#!/bin/bash
#
# Updates all running lxc containers on a proxmox host

PATH="/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin"

prog="$(basename "$0")"

usage() {
	cat >&2 <<-EOF
	usage: $prog [-h] [-e EXCLUDELIST]
	  installs a preconfigured lxc container on your proxmox server
    -e EXCLUDELIST   list of container ids to exclude from backup (separator: |)
    -h               displays this help text
  ---------------------------------------------------------------------------
    (C) 2021         lxc-update by bashclub (https://github.com/bashclub)
  ---------------------------------------------------------------------------
	EOF
	exit $1
}

condition="grep running"

while getopts "hi:s:c:" opt; do
  case $opt in
    h) usage 0 ;;
    e) condition="$condition | grep -vE '$OPTARG'" ;;
    *) usage 1 ;;
  esac
done
shift $((OPTIND-1))

ctlist=$(pct list | $condition | cut -d' ' -f1)

for ct in $ctlist; do
    for vol in $(pct config $ct | grep -E "^rootfs|^mp[0-9]+" | cut -d ' ' -f2 | cut -d',' -f1); do
        snapvols="$snapvols $(pvesm path $vol | cut -d'/' -f2-)";
    done
    zfs-auto-snapshot --quiet --syslog --label=lxc-auto-update --keep=2 --pre-snapshot=$(pct shutdown $ct && while [[ "$(pct status $ct)" == "status: running" ]];do sleep .1; echo "waiting for shutdown of ct $ct"; done) --post-snapshot=$(pct start $ct) $snapvols
    pct exec $ct /usr/bin/apt update
    pct exec $ct -- bash -c "DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical /usr/bin/apt -y -qq dist-upgrade"
    snapvols=
done