$ git clone -n https://src.fedoraproject.org/rpms/gtkmm30.git /var/lib/mock/f33-build-296714-55773/root/chroot_tmpdir/scmroot/gtkmm30
Cloning into '/var/lib/mock/f33-build-296714-55773/root/chroot_tmpdir/scmroot/gtkmm30'...
$ git reset --hard c7e07e9a69750c93b8b7b630cef29dee1b396337
HEAD is now at c7e07e9 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild