$ git clone -n https://src.fedoraproject.org/rpms/mesa-libGLU.git /var/lib/mock/f41-build-1273133-23132/root/chroot_tmpdir/scmroot/mesa-libGLU
Cloning into '/var/lib/mock/f41-build-1273133-23132/root/chroot_tmpdir/scmroot/mesa-libGLU'...
$ git fetch origin 2d15e1c6d451cc9c6e4a6c553ae08cfc1fcd0f38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mesa-libGLU
 * [new ref]         2d15e1c6d451cc9c6e4a6c553ae08cfc1fcd0f38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d15e1c Don't build-require gl-manpages