$ git clone -n https://src.fedoraproject.org/forks/packit/rpms/R-commonmark.git /var/lib/mock/f41-build-60947737-6586578/root/chroot_tmpdir/scmroot/R-commonmark
Cloning into '/var/lib/mock/f41-build-60947737-6586578/root/chroot_tmpdir/scmroot/R-commonmark'...
$ git fetch origin ba0e99dddc548fe826deee94e012634eae2e8aa0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/packit/rpms/R-commonmark
 * [new ref]         ba0e99dddc548fe826deee94e012634eae2e8aa0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba0e99d Update to 2.0.0 upstream release