73 lines
1.9 KiB
Bash
73 lines
1.9 KiB
Bash
# ------------------------------------------------------------------------------
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# Display a backtrace
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# ------------------------------------------------------------------------------
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function backtrace ()
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{
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echo "========= Call stack ========="
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typeset -i i=0
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local func=
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for func in "${FUNCNAME[@]}"; do
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if [[ $i -ne 0 ]]; then
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printf '%15s() %s:%d\n' \
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"$func" "${BASH_SOURCE[$i]}" "${BASH_LINENO[ (( $i - 1)) ]}"
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fi
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let i++ || true
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done
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unset func i
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echo "=============================="
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}
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# ------------------------------------------------------------------------------
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# Function to be trapped for errors investigation
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# ------------------------------------------------------------------------------
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function error ()
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{
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local errcode=$?
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backtrace
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return $errcode
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}
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# ------------------------------------------------------------------------------
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# Activate or deactivate error trapping to display backtrace
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# ------------------------------------------------------------------------------
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settrace ()
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{
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local status="off"
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[[ $(trap -p ERR) ]] && status="on"
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#trap -p ERR
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for opt in $@ ; do
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case $opt in
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"-h"|"--help")
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echo "Try to activate backtrace display for script debugging."
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echo
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echo "Options:"
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echo " --on Activate backtrace generation"
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echo " --off Deactivate backtrace generation"
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echo
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echo "That function active a trap event on error. If the script you want to"
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echo "debug overload the ERR bash trap, it will not work."
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echo
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;;
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"--on")
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if [[ $status == "on" ]]; then
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disp W "ERR signal trap is already set, replacing previous trap!"
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fi
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trap "error" ERR
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;;
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"--off")
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if [[ $status != "on" ]]; then
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disp W "ERR signal trap is already unset!"
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fi
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trap - ERR
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;;
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"--status")
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disp "ERR trap signal is ${status}."
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;;
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esac
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done
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unset status
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}
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export -f settrace
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