Arch Linux script to clean system

archclean.sh

PROGARGS="$*"
JTIME="2weeks"

# First AUR helper found in this list will be used
AURHELPERS="yay paru trizen pacaur"

usage() {
    echo "Usage: $(basename $PROG) [options]"
    echo "Clean system and user package caches and prune journal."
    echo "Options:"
    echo " -r (run as root. Do NOT use this, executed only programatically)"
    echo " -a <AUR HELPER>"
    exit 1
}

ROOT=0
AURHELP=""
while getopts ra: c; do
    case $c in
    r) ROOT=1;;
    a) AURHELP=$OPTARG;;
    \?) usage;;
    esac
done

shift $((OPTIND - 1))

if [[ $# -ne 0 ]]; then
    usage
fi

if [[ -n $AURHELP ]]; then
    if ! type $AURHELP &>/dev/null; then
	echo "ERROR: $AURHELP must be installed."
	exit 1
    fi
else
    for h in $AURHELPERS; do
	if type $h &>/dev/null; then
	    AURHELP=$h
	    break
	fi
    done
    if [[ -z $AURHELP ]]; then
	echo "ERROR: None of \"$AURHELPERS\" are installed."
	exit 1
    fi
fi

run_as_user() {
    echo "### Cleaning $AURHELP USER cache of uninstalled AUR packages .."
    $AURHELP -Scq --color=never --noconfirm

    echo "### Removing orphan packages .."
    LIST="$($AURHELP -Qtdq)"
    if [[ -n $LIST ]]; then
	$AURHELP -Rns $LIST --noconfirm
    fi
}

run_as_root() {
    echo "### Cleaning pacman SYSTEM cache of uninstalled packages .."
    paccache -ruk0 --nocolor
    echo

    echo "### Cleaning pacman SYSTEM cache of installed packages .."
    paccache -rk2 --nocolor
    echo

    echo "### Pruning journal to last $JTIME"
    journalctl --vacuum-time=$JTIME
}

if [[ $ROOT -eq 0 ]]; then
    if [[ $(id -u) == 0 ]]; then
	echo "Do not manually run as root." >&2
	exit 1
    fi
    run_as_user
    exec sudo $PROG -r $PROGARGS
else
    if [[ $(id -u) != 0 ]]; then
	echo "Do not manually specify root mode." >&2
	exit 1
    fi

    if [[ -z "$SUDO_USER" ]]; then
	echo "Must run with sudo to identify admin user $AURHELP cache dir." >&2
	exit 1
    fi
    run_as_root
fi