$ git clone -n https://gitee.com/zhangwenlong01/systemd.git /var/lib/mock/dist-an23-build-320750-67940/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/dist-an23-build-320750-67940/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin 1b3f878c7cb8cf14a9e28bbf7b5a486c390e7dd0:KOJI_FETCH_HEAD
From https://gitee.com/zhangwenlong01/systemd
 * [new ref]         1b3f878c7cb8cf14a9e28bbf7b5a486c390e7dd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b3f878 add loongarch64 support for systemd