$ git clone -n https://src.fedoraproject.org/rpms/python-stestr.git /var/lib/mock/f38-build-side-42-init-devel-716492-27293/root/chroot_tmpdir/scmroot/python-stestr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-716492-27293/root/chroot_tmpdir/scmroot/python-stestr'...
$ git fetch origin 599a99e7b651f093569074e924de1ed63246e15e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-stestr
 * [new ref]         599a99e7b651f093569074e924de1ed63246e15e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 599a99e Update to latest upstream (#1482280)