#!/bin/bash
#---------------------------------------------------------------------
# vim:set ts=2 sw=2 et:
#---------------------------------------------------------------------
##
##=head1 SYNOPSIS
##
##
##
##=head1 DESCRIPTION
##
##
##
##=head1 COPYRIGHT
##
## Copyright (C) 2003 Robert Helgesson <rycee@home.se>
## 
##=head1 FUNCTIONS
#---------------------------------------------------------------------


# Always source the utility-functions
. /etc/init.d/smgl_functions


# Reset some environment variables so the script won't get any surprises
PATH="/bin:/sbin:/usr/bin:/usr/sbin"

# Set the default list of init script functions.
FUNCS="start stop restart reload force-reload status"

# /usr/bin/basename might not be available
# $1 - path
basename()
{
  path=$1

  # Strip trailing '/' chars
  while [ -z "${path##*/}" ] ; do
    [ "$path" = "/" ] && { builtin echo "/"; return; }
    path="${path%/}"
  done

  # Remove everything up to (and including) the last '/' char
  path=${path##*/}

  # Print the result
  builtin echo $path
}

# Some variables used in this script
scriptname=$( basename $0 )


##################################


print_error()
{
  $FAILURE
  echo "$scriptname: $*"
  $NORMAL
}

handle_needs()
{
  # Well, if the script doesn't need anything don't bother going further
  [ -z "${!1}" ] && return

  _SUB_NEEDED=1
  for service in ${!1} ; do
    if [ ${service:0:1} == "+" ] ; then
      facility=${service:1}
      service=$( eval builtin echo "\$$facility" )
    fi

    if [ -z "$service" ] ; then
      print_error "Provider for facility $facility not configured."
      [ "$1" == "NEEDS" ] && exit 7
    elif ! need $service ; then
      print_error "Error running requested service $service."
      [ "$1" == "NEEDS" ] && exit 7
    fi
  done
  unset _SUB_NEEDED
}

handle_provides()
{
  # Only run if this script is a facility provider...
  # ... and if the script is not called by use of NEEDS variable...
  # ... and the script action is start

  [ -z "$PROVIDES" -o "${_SUB_NEEDED}" ] && return

  # Find out if this is the script configured by the user to run when the
  # facility is requested.

  parent_provides=$( eval "builtin echo \$$PROVIDES" )

  if [ -z "$parent_provides" ] ; then
    # If some other script already managed to start then exit silently
    #provide "+$PROVIDES" || exit 1
    print_error "Provider for facility $PROVIDES not configured..."
  elif [ "$parent_provides" = "$scriptname" ] ; then
    #provide "+$PROVIDES" || {
    #  print_error "Requested provider for facility $PROVIDES unable to start."
    #  exit 1
    #}
    :
  else
    # This script is not the requested provider
    print_error "not configured as provider of $PROVIDES"
    exit 1
  fi
}

# $1 - action to take (abort, ask, ignore)
_handle_essential_failure()
{
  case "$1" in
    ignore) exit $exit_code
            ;;
    abort)  echo "Starting rescue shell, the computer will be rebooted"
            echo "when logging out..."
            /sbin/sulogin
            /sbin/reboot
            ;;
    ask)    echo "Which action do you wish to take?"
            while true ; do
              read -n 1 -p "[a]bort, [i]gnore: " in
              echo
              case "$in" in
                a)    _handle_essential_failure abort   ;;
                i)    _handle_essential_failure ignore  ;;
                *)    continue                          ;;
              esac
              break   # Just to be sure we don't get an infinite loop
            done
            ;;
    *)      echo -n "Bad value specified for ESSENTIAL_FAIL_ACTION: "
            echo $ESSENTIAL_FAIL_ACTION
            ;;
  esac
}

_handle_exit()
{
  if [ "$1" = "start" ] ; then
    if [ $exit_code -eq 0 -a "$PROGRAM" ] ; then
      ( . /etc/init.d/auto_init ; )
      exit_code=$?
    fi

    if [ $exit_code -ne 0 -a "$ESSENTIAL" = "yes" ] ; then
      . /etc/sysconfig/init
      echo
      echo "Essential script failed..."
      echo
      _handle_essential_failure "$ESSENTIAL_FAIL_ACTION"
    fi
  else
    if [ $exit_code -eq 0 -a "$PROGRAM" ] ; then
      . /etc/init.d/auto_init
    else
      exit $exit_code
    fi
  fi
}

##################################

trap 'exit_code=$? _handle_exit "$@"' EXIT

# Do this in a sub-shell to not pollute namespace with content of facilities.
if [ "$1" = "start" ] ; then
  (
    . /etc/sysconfig/facilities || {
      print_error "Unable to load file containing facility definitions."
      exit 1
    }
    handle_needs "NEEDS"
    handle_needs "WANTS"
    handle_provides
  ) || exit $?
fi


##################################


# Delete variables and functions local to this script
unset parent_provides scriptname print_error handle_needs handle_provides


#---------------------------------------------------------------------
##=back
##
##=head1 LICENSE
##
## This software 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 software 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 software; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
##
#---------------------------------------------------------------------

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