$ git clone -n https://src.fedoraproject.org/rpms/libretro-bsnes-mercury.git /var/lib/mock/f45-build-16892-493/root/chroot_tmpdir/scmroot/libretro-bsnes-mercury
Cloning into '/var/lib/mock/f45-build-16892-493/root/chroot_tmpdir/scmroot/libretro-bsnes-mercury'...
$ git fetch origin 52703744efe9123ea1e7f82c78a347f68ca030c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretro-bsnes-mercury
 * [new ref]         52703744efe9123ea1e7f82c78a347f68ca030c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5270374 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild