$ git clone -n https://gitee.com/mgb01105731/libpng.git /var/lib/mock/dist-an23.3-build-420172-72884/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-an23.3-build-420172-72884/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 0c24933019defe9d5c3e5b73c21a0b8212a9fdfc:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/libpng
 * [new ref]         0c24933019defe9d5c3e5b73c21a0b8212a9fdfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c24933 Update to 1.6.40 from 1.6.39