$ git clone -n https://gitee.com/wangpingping000/libpng.git /var/lib/mock/dist-an23-build-146206-57727/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-an23-build-146206-57727/root/chroot_tmpdir/scmroot/libpng'...
$ git reset --hard a8bcefbb3b8406c3400fd76242c3c3ad5fa8e09e
HEAD is now at a8bcefb optimise spec file