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# Copyright (c) 2013 dotCloud, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
def statvfs():
docker_path = '/var/lib/docker'
if not os.path.exists(docker_path):
docker_path = '/'
return os.statvfs(docker_path)
def get_meminfo():
with open('/proc/meminfo') as f:
return f.readlines()
def get_disk_usage():
# This is the location where Docker stores its containers. It's currently
# hardcoded in Docker so it's not configurable yet.
st = statvfs()
return {
'total': st.f_blocks * st.f_frsize,
'available': st.f_bavail * st.f_frsize,
'used': (st.f_blocks - st.f_bfree) * st.f_frsize
}
def parse_meminfo():
meminfo = {}
for ln in get_meminfo():
parts = ln.split(':')
if len(parts) < 2:
continue
key = parts[0].lower()
value = parts[1].strip()
parts = value.split(' ')
value = parts[0]
if not value.isdigit():
continue
value = int(parts[0])
if len(parts) > 1 and parts[1] == 'kB':
value *= 1024
meminfo[key] = value
return meminfo
def get_memory_usage():
meminfo = parse_meminfo()
total = meminfo.get('memtotal', 0)
free = meminfo.get('memfree', 0)
free += meminfo.get('cached', 0)
free += meminfo.get('buffers', 0)
return {
'total': total,
'free': free,
'used': total - free
}
def get_mounts():
with open('/proc/mounts') as f:
return f.readlines()
def get_cgroup_devices_path():
for ln in get_mounts():
fields = ln.split(' ')
if fields[2] == 'cgroup' and 'devices' in fields[3].split(','):
return fields[1]
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