add: debian file, perform various fixes

internal/watcher/config/config.go

@@ -25,20 +25,23 @@ type Config struct {
 	SensorRateMS int64  `yaml:"sensor_rate_ms"`
 }
 
-func New(source []byte) (*Config, error) {
+func New(source []byte, name string) (*Config, error) {
 	config := &Config{}
 	if err := yaml.Unmarshal(source, config); err != nil {
 		return nil, fmt.Errorf("failed to parse config: %w", err)
 	}
+	config.CameraName = name
 	return config, nil
 }
 
 type Mod struct {
 	filePath string
+	namePath string
 }
 
 func (m *Mod) RegisterFlags(fs *flag.FlagSet) {
 	fs.StringVar(&m.filePath, "watcher_config", "", "path to the watcher configuration")
+	fs.StringVar(&m.namePath, "watcher_name", "/var/lib/dbus/machine-id", "location of the file to pull name from")
 }
 
 func (m *Mod) Get() (*Config, error) {
@@ -47,7 +50,13 @@ func (m *Mod) Get() (*Config, error) {
 		return nil, fmt.Errorf("failed to read file %q: %w", m.filePath, err)
 	}
 
-	config, err := New(bytes)
+	// Override name using a unique ID; we can let users name things in the app
+	myID, err := os.ReadFile(m.namePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read machine ID from %q", m.namePath)
+	}
+
+	config, err := New(bytes, string(myID))
 	if err != nil {
 		return nil, err
 	}