$ git clone -n https://src.fedoraproject.org/rpms/libretro-prosystem.git /var/lib/mock/f45-build-16894-493/root/chroot_tmpdir/scmroot/libretro-prosystem
Cloning into '/var/lib/mock/f45-build-16894-493/root/chroot_tmpdir/scmroot/libretro-prosystem'...
$ git fetch origin 31a3cc494bf64898d1f389dc5b5248065c0b7fdf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretro-prosystem
 * [new ref]         31a3cc494bf64898d1f389dc5b5248065c0b7fdf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31a3cc4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild