$ git clone -n https://src.fedoraproject.org/rpms/R-tikzDevice.git /var/lib/mock/f38-build-side-42-init-devel-981941-29038/root/chroot_tmpdir/scmroot/R-tikzDevice
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-981941-29038/root/chroot_tmpdir/scmroot/R-tikzDevice'...
$ git fetch origin 2df19ecec48f1b81d352e1554a8c82441cb80aeb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tikzDevice
 * [new ref]         2df19ecec48f1b81d352e1554a8c82441cb80aeb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2df19ec 0.12.4