Setup remote environment shared with Teleport

teleport.sh

# /etc/profile.d/teleport.sh
# Set environment in Teleport session

if [ -n "${SSH_TELEPORT_USER}" ]
then
  USER_FIRSTNAME=$(echo "${SSH_TELEPORT_USER%%@*}" | cut -d'.' -f1)
  USER_LASTNAME=$(echo "${SSH_TELEPORT_USER%%@*}" | cut -d'.' -f2)
  export USER_FULLNAME="${USER_FIRSTNAME^} ${USER_LASTNAME^}"
  export GIT_AUTHOR_NAME="${USER_FULLNAME}"
  export GIT_AUTHOR_EMAIL="${SSH_TELEPORT_USER}"

  export GIT_COMMITTER_NAME="${USER_FULLNAME}"
  export GIT_COMMITTER_EMAIL="${SSH_TELEPORT_USER}"

  export EMAIL="${SSH_TELEPORT_USER}"

  export TELEPORT_USER_CONF_DIR="${HOME}/.teleport/${SSH_TELEPORT_USER}"

  mkdir -p "${TELEPORT_USER_CONF_DIR}"
  export HISTFILE="${TELEPORT_USER_CONF_DIR}/history"

  if [ -f /usr/bin/byobu ]
  then
    export BYOBU_CONFIG_DIR="${TELEPORT_USER_CONF_DIR}/byobu"
    mkdir -p "${BYOBU_CONFIG_DIR}"
    TMUX_CMD=byobu
  else
    TMUX_CMD=tmux
  fi

  export TMUX_SESSION=$(echo $SSH_TELEPORT_USER | sha1sum | cut -c1-8)
  echo "Launching tmux sesssion ($TMUX_SESSION)"
  if $TMUX_CMD ls -F '#{session_name}' | grep $TMUX_SESSION 2>/dev/null >&2
  then
    exec $TMUX_CMD -f ${TELEPORT_USER_CONF_DIR}/tmux.conf a -t $TMUX_SESSION
  else
    exec $TMUX_CMD -f ${TELEPORT_USER_CONF_DIR}/tmux.conf new -s $TMUX_SESSION
  fi
fi