runtracker_retcode

#! /usr/bin/env bash
# vim: ft=sh

###############################################################################
### Usage:
###   runtracker_retcode id command
###
###     id - the identifier used to locate and store output (logs)
###     command - the command to execute
###
### Runs the provided command, only returning any output in the case that there
### is an non zero return code from the command execution.
###############################################################################

MY_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source ${MY_DIR}/utils

COMMAND_ID=$1
shift
COMMAND=$@
debug "COMMAND: ${COMMAND}"

TEMP_LOG=$(mktemp ${TMPDIR}rtrc.XXXXXXXX).log
# just to make sure we clean up after ourselves
trap "[ -e "${TEMP_LOG}" ] && rm ${TEMP_LOG}" EXIT
debug "Temporary logfile: ${TEMP_LOG}"

OUTPUT_DIR=${OUTPUT_ROOT}/${COMMAND_ID}

debug cwd: $PWD
$( exec 9>${TEMP_LOG}; exec 1>&9 ; exec 2>&9 ; eval "$COMMAND"  )
COMMAND_RETCODE=$?
debug command output:
debug $(cat ${TEMP_LOG})
if [ $COMMAND_RETCODE -ne 0 ]; then
  debug 'non zero return code, logging'
  if [ -r "${TEMP_LOG}" ]; then
    mkdir -p ${OUTPUT_DIR} # JIC
    mv "${TEMP_LOG}" "${OUTPUT_DIR}/${RUN_INDICATOR}"
  else
    error strange, the temporary log file ${TEMP_LOG} is gone
  fi
fi