$ git clone -n https://src.fedoraproject.org/rpms/R-stringi.git /var/lib/mock/f40-build-760503-121099/root/chroot_tmpdir/scmroot/R-stringi
Cloning into '/var/lib/mock/f40-build-760503-121099/root/chroot_tmpdir/scmroot/R-stringi'...
$ git fetch origin 8ee43a64466b0443c6ac943ae2aac3fc2fc2f6cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-stringi
 * [new ref]         8ee43a64466b0443c6ac943ae2aac3fc2fc2f6cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ee43a6 1.8.1