$ git clone -n https://src.fedoraproject.org/rpms/mktorrent.git /var/lib/mock/f45-build-18956-538/root/chroot_tmpdir/scmroot/mktorrent
Cloning into '/var/lib/mock/f45-build-18956-538/root/chroot_tmpdir/scmroot/mktorrent'...
$ git fetch origin 642093765338991b8254701650c2fafd6b396889:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mktorrent
 * [new ref]         642093765338991b8254701650c2fafd6b396889 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6420937 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild