$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng.git /var/lib/mock/dist-oc9-build-42438-14591/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-oc9-build-42438-14591/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04104c0 import libpng-1.6.37-3.tl4