$ git clone -n https://gitee.com/src-anolis-os/libcxx.git /var/lib/mock/dist-an23.5-build-540717-84997/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/dist-an23.5-build-540717-84997/root/chroot_tmpdir/scmroot/libcxx'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/src-anolis-os/libcxx
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2087f26 Update to 17.0.6