error_handler

#!/bin/bash

## This file is part of Whonix.
## Copyright (C) 2012 - 2014 Patrick Schleizer <adrelanos@riseup.net>
## See the file COPYING for copying conditions.

error_handler() {
   local exit_code="$?"
   BUG="1"

   local error_cause error_text
   error_text="$1"
   if [ "$error_text" = "" ]; then
      error_cause="$FUNCNAME signal ERR detected with BASH_COMMAND:
$BASH_COMMAND"
   else
      error_cause="$FUNCNAME called with error_text:
$error_text"
   fi

   if [ -d /usr/share/whonix ]; then
      local MSG="<p>###############################################################################
<br></br>## $SCRIPTNAME script bug.
<br></br>## No panic. Nothing is broken. Just some rare condition has been hit.
<br></br>## Try again later. There is likely a solution for this problem.
<br></br>## Please see Whonix News, Whonix Blog and Whonix User Help Forum.
<br></br>## Please report this bug!
<br></br>##
<br></br>## who_ami: $who_ami
<br></br>## identifier: $identifier
<br></br>## exit_code: $exit_code
<br></br>## error_cause: $error_cause
<br></br>##
<br></br>## Experts only:
<br></br>## bash -x $SCRIPTNAME --verbose
<br></br>## for verbose output. Clean the output and report to Whonix developers.
<br></br>#########################################################################</p>"
   else
      local MSG="<p>###############################################################################
<br></br>## $SCRIPTNAME script bug.
<br></br>## No panic. Nothing is broken. Just some rare condition has been hit.
<br></br>## Try again later. There is likely a solution for this problem.
<br></br>## Please see Whonix News, Whonix Blog and Whonix User Help Forum.
<br></br>## Please report this bug!
<br></br>##
<br></br>## who_ami: $who_ami
<br></br>## identifier: $identifier
<br></br>## exit_code: $exit_code
<br></br>## error_cause: $error_cause
<br></br>##
<br></br>## Experts only:
<br></br>## bash -x $SCRIPTNAME --verbose
<br></br>## for verbose output. Clean the output and report to Whonix developers.
<br></br>#########################################################################</p>"
   fi

   ## {{{ add/show error message

   local command_v_output_exit_code
   command_v_output_exit_code="0"
   command -v "$output" >/dev/null || { command_v_output_exit_code="$?" ; true; };
   ## Check if $output command has been already defined. This is not the case,
   ## when the script is terminated very early.
   if [ "$command_v_output_exit_code" = "0" ]; then
      if [ "$TITLE" = "" ]; then
         TITLE="No TITLE defined yet."
      fi
      $output ${output_opts[@]} --titlex "$TITLE"
      $output ${output_opts[@]} --titlecli "$TITLE"
      $output ${output_opts[@]} --messagex --typex "error" --message "$MSG"
      $output ${output_opts[@]} --messagecli --typecli "error" --message "$MSG"
   else
      local stripped_msg
      stripped_msg="$(/usr/lib/msgcollector/striphtml "$MSG")"
      if [ "$stripped_msg" = "" ]; then
         ## In case striphtml failed or is not available.
         echo "$MSG" >&2
      else
         echo "$stripped_msg" >&2
      fi
   fi

   ## }}}

   ## Check if ex_funct command has been already defined. This is not the case,
   ## when the script is terminated very early.
   local command_v_output_exit_code
   command_v_output_exit_code="0"
   command -v "ex_funct" >/dev/null || { command_v_output_exit_code="$?" ; true; };
   if [ "$command_v_output_exit_code" = "0" ]; then
      ## ex_funct exists. It is up to ex_funct to exit.
      echo "$SCRIPTNAME: Error detected. Cleaning up... Exiting..." >&2
      SIGNAL_TYPE="ERR"
      ex_funct || true
      echo "$SCRIPTNAME: Error! ex_funct did not exit!" >&2
      echo "$SCRIPTNAME: Exiting..." >&2
      if [ "$EXIT_CODE" = "" ]; then
         EXIT_CODE="1"
      fi
      exit "$EXIT_CODE"
   fi

   echo "$SCRIPTNAME: Error detected. Skipping ex_funct since not yet load. Exiting..." >&2
   if [ "$EXIT_CODE" = "" ]; then
      EXIT_CODE="1"
   fi
   exit "$EXIT_CODE"
}