$ git clone -n https://src.fedoraproject.org/rpms/libretro-prosystem.git /var/lib/mock/f40-build-2008277-45359/root/chroot_tmpdir/scmroot/libretro-prosystem
Cloning into '/var/lib/mock/f40-build-2008277-45359/root/chroot_tmpdir/scmroot/libretro-prosystem'...
$ git fetch origin 39edd17d8f295462700a55f1450d837e5ed33ac5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretro-prosystem
 * [new ref]         39edd17d8f295462700a55f1450d837e5ed33ac5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39edd17 chore: Update to latest git snapshot