#!/bin/bash

# debops-task: run ansible with some customization
# Copyright (C) 2014 Maciej Delmanowski <drybjed@gmail.com>
# Part of the DebOps project - http://debops.org/


# This program is free software; you can redistribute
# it and/or modify it under the terms of the
# GNU General Public License as published by the Free
# Software Foundation; either version 2 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 General Public
# License for more details.
#
# You should have received a copy of the GNU General
# Public License along with this program; if not,
# write to the Free Software Foundation, Inc., 59
# Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# An on-line copy of the GNU General Public License can
# be downloaded from the FSF web page at:
# http://www.gnu.org/copyleft/gpl.html


set -e

# ---- Global constants ----

declare -r DEBOPS_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}/debops"
declare -r DEBOPS_CONFIG=".debops.cfg"
declare -r DEBOPS_INVENTORY="inventory"
declare -r SCRIPT_NAME="$(basename ${0})"

declare -r DEBOPS_RESERVED_NAMES=( task init update defaults padlock )


# ---- Configuration variables ----

# Don't check SSH fingerprint on connection (to enable, set INSECURE=1 on the
# command line)
[ -z "${INSECURE}" ] && INSECURE=0

# List of possible inventory directories, relative to DebOps root project directory
ANSIBLE_INVENTORY_PATHS=( "ansible/${DEBOPS_INVENTORY}" "${DEBOPS_INVENTORY}" )


# ---- Main script ----

# Check if we are in DebOps project directory
if [ ! -f ${PWD}/${DEBOPS_CONFIG} ] ; then
  echo >&2 "${SCRIPT_NAME}: Fatal: not a DebOps project directory" ; exit 1
fi

# Check if ansible-playbook is available
if ! type ansible > /dev/null 2>&1 ; then
  echo >&2 "${SCRIPT_NAME}: Error: ansible: command not found" ; exit 1
fi

# Check if Ansible inventory can be found in local directory
if [ -f ${PWD}/${DEBOPS_CONFIG} ] ; then
  for inventory_path in "${ANSIBLE_INVENTORY_PATHS[@]}" ; do
    if [ -d ${inventory_path} ] ; then
      ansible_inventory="${inventory_path}"
      break
    fi
  done
fi

# Get module name from the script name if script is named 'debops-*'
module=""
module_name=${SCRIPT_NAME##*-}
name_match=0
for name in "${DEBOPS_RESERVED_NAMES[@]}" ; do
    if [[ ${name} = "${module_name}" ]] ; then
        name_match=1
        break
    fi
done
if [[ ${name_match} = 0 ]] ; then
    module="-m ${module_name}"
fi

# Run ansible with specified parameters
if [ -z "${ansible_inventory}" ] ; then
  echo >&2 "${SCRIPT_NAME}: Error: Ansible inventory not found" ; exit 1
else
  export ANSIBLE_HOSTS="${ansible_inventory}"

  # Allow insecure SSH connections if requested
  if [ ${INSECURE} -gt 0 ] ; then
    export ANSIBLE_HOST_KEY_CHECKING=False
  fi

  # Run ansible with custom environment
  ansible ${module} "${@}"
fi

