1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
import apt_inst, apt_pkg
import apt
import sys
import os
from gettext import gettext as _
class DebPackage(object):
debug = 0
def __init__(self, cache, file):
cache.clear()
self._cache = cache
self.file = file
self._needPkgs = None
# read the deb
control = apt_inst.debExtractControl(open(file))
self._sections = apt_pkg.ParseSection(control)
self.pkgName = self._sections["Package"]
def _isOrGroupSatisfied(self, or_group):
""" this function gets a 'or_group' and analyzes if
at least one dependency of this group is already satisfied """
self._dbg(2,"_checkOrGroup(): %s " % (or_group))
for dep in or_group:
depname = dep[0]
ver = dep[1]
oper = dep[2]
# check for virtual pkgs
if not self._cache.has_key(depname):
if self._cache.isVirtualPkg(depname):
#print "%s is virtual" % depname
for pkg in self._cache.getProvidersForVirtual(depname):
if pkg.isInstalled:
return True
continue
inst = self._cache[depname]
instver = inst.installedVersion
if instver != None and apt_pkg.CheckDep(instver,oper,ver) == True:
return True
return False
def _satisfyOrGroup(self, or_group):
""" try to satisfy the or_group """
or_found = False
virtual_pkg = None
for dep in or_group:
depname = dep[0]
ver = dep[1]
oper = dep[2]
if not self._cache.has_key(depname):
if self._cache.isVirtualPkg(depname):
virtual_pkg = depname
continue
# now check if we can satisfy the deps with the candidate(s)
# in the cache
cand = self._cache[depname]
candver = self._cache._depcache.GetCandidateVer(cand._pkg)
if not candver:
continue
if not apt_pkg.CheckDep(candver.VerStr,oper,ver):
continue
# check if we need to install it
self._dbg(2,"Need to get: %s" % depname)
self._needPkgs.append(depname)
return True
# check if this or group was ok
or_str = ""
for dep in or_group:
or_str += dep[0]
if dep != or_group[len(or_group)-1]:
or_str += "|"
self._failureString += _("Dependency is not satisfiable: %s\n" % or_str)
return False
def _checkSinglePkgConflict(self, pkgname, ver, oper):
""" returns true if a pkg conflicts with a real installed/marked
pkg """
pkgver = None
cand = self._cache[pkgname]
if cand.isInstalled:
pkgver = cand.installedVersion
elif cand.markedInstall:
pkgver = cand.candidateVersion
#print "pkg: %s" % pkgname
#print "ver: %s" % ver
#print "pkgver: %s " % pkgver
#print "oper: %s " % oper
if pkgver and apt_pkg.CheckDep(pkgver,oper,ver):
self._failureString += _("Conflicts with the installed package '%s'" % cand.name)
return True
return False
def _checkConflictsOrGroup(self, or_group):
""" check the or-group for conflicts with installed pkgs """
self._dbg(2,"_checkConflictsOrGroup(): %s " % (or_group))
or_found = False
virtual_pkg = None
for dep in or_group:
depname = dep[0]
ver = dep[1]
oper = dep[2]
# FIXME: conflicts with virutal pkgs needs to be
# checked!
if not self._cache.has_key(depname):
if self._cache.isVirtualPkg(depname):
for pkg in self._cache.getProvidersForVirtual(depname):
#print "conflicts virtual check: %s" % pkg.name
if self._checkSinglePkgConflict(pkg.name,ver,oper):
return True
continue
if self._checkSinglePkgConflict(depname,ver,oper):
return True
return False
def checkConflicts(self):
""" check if the pkg conflicts with a existing or to be installed
package. Return True if the pkg is ok """
key = "Conflicts"
if self._sections.has_key(key):
conflicts = apt_pkg.ParseDepends(self._sections[key])
for or_group in conflicts:
if self._checkConflictsOrGroup(or_group):
#print "Conflicts with a exisiting pkg!"
#self._failureString = "Conflicts with a exisiting pkg!"
return False
return True
# some constants
(NO_VERSION,
VERSION_OUTDATED,
VERSION_SAME,
VERSION_IS_NEWER) = range(4)
def compareToVersionInCache(self, useInstalled=True):
""" checks if the pkg is already installed or availabe in the cache
and if so in what version, returns if the version of the deb
is not available,older,same,newer
"""
self._dbg(3,"compareToVersionInCache")
pkgname = self._sections["Package"]
debver = self._sections["Version"]
self._dbg(1,"debver: %s" % debver)
if self._cache.has_key(pkgname):
if useInstalled:
cachever = self._cache[pkgname].installedVersion
else:
cachever = self._cache[pkgname].candidateVersion
if cachever != None:
cmp = apt_pkg.VersionCompare(cachever,debver)
self._dbg(1, "CompareVersion(debver,instver): %s" % cmp)
if cmp == 0:
return self.VERSION_SAME
elif cmp < 0:
return self.VERSION_IS_NEWER
elif cmp > 0:
return self.VERSION_OUTDATED
return self.NO_VERSION
def checkDeb(self):
self._dbg(3,"checkDepends")
# init
self._needPkgs = []
depends = []
# check arch
arch = self._sections["Architecture"]
if arch != "all" and arch != apt_pkg.CPU:
self._dbg(1,"ERROR: Wrong architecture dude!")
self._failureString = _("Wrong architecture '%s'" % arch)
return False
# check version
res = self.compareToVersionInCache()
if res == self.VERSION_OUTDATED: # the deb is older than the installed
self._failureString = _("A later version is already installed")
return False
# FIXME: this sort of error handling sux
self._failureString = ""
# check conflicts
if not self.checkConflicts():
return False
# find depends
for key in ["Depends","PreDepends"]:
if self._sections.has_key(key):
depends.extend(apt_pkg.ParseDepends(self._sections[key]))
# check depends
for or_group in depends:
#print "or_group: %s" % or_group
#print "or_group satified: %s" % self._isOrGroupSatisfied(or_group)
if not self._isOrGroupSatisfied(or_group):
if not self._satisfyOrGroup(or_group):
return False
# now try it out in the cache
for pkg in self._needPkgs:
try:
self._cache[pkg].markInstall()
except SystemError:
self._failureString = _("Cannot install '%s'" % pkg)
self._cache.clear()
return False
# check for conflicts again (this time with the packages that are
# makeed for install)
if not self.checkConflicts():
return False
if self._cache._depcache.BrokenCount > 0:
self._failureString = _("Failed to satisfy all dependencies (broken cache)")
# clean the cache again
self._cache.clear()
return False
return True
def missingDeps(self):
self._dbg(1, "Installing: %s" % self._needPkgs)
if self._needPkgs == None:
self.checkDeb()
return self._needPkgs
missingDeps = property(missingDeps)
def requiredChanges(self):
install = []
remove = []
unauthenticated = []
for pkg in self._cache:
if pkg.markedInstall or pkg.markedUpgrade:
install.append(pkg.name)
# check authentication, one authenticated origin is enough
# libapt will skip non-authenticated origins then
authenticated = False
for origin in pkg.candidateOrigin:
authenticated |= origin.trusted
if not authenticated:
unauthenticated.append(pkg.name)
if pkg.markedDelete:
remove.append(pkg.name)
return (install,remove, unauthenticated)
requiredChanges = property(requiredChanges)
def filelist(self):
""" return the list of files in the deb """
files = []
def extract_cb(What,Name,Link,Mode,UID,GID,Size,MTime,Major,Minor):
#print "%s '%s','%s',%u,%u,%u,%u,%u,%u,%u"\
# % (What,Name,Link,Mode,UID,GID,Size, MTime, Major, Minor)
files.append(Name)
apt_inst.debExtract(open(self.file), extract_cb, "data.tar.gz")
return files
filelist = property(filelist)
# properties
def __getitem__(self,item):
if not self._sections.has_key(item):
# Translators: it's for missing entries in the deb package,
# e.g. a missing "Maintainer" field
return _("%s is not available" % item)
return self._sections[item]
def _dbg(self, level, msg):
"""Write debugging output to sys.stderr.
"""
if level <= self.debug:
print >> sys.stderr, msg
class MyCache(apt.Cache):
""" helper to provide some additonal functions """
def clear(self):
""" unmark all pkgs """
self._depcache.Init()
def isVirtualPkg(self, pkgname):
""" this function returns true if pkgname is a virtual
pkg """
try:
virtual_pkg = self._cache[pkgname]
except KeyError:
return False
if len(virtual_pkg.VersionList) == 0:
return True
return False
def downloadable(self, pkg, useCandidate=True):
" check if the given pkg can be downloaded "
if useCandidate:
ver = self._depcache.GetCandidateVer(pkg._pkg)
else:
ver = pkg._pkg.CurrentVer
if ver == None:
return False
return ver.Downloadable
def getProvidersForVirtual(self, virtual_pkg):
providers = []
try:
vp = self._cache[virtual_pkg]
if len(vp.VersionList) != 0:
return providers
except IndexError:
return providers
for pkg in self:
v = self._depcache.GetCandidateVer(pkg._pkg)
if v == None:
continue
for p in v.ProvidesList:
#print virtual_pkg
#print p[0]
if virtual_pkg == p[0]:
# we found a pkg that provides this virtual
# pkg, check if the proivdes is any good
providers.append(pkg)
#cand = self._cache[pkg.name]
#candver = self._cache._depcache.GetCandidateVer(cand._pkg)
#instver = cand._pkg.CurrentVer
#res = apt_pkg.CheckDep(candver.VerStr,oper,ver)
#if res == True:
# self._dbg(1,"we can use %s" % pkg.name)
# or_found = True
# break
return providers
if __name__ == "__main__":
cache = MyCache()
vp = "www-browser"
print "%s virtual: %s" % (vp,cache.isVirtualPkg(vp))
providers = cache.getProvidersForVirtual(vp)
print "Providers for %s :" % vp
for pkg in providers:
print " %s" % pkg.name
d = DebPackage(cache, sys.argv[1])
print "Deb: %s" % d.pkgName
if not d.checkDeb():
print "can't be satified"
print d._failureString
print "missing deps: %s" % d.missingDeps
print d.requiredChanges
|
