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"""
fs.errors: error class definitions for FS
"""
import sys
import errno
try:
from functools import wraps
except ImportError:
def wraps(func):
def decorator(wfunc):
wfunc.__name__ == func.__name__
wfunc.__doc__ == func.__doc__
wfunc.__module__ == func.__module__
return decorator
class FSError(Exception):
"""Base exception class for the FS module."""
default_message = "Unspecified error"
def __init__(self,msg=None,details=None):
if msg is None:
msg = self.default_message
self.msg = msg
self.details = details
def __str__(self):
keys = dict((k,str(v)) for k,v in self.__dict__.iteritems())
return self.msg % keys
def __unicode__(self):
return unicode(str(self))
class PathError(FSError):
"""Exception for errors to do with a path string."""
default_message = "Path is invalid: %(path)s"
def __init__(self,path,**kwds):
self.path = path
super(PathError,self).__init__(**kwds)
class OperationFailedError(FSError):
"""Base exception class for errors associated with a specific operation."""
default_message = "Unable to %(opname)s: unspecified error [%(errno)s - %(details)s]"
def __init__(self,opname,path=None,**kwds):
self.opname = opname
self.path = path
self.errno = getattr(kwds.get("details",None),"errno",None)
super(OperationFailedError,self).__init__(**kwds)
class UnsupportedError(OperationFailedError):
"""Exception raised for operations that are not supported by the FS."""
default_message = "Unable to %(opname)s: not supported by this filesystem"
class RemoteConnectionError(OperationFailedError):
"""Exception raised when operations encounter remote connection trouble."""
default_message = "Unable to %(opname)s: remote connection errror"
class StorageSpaceError(OperationFailedError):
"""Exception raised when operations encounter storage space trouble."""
default_message = "Unable to %(opname)s: insufficient storage space"
class PermissionDeniedError(OperationFailedError):
default_message = "Unable to %(opname)s: permission denied"
class ResourceError(FSError):
"""Base exception class for error associated with a specific resource."""
default_message = "Unspecified resource error: %(path)s"
def __init__(self,path,**kwds):
self.path = path
self.opname = kwds.pop("opname",None)
super(ResourceError,self).__init__(**kwds)
class NoSysPathError(ResourceError):
"""Exception raised when there is no syspath for a given path."""
default_message = "No mapping to OS filesystem: %(path)s"
class ResourceNotFoundError(ResourceError):
"""Exception raised when a required resource is not found."""
default_message = "Resource not found: %(path)s"
class ResourceInvalidError(ResourceError):
"""Exception raised when a resource is the wrong type."""
default_message = "Resource is invalid: %(path)s"
class DestinationExistsError(ResourceError):
"""Exception raised when a target destination already exists."""
default_message = "Destination exists: %(path)s"
class DirectoryNotEmptyError(ResourceError):
"""Exception raised when a directory to be removed is not empty."""
default_message = "Directory is not empty: %(path)s"
class ParentDirectoryMissingError(ResourceError):
"""Exception raised when a parent directory is missing."""
default_message = "Parent directory is missing: %(path)s"
class ResourceLockedError(ResourceError):
"""Exception raised when a resource can't be used because it is locked."""
default_message = "Resource is locked: %(path)s"
def convert_fs_errors(func):
"""Function wrapper to convert FSError instances into OSErrors."""
@wraps(func)
def wrapper(*args,**kwds):
try:
return func(*args,**kwds)
except ResourceNotFoundError, e:
raise OSError(errno.ENOENT,str(e))
except ResourceInvalidError, e:
raise OSError(errno.EINVAL,str(e))
except PermissionDeniedError, e:
raise OSError(errno.EACCESS,str(e))
except DirectoryNotEmptyError, e:
raise OSError(errno.ENOTEMPTY,str(e))
except DestinationExistsError, e:
raise OSError(errno.EEXIST,str(e))
except StorageSpaceError, e:
raise OSError(errno.ENOSPC,str(e))
except RemoteConnectionError, e:
raise OSError(errno.ENONET,str(e))
except UnsupportedError, e:
raise OSError(errno.ENOSYS,str(e))
except FSError, e:
raise OSError(errno.EFAULT,str(e))
return wrapper
def convert_os_errors(func):
"""Function wrapper to convert OSError/IOError instances into FSErrors."""
opname = func.__name__
@wraps(func)
def wrapper(*args,**kwds):
try:
return func(*args,**kwds)
except (OSError,IOError), e:
if not hasattr(e,"errno") or not e.errno:
raise OperationFailedError(opname,details=e)
if e.errno == errno.ENOENT:
raise ResourceNotFoundError(e.filename,opname=opname,details=e)
if e.errno == errno.ENOTEMPTY:
raise DirectoryNotEmptyError(e.filename,opname=opname,details=e)
if e.errno == errno.EEXIST:
raise DestinationExistsError(e.filename,opname=opname,details=e)
if e.errno == 183: # some sort of win32 equivalent to EEXIST
raise DestinationExistsError(e.filename,opname=opname,details=e)
if e.errno == errno.ENOTDIR:
raise ResourceInvalidError(e.filename,opname=opname,details=e)
if e.errno == errno.EISDIR:
raise ResourceInvalidError(e.filename,opname=opname,details=e)
if e.errno == errno.EINVAL:
raise ResourceInvalidError(e.filename,opname=opname,details=e)
raise OperationFailedError(opname,details=e)
return wrapper
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