- enabled output if validation error

src/lib/bag.cpp

@@ -213,12 +213,16 @@ bool Bag::validate() {
   }
   if (nullptr == this->payloadmanifest_p) {
     is_valid = false;
+    this->log << "Bagit payload manifest missed!" << endl;
   } else {
     // checksums check
     this->log <<  "Bagit payload manifest" << endl;
     bool ret = this->payloadmanifest_p->validate();
     if (!ret) {
       is_valid = false;
+      stringstream log;
+      this->payloadmanifest_p->get_logstream( log );
+      this->log << log.str();
     }
     if (nullptr != this->payload_p) {
       // check if payload checksums missed for payload files
@@ -259,18 +263,25 @@ bool Bag::validate() {
   }
   // next elements are optional
   if (nullptr == this->tagmanifest_p) {
+      this->log << "Bagit tag manifest is missed" << endl;
   } else {
     this->log << "Bagit tag manifest" << endl;
     bool ret = this->tagmanifest_p->validate();
     if (!ret) {
-      is_valid = false;
+        stringstream log;
+        this->tagmanifest_p->get_logstream( log );
+        this->log << log.str();
+        is_valid = false;
     }
   }
   if (nullptr == this->bagmetadata_p) {
   } else {
     bool ret = this->bagmetadata_p->validate();
     if (!ret) {
-      is_valid = false;
+        stringstream log;
+        this->bagmetadata_p->get_logstream( log );
+        this->log << log.str();
+        is_valid = false;
     }
     if (this->bagmetadata_p->has_PayloadOxum()) {
       // check oxum of payload
@@ -288,7 +299,6 @@ bool Bag::validate() {
 		      is_valid = false;
 	      }
       }
-
     }
   }
   /*