Config file reading/writing.

utils/config.go

@@ -0,0 +1,47 @@
+package utils
+
+import (
+	"encoding/json"
+	"os"
+)
+
+// ConfigStructure is structure of main configuration
+type ConfigStructure struct {
+	RootDir             string `json:"rootDir"`
+	DownloadConcurrency int    `json:"downloadConcurrency"`
+}
+
+// Config is configuration for aptly, shared by all modules
+var Config = ConfigStructure{
+	RootDir:             "/var/aptly",
+	DownloadConcurrency: 4,
+}
+
+// LoadConfig loads configuration from json file
+func LoadConfig(filename string, config *ConfigStructure) error {
+	f, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	dec := json.NewDecoder(f)
+	return dec.Decode(&config)
+}
+
+// SaveConfig write configuration to json file
+func SaveConfig(filename string, config *ConfigStructure) error {
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	encoded, err := json.MarshalIndent(&config, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write(encoded)
+	return err
+}