Comment # 2 on bug 906589 from grant k

NOT restricted to non-official repos,

    ...
    Checking whether to refresh metadata for OS13-update
    Retrieving: repomd.xml
........................................................................................[done]
    Retrieving: repomd.xml
........................................................................................[done]
    Retrieving: repomd.xml.asc
....................................................................................[done]
    Retrieving: repomd.xml.key
....................................................................................[done]
    Retrieving: repomd.xml
........................................................................................[done]
    File 'repomd.xml' from repository 'OS13-update' is signed with an unknown
key 'B88B2FD43DBDC284'. Continue? [yes/no] (no): 
    ...