AB#2327 move debugd code into internal folder (#403)

* move debugd code into internal folder
* Fix paths in CMakeLists.txt
Signed-off-by: Fabian Kammel <fk@edgeless.systems>

debugd/internal/cdbg/config/config.go

@@ -0,0 +1,35 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"io/fs"
+
+	"github.com/edgelesssys/constellation/debugd/internal/debugd/deploy"
+	configc "github.com/edgelesssys/constellation/internal/config"
+	"github.com/edgelesssys/constellation/internal/file"
+)
+
+// CDBGConfig describes the constellation-cli config file.
+type CDBGConfig struct {
+	ConstellationDebugConfig ConstellationDebugdConfig `yaml:"cdbg"`
+}
+
+// ConstellationDebugdConfig is the cdbg specific configuration.
+type ConstellationDebugdConfig struct {
+	AuthorizedKeys   []configc.UserKey    `yaml:"authorizedKeys"`
+	BootstrapperPath string               `yaml:"bootstrapperPath"`
+	SystemdUnits     []deploy.SystemdUnit `yaml:"systemdUnits,omitempty"`
+}
+
+// FromFile reads a debug configuration.
+func FromFile(fileHandler file.Handler, name string) (*CDBGConfig, error) {
+	conf := &CDBGConfig{}
+	if err := fileHandler.ReadYAML(name, conf); err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			return nil, fmt.Errorf("%s not found - consult the README on how to setup cdbg", name)
+		}
+		return nil, fmt.Errorf("loading config from file %s: %w", name, err)
+	}
+	return conf, nil
+}