$ git clone -n https://gitee.com/uestc-cheng/libxml2.git /var/lib/mock/dist-an8.8-build-299150-65888/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-an8.8-build-299150-65888/root/chroot_tmpdir/scmroot/libxml2'...
$ git reset --hard f746aa4d33a66838f270d8c6dabe0d85927acf95
HEAD is now at f746aa4 update libxml2.spec.