#!/usr/bin/python3
#
# Copyright 2017 ScyllaDB
#

#
# This file is part of Scylla.
#
# Scylla is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Scylla 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 Scylla.  If not, see <http://www.gnu.org/licenses/>.

import os
import sys
import yaml
import argparse
import subprocess

def find_mount_point(path):
    path = os.path.abspath(path)
    while not os.path.ismount(path):
        path = os.path.dirname(path)
    return path

def main():
    parser = argparse.ArgumentParser(description='Run fstrim on Scylla data partitions.')
    parser.add_argument('-c', '--config', dest='config', action='store',
                        default='/etc/scylla/scylla.yaml',
                        help='path to scylla.yaml')
    args = parser.parse_args()
    s = open(args.config).read()
    cfg = yaml.load(s)
    mountpoints = set()
    for d in cfg['data_file_directories']:
        mountpoints.add(find_mount_point(d))

    mountpoints.add(find_mount_point(cfg['commitlog_directory']))
    # workaround of #2649
    subprocess.call(["/usr/lib/scylla/scylla-blocktune", "--set-nomerges", "1"])
    for d in mountpoints:
        print("Running fstrim on {} ...".format(d))
        res = subprocess.call(["fstrim", d])
        if res != 0:
            print("{} doesn't support TRIM.".format(d))
    subprocess.call(["/usr/lib/scylla/scylla-blocktune", "--set-nomerges", "2"])

if __name__ == "__main__":
    main()
