Package ganeti :: Package utils

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Package utils

source code

Ganeti utility module.

This module holds functions that can be used in both daemons (all) and the command line scripts.

Submodules

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ganeti.utils.algo: Utility functions with algorithms.
ganeti.utils.bitarrays: Utility functions for managing bitarrays.
ganeti.utils.filelock: Utility functions for file-based locks.
ganeti.utils.hash: Utility functions for hashing.
ganeti.utils.io: Utility functions for I/O.
ganeti.utils.livelock: Lockfiles to prove liveliness
ganeti.utils.log: Utility functions for logging.
ganeti.utils.lvm: Utility functions for LVM.
ganeti.utils.mlock: Wrapper around mlockall(2).
ganeti.utils.nodesetup: Utility functions for manipulating /etc/hosts.
ganeti.utils.process: Utility functions for processes.
ganeti.utils.retry: Utility functions for retrying function calls with a timeout.
ganeti.utils.security: Utility functions for security features of Ganeti.
ganeti.utils.storage: Utility functions for storage.
ganeti.utils.tags: Utility functions for tag related operations
ganeti.utils.text: Utility functions for manipulating or working with text.
ganeti.utils.version: Version utilities.
ganeti.utils.wrapper: Utility functions wrapping other functions.
ganeti.utils.x509: Utility functions for X509.

Classes

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FdConditionWaiterHelper
Retry helper for WaitForFdCondition.

SignalWakeupFd

SignalHandler
Generic signal handler class.

FieldSet
A simple field set.

Functions

[hide private]

ForceDictType(target, key_types, allowed_values=None)
Force the values of a dict to have certain types.

source code

ValidateServiceName(name)
Validate the given service name.

source code

_ComputeMissingKeys(key_path, options, defaults)
Helper functions to compute which keys a invalid.

source code

VerifyDictOptions(options, defaults)
Verify a dict has only keys set which also are in the defaults dict.

source code

dict

ListVolumeGroups()
List volume groups and their size

source code

boolean

BridgeExists(bridge)
Check whether the given bridge exists in the system

source code

TryConvert(fn, val)
Try to convert a value ignoring errors.

source code

list of int

ParseCpuMask(cpu_mask)
Parse a CPU mask definition and return the list of CPU IDs.

source code

list of lists of int

ParseMultiCpuMask(cpu_mask)
Parse a multiple CPU mask definition and return the list of CPU IDs.

source code

GetHomeDir(user, default=None)
Try to get the homedir of the given user.

source code

int

FirstFree(seq, base=0)
Returns the first non-existing integer from seq.

source code

int or None

SingleWaitForFdCondition(fdobj, event, timeout)
Waits for a condition to occur on the socket.

source code

int or None

WaitForFdCondition(fdobj, event, timeout)
Waits for a condition to occur on the socket.

source code

bool

EnsureDaemon(name)
Check for and start daemon if not alive.

source code

bool

StopDaemon(name)
Stop daemon

source code

SplitTime(value)
Splits time as floating point number into a tuple.

source code

MergeTime(timetuple)
Merges a tuple into time as a floating point number.

source code

EpochNano()
Return the current timestamp expressed as number of nanoseconds since the unix epoch

source code

tuple; (value in dictionary, matched groups as list)

FindMatch(data, name)
Tries to find an item in a dictionary matching a name.

source code

list of tuples

GetMounts(filename=constants.PROC_MOUNTS)
Returns the list of mounted filesystems.

source code

SignalHandled(signums)
Signal Handled decoration.

source code

TimeoutExpired(epoch, timeout, _time_fn=time.time)
Checks whether a timeout has expired.

source code

ValidateDeviceNames(kind, container)
Validate instance device names.

source code

bool

AllDiskOfType(disks_info, dev_types)
Checks if the instance has only disks of any of the dev_types.

source code

bool

AnyDiskOfType(disks_info, dev_types)
Checks if the instance has some disks of any types in dev_types.

source code

GetDiskTemplateString(disk_types)
Gives a summary disk template from disk devtypes.

source code

GetDiskTemplate(disks_info)
Gives a summary disk template from disks.

source code

Variables

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_VALID_SERVICE_NAME_RE = re.compile("^[-_.a-zA-Z0-9]{1,128}$")

UUID_RE = re.compile(constants.UUID_REGEX)

Imports: JoinDisjointDicts, UniqueSequence, FindDuplicates, text, SequenceToDict, RunningTimeout, FlatToDict, itertools, NiceSortKey, GetRepeatedKeys, InvertDict, InsertAtPos, FileLock, retry, LockFile, FingerprintFiles, Sha1Hmac, VerifySha1Hmac, hmac, NewUUID, ErrnoOrStr, WritePidFile, KP_NEVER, RemoveDir, FileStatHelper, shutil, VerifyFileID, BytesToMebibyte, ListVisibleFiles, TailFile, IsNormAbsPath, grp, SafeWriteFile, IsBelowDir, RemoveFile, CreateBackup, GetFileID, RenameFile, GetFilesystemStats, CanRead, FindFile, Makedirs, KP_IF_EXISTS, stat, CalculateDirectorySize, PathJoin, URL_RE, ReadFile, pwd, ReadOneLineFile, EnsureDirs, KEEP_PERMS_VALUES, ReadPidFile, ReadWatcherPauseFile, KP_ALWAYS, filelock, MakeDirWithPerm, IsUserInGroup, TemporaryFileManager, WriteFile, TimestampForFilename, DaemonPidFileName, IsUrl, EnforcePermission, ReadLockedPidFile, struct, NiceSort, LiveLock, LiveLockName, GuessLockfileFor, SetupToolLogging, SetupLogging, CheckVolumeGroupSize, LvmExclusiveTestBadPvSizes, LvmExclusiveCheckNodePvs, ctypes, Mlockall, RemoveEtcHostsEntry, AddHostToEtcHosts, SetEtcHostsEntry, RemoveHostFromEtcHosts, algo, GetProcCmdline, WriteErrorToFD, CloseFDs, RunCmd, utils_algo, SetupDaemonFDs, DisableFork, IsDaemonAlive, StartDaemon, SetupDaemonEnv, KillProcess, RunResult, utils_wrapper, RunInSeparateProcess, IsProcessHandlingSignal, IsProcessAlive, utils_retry, Daemonize, RunParts, resource, subprocess, StringIO, signal, SimpleRetry, RetryAgain, RETRY_REMAINING_TIME, CountRetry, Retry, RetryByNumberOfTimes, RetryTimeout, VerifyCertificate, x509, IsCertificateSelfSigned, uuid_module, UuidToInt, GetCertificateDigest, io, GenerateNewClientSslCert, GenerateNewSslCert, LookupSpaceInfoByDiskTemplate, utils_process, osminor, IsFileStorageEnabled, LookupSpaceInfoByStorageType, GetDiskLabels, ReleaseBdevPartitionMapping, CreateBdevPartitionMapping, IsSharedFileStorageEnabled, GetDiskTemplatesOfStorageTypes, DiskTemplateSupportsSpaceReporting, IsDiskTemplateEnabled, GetStorageUnits, IsLvmEnabled, LvmGetsEnabled, IsGoodTag, GetExclusionPrefixes, GenerateSecret, DnsNameGlobPattern, EscapeAndJoin, ShellWriter, FormatOrdinal, IsValidShellParam, compat, UnescapeAndSplit, Truncate, FilterEmptyLinesAndComments, FormatKeyValue, MatchNameComponent, LineSplitter, collections, BuildShellCmd, NormalizeAndValidateThreeOctetMacPrefix, SafeEncode, ShellQuoteArgs, ParseUnit, FormatUnit, ShellQuote, FormatTime, NormalizeAndValidateMac, CommaJoin, ShellCombineCommands, FormatSeconds, fcntl, IsExecutable, socket, IgnoreSignals, tempfile, ResetTempfileModule, SetNonblockFlag, sys, SetCloseOnExecFlag, RetryOnSignal, GetClosedTempfile, TestDelay, IgnoreProcessNotFound, os, select, CloseFdNoError, SplitVersion, IsCorrectConfigVersion, ParseVersion, BuildVersion, UpgradeRange, IsEqual, FIRST_UPGRADE_VERSION, ShouldCfgdowngrade, IsBefore, CURRENT_VERSION, datetime, LoadSignedX509Certificate, calendar, X509_SIGNATURE, ExtractX509Certificate, errno, X509_CERT_SIGN_DIGEST, OpenSSL, re, SignX509Certificate, HEX_CHAR_RE, GenerateSelfSignedX509Cert, VALID_X509_SIGNATURE_SALT, GetX509CertValidity, utils_hash, X509CertKeyCheck, time, GenerateSelfSignedSslCert, utils_io, GenerateSignedSslCert, constants, GenerateSignedX509Cert, logging, utils_text, VerifyX509Certificate, pathutils, CheckNodeCertificate, bitarray, GetFreeSlot, errors

Function Details

[hide private]

ForceDictType(target, key_types, allowed_values=None)

source code

Force the values of a dict to have certain types.

Parameters:

target (dict) - the dict to update
key_types (dict) - dict mapping target dict keys to types in constants.ENFORCEABLE_TYPES
allowed_values (list) - list of specially allowed values

ValidateServiceName(name)

source code

Validate the given service name.

Parameters:

name (number or string) - Service name or port specification

_ComputeMissingKeys(key_path, options, defaults)

source code

Helper functions to compute which keys a invalid.

Parameters:

key_path - The current key path (if any)
options - The user provided options
defaults - The default dictionary

Returns:

A list of invalid keys

VerifyDictOptions(options, defaults)

source code

Verify a dict has only keys set which also are in the defaults dict.

Parameters:

options - The user provided options
defaults - The default dictionary

Raises:

error.OpPrereqError - If one of the keys is not supported

ListVolumeGroups()

source code

List volume groups and their size

Returns: dict: Dictionary with keys volume name and values the size of the volume

BridgeExists(bridge)

source code

Check whether the given bridge exists in the system

Parameters:

bridge (str) - the bridge name to check

Returns: boolean

True if it does

TryConvert(fn, val)

source code

Try to convert a value ignoring errors.

This function tries to apply function fn to val. If no ValueError or TypeError exceptions are raised, it will return the result, else it will return the original value. Any other exceptions are propagated to the caller.

Parameters:

fn (callable) - function to apply to the value
val - the value to be converted

Returns:

The converted value if the conversion was successful, otherwise the original value.

ParseCpuMask(cpu_mask)

source code

Parse a CPU mask definition and return the list of CPU IDs.

CPU mask format: comma-separated list of CPU IDs or dash-separated ID ranges Example: "0-2,5" -> "0,1,2,5"

Parameters:

cpu_mask (str) - CPU mask definition

Returns: list of int

list of CPU IDs

ParseMultiCpuMask(cpu_mask)

source code

Parse a multiple CPU mask definition and return the list of CPU IDs.

CPU mask format: colon-separated list of comma-separated list of CPU IDs or dash-separated ID ranges, with optional "all" as CPU value Example: "0-2,5:all:1,5,6:2" -> [ [ 0,1,2,5 ], [ -1 ], [ 1, 5, 6 ], [ 2 ] ]

Parameters:

cpu_mask (str) - multiple CPU mask definition

Returns: list of lists of int

list of lists of CPU IDs

GetHomeDir(user, default=None)

source code

Try to get the homedir of the given user.

The user can be passed either as a string (denoting the name) or as an integer (denoting the user id). If the user is not found, the default argument is returned, which defaults to None.

FirstFree(seq, base=0)

source code

Returns the first non-existing integer from seq.

The seq argument should be a sorted list of positive integers. The first time the index of an element is smaller than the element value, the index will be returned.

The base argument is used to start at a different offset, i.e. [3, 4, 6] with offset=3 will return 5.

Example: [0, 1, 3] will return 2.

Parameters:

seq (sequence) - the sequence to be analyzed.
base (int) - use this value as the base index of the sequence

Returns: int

the first non-used index in the sequence

SingleWaitForFdCondition(fdobj, event, timeout)

source code

Waits for a condition to occur on the socket.

Immediately returns at the first interruption.

Parameters:

fdobj (integer or object supporting a fileno() method) - entity to wait for events on
event (integer) - ORed condition (see select module)
timeout (float or None) - Timeout in seconds

Returns: int or None

None for timeout, otherwise occured conditions

WaitForFdCondition(fdobj, event, timeout)

source code

Waits for a condition to occur on the socket.

Retries until the timeout is expired, even if interrupted.

Parameters:

fdobj (integer or object supporting a fileno() method) - entity to wait for events on
event (integer) - ORed condition (see select module)
timeout (float or None) - Timeout in seconds

Returns: int or None

None for timeout, otherwise occured conditions

EnsureDaemon(name)

source code

Check for and start daemon if not alive.

Parameters:

name (string) - daemon name

Returns: bool

'True' if daemon successfully started, 'False' otherwise

StopDaemon(name)

source code

Stop daemon

Parameters:

name (string) - daemon name

Returns: bool

'True' if daemon successfully stopped, 'False' otherwise

SplitTime(value)

source code

Splits time as floating point number into a tuple.

Parameters:

value (int or float) - Time in seconds

Returns:

Tuple containing (seconds, microseconds)

MergeTime(timetuple)

source code

Merges a tuple into time as a floating point number.

Parameters:

timetuple (tuple) - Time as tuple, (seconds, microseconds)

Returns:

Time as a floating point number expressed in seconds

EpochNano()

source code

Return the current timestamp expressed as number of nanoseconds since the unix epoch

Returns:: nanoseconds since the Unix epoch

FindMatch(data, name)

source code

Tries to find an item in a dictionary matching a name.

Callers have to ensure the data names aren't contradictory (e.g. a regexp that matches a string). If the name isn't a direct key, all regular expression objects in the dictionary are matched against it.

Parameters:

data (dict) - Dictionary containing data
name (string) - Name to look for

Returns: tuple; (value in dictionary, matched groups as list)

GetMounts(filename=constants.PROC_MOUNTS)

source code

Returns the list of mounted filesystems.

This function is Linux-specific.

Parameters:

filename - path of mounts file (/proc/mounts by default)

Returns: list of tuples

list of mount entries (device, mountpoint, fstype, options)

SignalHandled(signums)

source code

Signal Handled decoration.

This special decorator installs a signal handler and then calls the target function. The function must accept a 'signal_handlers' keyword argument, which will contain a dict indexed by signal number, with SignalHandler objects as values.

The decorator can be safely stacked with iself, to handle multiple signals with different handlers.

Parameters: