$ git clone -n https://gitee.com/uestc-cheng/libxml2.git /var/lib/mock/dist-an8.8-build-299233-65890/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-an8.8-build-299233-65890/root/chroot_tmpdir/scmroot/libxml2'...
$ git reset --hard ea4c31c64178b19ffa0c7ed6fb96f6419adbc889
HEAD is now at ea4c31c update libxml2.spec.