$ git clone -n https://src.fedoraproject.org/rpms/R-inline.git /var/lib/mock/f45-build-6178-346/root/chroot_tmpdir/scmroot/R-inline
Cloning into '/var/lib/mock/f45-build-6178-346/root/chroot_tmpdir/scmroot/R-inline'...
$ git fetch origin c8c467b16ba7773e4b9adc3371cf06417a5d3231:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-inline
 * [new ref]         c8c467b16ba7773e4b9adc3371cf06417a5d3231 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8c467b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild