$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng.git /var/lib/mock/dist-oc8-build-242684-83021/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-oc8-build-242684-83021/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 303cb10f590ca985c0654f09b47f9fc37960d59f:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng
 * [new ref]         303cb10f590ca985c0654f09b47f9fc37960d59f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 303cb10 import libpng-1.6.34-11.tl3