$ git clone -n https://git.cclinux.org/stage/rpms/eigen3.git /var/lib/mock/dist-circle8-build-21050-3844/root/chroot_tmpdir/scmroot/eigen3
Cloning into '/var/lib/mock/dist-circle8-build-21050-3844/root/chroot_tmpdir/scmroot/eigen3'...
$ git reset --hard b2512215cbac28709ee5f9e810c457a754c1213c
HEAD is now at b251221 import eigen3-3.3.4-6.el8