#!/bin/sh
#----------------------------------------------------------------------------
# /var/install/bin/nginx-module-check  Check nginx module dependencies
#
# Creation:     2016-03-03 ap
# Last Update:  $Id$
#
# Copyright (c) 2016-2022 Ansgar Puester, ansgar.puester(at)freenet(dot)de
#
# 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.
#
# nginx tool to check module dependencies
#
# Arguments:
#   None
#
# Returns:
#   None
#
#----------------------------------------------------------------------------

#include eislib
. /var/install/include/eislib

ASK=/var/install/bin/ask
CAT=/bin/cat
RM=/bin/rm
MKTEMP=/bin/mktemp

module_path=/var/lib/nginx/modules

# ---------------------------------------------------------------------------
# check module
# ---------------------------------------------------------------------------
check_module()
{
   act_module=$1
   echo
   echo
   mecho --info "Analysis for modul $act_module"

   check_module_short "${act_module}"
   RC=$?
   if [ "${RC}" = 0 ]; then
      echo
      echo "Missing libraries:"
      ldd ${module_path}/${act_module} | grep -e '=>[[:space:]]not found' | cut -f2 | sed -E 's/[[:space:]].*//'
      echo
      echo "Install the required libraries and try again"
   else
      echo "No additional libraries required"
   fi
   echo
}

# ---------------------------------------------------------------------------
# check module short
#  return
#    1    no missing libs
#    0    missing libs
# ---------------------------------------------------------------------------
check_module_short()
{
   # readelf   requires binutils
   # objdump   requires binutils
   #readelf -d ${module_path}/${act_module} | awk '/NEEDED/ { print $5 } '
   #objdump -p ${module_path}/${act_module} | grep NEEDED

   act_module=$1
   ldd ${module_path}/${act_module} | grep -e '=>[[:space:]]not found' >/dev/null 2>&1
   return $?
}

# ---------------------------------------------------------------------------
# print modules
# ---------------------------------------------------------------------------
print_modules()
{
   declare -A module_tab

   clrhome
   mecho --info 'Available nginx modules'
   echo

   techo --begin '3 4r 1 50 1 13'
   techo --row '' No '' module '' 'missing libs'

   idx=0
   modules=$(find ${module_path} -name '*.so' -printf '%f\n' | sort)
   for module in ${modules}
   do
      #echo ${module}
      idx=$(/usr/bin/expr ${idx} + 1)
      check_module_short ${module}
      rc=$?
      [ "${rc}" = 1 ] && miss='No' || miss='yes'
      techo --row '' "${idx}" '' "${module}" '' "${miss}"
      eval module_tab[$idx]=${module}
   done
   techo --end
   echo

   _ask_file=$(${MKTEMP} -t .XXXXXXXXXXXXX)
   ${ASK} 'Select for detailed check' '' "1-${idx}" '^$=Return' '0=Exit' >${_ask_file}
   rc=${?}
   read _module_to_check < ${_ask_file}
   ${RM} -f ${_ask_file}

   if [ ${rc} = 255 ]
   then
       _module_to_check=0
   fi

   case ${_module_to_check} in
   '') exit 0    ;;
   0)  exit 127  ;;
   *)
       eval selected_module=${module_tab[${_module_to_check}]}
       #echo "selected_module=${selected_module}"
       check_module ${selected_module}
       anykey
       ;;
   esac

}


# ---------------------------------------------------------------------------
# main
# ---------------------------------------------------------------------------
main()
{
   while true
   do
      print_modules
   done
}


# ---------------------------------------------------------------------------
# call function main
# ---------------------------------------------------------------------------
main "${@}"

# ---------------------------------------------------------------------------
# end
# ---------------------------------------------------------------------------