$ git clone -n https://src.fedoraproject.org/rpms/libcxx.git /var/lib/mock/f33-build-339280-58626/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/f33-build-339280-58626/root/chroot_tmpdir/scmroot/libcxx'...
$ git reset --hard 41db51f393c65953d7d98f03bd73ac541b2c4734
HEAD is now at 41db51f 11.0.0-rc1 Release