$ git clone -n https://src.fedoraproject.org/rpms/python-arviz.git /var/lib/mock/f42-build-side-1-3588392-46945/root/chroot_tmpdir/scmroot/python-arviz
Cloning into '/var/lib/mock/f42-build-side-1-3588392-46945/root/chroot_tmpdir/scmroot/python-arviz'...
$ git fetch origin 523b093fb7f48c93f86809777bc0be03aed5a25e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-arviz
 * [new ref]         523b093fb7f48c93f86809777bc0be03aed5a25e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 523b093 Update to new upstream version 0.21.0