$ git clone -n https://src.fedoraproject.org/rpms/rubygem-opengl.git /var/lib/mock/f31-build-52671-27716/root/thebuilddir/tmp/scmroot/rubygem-opengl
Cloning into '/var/lib/mock/f31-build-52671-27716/root/thebuilddir/tmp/scmroot/rubygem-opengl'...
$ git reset --hard dbf4692deddefd4716ab2e1eb1179c0a1d95bc41
HEAD is now at dbf4692 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild