segfault/provision/system/funcs

#! /usr/bin/env bash

# shellcheck disable=SC2034 # unused variable warning for ansi colors

CY="\e[1;33m" # yellow
CG="\e[1;32m" # green
CR="\e[1;31m" # red
CC="\e[1;36m" # cyan
CM="\e[1;35m" # magenta
CW="\e[1;37m" # magenta
CF="\e[2m"    # faint
CN="\e[0m"    # none

CBG="\e[42;1m" # Background Green

# night-mode
CDY="\e[0;33m" # yellow
CDG="\e[0;32m" # green
CDR="\e[0;31m" # red
CDC="\e[0;36m" # cyan
CDM="\e[0;35m" # magenta

# Clear from cursor to end of line
CL="\e[0K"

if [[ -z $SF_DEBUG ]]; then
	DEBUGF(){ :;}
	DEBUGF_R(){ :;}
else
	DEBUGF(){ echo -e "${CY}DEBUG:${CN} $*";}
	DEBUGF_R(){ echo -e "${CY}DEBUG:${CN} ${CR}$*${CN}";}
fi

ERREXIT()
{
	local code
	code="$1"
	# shellcheck disable=SC2181 #(style): Check exit code directly with e.g
	[[ $? -ne 0 ]] && code="$?"
	[[ -z $code ]] && code=99

	shift 1
	[[ -n $1 ]] && echo -e >&2 "${CR}ERROR:${CN} $*"

	exit "$code"
}

WARN()
{
	local code
	code="$1"
	[[ -z $code ]] && code=255

	shift 1
	echo -e >&2 "${CY}WARNING(${code}):${CN} $*"
}

INFO()
{
	echo -e >&2 "--> ${CM}$*${CN}"
}


NEED_ROOT()
{
	[[ "$(id -u)" -ne 0 ]] && ERREXIT 255 "Error: Run this scrpt as root"
}

IS_APT_INSTALLED()
{
	[[ "$(apt -qq list "$*" 2>/dev/null)" = *"[installed]" ]] && return 0 || return 1
}

MD5F ()
{
    local f;
    local res;
    f="$1";
    [[ ! -f "$f" ]] && return;
    res=$(md5sum "$f");
    echo "${res%% *}"
}

# Load .env file into bash variables.
# .env variables are not quotes. Thus we can not use 'source .env'
# in case a variable value contains a whitespace. (dare you, team docker!).
# Instead load & parse them one by one and run through eval to set CFG_
ENV_LOAD()
{
	local file
	local old_ifs
	local arr
	local mode
	file="$1"
	mode="${2,,}"
	old_ifs="$IFS"

	[[ ! -f "$file" ]] && return 255

	IFS=$'\n'
	arr=($(<"${file}"))

	local i
	local name
	local val
	i=0
	# Note '.env' values are not 'quoted' but bash need them quoted "strings".
	while [[ $i -lt ${#arr[@]} ]]; do
		str=${arr[$i]}
		((i++))
		[[ "${str:0:3}" != 'SF_' ]] && continue
		name="${str%%=*}"
		[[ $mode == "add" ]] && {
			eval '[[ -n $'"$name"' ]]' && continue
		}
		val="${str#*=}"
		# Escape ' with '"'"'
		val=${val//\'/\'\"\'\"\'}
		eval "$name"=\'${val}\'
	done

	IFS="$old_ifs"
}