pykickstart/errors.py

   1 #
   2 # errors.py:  Kickstart error handling.
   3 #
   4 # Chris Lumens <clumens@redhat.com>
   5 #
   6 # This copyrighted material is made available to anyone wishing to use, modify,
   7 # copy, or redistribute it subject to the terms and conditions of the GNU
   8 # General Public License v.2.  This program is distributed in the hope that it
   9 # will be useful, but WITHOUT ANY WARRANTY expressed or implied, including the
  10 # implied warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11 # See the GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License along with
  14 # this program; if not, write to the Free Software Foundation, Inc., 51
  15 # Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  Any Red Hat
  16 # trademarks that are incorporated in the source code or documentation are not
  17 # subject to the GNU General Public License and may only be used or replicated
  18 # with the express permission of Red Hat, Inc.
  19 #
  20 """
  21 Error handling classes and functions.
  22
  23 This module exports a single function:
  24
  25     formatErrorMsg - Properly formats an error message.
  26
  27 It also exports several exception classes:
  28
  29     KickstartError - A generic exception class.
  30
  31     KickstartParseError - An exception for errors relating to parsing.
  32
  33     KickstartValueError - An exception for errors relating to option
  34                           processing.
  35
  36     KickstartVersionError - An exception for errors relating to unsupported
  37                             syntax versions.
  38 """
  39 import gettext
  40 _ = lambda x: gettext.ldgettext("pykickstart", x)
  41
  42 def formatErrorMsg(lineno, msg=""):
  43     """Properly format the error message msg for inclusion in an exception."""
  44     if msg != "":
  45         mapping = {"lineno": lineno, "msg": msg}
  46         return _("The following problem occurred on line %(lineno)s of the kickstart file:\n\n%(msg)s\n") % mapping
  47     else:
  48         return _("There was a problem reading from line %s of the kickstart file") % lineno
  49
  50 class KickstartError(Exception):
  51     """A generic exception class for unspecific error conditions."""
  52     def __init__(self, val = ""):
  53         """Create a new KickstartError exception instance with the descriptive
  54            message val.  val should be the return value of formatErrorMsg.
  55         """
  56         Exception.__init__(self)
  57         self.value = val
  58
  59     def __str__ (self):
  60         return self.value
  61
  62 class KickstartParseError(KickstartError):
  63     """An exception class for errors when processing the input file, such as
  64        unknown options, commands, or sections.
  65     """
  66     def __init__(self, msg):
  67         """Create a new KickstartParseError exception instance with the
  68            descriptive message val.  val should be the return value of
  69            formatErrorMsg.
  70         """
  71         KickstartError.__init__(self, msg)
  72
  73     def __str__(self):
  74         return self.value
  75
  76 class KickstartValueError(KickstartError):
  77     """An exception class for errors when processing arguments to commands,
  78        such as too many arguments, too few arguments, or missing required
  79        arguments.
  80     """
  81     def __init__(self, msg):
  82         """Create a new KickstartValueError exception instance with the
  83            descriptive message val.  val should be the return value of
  84            formatErrorMsg.
  85         """
  86         KickstartError.__init__(self, msg)
  87
  88     def __str__ (self):
  89         return self.value
  90
  91 class KickstartVersionError(KickstartError):
  92     """An exception class for errors related to using an incorrect version of
  93        kickstart syntax.
  94     """
  95     def __init__(self, msg):
  96         """Create a new KickstartVersionError exception instance with the
  97            descriptive message val.  val should be the return value of
  98            formatErrorMsg.
  99         """
 100         KickstartError.__init__(self, msg)
 101
 102     def __str__ (self):
 103         return self.value