposed(),
 		Image:        strings.TrimPrefix(e.meta.Image, "~"),
 		Env:          e.Configuration.EnvironmentVariables(),
-		Labels: map[string]string{
-			"Service":       "Pterodactyl",
-			"ContainerType": "server_process",
-		},
+		Labels:       labels,
 	}
 
 	networkMode := container.NetworkMode(config.Get().Docker.Network.Mode)