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lib_name='trap' lib_version=20121026 stderr_log="/dev/shm/stderr.log" # # TO BE SOURCED ONLY ONCE: # ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## if test "${g_libs[$lib_name]+_}"; then return 0 else if test ${#g_libs[@]} == 0; then declare -A g_libs fi g_libs[$lib_name]=$lib_version fi # # MAIN CODE: # ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## set -o pipefail # trace ERR through pipes set -o errtrace # trace ERR through 'time command' and other functions set -o nounset ## set -u : exit the script if you try to use an uninitialised variable set -o errexit ## set -e : exit the script if any statement returns a non-true return value exec 2>"$stderr_log" ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## # # FUNCTION: EXIT_HANDLER # ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## function exit_handler () { local error_code="$?" test $error_code == 0 && return; # # LOCAL VARIABLES: # ------------------------------------------------------------------ # local i=0 local regex='' local mem='' local error_file='' local error_lineno='' local error_message='unknown' local lineno='' # # PRINT THE HEADER: # ------------------------------------------------------------------ # # Color the output if it's an interactive terminal test -t 1 && tput bold; tput setf 4 ## red bold echo -e "\n(!) EXIT HANDLER:\n" # # GETTING LAST ERROR OCCURRED: # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # # # Read last file from the error log # ------------------------------------------------------------------ # if test -f "$stderr_log" then stderr=$( tail -n 1 "$stderr_log" ) rm "$stderr_log" fi # # Managing the line to extract information: # ------------------------------------------------------------------ # if test -n "$stderr" then # Exploding stderr on : mem="$IFS" local shrunk_stderr=$( echo "$stderr" | sed 's/\: /\:/g' ) IFS=':' local stderr_parts=( $shrunk_stderr ) IFS="$mem" # Storing information on the error error_file="${stderr_parts[0]}" error_lineno="${stderr_parts[1]}" error_message="" for (( i = 3; i <= ${#stderr_parts[@]}; i++ )) do error_message="$error_message "${stderr_parts[$i-1]}": " done # Removing last ':' (colon character) error_message="${error_message%:*}" # Trim error_message="$( echo "$error_message" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )" fi # # GETTING BACKTRACE: # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # _backtrace=$( backtrace 2 ) # # MANAGING THE OUTPUT: # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # local lineno="" regex='^([a-z]{1,}) ([0-9]{1,})$' if [[ $error_lineno =~ $regex ]] # The error line was found on the log # (e.g. type 'ff' without quotes wherever) # -------------------------------------------------------------- then local row="${BASH_REMATCH[1]}" lineno="${BASH_REMATCH[2]}" echo -e "FILE:\t\t${error_file}" echo -e "${row^^}:\t\t${lineno}\n" echo -e "ERROR CODE:\t${error_code}" test -t 1 && tput setf 6 ## white yellow echo -e "ERROR MESSAGE:\n$error_message" else regex="^${error_file}\$|^${error_file}\s+|\s+${error_file}\s+|\s+${error_file}\$" if [[ "$_backtrace" =~ $regex ]] # The file was found on the log but not the error line # (could not reproduce this case so far) # ------------------------------------------------------ then echo -e "FILE:\t\t$error_file" echo -e "ROW:\t\tunknown\n" echo -e "ERROR CODE:\t${error_code}" test -t 1 && tput setf 6 ## white yellow echo -e "ERROR MESSAGE:\n${stderr}" # Neither the error line nor the error file was found on the log # (e.g. type 'cp ffd fdf' without quotes wherever) # ------------------------------------------------------ else # # The error file is the first on backtrace list: # Exploding backtrace on newlines mem=$IFS IFS=' ' # # Substring: I keep only the carriage return # (others needed only for tabbing purpose) IFS=${IFS:0:1} local lines=( $_backtrace ) IFS=$mem error_file="" if test -n "${lines[1]}" then array=( ${lines[1]} ) for (( i=2; i<${#array[@]}; i++ )) do error_file="$error_file ${array[$i]}" done # Trim error_file="$( echo "$error_file" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )" fi echo -e "FILE:\t\t$error_file" echo -e "ROW:\t\tunknown\n" echo -e "ERROR CODE:\t${error_code}" test -t 1 && tput setf 6 ## white yellow if test -n "${stderr}" then echo -e "ERROR MESSAGE:\n${stderr}" else echo -e "ERROR MESSAGE:\n${error_message}" fi fi fi # # PRINTING THE BACKTRACE: # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # test -t 1 && tput setf 7 ## white bold echo -e "\n$_backtrace\n" # # EXITING: # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # test -t 1 && tput setf 4 ## red bold echo "Exiting!" test -t 1 && tput sgr0 # Reset terminal exit "$error_code" } trap exit_handler EXIT # ! ! ! TRAP EXIT ! ! ! trap exit ERR # ! ! ! TRAP ERR ! ! ! ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## # # FUNCTION: BACKTRACE # ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~## function backtrace { local _start_from_=0 local params=( "$@" ) if (( "${#params[@]}" >= "1" )) then _start_from_="$1" fi local i=0 local first=false while caller $i > /dev/null do if test -n "$_start_from_" && (( "$i" + 1 >= "$_start_from_" )) then if test "$first" == false then echo "BACKTRACE IS:" first=true fi caller $i fi let "i=i+1" done } return 0

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