Initial QSfera import

Server/vendor/github.com/cpuguy83/dockercfg/load.go

@@ -0,0 +1,55 @@
+package dockercfg
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// UserHomeConfigPath returns the path to the docker config in the current user's home dir.
+func UserHomeConfigPath() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", fmt.Errorf("user home dir: %w", err)
+	}
+
+	return filepath.Join(home, ".docker", "config.json"), nil
+}
+
+// ConfigPath returns the path to the docker cli config.
+//
+// It will either use the DOCKER_CONFIG env var if set, or the value from [UserHomeConfigPath]
+// DOCKER_CONFIG would be the dir path where `config.json` is stored, this returns the path to config.json.
+func ConfigPath() (string, error) {
+	if p := os.Getenv("DOCKER_CONFIG"); p != "" {
+		return filepath.Join(p, "config.json"), nil
+	}
+	return UserHomeConfigPath()
+}
+
+// LoadDefaultConfig loads the docker cli config from the path returned from [ConfigPath].
+func LoadDefaultConfig() (Config, error) {
+	var cfg Config
+	p, err := ConfigPath()
+	if err != nil {
+		return cfg, fmt.Errorf("config path: %w", err)
+	}
+
+	return cfg, FromFile(p, &cfg)
+}
+
+// FromFile loads config from the specified path into cfg.
+func FromFile(configPath string, cfg *Config) error {
+	f, err := os.Open(configPath)
+	if err != nil {
+		return fmt.Errorf("open config: %w", err)
+	}
+	defer f.Close()
+
+	if err = json.NewDecoder(f).Decode(&cfg); err != nil {
+		return fmt.Errorf("decode config: %w", err)
+	}
+
+	return nil
+}