$ git clone -n https://src.fedoraproject.org/rpms/R-usethis.git /var/lib/mock/f38-build-side-42-init-devel-1084639-29979/root/chroot_tmpdir/scmroot/R-usethis
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1084639-29979/root/chroot_tmpdir/scmroot/R-usethis'...
$ git fetch origin e4f3e61813896879b99b81bc081a93e7036ead7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-usethis
 * [new ref]         e4f3e61813896879b99b81bc081a93e7036ead7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4f3e61 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild