$ git clone -n https://gitee.com/fundawang/mpfr.git /var/lib/mock/dist-an23-build-296876-65802/root/chroot_tmpdir/scmroot/mpfr
Cloning into '/var/lib/mock/dist-an23-build-296876-65802/root/chroot_tmpdir/scmroot/mpfr'...
$ git fetch origin 6a046c2bb26bdc2d29ef0e517482547de8a8b335:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/mpfr
 * [new ref]         6a046c2bb26bdc2d29ef0e517482547de8a8b335 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a046c2 4.2.1