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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"""
21Error handling classes and functions.
22
23This module exports a single function:
24
25 formatErrorMsg - Properly formats an error message.
26
27It 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"""
39import gettext
40_ = lambda x: gettext.ldgettext("pykickstart", x)
41
42def 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
50class 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
62class 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
76class 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
91class 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