$ git clone -n https://gitee.com/fundawang/libpng.git /var/lib/mock/dist-an23-build-132621-47020/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-an23-build-132621-47020/root/chroot_tmpdir/scmroot/libpng'...
$ git reset --hard 17e250dacbfb4e7f27bd9e35dcecba0f9f8376e8
HEAD is now at 17e250d 1.6.38