$ git clone -n https://src.fedoraproject.org/rpms/x11vnc.git /var/lib/mock/f45-build-38578-725/root/chroot_tmpdir/scmroot/x11vnc
Cloning into '/var/lib/mock/f45-build-38578-725/root/chroot_tmpdir/scmroot/x11vnc'...
$ git fetch origin 7940c913ef939569a3e36faefb5b01181cd01106:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x11vnc
 * [new ref]         7940c913ef939569a3e36faefb5b01181cd01106 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7940c91 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild