$ git clone -n https://src.fedoraproject.org/rpms/mednafen.git /var/lib/mock/f45-build-18215-511/root/chroot_tmpdir/scmroot/mednafen
Cloning into '/var/lib/mock/f45-build-18215-511/root/chroot_tmpdir/scmroot/mednafen'...
$ git fetch origin 3c6b7b845627cb6f989041829a37610b1ffd8fd2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mednafen
 * [new ref]         3c6b7b845627cb6f989041829a37610b1ffd8fd2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c6b7b8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild