$ git clone -n https://src.fedoraproject.org/rpms/R-reticulate.git /var/lib/mock/f38-build-724196-99404/root/chroot_tmpdir/scmroot/R-reticulate
Cloning into '/var/lib/mock/f38-build-724196-99404/root/chroot_tmpdir/scmroot/R-reticulate'...
$ git fetch origin 0d24baf022d35754540dc17549be6b7908e8871d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-reticulate
 * [new ref]         0d24baf022d35754540dc17549be6b7908e8871d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d24baf Ignore vignettes