$ git clone -n https://src.fedoraproject.org/rpms/kcharselect.git /var/lib/mock/f42-build-side-1-3498687-45963/root/chroot_tmpdir/scmroot/kcharselect
Cloning into '/var/lib/mock/f42-build-side-1-3498687-45963/root/chroot_tmpdir/scmroot/kcharselect'...
$ git fetch origin 6c6a6b4f43f9f535c0613fbbcb781b57bc3825b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcharselect
 * [new ref]         6c6a6b4f43f9f535c0613fbbcb781b57bc3825b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c6a6b4 25.04.0