drop-caches

#!/bin/bash

# SPDX-FileCopyrightText: 2015 - 2024 sudorook <daemon@nullcodon.com>
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.

set -eu

ROOT="$(dirname "${0}")"

source "${ROOT}"/globals

function doas_user_or_root() {
  local cmd
  cmd=("${@}")
  if [ "${EUID}" -eq 0 ]; then
    eval "${cmd[*]}"
  else
    sudo bash -c "${cmd[*]}"
  fi
}

function do_drop_caches() {
  if [ -e /proc/sys/vm/drop_caches ]; then
    doas_user_or_root "echo 3 > drop_caches"
  elif check_command purge && [[ "${OSTYPE}" =~ darwin ]]; then
    doas_user_or_root "purge"
  else
    show_error "ERROR: ${OSTYPE@Q} not suported. Exiting."
    exit 3
  fi
}

sync
do_drop_caches
show_success "Done!"