#!/usr/bin/env bash
#
# kick-mbp-networking
#
# This script is Apache 2.0 licensed.
#
# Networking on proxmox on my 2019 MacBook Pro stubbornly fails to come up
# during boot, but a systemctl networking restart will fix it.
#
# Stick this into root's crontab as a @reboot item and it will fix the
# damned networking
#
# The entry should look like:
# m h  dom mon dow  command
#@reboot /usr/local/sbin/kick-mbp-networking
#
# Copyright 2025, Joe Block <jpb@unixorn.net>

set -o pipefail
if [[ -n "$DEBUG" ]]; then
  # shellcheck disable=SC2086
  if [[ "$(echo $DEBUG | tr '[:upper:]' '[:lower:]')" == "verbose" ]]; then
    set -x
  fi
fi

function debug() {
  if [[ -n "$DEBUG" ]]; then
    echo "$@"
  fi
}

function echo-stderr() {
  echo "$@" 1>&2  ## Send message to stderr.
}

function fail() {
  printf '%s\n' "$1" >&2  ## Send message to stderr. Exclude >&2 if you don't want it that way.
  exit "${2-1}"  ## Return a code specified by $2 or 1 by default.
}

function has() {
  # Check if a command is in $PATH
  which "$@" > /dev/null 2>&1
}

function get-settings() {
  LOG_F=${LOG_F:-'/root/mbp-network-weirdness.log'}
}

function check-dependencies() {
  # Confirm the stuff we need is in $PATH
  debug "Checking dependencies..."
  # shellcheck disable=SC2041
  for p in 'ip' 'systemctl'
  do
    if ! has $p; then
      fail "Can't find $p in your $PATH"
    else
      debug "- Found $p"
    fi
  done
}

function path-exists() {
  local file="${1}"
  [[ -s "${file}" ]] || fail "$1 is not valid"
  [[ -d "${file}" ]] && return
  [[ -f "${file}" ]] && return
  fail "$1 is not a directory or file"
}

function restart-networking-if-down() {
  debug "$LOG_F"
  # Check if the vmbr interface is present
  if [[ $(ip link show | grep -c vmbr) != 0 ]]; then
    debug "ip link show = $(ip link show)" | tee -a "$LOG_F"
    debug "Networking is up" | tee -a "$LOG_F"
  else
    debug "Networking was down after boot, restarting at $(date)" | tee -a "$LOG_F"
    echo "Restarting networking after failed to start during boot at $(date)" | tee -a "$LOG_F"
    time systemctl restart networking | tee -a "$LOG_F"
  fi
}

check-dependencies
get-settings
restart-networking-if-down