Source code for SCons.Errors

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"""SCons exception classes.

Used to handle internal and user errors in SCons.
"""

import shutil
import SCons.Util

# Note that not all Errors are defined here, some are at the point of use


[docs]class BuildError(Exception): """SCons Errors that can occur while building. A :class:`BuildError` exception contains information both about the erorr itself, and what caused the error. Attributes: node: (*cause*) the error occurred while building this target node(s) errstr: (*info*) a description of the error message status: (*info*) the return code of the action that caused the build error. Must be set to a non-zero value even if the build error is not due to an action returning a non-zero returned code. exitstatus: (*info*) SCons exit status due to this build error. Must be nonzero unless due to an explicit :meth:`Exit` call. Not always the same as ``status``, since actions return a status code that should be respected, but SCons typically exits with 2 irrespective of the return value of the failed action. filename: (*info*) The name of the file or directory that caused the build error. Set to ``None`` if no files are associated with this error. This might be different from the target being built. For example, failure to create the directory in which the target file will appear. It can be ``None`` if the error is not due to a particular filename. executor: (*cause*) the executor that caused the build to fail (might be ``None`` if the build failures is not due to the executor failing) action: (*cause*) the action that caused the build to fail (might be ``None`` if the build failures is not due to the an action failure) command: (*cause*) the command line for the action that caused the build to fail (might be ``None`` if the build failures is not due to the an action failure) exc_info: (*info*) Info about exception that caused the build error. Set to ``(None, None, None)`` if this build error is not due to an exception. """ def __init__(self, node=None, errstr="Unknown error", status=2, exitstatus=2, filename=None, executor=None, action=None, command=None, exc_info=(None, None, None)): # py3: errstr should be string and not bytes. self.errstr = SCons.Util.to_String(errstr) self.status = status self.exitstatus = exitstatus self.filename = filename self.exc_info = exc_info self.node = node self.executor = executor self.action = action self.command = command super().__init__(node, errstr, status, exitstatus, filename, executor, action, command, exc_info) def __str__(self): if self.filename: return self.filename + ': ' + self.errstr else: return self.errstr
[docs]class InternalError(Exception): pass
[docs]class UserError(Exception): pass
[docs]class StopError(Exception): pass
[docs]class SConsEnvironmentError(Exception): pass
[docs]class MSVCError(IOError): pass
[docs]class ExplicitExit(Exception): def __init__(self, node=None, status=None, *args): self.node = node self.status = status self.exitstatus = status super().__init__(*args)
[docs]def convert_to_BuildError(status, exc_info=None): """Convert a return code to a BuildError Exception. The `buildError.status` we set here will normally be used as the exit status of the "scons" process. Args: status: can either be a return code or an Exception. exc_info (tuple, optional): explicit exception information. """ if not exc_info and isinstance(status, Exception): exc_info = (status.__class__, status, None) if isinstance(status, BuildError): buildError = status buildError.exitstatus = 2 # always exit with 2 on build errors elif isinstance(status, ExplicitExit): status = status.status errstr = 'Explicit exit, status %s' % status buildError = BuildError( errstr=errstr, status=status, # might be 0, OK here exitstatus=status, # might be 0, OK here exc_info=exc_info) elif isinstance(status, (StopError, UserError)): buildError = BuildError( errstr=str(status), status=2, exitstatus=2, exc_info=exc_info) elif isinstance(status, shutil.SameFileError): # PY3 has a exception for when copying file to itself # It's object provides info differently than below try: filename = status.filename except AttributeError: filename = None buildError = BuildError( errstr=status.args[0], status=status.errno, exitstatus=2, filename=filename, exc_info=exc_info) elif isinstance(status, (SConsEnvironmentError, OSError, IOError)): # If an IOError/OSError happens, raise a BuildError. # Report the name of the file or directory that caused the # error, which might be different from the target being built # (for example, failure to create the directory in which the # target file will appear). filename = getattr(status, 'filename', None) strerror = getattr(status, 'strerror', str(status)) errno = getattr(status, 'errno', 2) buildError = BuildError( errstr=strerror, status=errno, exitstatus=2, filename=filename, exc_info=exc_info) elif isinstance(status, Exception): buildError = BuildError( errstr='%s : %s' % (status.__class__.__name__, status), status=2, exitstatus=2, exc_info=exc_info) elif SCons.Util.is_String(status): buildError = BuildError( errstr=status, status=2, exitstatus=2) else: buildError = BuildError( errstr="Error %s" % status, status=status, exitstatus=2) #import sys #sys.stderr.write("convert_to_BuildError: status %s => (errstr %s, status %s)\n"%(status,buildError.errstr, buildError.status)) return buildError
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