$ git clone -n https://src.fedoraproject.org/rpms/R-gss.git /var/lib/mock/f45-build-6149-346/root/chroot_tmpdir/scmroot/R-gss
Cloning into '/var/lib/mock/f45-build-6149-346/root/chroot_tmpdir/scmroot/R-gss'...
$ git fetch origin 06f31974d8bc929500fee3022f61293464345392:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gss
 * [new ref]         06f31974d8bc929500fee3022f61293464345392 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06f3197 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild