$ git clone -n https://src.fedoraproject.org/rpms/libpng12.git /var/lib/mock/f31-build-69909-30378/root/chroot_tmpdir/scmroot/libpng12
Cloning into '/var/lib/mock/f31-build-69909-30378/root/chroot_tmpdir/scmroot/libpng12'...
$ git reset --hard 74e957871f52fdf8492175ae12193a496d90c3d6
HEAD is now at 74e9578 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild