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#!/usr/bin/python
#
# Copyright (c) 2018 Red Hat, Inc.
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
"""
vdoStats - Report statistics from an Albireo VDO.
$Id: //eng/vdo-releases/magnesium/src/python/vdo/vdoStats#3 $
"""
from __future__ import print_function
import errno
import gettext
import locale
import os
import sys
from optparse import OptionParser
# Temporary patch to address layout changes
for dir in sys.path:
vdoDir = os.path.join(dir, 'vdo')
if os.path.isdir(vdoDir):
sys.path.append(vdoDir)
break
from statistics import *
from utils import Command, CommandError, runCommand
gettext.install('vdo')
parser = OptionParser(usage="%prog [options] [device ...]");
parser.add_option("--all", action="store_true", dest="all",
help=_("Equivalent to --verbose"))
parser.add_option("--human-readable", action="store_true",
dest="humanReadable",
help=_("Display stats in human-readable form"))
parser.add_option("--si", action="store_true", dest="si",
help=_("Use SI units, implies --human-readable"))
parser.add_option("--verbose", action="store_true", dest="verbose",
help=_("Include verbose statistics"))
parser.add_option("--version", action="store_true", dest="version",
help=_("Print the vdostats version number and exit"))
UNITS = [ 'B', 'K', 'M', 'G', 'T' ]
########################################################################
def makeDedupeFormatter(options):
"""
Make the formatter for dedupe stats if needed.
:param options: The command line options
:return: A formatter if needed or None
"""
if not options.verbose:
return None
return StatFormatter([{ 'namer' : '+' },
{ 'indent': ' ', 'namer' : True }],
hierarchical=False)
########################################################################
def enumerateDevices():
"""
Enumerate the list of VDO devices on this host.
:return: A list of VDO device names
"""
names = []
try:
names = [name for name in runCommand(["vdo", "list"]).splitlines()
if len(name) > 0]
paths = [os.path.sep.join(["", "dev", "mapper", name]) for name in names]
names = filter(os.path.exists, paths)
except CommandError as e:
print(_("Error enumerating VDO devices: {0}".format(e)), file = sys.stderr)
return names
########################################################################
def transformDevices(devices):
"""
Iterates over the list of provided devices transforming any standalone device
name or absolute path that represents a resolved vdo device to the name/path
of the vdo device using the vdo name specified at its creation.
Returns a list of sampling dictionaries.
:param devices: A list of devices to sample.
:return: The dictionary list of devices to sample.
"""
paths = enumerateDevices()
names = [os.path.basename(x) for x in paths]
resolvedPaths = [os.path.realpath(x) for x in paths]
resolvedNames = [os.path.basename(x) for x in resolvedPaths]
resolvedToVdoName = dict(zip(resolvedNames, names))
resolvedToVdoPath = dict(zip(resolvedPaths, paths))
transformedDevices = []
for (original, (head, tail)) in [(x, os.path.split(x)) for x in devices]:
if tail in names:
transformedDevices.append(Samples.samplingDevice(original, original))
continue
if tail in resolvedNames:
if head == '':
transformedDevices.append(
Samples.samplingDevice(original, resolvedToVdoName[tail]))
continue
if os.path.isabs(original) and (original in resolvedPaths):
transformedDevices.append(
Samples.samplingDevice(original, resolvedToVdoPath[original]))
continue
transformedDevices.append(Samples.samplingDevice(original, original))
return transformedDevices
########################################################################
def getDeviceStats(devices, assays):
"""
Get the statistics for a given device.
:param devices: A list of devices to sample. If empty, all VDOs will
be sampled.
:param assays: The types of samples to take for each device
:return: A tuple whose first entry is the Samples and whose second entry
is the exit status to use if no subsequent error occurs.
"""
exitStatus = 0
if not devices:
mustBeVDO = False
devices = [Samples.samplingDevice(x, x) for x in enumerateDevices()]
else:
mustBeVDO = True
# Get the device dictionary containing transformations of references to a
# vdo device's resolved name/path to references to its symbolic name/path.
devices = transformDevices(devices)
# Filter out any specified devices that do not exist.
#
# Any specified device that passes os.path.exists is passed through.
# If it fails os.path.exists and is not a full path it is checked
# against being an entry in either /dev/mapper or /proc/vdo.
# If either of those exists the original device is passed through
# unchanged.
existingDevices = []
for device in devices:
user = device["user"]
sample = device["sample"]
if os.path.exists(sample):
existingDevices.append(device)
else:
exists = False
if (not os.path.isabs(sample)):
exists = os.path.exists(os.path.sep.join(["", "dev", "mapper",
sample]))
if (not exists):
sample = os.path.sep.join(["", "proc", "vdo", sample])
if ((not exists) and (not os.path.exists(sample))):
print("'{0}': {1}".format(user, os.strerror(errno.ENOENT)),
file = sys.stderr)
exitStatus = 1
else:
existingDevices.append(device)
devices = existingDevices
if len(devices) > 0:
return (Samples.assayDevices(assays, devices, mustBeVDO), exitStatus)
return (None, exitStatus)
########################################################################
def formatSize(size, options):
"""
Format a size (in KB) for printing.
:param size: The size in bytes.
:param options: The command line options
:return: The size formatted for printing based on the options
"""
if isinstance(size, NotAvailable):
return size
if not options.humanReadable:
return size
size *= 1024
divisor = 1000.0 if options.si else 1024.0
unit = 0
while ((size >= divisor) and (unit < (len(UNITS) - 1))):
size /= divisor
unit += 1
return "{0:>.1f}{1}".format(size, UNITS[unit])
########################################################################
def formatPercent(value):
"""
Format a percentage for printing.
:param value: The value to format
:return: The formatted value
"""
return value if isinstance(value, NotAvailable) else "{0}%".format(value)
########################################################################
def dfStats(sample, options):
"""
Extract the values needed for df-style output from a sample.
:param sample: The sample from which to extract df values
:param options: The command line options
"""
return ([formatSize(sample.getStat(statName), options)
for statName in
["oneKBlocks", "oneKBlocksUsed", "oneKBlocksAvailable"]]
+ [formatPercent(sample.getStat(statName))
for statName in ["usedPercent", "savingPercent"]])
########################################################################
def printDF(stats, options):
"""
Print stats in df-style.
:param stats: A list of samples, one for each device sampled
:param options: The command line options
"""
dfFormat = "{0:<20} {1:>9} {2:>9} {3:>9} {4:>4} {5:>13}"
print(dfFormat.format("Device",
"Size" if options.humanReadable else "1K-blocks",
"Used", "Available", "Use%", "Space saving%"))
for stat in stats:
print(apply(dfFormat.format,
[stat.getDevice()] + dfStats(stat.getSamples()[0], options)))
########################################################################
def printYAML(stats, dedupeFormatter):
"""
Print stats as (pseudo) YAML.
:param stats: A list of Samples, one for each device sampled
:param dedupeFormatter: The formatter for dedupe stats (may be None)
"""
for stat in stats:
samples = stat.getSamples()
if dedupeFormatter:
dedupeFormatter.output(LabeledValue.make(stat.getDevice(),
[s.labeled() for s in samples]))
########################################################################
def main():
try:
locale.setlocale(locale.LC_ALL, '')
except locale.Error:
pass
(options, devices) = parser.parse_args()
if options.version:
print("{0}.{1}".format(CURRENT_RELEASE_VERSION_NUMBER,
VDOStatistics.statisticsVersion))
sys.exit(0)
if options.all:
options.verbose = True
if options.si:
options.humanReadable = True
dedupeFormatter = makeDedupeFormatter(options)
if options.verbose:
statsTypes = [VDOStatistics(), KernelStatistics()]
else:
statsTypes = [VDOStatistics()]
exitStatus = 0
try:
(stats, exitStatus) = getDeviceStats(devices, statsTypes)
if not stats:
return exitStatus
except Exception as e:
print(e, file = sys.stderr)
return 1
if options.verbose:
printYAML(stats, dedupeFormatter)
else:
printDF(stats, options)
return exitStatus
########################################################################
if __name__ == "__main__":
sys.exit(main())