$ git clone -n https://gitee.com/mgb01105731/xz.git /var/lib/mock/dist-an27-build-527698-79680/root/chroot_tmpdir/scmroot/xz
Cloning into '/var/lib/mock/dist-an27-build-527698-79680/root/chroot_tmpdir/scmroot/xz'...
$ git fetch origin a27:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/xz
 * [new branch]      a27        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfb82c8 Init package