$ git clone -n https://src.fedoraproject.org/rpms/gtk3.git /var/lib/mock/f33-build-296648-55761/root/chroot_tmpdir/scmroot/gtk3
Cloning into '/var/lib/mock/f33-build-296648-55761/root/chroot_tmpdir/scmroot/gtk3'...
$ git reset --hard 21ca746ba8ea466147ed023f66fd0ef1ca3b6fc5
HEAD is now at 21ca746 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild