$ git clone -n https://src.fedoraproject.org/rpms/R-corpus.git /var/lib/mock/f41-build-2044788-25295/root/chroot_tmpdir/scmroot/R-corpus
Cloning into '/var/lib/mock/f41-build-2044788-25295/root/chroot_tmpdir/scmroot/R-corpus'...
$ git fetch origin d51993e3c75c045ac93485c7753002afba95f588:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-corpus
 * [new ref]         d51993e3c75c045ac93485c7753002afba95f588 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d51993e Removed from CRAN