$ git clone -n https://src.fedoraproject.org/rpms/libpng.git /var/lib/mock/f40-build-738673-108080/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/f40-build-738673-108080/root/chroot_tmpdir/scmroot/libpng'...
$ git reset --hard 7fb15c2e899d0cfd6de5564e7853f19cc8a15e78
HEAD is now at 7fb15c2 Update to libpng 1.6.40