$ git clone -n https://src.fedoraproject.org/rpms/R-showtextdb /var/lib/mock/f41-build-side-1-3149122-40244/root/chroot_tmpdir/scmroot/R-showtextdb
Cloning into '/var/lib/mock/f41-build-side-1-3149122-40244/root/chroot_tmpdir/scmroot/R-showtextdb'...
$ git fetch origin 2072a089984fd100fb961f15b5e784205c4566a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-showtextdb
 * [new ref]         2072a089984fd100fb961f15b5e784205c4566a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2072a08 convert ASL 2.0 license to SPDX