Bash strict mode script

error_handling.sh

#!/usr/bin/env bash

 # Proper error handling for bash also known as "Bash Strict Mode"
 # Usage: source 'error_handling.sh'
 # https://gist.github.com/robin-a-meade/58d60124b88b60816e8349d1e3938615
 # https://disconnected.systems/blog/another-bash-strict-mode/

if [ -n "${DEBUG:-}" ]; then
    set -x
fi

set -e -E -o pipefail -u
    # set         => Set or unset shell attributes.
    # -e          => Exit when one of the commands fails.
    # -E          => If set, any trap on ERR is inherited by shell functions, command substitutions, and commands executed in a subshell environment.
    # -o pipefail => the return value of a pipeline is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands in the pipeline exit successfully.
    # -u          => Treat unset variables and parameters as an error.

shopt -s inherit_errexit
    # shopt              => This builtin allows you to change additional shell optional behavior.
    # -s inherit_errexit => If set, command substitution inherits the value of the errexit option, instead of unsetting it in the subshell environment.

error_on_line() {
    local error_code=$?
    echo "$0: Error on line $1: $BASH_COMMAND"
    exit $error_code
}

trap 'error_on_line $LINENO' ERR # For errors print line and command.

export MSYS_NO_PATHCONV=1 # Disable path conversion in git bash.