$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gtk2.git /var/lib/mock/f31-build-86793-31706/root/chroot_tmpdir/scmroot/rubygem-gtk2
Cloning into '/var/lib/mock/f31-build-86793-31706/root/chroot_tmpdir/scmroot/rubygem-gtk2'...
$ git reset --hard b929ac0f9a8dc7a3cccff98c065bfced25ec8da6
HEAD is now at b929ac0 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild