$ git clone -n https://src.fedoraproject.org/rpms/gtkmm24.git /var/lib/mock/f31-build-85975-31646/root/chroot_tmpdir/scmroot/gtkmm24
Cloning into '/var/lib/mock/f31-build-85975-31646/root/chroot_tmpdir/scmroot/gtkmm24'...
$ git reset --hard b9f4093d6bc3be3e2e8595581b3e418f7c032f36
HEAD is now at b9f4093 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild