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1#
2# Chris Lumens <clumens@redhat.com>
3#
4# Copyright 2006, 2007, 2008, 2009, 2010 Red Hat, Inc.
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"""
21Methods for working with kickstart versions.
22
23This module defines several symbolic constants that specify kickstart syntax
24versions. Each version corresponds roughly to one release of Red Hat Linux,
25Red Hat Enterprise Linux, or Fedora Core as these are where most syntax
26changes take place.
27
28This module also exports several functions:
29
30 makeVersion - Given a version number, return an instance of the
31 matching handler class.
32
33 returnClassForVersion - Given a version number, return the matching
34 handler class. This does not return an
35 instance of that class, however.
36
37 stringToVersion - Convert a string representation of a version number
38 into the symbolic constant.
39
40 versionToString - Perform the reverse mapping.
41
42 versionFromFile - Read a kickstart file and determine the version of
43 syntax it uses. This requires the kickstart file to
44 have a version= comment in it.
45"""
46import imputil, re, sys
47from urlgrabber import urlopen
48
49import gettext
50_ = lambda x: gettext.ldgettext("pykickstart", x)
51
52from pykickstart.errors import KickstartVersionError
53
54# Symbolic names for internal version numbers.
55RHEL3 = 900
56FC3 = 1000
57RHEL4 = 1100
58FC4 = 2000
59FC5 = 3000
60FC6 = 4000
61RHEL5 = 4100
62F7 = 5000
63F8 = 6000
64F9 = 7000
65F10 = 8000
66F11 = 9000
67F12 = 10000
68F13 = 11000
69RHEL6 = 11100
70F14 = 12000
71F15 = 13000
72F16 = 14000
73
74# This always points at the latest version and is the default.
75DEVEL = F16
76
77# A one-to-one mapping from string representations to version numbers.
78versionMap = {
79 "DEVEL": DEVEL,
80 "FC3": FC3, "FC4": FC4, "FC5": FC5, "FC6": FC6, "F7": F7, "F8": F8,
81 "F9": F9, "F10": F10, "F11": F11, "F12": F12, "F13": F13,
82 "F14": F14, "F15": F15, "F16": F16,
83 "RHEL3": RHEL3, "RHEL4": RHEL4, "RHEL5": RHEL5, "RHEL6": RHEL6
84}
85
86def stringToVersion(s):
87 """Convert string into one of the provided version constants. Raises
88 KickstartVersionError if string does not match anything.
89 """
90 # First try these short forms.
91 try:
92 return versionMap[s.upper()]
93 except KeyError:
94 pass
95
96 # Now try the Fedora versions.
97 m = re.match("^fedora.* (\d+)$", s, re.I)
98
99 if m and m.group(1):
100 if versionMap.has_key("FC" + m.group(1)):
101 return versionMap["FC" + m.group(1)]
102 elif versionMap.has_key("F" + m.group(1)):
103 return versionMap["F" + m.group(1)]
104 else:
105 raise KickstartVersionError(_("Unsupported version specified: %s") % s)
106
107 # Now try the RHEL versions.
108 m = re.match("^red hat enterprise linux.* (\d+)([\.\d]*)$", s, re.I)
109
110 if m and m.group(1):
111 if versionMap.has_key("RHEL" + m.group(1)):
112 return versionMap["RHEL" + m.group(1)]
113 else:
114 raise KickstartVersionError(_("Unsupported version specified: %s") % s)
115
116 # If nothing else worked, we're out of options.
117 raise KickstartVersionError(_("Unsupported version specified: %s") % s)
118
119def versionToString(version, skipDevel=False):
120 """Convert version into a string representation of the version number.
121 This is the reverse operation of stringToVersion. Raises
122 KickstartVersionError if version does not match anything.
123 """
124 if not skipDevel and version == versionMap["DEVEL"]:
125 return "DEVEL"
126
127 for (key, val) in versionMap.iteritems():
128 if key == "DEVEL":
129 continue
130 elif val == version:
131 return key
132
133 raise KickstartVersionError(_("Unsupported version specified: %s") % version)
134
135def versionFromFile(f):
136 """Given a file or URL, look for a line starting with #version= and
137 return the version number. If no version is found, return DEVEL.
138 """
139 v = DEVEL
140
141 fh = urlopen(f)
142
143 while True:
144 try:
145 l = fh.readline()
146 except StopIteration:
147 break
148
149 # At the end of the file?
150 if l == "":
151 break
152
153 if l.isspace() or l.strip() == "":
154 continue
155
156 if l[:9] == "#version=":
157 v = stringToVersion(l[9:].rstrip())
158 break
159
160 fh.close()
161 return v
162
163def returnClassForVersion(version=DEVEL):
164 """Return the class of the syntax handler for version. version can be
165 either a string or the matching constant. Raises KickstartValueError
166 if version does not match anything.
167 """
168 try:
169 version = int(version)
170 module = "%s" % versionToString(version, skipDevel=True)
171 except ValueError:
172 module = "%s" % version
173 version = stringToVersion(version)
174
175 module = module.lower()
176
177 try:
178 import pykickstart.handlers
179 sys.path.extend(pykickstart.handlers.__path__)
180 found = imputil.imp.find_module(module)
181 loaded = imputil.imp.load_module(module, found[0], found[1], found[2])
182
183 for (k, v) in loaded.__dict__.iteritems():
184 if k.lower().endswith("%shandler" % module):
185 return v
186 except:
187 raise KickstartVersionError(_("Unsupported version specified: %s") % version)
188
189def makeVersion(version=DEVEL):
190 """Return a new instance of the syntax handler for version. version can be
191 either a string or the matching constant. This function is useful for
192 standalone programs which just need to handle a specific version of
193 kickstart syntax (as provided by a command line argument, for example)
194 and need to instantiate the correct object.
195 """
196 cl = returnClassForVersion(version)
197 return cl()