$ git clone -n https://src.fedoraproject.org/rpms/trackballs.git /var/lib/mock/f45-build-37369-714/root/chroot_tmpdir/scmroot/trackballs
Cloning into '/var/lib/mock/f45-build-37369-714/root/chroot_tmpdir/scmroot/trackballs'...
$ git fetch origin 586236c00aeb45a7972bcab2e71543e371ff8e5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trackballs
 * [new ref]         586236c00aeb45a7972bcab2e71543e371ff8e5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 586236c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild