$ git clone -n https://src.fedoraproject.org/rpms/libretro-beetle-vb.git /var/lib/mock/f45-build-16907-493/root/chroot_tmpdir/scmroot/libretro-beetle-vb
Cloning into '/var/lib/mock/f45-build-16907-493/root/chroot_tmpdir/scmroot/libretro-beetle-vb'...
$ git fetch origin 50f0200cc6dd0a7b42cebb3957c0a68d93801dc3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretro-beetle-vb
 * [new ref]         50f0200cc6dd0a7b42cebb3957c0a68d93801dc3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50f0200 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild