$ git clone -n https://gitee.com/uestc-cheng/libxml2.git /var/lib/mock/dist-an8.8-build-299442-65890/root/chroot_tmpdir/scmroot/libxml2
Cloning into '/var/lib/mock/dist-an8.8-build-299442-65890/root/chroot_tmpdir/scmroot/libxml2'...
$ git fetch origin 794abea6cc599819923d403a6b2cdd006fdc69e3:KOJI_FETCH_HEAD
From https://gitee.com/uestc-cheng/libxml2
 * [new ref]         794abea6cc599819923d403a6b2cdd006fdc69e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 794abea add libxml2-2.9.7-CVE-2023-29469.patch.