$ git clone -n https://gitee.com/uestc-cheng/libxml2_2.git /var/lib/mock/dist-an8.8-build-299742-65890/root/chroot_tmpdir/scmroot/libxml2_2
Cloning into '/var/lib/mock/dist-an8.8-build-299742-65890/root/chroot_tmpdir/scmroot/libxml2_2'...
$ git fetch origin 7075d901f5dbf5ff2b00dd7692e69cefbc9eb544:KOJI_FETCH_HEAD
From https://gitee.com/uestc-cheng/libxml2_2
 * [new ref]         7075d901f5dbf5ff2b00dd7692e69cefbc9eb544 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7075d90 update libxml2.spec.