$ git clone -n https://src.fedoraproject.org/rpms/R-gitcreds.git /var/lib/mock/f45-build-6139-346/root/chroot_tmpdir/scmroot/R-gitcreds
Cloning into '/var/lib/mock/f45-build-6139-346/root/chroot_tmpdir/scmroot/R-gitcreds'...
$ git fetch origin 25625a17fb71a31e207544a887d0bcd0242a20b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gitcreds
 * [new ref]         25625a17fb71a31e207544a887d0bcd0242a20b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25625a1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild