#!/bin/bash
# Init: initialise a computer and conform it
# Copyright (c) 2021 Geoffray Levasseur <geoffray.levasseur@obs-mip.fr>

# trace ERR through pipes
set -o pipefail

# trace ERR through 'time command' and other functions
set -o errtrace

# set -e : exit the script if any statement returns a non-true return value
set -o errexit

# set +u : allow undeclared variables
set +o nounset

# We want english messages
export LC_ALL=C
export LANG=C

# Version of init
export VERSION="0.95.2"

# Store script's path
export MYPATH=$(dirname $0)

# Get hostname
export HOSTNAME=$(hostname)

# Load libraries
for lib in $MYPATH/lib/*.sh; do
    . $lib
done

# =============================
# ==== Basic sanity checks ====
# =============================

# Check if a function exists
function_exists() {
    declare -f -F $1 > /dev/null
    return $?
}

function_exists prnt || (
    echo "*** ERREUR FATALE !"
    echo "*** Il manque des fonctions vitales venant des bibliothèques."
    exit 3
)

# ======================
# ==== Main Program ====
# ======================

# Initializing global variables
export CHECK_ONLY=false
export JUMP=false
export KEEPGOING=false
export RESUME=false
export STAGE_FILE="$MYPATH/stage"

read_commandline

# After this we need to be root
# (--help and --version are allowed as unprivileged user)
check_root

# Logfile variable treatment -- cannot be a function
export LOGFILE=${LOGFILE:-"$MYPATH/log/init-$(uname -n)-$(stdtime).log"}

prnt I "Création du répertoire d'accueil du fichier log..."
[[ ! -d $(dirname $LOGFILE) ]] && mkdir -pv $(dirname $LOGFILE)

# Log all outputs to the logfile
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec >  >(tee -a $LOGFILE)
exec 2> >(tee -a $LOGFILE >&2)
prnt I "Démarrage d'init version $VERSION."

# -- Cannot be a function ends here

load_configuration

process_commandline_and_vars

# Run prechecks
[[ JUMP != true ]] && for mod in $MODULE_LIST; do
    . modules/$mod.sh
    version=VER_$mod
    prnt I "Vérification initiale pour $mod version ${!version}..."
    precheck_$mod
done

# If we only checks, we stop here
if [[ $CHECK_ONLY == true ]]; then
    prnt I "Mode de vérification seulement, on s'arrête là."
    exit 0
fi

# We launch modules one after one
for mod in $MODULE_LIST; do
    : # do everything
done


prnt I  "That's all folks !"