unixorn/tumult.plugin.zsh

#!/usr/bin/env bash
#
# Set interval between software update checks
#
# Copyright 2023, Joe Block <jpb@unixorn.net>

DEFAULT_UPDATE_INTERVAL=7

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 check-dependencies() {
  debug "Checking dependencies..."
  for p in 'defaults'
  do
    if ! has $p; then
      fail "Can't find $p in your $PATH"
    else
      debug "- Found $p"
    fi
  done
}

function my-name() {
  echo $(basename "$0")
}

function usage() {
  echo "Usage: $(my-name) INTEGER_DAYS"
  echo
  echo "If days are not specified, $(my-name) will reset the check interval to ${DEFAULT_UPDATE_INTERVAL}"
}

if [[ "$(uname -s)" != 'Darwin' ]]; then
  fail 'Sorry, this script only works on macOS'
fi

check-dependencies

if [[ $# != 1 ]]; then
  echo-stderr "Days unspecified or improperly specified"
  INTERVAL=$DEFAULT_UPDATE_INTERVAL
else
  # Confirm it's a number
  if [[ $1 =~ ^[0-9]+$ ]]; then
    INTERVAL=$1
  else
    echo "You specified ${1} - it is not a number, using default of ${DEFAULT_UPDATE_INTERVAL}"
    INTERVAL="$DEFAULT_UPDATE_INTERVAL"
  fi
fi

echo "Setting software update check interval to $INTERVAL days"
exec defaults write com.apple.SoftwareUpdate ScheduleFrequency -int "$INTERVAL"