$ git clone -n https://src.fedoraproject.org/rpms/rubygem-opengl.git /var/lib/mock/f39-build-1630284-39618/root/chroot_tmpdir/scmroot/rubygem-opengl
Cloning into '/var/lib/mock/f39-build-1630284-39618/root/chroot_tmpdir/scmroot/rubygem-opengl'...
$ git fetch origin 8cff9ca75a952d1b829c557098624b59e97c790a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-opengl
 * [new ref]         8cff9ca75a952d1b829c557098624b59e97c790a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cff9ca Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild