change default paths for oCIS services

ocis-pkg/config/defaults/paths.go

@@ -0,0 +1,42 @@
+package defaults
+
+import (
+	"log"
+	"os"
+	"path"
+)
+
+const ()
+
+var (
+	// switch between modes
+	BaseDataPathType string = "homedir"
+	// don't read from this, only write
+	BaseDataPathValue string = "/var/lib/ocis"
+)
+
+func BaseDataPath() string {
+
+	// It is not nice to have hidden / secrete configuration options
+	// But how can we update the base path for every occurence with a flageset option?
+	// This is currenlty not possible and needs a new configuration concept
+	p := os.Getenv("OCIS_BASE_DATA_PATH")
+	if p != "" {
+		return p
+	}
+
+	switch BaseDataPathType {
+	case "homedir":
+		dir, err := os.UserHomeDir()
+		if err != nil {
+			// fallback to BaseDatapathValue for users without home
+			return BaseDataPathValue
+		}
+		return path.Join(dir, ".ocis")
+	case "path":
+		return BaseDataPathValue
+	default:
+		log.Fatalf("BaseDataPathType %s not found", BaseDataPathType)
+		return ""
+	}
+}