Move cli/cmd into cli/internal

cli/internal/cmd/readconfig.go

@@ -0,0 +1,43 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/edgelesssys/constellation/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/internal/config"
+	"github.com/edgelesssys/constellation/internal/file"
+)
+
+func readConfig(out io.Writer, fileHandler file.Handler, name string, provider cloudprovider.Provider) (*config.Config, error) {
+	cnf, err := config.FromFile(fileHandler, name)
+	if err != nil {
+		return nil, err
+	}
+	if err := validateConfig(out, cnf, provider); err != nil {
+		return nil, err
+	}
+	return cnf, nil
+}
+
+func validateConfig(out io.Writer, cnf *config.Config, provider cloudprovider.Provider) error {
+	msgs, err := cnf.Validate()
+	if err != nil {
+		return err
+	}
+
+	if len(msgs) > 0 {
+		fmt.Fprintln(out, "Invalid fields in config file:")
+		for _, m := range msgs {
+			fmt.Fprintln(out, "\t"+m)
+		}
+		return errors.New("invalid configuration")
+	}
+
+	if provider != cloudprovider.Unknown && !cnf.HasProvider(provider) {
+		return fmt.Errorf("configuration doesn't contain provider: %v", provider)
+	}
+
+	return nil
+}