[#44] node: Support multiple configs

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

cmd/frostfs-node/config/config.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/TrueCloudLab/frostfs-node/cmd/frostfs-node/config/internal"
+	"github.com/TrueCloudLab/frostfs-node/pkg/util/config"
 	"github.com/spf13/viper"
 )
 
@@ -54,6 +55,12 @@ func New(_ Prm, opts ...Option) *Config {
 		}
 	}
 
+	if o.configDir != "" {
+		if err := config.ReadConfigDir(v, o.configDir); err != nil {
+			panic(fmt.Errorf("failed to read config dir: %w", err))
+		}
+	}
+
 	return &Config{
 		v:    v,
 		opts: *o,
@@ -69,5 +76,11 @@ func (x *Config) Reload() error {
 		}
 	}
 
+	if x.opts.configDir != "" {
+		if err := config.ReadConfigDir(x.v, x.opts.configDir); err != nil {
+			return fmt.Errorf("rereading configuration dir: %w", err)
+		}
+	}
+
 	return nil
 }

cmd/frostfs-node/config/opts.go

@@ -1,7 +1,8 @@
 package config
 
 type opts struct {
-	path string
+	path      string
+	configDir string
 }
 
 func defaultOpts() *opts {
@@ -18,3 +19,11 @@ func WithConfigFile(path string) Option {
 		o.path = path
 	}
 }
+
+// WithConfigDir returns an option to set the system path
+// to the directory with configuration files.
+func WithConfigDir(path string) Option {
+	return func(o *opts) {
+		o.configDir = path
+	}
+}

cmd/frostfs-node/main.go

@@ -34,6 +34,7 @@ func fatalOnErrDetails(details string, err error) {
 
 func main() {
 	configFile := flag.String("config", "", "path to config")
+	configDir := flag.String("config-dir", "", "path to config directory")
 	versionFlag := flag.Bool("version", false, "frostfs node version")
 	dryRunFlag := flag.Bool("check", false, "validate configuration and exit")
 	flag.Parse()
@@ -44,7 +45,7 @@ func main() {
 		os.Exit(SuccessReturnCode)
 	}
 
-	appCfg := config.New(config.Prm{}, config.WithConfigFile(*configFile))
+	appCfg := config.New(config.Prm{}, config.WithConfigFile(*configFile), config.WithConfigDir(*configDir))
 
 	err := validateConfig(appCfg)
 	fatalOnErr(err)