$ git clone -n https://src.fedoraproject.org/rpms/R-tikzDevice /var/lib/mock/f41-build-side-1-3149141-40244/root/chroot_tmpdir/scmroot/R-tikzDevice
Cloning into '/var/lib/mock/f41-build-side-1-3149141-40244/root/chroot_tmpdir/scmroot/R-tikzDevice'...
$ git fetch origin 1638099e05de96a7ae09acf0c2d70e55baf74691:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tikzDevice
 * [new ref]         1638099e05de96a7ae09acf0c2d70e55baf74691 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1638099 convert GPLv2+ license to SPDX