$ git clone -n https://src.fedoraproject.org/rpms/R-png.git /var/lib/mock/f31-build-51542-27410/root/chroot_tmpdir/scmroot/R-png
Cloning into '/var/lib/mock/f31-build-51542-27410/root/chroot_tmpdir/scmroot/R-png'...
$ git reset --hard 2a0f46a001ec841fcb15a1aaa9285f360b0e85e3
HEAD is now at 2a0f46a - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild