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#!/bin/bash
# Copyright 2018 Ian Kelling
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Commentary: Bash stack trace and error handling functions. This file
# is meant to be sourced. It loads some functions which you may want to
# call manually (see the comments at the start of each one), and then
# runs err-catch. See the README file for a slightly longer explanation.
err-allow() {
# help: turn off exit and stack trace on error. undoes err-catch
set +E +o pipefail; trap ERR
}
err-bash-trace() {
# help: print stack trace
#
# Note: It does not show function args unless you first run:
# shopt -s extdebug
# err-catch runs this for you.
local -i argc_index=0 frame i start=${1:-1} max_indent=8 indent
local source
local extdebug=false
if [[ $(shopt -p extdebug) == *-s* ]]; then
extdebug=true
fi
for ((frame=0; frame < ${#FUNCNAME[@]}-1; frame++)); do
argc=${BASH_ARGC[frame]}
argc_index+=$argc
((frame < start)) && continue
if (( ${#BASH_SOURCE[@]} > 1 )); then
source="${BASH_SOURCE[frame+1]}:${BASH_LINENO[frame]}:"
fi
indent=$((frame-start+1))
indent=$((indent < max_indent ? indent : max_indent))
printf "%${indent}s↳%sin \`%s" '' "$source" "${FUNCNAME[frame]}"
if $extdebug; then
for ((i=argc_index-1; i >= argc_index-argc; i--)); do
printf " %s" "${BASH_ARGV[i]}"
done
fi
echo \'
done
}
err-catch() {
# help: on errors: print stack trace and exit
#
# You can set "${_errcatch_cleanup[@]}" to a command and it will run before exiting.
# This function depends on err-bash-trace.
set -E; shopt -s extdebug
_err-trap() {
err=$?
exec >&2
set +x
echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}:in \`$BASH_COMMAND' returned $err"
# err trap does not work within an error trap, the following line:
err-bash-trace 2; set -e
"${_errcatch_cleanup[@]:-:}" # note :-: is to be compatible with set -u
echo "$0: exiting with code $err"
exit $err
}
trap _err-trap ERR
set -o pipefail
}
err-exit() {
# usage: err-exit [EXIT_CODE] [MESSAGE]
# help: exit and print stack trace.
#
# Use this instead of the exit command to be more informative. default
# EXIT_CODE is 1. If only one of EXIT_CODE and MESSAGE is given,
# we consider it to be an exit code if it is a number.
# This function depends on err-bash-trace.
exec >&2
code=1
if [[ "$*" ]]; then
if [[ ${1/[^0-9]/} == "$1" ]]; then
code=$1
if [[ $2 ]]; then
printf '%s\n' "$2"
fi
else
printf '%s\n' "$0: $1"
fi
fi
echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}"
err-bash-trace 2
echo "$0: exiting with code $code"
exit $err
}
err-catch
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