#!/bin/sh
# Steward host agent: the packages the agent's helper uses, installed with
# whichever package manager the host has (#5789). Served by Steward at
# /plugins/host_agent/files/install-deps.sh and run, as root, by install.sh
# and the host_agent playbooks: one copy of the list.
#
# smartmontools gives the helper smartctl, which reads each drive's health.
# On pacman hosts, pacman-contrib gives the agent checkupdates, the one safe
# way to see pending updates without root (#5803).
# A package that can't be installed is reported, never fatal: the agent runs
# without it and the host page says what is missing.
#
# Recommended / weak dependencies are skipped: on Debian, smartmontools
# recommends a mail server.


have() { command -v "$1" >/dev/null 2>&1; }

install_with() {
    if have apt-get; then
        export DEBIAN_FRONTEND=noninteractive
        # A stale package list can't find the package: refresh once and retry.
        apt-get install -y --no-install-recommends "$@" \
            || { apt-get update && apt-get install -y --no-install-recommends "$@"; }
    elif have dnf; then
        dnf -y install --setopt=install_weak_deps=False "$@"
    elif have yum; then
        yum -y install "$@"
    elif have zypper; then
        zypper --non-interactive install --no-recommends "$@"
    elif have pacman; then
        pacman -S --needed --noconfirm "$@"
    elif have apk; then
        apk add --no-cache "$@"
    else
        echo "no package manager this script knows (apt, dnf, yum, zypper, pacman, apk)"
        return 1
    fi
}

missing=""
have smartctl || missing="$missing smartmontools"
if have pacman && ! have checkupdates; then
    missing="$missing pacman-contrib"
fi
[ -n "$missing" ] || { echo "dependencies present"; exit 0; }

# shellcheck disable=SC2086  # one word per package
if install_with $missing; then
    echo "installed:$missing"
else
    echo "WARNING: could not install$missing; until it is, drive health reads \"smartctl not installed\" (smartmontools) and the update check reads \"checkupdates isn't installed\" (pacman-contrib)"
fi
exit 0