Error handling in bash with sentry support

error_handling.sh

#!/usr/bin/env bash

set -eTEuo pipefail

function get_pgid() {
    cut -d " " -f 5 < "/proc/$$/stat" | tr ' ' '\n'
}

pgid="$(get_pgid)"
if [[ "$$" != "$pgid" ]]; then
    exec setsid "$(readlink -f "$0")" "$@"
fi

SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]:-.}" )" &> /dev/null && pwd )"
function stacktrace() {
    cd "$SCRIPT_DIR"
    local i=1 line file func
    while read -r line func file < <(caller "$i"); do
        echo "[$i] $file:$line $func(): $(sed -n "$line"p "$file")" 1>&2
        i=$((i+1))
    done
}

trap 'set +x; end 1' SIGUSR1 SIGTERM
trap 'set +x; end' EXIT
trap 'set +x; catch_err $?' ERR

function catch_err() {
    stacktrace_msg="$(stacktrace 2>&1)"
    send_sentry "$1" "$stacktrace_msg"
    1>&2 echo -e "$stacktrace_msg"

    if [[ "$$" == "$BASHPID" ]]; then
        end 1
    else
        PGID="$(get_pgid)"
        kill -10 -- "$PGID"
        sleep 1
        kill -15 -- -"$PGID"
    fi
}

function cleanup() {
    rm -rf "${TMP_FILE:-}" || true  # FIXME
}

function end() {
    local return_code="${1:-}"
    trap '' EXIT
    set +e  # At this point, if things fail, we can't do much more
    [[ -z "$(jobs -p)" ]] || kill "$(jobs -p)" 2> /dev/null
    if [[ "$$" == "$BASHPID" ]]; then
        cleanup
    fi
    [[ -z "$return_code" ]] || exit "$return_code"
}


function send_sentry() {
    # Don't do anything if sentry-cli command doesn't exist
    if ! command -v sentry-cli &> /dev/null; then
        return
    fi

    local return_code="$1"
    local stacktrace_msg="$2"
    cd "$SCRIPT_DIR"
    local line file func
    read -r line func file < <(caller 1)
    error_line="$(sed -n "$line"p "$file" | awk '{$1=$1};1')"
    sentry-cli send-event -m "$error_line: return code $return_code" \
        -a "$stacktrace_msg" \
        -t user_sudo:"${SUDO_USER:-${USER:-undefined}}" || echo Could not send sentry event 1>&2
}