$ git clone -n https://src.fedoraproject.org/rpms/rakarrack.git /var/lib/mock/f45-build-34292-683/root/chroot_tmpdir/scmroot/rakarrack
Cloning into '/var/lib/mock/f45-build-34292-683/root/chroot_tmpdir/scmroot/rakarrack'...
$ git fetch origin 7fb7fffb7e4cd7e35f47e69fc1b7571300a07f12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rakarrack
 * [new ref]         7fb7fffb7e4cd7e35f47e69fc1b7571300a07f12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fb7fff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild