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#!/usr/bin/python3
#
# Copyright (C) 2016 Hans van Kranenburg <hans@knorrie.org>
#
# This file is part of python-btrfs.
#
# python-btrfs is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# python-btrfs 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with python-btrfs. If not, see <http://www.gnu.org/licenses/>.
import argparse
import btrfs
import os
import sys
STATE_OK = 0
STATE_WARNING = 1
STATE_CRITICAL = 2
STATE_UNKNOWN = 3
state_str_map = {
STATE_OK: 'OK',
STATE_WARNING: 'WARNING',
STATE_CRITICAL: 'CRITICAL',
STATE_UNKNOWN: 'UNKNOWN',
}
def get_args():
parser = argparse.ArgumentParser("Check BTRFS filesystem usage")
parser.add_argument('-awg', '--allocated-warning-gib', type=int, default=0,
help="Exit with WARNING status if less than the specified amount of "
"disk space (in GiB) is unallocated")
parser.add_argument('-acg', '--allocated-critical-gib', type=int, default=0,
help="Exit with CRITICAL status if less than the specified amount of "
"disk space (in GiB) is unallocated")
parser.add_argument('-awp', '--allocated-warning-percent', type=int, default=100,
help="Exit with WARNING status if more than the specified percent of "
"disk space is allocated")
parser.add_argument('-acp', '--allocated-critical-percent', type=int, default=100,
help="Exit with CRITICAL status if more than the specified percent of "
"disk space is allocated")
parser.add_argument('-m', '--mountpoint', required=True,
help="Path to the BTRFS mountpoint")
args = parser.parse_args()
if not os.path.exists(args.mountpoint):
print("BTRFS mountpoint does not exist: {}".format(args.mountpoint))
return STATE_CRITICAL, args
if not os.access(args.mountpoint, os.R_OK):
print("Mountpoint is not accessible: {}".format(args.mountpoint))
return STATE_CRITICAL, args
if args.allocated_warning_gib < 0:
print("Allocated GiB warning threshold must be a positive integer value: {}".format(
args.allocated_warning_gib))
return STATE_CRITICAL, args
if args.allocated_critical_gib < 0:
print("Allocated GiB critical threshold must be a positive integer value: {}".format(
args.allocated_critical_gib))
return STATE_CRITICAL, args
if args.allocated_warning_percent < 0 or args.allocated_warning_percent > 100:
print("Allocated warning percentage must be between 0 and 100: {}".format(
args.allocated_warning_percent))
return STATE_CRITICAL, args
if args.allocated_critical_percent < 0 or args.allocated_critical_percent > 100:
print("Allocated critical percentage must be between 0 and 100: {}".format(
args.allocated_critical_percent))
return STATE_CRITICAL, args
return STATE_OK, args
def check_usage(args, fs):
warning = False
critical = False
msg = []
GiB = btrfs.utils.SZ_1G
bups = btrfs.utils.pretty_size
usage = fs.usage()
mixed_groups = fs.mixed_groups()
if not mixed_groups:
# Keep it a bit simple and only report remaining free space for data
unused_left = usage.free_data
else:
unused_left = usage.free_mixed
# Allocations are always in the physical address space.
# Usage is always in virtual address space.
if usage.allocatable_left < args.allocated_critical_gib * GiB:
msg.append("Critical: Unallocated left: {} (Unused left: {})".format(
bups(usage.allocatable_left), bups(unused_left)))
critical = True
elif usage.allocatable_left < args.allocated_warning_gib * GiB:
msg.append("Warning: Unallocated left: {} (Unused left: {})".format(
bups(usage.allocatable_left), bups(unused_left)))
warning = True
allocated_pct = int(round((usage.allocated * 100) / usage.allocatable))
# Again, be conservative, and only use remaining data space.
used_pct = int(round((usage.virtual_used * 100) /
(usage.virtual_used + usage.free_data)))
if allocated_pct >= args.allocated_critical_percent:
msg.append("Critical: Allocated: {}% (Used: {}%)".format(allocated_pct, used_pct))
critical = True
elif allocated_pct >= args.allocated_warning_percent:
msg.append("Warning: Allocated: {}% (Used: {}%)".format(allocated_pct, used_pct))
warning = True
summary = []
summary.append("Physical size: {}".format(bups(usage.total)))
summary.append("Allocatable: {}".format(bups(usage.allocatable)))
summary.append("Allocated: {} ({}%)".format(bups(usage.allocated), allocated_pct))
summary.append("Unallocatable: {} (Reclaimable: {})".format(
bups(usage.unallocatable_soft), bups(usage.unallocatable_reclaimable)))
summary.append("Virtual used: {} ({}%)".format(bups(usage.virtual_used), used_pct))
if critical:
return STATE_CRITICAL, msg, summary
if warning:
return STATE_WARNING, msg, summary
return STATE_OK, msg, summary
def check_dev_stats(fs):
state = STATE_OK
msg = []
summary = []
devices = list(fs.devices())
for device in devices:
stats = fs.dev_stats(device.devid)
device_msg = ["{}: {}".format(counter, value)
for counter, value in stats.counters.items()
if value != 0]
if len(device_msg) > 0:
msg.append("Device {}: {}".format(device.devid, ", ".join(device_msg)))
state = STATE_CRITICAL
summary.append("{} device(s)".format(len(devices)))
if state != STATE_OK:
return state, msg, summary
return state, msg, summary
def main():
args_state, args = get_args()
if args_state != STATE_OK:
return args_state
with btrfs.FileSystem(args.mountpoint) as fs:
state = STATE_OK
msg = []
summary = []
usage_state, usage_msg, usage_summary = check_usage(args, fs)
state = max(state, usage_state)
msg.extend(usage_msg)
summary.extend(usage_summary)
dev_stats_state, dev_stats_msg, dev_stats_summary = check_dev_stats(fs)
state = max(state, dev_stats_state)
msg.extend(dev_stats_msg)
summary.extend(dev_stats_summary)
if len(msg) > 0:
print("BTRFS {}: ".format(state_str_map[state]), end='')
print(", ".join(msg))
else:
print("BTRFS OK")
print(", ".join(summary))
return state
if __name__ == "__main__":
sys.exit(main())
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