$ git clone -n https://src.fedoraproject.org/rpms/libpng12.git /var/lib/mock/f31-build-59276-28556/root/chroot_tmpdir/scmroot/libpng12
Cloning into '/var/lib/mock/f31-build-59276-28556/root/chroot_tmpdir/scmroot/libpng12'...
$ git reset --hard e22c0109f86c83769b758850c92b82bbd78bbe72
HEAD is now at e22c010 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild