#!/bin/bash
#
# Execute commands on multiple nodes.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with this program.  If not, see
# <http://www.gnu.org/licenses/>.

# Issue commands with pssh
function mass_pssh {
  hydra_install_package pssh
  parallel-ssh -P -p 4 -t 0 -h $TMPWORK sudo $COMMAND
}

# Issue commands with a for loop
function mass_loop {
  for node in `cat $TMPWORK`; do
    echo "Connecting to $node..."
    $HYDRA_CONNECT $node sudo $COMMAND
  done
}

# Issue commands with dish
function mass_dish {
  hydra_install_package dish
  dish -f -p /dev/null -e "sudo $COMMAND" -g $TMPWORK
}

# Issue commands with mussh
function mass_mussh {
  hydra_install_package mussh
  mussh -H $TMPWORK -c "sudo $COMMAND"
}

# Set nodes
function mass_set_nodes {
  hydra_set_tmpfile nodes
  hydra $HYDRA nodes $1 > $TMPWORK
}

# Execute command on localhost
function mass_exec_localhost {
  if grep -q -e "^$LOCAL$" $TMPWORK; then
    # Remove localhost from node list
    grep -v -e "^$LOCAL$" $TMPWORK > $TMPWORK.tmp
    mv $TMPWORK.tmp $TMPWORK

    echo "Issuing command on localhost..."
    $SUDO $COMMAND
  fi
}

# Load
source $APP_BASE/lib/hydra/functions || exit 1
hydra_config_load

# Command line arguments
BASENAME="`basename $0`"
COMMAND="$*"

# Initial node list
BASEDIR="/tmp"
LOCAL="`facter fqdn`"
mass_set_nodes

# Set sudo config
if [ "$WHOAMI" != 'root' ]; then
  sudo="sudo"
else
  echo "Sorry, cannot run as root"
  exit 1
fi

# Validation
if [ "$BASENAME" == "mass-upgrade" ]; then
  COMMAND="DEBIAN_FRONTEND=noninteractive hydractl upgrade clean"
elif [ "$BASENAME" == "mass-web" ]; then
  mass_set_nodes web
fi

# Execute commands in hosts
echo "Issuing $COMMAND on multiple nodes..."
mass_exec_localhost
mass_pssh
hydra_unset_tmpfile $TMPWORK