$ git clone -n https://gitee.com/uestc-cheng/libxml2.git /var/lib/mock/dist-an8.8-build-299458-65890/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-an8.8-build-299458-65890/root/chroot_tmpdir/scmroot/libxml2'...
$ git reset --hard 447ca726c17e6fb73fa35582f982bdd78d451d22
HEAD is now at 447ca72 update libxml2.spec.