/brz/remove-bazaar

# Copyright (C) 2005, 2006 Canonical

# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Exceptions for bzr, and reporting of them.

Exceptions are caught at a high level to report errors to the user, and

might also be caught inside the program.  Therefore it needs to be

possible to convert them to a meaningful string, and also for them to be

interrogated by the program.

Exceptions are defined such that the arguments given to the constructor

are stored in the object as properties of the same name.  When the

object is printed as a string, the doc string of the class is used as

a format string with the property dictionary available to it.

This means that exceptions can used like this:

>>> import sys

>>> try:

...   raise NotBranchError(path='/foo/bar')

... except:

...   print sys.exc_type

...   print sys.exc_value

...   path = getattr(sys.exc_value, 'path')

...   if path is not None:

...     print path

bzrlib.errors.NotBranchError

Not a branch: /foo/bar

/foo/bar

Therefore:

 * create a new exception class for any class of error that can be

   usefully distinguished.

 * the printable form of an exception is generated by the base class

   __str__ method

Exception strings should start with a capital letter and not have a final

fullstop.

"""

# based on Scott James Remnant's hct error classes

# TODO: is there any value in providing the .args field used by standard

# python exceptions?   A list of values with no names seems less useful 

# to me.

# TODO: Perhaps convert the exception to a string at the moment it's 

# constructed to make sure it will succeed.  But that says nothing about

# exceptions that are never raised.

# TODO: Convert all the other error classes here to BzrNewError, and eliminate

# the old one.

class BzrError(StandardError):

    def __str__(self):

        # XXX: Should we show the exception class in 

        # exceptions that don't provide their own message?  

        # maybe it should be done at a higher level

        ## n = self.__class__.__name__ + ': '

        n = ''

        if len(self.args) == 1:

            return str(self.args[0])

        elif len(self.args) == 2:

            # further explanation or suggestions

            try:

                return n + '\n  '.join([self.args[0]] + self.args[1])

            except TypeError:

                return n + "%r" % self

        else:

            return n + `self.args`

class BzrNewError(BzrError):

    """bzr error"""

    # base classes should override the docstring with their human-

    # readable explanation

    def __init__(self, **kwds):

        for key, value in kwds.items():

            setattr(self, key, value)

    def __str__(self):

        try:

            return self.__doc__ % self.__dict__

        except (NameError, ValueError, KeyError), e:

            return 'Unprintable exception %s: %s' \

                % (self.__class__.__name__, str(e))

class BzrCheckError(BzrNewError):

    """Internal check failed: %(message)s"""

    def __init__(self, message):

        BzrNewError.__init__(self)

        self.message = message

class InvalidEntryName(BzrNewError):

    """Invalid entry name: %(name)s"""

    def __init__(self, name):

        BzrNewError.__init__(self)

        self.name = name

class InvalidRevisionNumber(BzrNewError):

    """Invalid revision number %(revno)d"""

    def __init__(self, revno):

        BzrNewError.__init__(self)

        self.revno = revno

class InvalidRevisionId(BzrNewError):

    """Invalid revision-id {%(revision_id)s} in %(branch)s"""

    def __init__(self, revision_id, branch):

        BzrNewError.__init__(self)

        self.revision_id = revision_id

        self.branch = branch

class NoWorkingTree(BzrNewError):

    """No WorkingTree exists for %s(base)."""

    def __init__(self, base):

        BzrNewError.__init__(self)

        self.base = base

class NotLocalUrl(BzrNewError):

    """%s(url) is not a local path."""

    def __init__(self, url):

        BzrNewError.__init__(self)

        self.url = url

class BzrCommandError(BzrError):

    # Error from malformed user command

    # This is being misused as a generic exception

    # pleae subclass. RBC 20051030

    #

    # I think it's a waste of effort to differentiate between errors that

    # are not intended to be caught anyway.  UI code need not subclass

    # BzrCommandError, and non-UI code should not throw a subclass of

    # BzrCommandError.  ADHB 20051211

    def __str__(self):

        return self.args[0]

class BzrOptionError(BzrCommandError):

    """Some missing or otherwise incorrect option was supplied."""

class StrictCommitFailed(Exception):

    """Commit refused because there are unknowns in the tree."""

class PathError(BzrNewError):

    """Generic path error: %(path)r%(extra)s)"""

    def __init__(self, path, extra=None):

        BzrNewError.__init__(self)

        self.path = path

        if extra:

            self.extra = ': ' + str(extra)

        else:

            self.extra = ''

class NoSuchFile(PathError):

    """No such file: %(path)r%(extra)s"""

class FileExists(PathError):

    """File exists: %(path)r%(extra)s"""

class DirectoryNotEmpty(PathError):

    """Directory not empty: %(path)r%(extra)s"""

class PermissionDenied(PathError):

    """Permission denied: %(path)r%(extra)s"""

class PathNotChild(BzrNewError):

    """Path %(path)r is not a child of path %(base)r%(extra)s"""

    def __init__(self, path, base, extra=None):

        BzrNewError.__init__(self)

        self.path = path

        self.base = base

        if extra:

            self.extra = ': ' + str(extra)

        else:

            self.extra = ''

class NotBranchError(BzrNewError):

    """Not a branch: %(path)s"""

    def __init__(self, path):

        BzrNewError.__init__(self)

        self.path = path

class NoRepositoryPresent(BzrNewError):

    """Not repository present: %(path)r"""

    def __init__(self, bzrdir):

        BzrNewError.__init__(self)

        self.path = bzrdir.transport.clone('..').base

class FileInWrongBranch(BzrNewError):

    """File %(path)s in not in branch %(branch_base)s."""

    def __init__(self, branch, path):

        BzrNewError.__init__(self)

        self.branch = branch

        self.branch_base = branch.base

        self.path = path

class UnsupportedFormatError(BzrError):

    """Specified path is a bzr branch that we recognize but cannot read."""

    def __str__(self):

        return 'unsupported branch format: %s' % self.args[0]

class UnknownFormatError(BzrError):

    """Specified path is a bzr branch whose format we do not recognize."""

    def __str__(self):

        return 'unknown branch format: %s' % self.args[0]

class IncompatibleFormat(BzrNewError):

    """Format %(format)s is not compatible with .bzr version %(bzrdir)s."""

    def __init__(self, format, bzrdir_format):

        BzrNewError.__init__(self)

        self.format = format

        self.bzrdir = bzrdir_format

class NotVersionedError(BzrNewError):

    """%(path)s is not versioned"""

    def __init__(self, path):

        BzrNewError.__init__(self)

        self.path = path

class BadFileKindError(BzrError):

    """Specified file is of a kind that cannot be added.

    (For example a symlink or device file.)"""

class ForbiddenFileError(BzrError):

    """Cannot operate on a file because it is a control file."""

class LockError(BzrNewError):

    """Lock error: %(message)s"""

    # All exceptions from the lock/unlock functions should be from

    # this exception class.  They will be translated as necessary. The

    # original exception is available as e.original_error

    #

    # New code should prefer to raise specific subclasses

    def __init__(self, message):

        self.message = message

class CommitNotPossible(LockError):

    """A commit was attempted but we do not have a write lock open."""

    def __init__(self):

        pass

class AlreadyCommitted(LockError):

    """A rollback was requested, but is not able to be accomplished."""

    def __init__(self):

        pass

class ReadOnlyError(LockError):

    """A write attempt was made in a read only transaction on %(obj)s"""

    def __init__(self, obj):

        self.obj = obj

class ObjectNotLocked(LockError):

    """%(obj)r is not locked"""

    # this can indicate that any particular object is not locked; see also

    # LockNotHeld which means that a particular *lock* object is not held by

    # the caller -- perhaps they should be unified.

    def __init__(self, obj):

        self.obj = obj

class ReadOnlyObjectDirtiedError(ReadOnlyError):

    """Cannot change object %(obj)r in read only transaction"""

    def __init__(self, obj):

        self.obj = obj

class UnlockableTransport(LockError):

    """Cannot lock: transport is read only: %(transport)s"""

    def __init__(self, transport):

        self.transport = transport

class LockContention(LockError):

    """Could not acquire lock %(lock)s"""

    # TODO: show full url for lock, combining the transport and relative bits?

    def __init__(self, lock):

        self.lock = lock

class LockBroken(LockError):

    """Lock was broken while still open: %(lock)s - check storage consistency!"""

    def __init__(self, lock):

        self.lock = lock

class LockBreakMismatch(LockError):

    """Lock was released and re-acquired before being broken: %(lock)s: held by %(holder)r, wanted to break %(target)r"""

    def __init__(self, lock, holder, target):

        self.lock = lock

        self.holder = holder

        self.target = target

class LockNotHeld(LockError):

    """Lock not held: %(lock)s"""

    def __init__(self, lock):

        self.lock = lock

class PointlessCommit(BzrNewError):

    """No changes to commit"""

class UpgradeReadonly(BzrNewError):

    """Upgrade URL cannot work with readonly URL's."""

class UpToDateFormat(BzrNewError):

    """The branch format %(format)s is already at the most recent format."""

    def __init__(self, format):

        BzrNewError.__init__(self)

        self.format = format

class StrictCommitFailed(Exception):

    """Commit refused because there are unknowns in the tree."""

class NoSuchRevision(BzrError):

    def __init__(self, branch, revision):

        self.branch = branch

        self.revision = revision

        msg = "Branch %s has no revision %s" % (branch, revision)

        BzrError.__init__(self, msg)

class HistoryMissing(BzrError):

    def __init__(self, branch, object_type, object_id):

        self.branch = branch

        BzrError.__init__(self,

                          '%s is missing %s {%s}'

                          % (branch, object_type, object_id))

class DivergedBranches(BzrError):

    def __init__(self, branch1, branch2):

        BzrError.__init__(self, "These branches have diverged.  Try merge.")

        self.branch1 = branch1

        self.branch2 = branch2

class UnrelatedBranches(BzrCommandError):

    def __init__(self):

        msg = "Branches have no common ancestor, and no base revision"\

            " specified."

        BzrCommandError.__init__(self, msg)

class NoCommonAncestor(BzrError):

    def __init__(self, revision_a, revision_b):

        msg = "Revisions have no common ancestor: %s %s." \

            % (revision_a, revision_b) 

        BzrError.__init__(self, msg)

class NoCommonRoot(BzrError):

    def __init__(self, revision_a, revision_b):

        msg = "Revisions are not derived from the same root: %s %s." \

            % (revision_a, revision_b) 

        BzrError.__init__(self, msg)

class NotAncestor(BzrError):

    def __init__(self, rev_id, not_ancestor_id):

        msg = "Revision %s is not an ancestor of %s" % (not_ancestor_id, 

                                                        rev_id)

        BzrError.__init__(self, msg)

        self.rev_id = rev_id

        self.not_ancestor_id = not_ancestor_id

class InstallFailed(BzrError):

    def __init__(self, revisions):

        msg = "Could not install revisions:\n%s" % " ,".join(revisions)

        BzrError.__init__(self, msg)

        self.revisions = revisions

class AmbiguousBase(BzrError):

    def __init__(self, bases):

        msg = "The correct base is unclear, becase %s are all equally close" %\

            ", ".join(bases)

        BzrError.__init__(self, msg)

        self.bases = bases

class NoCommits(BzrError):

    def __init__(self, branch):

        msg = "Branch %s has no commits." % branch

        BzrError.__init__(self, msg)

class UnlistableStore(BzrError):

    def __init__(self, store):

        BzrError.__init__(self, "Store %s is not listable" % store)

class UnlistableBranch(BzrError):

    def __init__(self, br):

        BzrError.__init__(self, "Stores for branch %s are not listable" % br)

class WeaveError(BzrNewError):

    """Error in processing weave: %(message)s"""

    def __init__(self, message=None):

        BzrNewError.__init__(self)

        self.message = message

class WeaveRevisionAlreadyPresent(WeaveError):

    """Revision {%(revision_id)s} already present in %(weave)s"""

    def __init__(self, revision_id, weave):

        WeaveError.__init__(self)

        self.revision_id = revision_id

        self.weave = weave

class WeaveRevisionNotPresent(WeaveError):

    """Revision {%(revision_id)s} not present in %(weave)s"""

    def __init__(self, revision_id, weave):

        WeaveError.__init__(self)

        self.revision_id = revision_id

        self.weave = weave

class WeaveFormatError(WeaveError):

    """Weave invariant violated: %(what)s"""

    def __init__(self, what):

        WeaveError.__init__(self)

        self.what = what

class WeaveParentMismatch(WeaveError):

    """Parents are mismatched between two revisions."""

class WeaveInvalidChecksum(WeaveError):

    """Text did not match it's checksum: %(message)s"""

class WeaveTextDiffers(WeaveError):

    """Weaves differ on text content. Revision: {%(revision_id)s}, %(weave_a)s, %(weave_b)s"""

    def __init__(self, revision_id, weave_a, weave_b):

        WeaveError.__init__(self)

        self.revision_id = revision_id

        self.weave_a = weave_a

        self.weave_b = weave_b

class WeaveTextDiffers(WeaveError):

    """Weaves differ on text content. Revision: {%(revision_id)s}, %(weave_a)s, %(weave_b)s"""

    def __init__(self, revision_id, weave_a, weave_b):

        WeaveError.__init__(self)

        self.revision_id = revision_id

        self.weave_a = weave_a

        self.weave_b = weave_b

class NoSuchExportFormat(BzrNewError):

    """Export format %(format)r not supported"""

    def __init__(self, format):

        BzrNewError.__init__(self)

        self.format = format

class TransportError(BzrError):

    """All errors thrown by Transport implementations should derive

    from this class.

    """

    def __init__(self, msg=None, orig_error=None):

        if msg is None and orig_error is not None:

            msg = str(orig_error)

        BzrError.__init__(self, msg)

        self.msg = msg

        self.orig_error = orig_error

# A set of semi-meaningful errors which can be thrown

class TransportNotPossible(TransportError):

    """This is for transports where a specific function is explicitly not

    possible. Such as pushing files to an HTTP server.

    """

    pass

class ConnectionError(TransportError):

    """A connection problem prevents file retrieval.

    This does not indicate whether the file exists or not; it indicates that a

    precondition for requesting the file was not met.

    """

    def __init__(self, msg=None, orig_error=None):

        TransportError.__init__(self, msg=msg, orig_error=orig_error)

class ConnectionReset(TransportError):

    """The connection has been closed."""

    pass

class ConflictsInTree(BzrError):

    def __init__(self):

        BzrError.__init__(self, "Working tree has conflicts.")

class ParseConfigError(BzrError):

    def __init__(self, errors, filename):

        if filename is None:

            filename = ""

        message = "Error(s) parsing config file %s:\n%s" % \

            (filename, ('\n'.join(e.message for e in errors)))

        BzrError.__init__(self, message)

class SigningFailed(BzrError):

    def __init__(self, command_line):

        BzrError.__init__(self, "Failed to gpg sign data with command '%s'"

                               % command_line)

class WorkingTreeNotRevision(BzrError):

    def __init__(self, tree):

        BzrError.__init__(self, "The working tree for %s has changed since"

                          " last commit, but weave merge requires that it be"

                          " unchanged." % tree.basedir)

class CantReprocessAndShowBase(BzrNewError):

    """Can't reprocess and show base.

Reprocessing obscures relationship of conflicting lines to base."""

class GraphCycleError(BzrNewError):

    """Cycle in graph %(graph)r"""

    def __init__(self, graph):

        BzrNewError.__init__(self)

        self.graph = graph

class NotConflicted(BzrNewError):

    """File %(filename)s is not conflicted."""

    def __init__(self, filename):

        BzrNewError.__init__(self)

        self.filename = filename

class MustUseDecorated(Exception):

    """A decorating function has requested its original command be used.

    This should never escape bzr, so does not need to be printable.

    """

class MissingText(BzrNewError):

    """Branch %(base)s is missing revision %(text_revision)s of %(file_id)s"""

    def __init__(self, branch, text_revision, file_id):

        BzrNewError.__init__(self)

        self.branch = branch

        self.base = branch.base

        self.text_revision = text_revision

        self.file_id = file_id

class DuplicateKey(BzrNewError):

    """Key %(key)s is already present in map"""

class MalformedTransform(BzrNewError):

    """Tree transform is malformed %(conflicts)r"""

class BzrBadParameter(BzrNewError):

    """A bad parameter : %(param)s is not usable.

    This exception should never be thrown, but it is a base class for all

    parameter-to-function errors.

    """

    def __init__(self, param):

        BzrNewError.__init__(self)

        self.param = param

class BzrBadParameterNotUnicode(BzrBadParameter):

    """Parameter %(param)s is neither unicode nor utf8."""

class ReusingTransform(BzrNewError):

    """Attempt to reuse a transform that has already been applied."""

class CantMoveRoot(BzrNewError):

    """Moving the root directory is not supported at this time"""

class BzrBadParameterNotString(BzrBadParameter):

    """Parameter %(param)s is not a string or unicode string."""

class BzrBadParameterMissing(BzrBadParameter):

    """Parameter $(param)s is required but not present."""

class DependencyNotPresent(BzrNewError):

    """Unable to import library: %(library)s, %(error)s"""

    def __init__(self, library, error):

        BzrNewError.__init__(self, library=library, error=error)

class ParamikoNotPresent(DependencyNotPresent):

    """Unable to import paramiko (required for sftp support): %(error)s"""

    def __init__(self, error):

        DependencyNotPresent.__init__(self, 'paramiko', error)

class UninitializableFormat(BzrNewError):

    """Format %(format)s cannot be initialised by this version of bzr."""

    def __init__(self, format):

        BzrNewError.__init__(self)

        self.format = format

class NoDiff3(BzrNewError):

    """Diff3 is not installed on this machine."""

class ExistingLimbo(BzrNewError):

    """This tree contains left-over files from a failed operation.

    Please examine %(limbo_dir)s to see if it contains any files you wish to

    keep, and delete it when you are done.

    """

    def __init__(self, limbo_dir):

       BzrNewError.__init__(self)

       self.limbo_dir = limbo_dir

class ImmortalLimbo(BzrNewError):

    """Unable to delete transform temporary directory $(limbo_dir)s.

    Please examine %(limbo_dir)s to see if it contains any files you wish to

    keep, and delete it when you are done.

    """

    def __init__(self, limbo_dir):

       BzrNewError.__init__(self)

       self.limbo_dir = limbo_dir

class OutOfDateTree(BzrNewError):

    """Working tree is out of date, please run 'bzr update'."""

    def __init__(self, tree):

        BzrNewError.__init__(self)

        self.tree = tree