выполняет первоначальное копирование базы данных пакета yum (8)  (Performs an initial copy-up of yum(8) package database.)
  
Имя (Name)
yum-ovl - Performs an initial copy-up of yum(8) package database.
Параметры (Options)
-d debug-level If debug level is 2 and more, print out the number
       of files copied up from the lower layer
Описание (Description)
Opening a file on OverlayFS in read-only mode causes the file
       from
       lower layer to be opened, then later on, if the same file is
       opened
       in write mode, a copy-up into the upper    layer    takes
       place,
       resulting into a new file being opened.
       Since yum(8) needs to open the RPMdb first read-only, and then
       also with write access, we need to copy-up the files beforehand
       to
       make sure that the access is consistent.
Файлы (Files)
/usr/lib/yum-plugins/ovl.py Plugin itself
       /etc/yum/pluginconf.d/ovl.conf Configuration file allowing to
       enable/disable the plugin