record child for grouped images, correct logging in ImageUpdate

store/image.go

@@ -24,6 +24,7 @@ type Image struct {
 	User                  string `json:"user"`
 	Source                string `json:"source"`
 	Parent                string `json:"parent"`
+	Child                 string `json:"child"`
 	Commentary            string `json:"commentary"`
 	CommentaryTranslation string `json:"commentary_translation"`
 }
@@ -302,27 +303,61 @@ func (s *Store) ImageUpdate(hash, source, parent, commentary, commentaryTranslat
 	s.getLock(hash).Lock()
 	defer s.getLock(hash).Unlock()
 
+	var msg string
+
 	// Update and save
 	if source != "\000" {
 		info.Source = source
+		msg += "source"
 	}
-	if parent != "\000" && s.ImageSnowflake(parent).Snowflake == parent {
+	if parent != "\000" {
+		if p := s.ImageSnowflake(parent); p.Snowflake == parent {
+			s.getLock(p.Hash).Lock()
+			defer s.getLock(p.Hash).Unlock()
+
 			info.Parent = parent
+
+			// Update the parent to reflect the child
+			p.Child = info.Snowflake
+			s.imageMetadataWrite(p)
+
+			if msg != "" {
+				msg += ", "
+			}
+			msg += "parent " + parent
+		}
 	}
 	if commentary != "\000" {
 		info.Commentary = commentary
+
+		if msg != "" {
+			msg += ", "
+		}
+		msg += "commentary"
 	}
 	if commentaryTranslation != "\000" {
 		info.CommentaryTranslation = commentaryTranslation
+
+		if msg != "" {
+			msg += ", "
 		}
+		msg += "commentary translation"
+	}
+
+	if msg != "" {
+		s.imageMetadataWrite(info)
+		log.Infof("Image %s %s updated.", info.Snowflake, msg)
+	}
+}
+
+func (s *Store) imageMetadataWrite(info Image) {
 	if payload, err := json.Marshal(info); err != nil {
-		s.fatalClose(fmt.Sprintf("Error encoding metadata of image %s while updating, %s", hash, err))
+		s.fatalClose(fmt.Sprintf("Error encoding metadata of image %s, %s", info.Hash, err))
 	} else {
-		if err = os.WriteFile(s.ImageMetadataPath(hash), payload, s.PermissionFile); err != nil {
-			s.fatalClose(fmt.Sprintf("Error saving metadata of image %s while updating, %s", hash, err))
+		if err = os.WriteFile(s.ImageMetadataPath(info.Hash), payload, s.PermissionFile); err != nil {
+			s.fatalClose(fmt.Sprintf("Error saving metadata of image %s, %s", info.Hash, err))
 		}
 	}
-	log.Infof("Image hash %s source set to %s.", hash, source)
 }
 
 // ImageSnowflakes returns a slice of image snowflakes.