$ git clone -n https://gitee.com/mgb01105731/libpng.git /var/lib/mock/dist-an23.3-build-420585-72884/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-an23.3-build-420585-72884/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 7e2903c302fae9045ce1e2264d3d75c5b37429fe:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/libpng
 * [new ref]         7e2903c302fae9045ce1e2264d3d75c5b37429fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e2903c Update to 1.6.40 from 1.6.39