Package ganeti :: Package storage :: Module filestorage

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Module filestorage

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Filesystem-based access functions and disk templates.

Classes

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FileDeviceHelper

FileStorage
File device.

Functions

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GetFileStorageSpaceInfo(path)
Retrieves the free and total space of the device where the file is located.

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frozenset

_GetForbiddenFileStoragePaths()
Builds a list of path prefixes which shouldn't be used for file storage.

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list

_ComputeWrongFileStoragePaths(paths, _forbidden=_GetForbiddenFileStoragePaths())
Cross-checks a list of paths for prefixes considered bad.

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ComputeWrongFileStoragePaths(_filename=pathutils.FILE_STORAGE_PATHS_FILE)
Returns a list of file storage paths whose prefix is considered bad.

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_CheckFileStoragePath(path, allowed, exact_match_ok=False)
Checks if a path is in a list of allowed paths for file storage.

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list

_LoadAllowedFileStoragePaths(filename)
Loads file containing allowed file storage paths.

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CheckFileStoragePathAcceptance(path, _filename=pathutils.FILE_STORAGE_PATHS_FILE, exact_match_ok=False)
Checks if a path is allowed for file storage.

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_CheckFileStoragePathExistance(path)
Checks whether the given path is usable on the file system.

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string

CheckFileStoragePath(path, _allowed_paths_file=pathutils.FILE_STORAGE_PATHS_FILE)
Checks whether the path exists and is acceptable to use.

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Imports: logging, errno, os, compat, constants, errors, pathutils, utils, io, base

Function Details

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GetFileStorageSpaceInfo(path)

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Retrieves the free and total space of the device where the file is located.

Parameters:

path (string) - Path of the file whose embracing device's capacity is reported.

Returns:

a dictionary containing 'vg_size' and 'vg_free' given in MebiBytes

_ComputeWrongFileStoragePaths(paths, _forbidden=_GetForbiddenFileStoragePaths())

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Cross-checks a list of paths for prefixes considered bad.

Some paths, e.g. "/bin", should not be used for file storage.

Parameters:

paths (list) - List of paths to be checked

Returns: list

Sorted list of paths for which the user should be warned

ComputeWrongFileStoragePaths(_filename=pathutils.FILE_STORAGE_PATHS_FILE)

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Returns a list of file storage paths whose prefix is considered bad.

See _ComputeWrongFileStoragePaths.

_CheckFileStoragePath(path, allowed, exact_match_ok=False)

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Checks if a path is in a list of allowed paths for file storage.

Parameters:

path (string) - Path to check
allowed (list) - List of allowed paths
exact_match_ok (bool) - whether or not it is okay when the path is exactly equal to an allowed path and not a subdir of it

Raises:

errors.FileStoragePathError - If the path is not allowed

_LoadAllowedFileStoragePaths(filename)

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Loads file containing allowed file storage paths.

Returns: list: List of allowed paths (can be an empty list)

CheckFileStoragePathAcceptance(path, _filename=pathutils.FILE_STORAGE_PATHS_FILE, exact_match_ok=False)

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Checks if a path is allowed for file storage.

Parameters:

path (string) - Path to check

Raises:

errors.FileStoragePathError - If the path is not allowed

_CheckFileStoragePathExistance(path)

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Checks whether the given path is usable on the file system.

This checks wether the path is existing, a directory and writable.

Parameters:

path (string) - path to check

CheckFileStoragePath(path, _allowed_paths_file=pathutils.FILE_STORAGE_PATHS_FILE)

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Checks whether the path exists and is acceptable to use.

Can be used for any file-based storage, for example shared-file storage.

Parameters:

path (string) - path to check

Returns: string

error message if the path is not ready to use