$ git clone -n https://src.fedoraproject.org/rpms/gromacs.git /var/lib/mock/f45-build-13056-446/root/chroot_tmpdir/scmroot/gromacs
Cloning into '/var/lib/mock/f45-build-13056-446/root/chroot_tmpdir/scmroot/gromacs'...
$ git fetch origin 57724d463ce6eaee125eec3aa6d79122f1bed4a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gromacs
 * [new ref]         57724d463ce6eaee125eec3aa6d79122f1bed4a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57724d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild