$ git clone -n https://src.fedoraproject.org/rpms/R-Rhtslib.git /var/lib/mock/f45-build-5941-345/root/chroot_tmpdir/scmroot/R-Rhtslib
Cloning into '/var/lib/mock/f45-build-5941-345/root/chroot_tmpdir/scmroot/R-Rhtslib'...
$ git fetch origin a163f389a436a634730683a81b3b5d0705bb70ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Rhtslib
 * [new ref]         a163f389a436a634730683a81b3b5d0705bb70ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a163f38 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild