$ git clone -n https://src.fedoraproject.org/rpms/R-Rsolid.git /var/lib/mock/f42-build-864690-172514/root/chroot_tmpdir/scmroot/R-Rsolid
Cloning into '/var/lib/mock/f42-build-864690-172514/root/chroot_tmpdir/scmroot/R-Rsolid'...
$ git fetch origin 30854ee4328002108ff7cb12f275a407f88de7fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Rsolid
 * [new ref]         30854ee4328002108ff7cb12f275a407f88de7fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30854ee Rebuild for hdf5 1.14.5