package cli import ( "io/ioutil" "os" "strings" "github.com/containous/traefik/v2/pkg/config/file" "github.com/containous/traefik/v2/pkg/config/flag" "github.com/containous/traefik/v2/pkg/log" ) // FileLoader loads a configuration from a file. type FileLoader struct { ConfigFileFlag string filename string } // GetFilename returns the configuration file if any. func (f *FileLoader) GetFilename() string { return f.filename } // Load loads the command's configuration from a file either specified with the -traefik.configfile flag, or from default locations. func (f *FileLoader) Load(args []string, cmd *Command) (bool, error) { ref, err := flag.Parse(args, cmd.Configuration) if err != nil { _ = PrintHelp(os.Stdout, cmd) return false, err } configFileFlag := "traefik.configfile" if _, ok := ref["traefik.configFile"]; ok { configFileFlag = "traefik.configFile" } if f.ConfigFileFlag != "" { configFileFlag = "traefik." + f.ConfigFileFlag if _, ok := ref[strings.ToLower(configFileFlag)]; ok { configFileFlag = "traefik." + strings.ToLower(f.ConfigFileFlag) } } configFile, err := loadConfigFiles(ref[configFileFlag], cmd.Configuration) if err != nil { return false, err } f.filename = configFile if configFile == "" { return false, nil } logger := log.WithoutContext() logger.Printf("Configuration loaded from file: %s", configFile) content, _ := ioutil.ReadFile(configFile) logger.Debug(string(content)) return true, nil } // loadConfigFiles tries to decode the given configuration file and all default locations for the configuration file. // It stops as soon as decoding one of them is successful. func loadConfigFiles(configFile string, element interface{}) (string, error) { finder := Finder{ BasePaths: []string{"/etc/traefik/traefik", "$XDG_CONFIG_HOME/traefik", "$HOME/.config/traefik", "./traefik"}, Extensions: []string{"toml", "yaml", "yml"}, } filePath, err := finder.Find(configFile) if err != nil { return "", err } if len(filePath) == 0 { return "", nil } if err = file.Decode(filePath, element); err != nil { return "", err } return filePath, nil }