forked from Debian/apt
-
Notifications
You must be signed in to change notification settings - Fork 0
/
acquire-item.cc
4067 lines (3799 loc) · 143 KB
/
acquire-item.cc
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
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
Acquire Item - Item to acquire
Each item can download to exactly one file at a time. This means you
cannot create an item that fetches two uri's to two files at the same
time. The pkgAcqIndex class creates a second class upon instantiation
to fetch the other index files because of this.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/acquire-worker.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/gpgv.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/indexfile.h>
#include <apt-pkg/metaindex.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/pkgrecords.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/tagfile.h>
#include <algorithm>
#include <ctime>
#include <chrono>
#include <iostream>
#include <memory>
#include <numeric>
#include <random>
#include <sstream>
#include <string>
#include <unordered_set>
#include <vector>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <apti18n.h>
/*}}}*/
using namespace std;
static std::string GetPartialFileName(std::string const &file) /*{{{*/
{
std::string DestFile = _config->FindDir("Dir::State::lists") + "partial/";
DestFile += file;
return DestFile;
}
/*}}}*/
static std::string GetPartialFileNameFromURI(std::string const &uri) /*{{{*/
{
return GetPartialFileName(URItoFileName(uri));
}
/*}}}*/
static std::string GetFinalFileNameFromURI(std::string const &uri) /*{{{*/
{
return _config->FindDir("Dir::State::lists") + URItoFileName(uri);
}
/*}}}*/
static std::string GetKeepCompressedFileName(std::string file, IndexTarget const &Target)/*{{{*/
{
if (Target.KeepCompressed == false)
return file;
std::string const KeepCompressedAs = Target.Option(IndexTarget::KEEPCOMPRESSEDAS);
if (KeepCompressedAs.empty() == false)
{
std::string const ext = KeepCompressedAs.substr(0, KeepCompressedAs.find(' '));
if (ext != "uncompressed")
file.append(".").append(ext);
}
return file;
}
/*}}}*/
static std::string GetMergeDiffsPatchFileName(std::string const &Final, std::string const &Patch)/*{{{*/
{
// rred expects the patch as $FinalFile.ed.$patchname.gz
return Final + ".ed." + Patch + ".gz";
}
/*}}}*/
static std::string GetDiffsPatchFileName(std::string const &Final) /*{{{*/
{
// rred expects the patch as $FinalFile.ed
return Final + ".ed";
}
/*}}}*/
static std::string GetExistingFilename(std::string const &File) /*{{{*/
{
if (RealFileExists(File))
return File;
for (auto const &type : APT::Configuration::getCompressorExtensions())
{
std::string const Final = File + type;
if (RealFileExists(Final))
return Final;
}
return "";
}
/*}}}*/
static std::string GetDiffIndexFileName(std::string const &Name) /*{{{*/
{
return Name + ".diff/Index";
}
/*}}}*/
static std::string GetDiffIndexURI(IndexTarget const &Target) /*{{{*/
{
return Target.URI + ".diff/Index";
}
/*}}}*/
static void ReportMirrorFailureToCentral(pkgAcquire::Item const &I, std::string const &FailCode, std::string const &Details)/*{{{*/
{
// we only act if a mirror was used at all
if(I.UsedMirror.empty())
return;
#if 0
std::cerr << "\nReportMirrorFailure: "
<< UsedMirror
<< " Uri: " << DescURI()
<< " FailCode: "
<< FailCode << std::endl;
#endif
string const report = _config->Find("Methods::Mirror::ProblemReporting",
LIBEXEC_DIR "/apt-report-mirror-failure");
if(!FileExists(report))
return;
std::vector<char const*> const Args = {
report.c_str(),
I.UsedMirror.c_str(),
I.DescURI().c_str(),
FailCode.c_str(),
Details.c_str(),
NULL
};
pid_t pid = ExecFork();
if(pid < 0)
{
_error->Error("ReportMirrorFailure Fork failed");
return;
}
else if(pid == 0)
{
execvp(Args[0], (char**)Args.data());
std::cerr << "Could not exec " << Args[0] << std::endl;
_exit(100);
}
if(!ExecWait(pid, "report-mirror-failure"))
_error->Warning("Couldn't report problem to '%s'", report.c_str());
}
/*}}}*/
static APT_NONNULL(2) bool MessageInsecureRepository(bool const isError, char const * const msg, std::string const &repo)/*{{{*/
{
std::string m;
strprintf(m, msg, repo.c_str());
if (isError)
{
_error->Error("%s", m.c_str());
_error->Notice("%s", _("Updating from such a repository can't be done securely, and is therefore disabled by default."));
}
else
{
_error->Warning("%s", m.c_str());
_error->Notice("%s", _("Data from such a repository can't be authenticated and is therefore potentially dangerous to use."));
}
_error->Notice("%s", _("See apt-secure(8) manpage for repository creation and user configuration details."));
return false;
}
/*}}}*/
// AllowInsecureRepositories /*{{{*/
enum class InsecureType { UNSIGNED, WEAK, NORELEASE };
static bool TargetIsAllowedToBe(IndexTarget const &Target, InsecureType const type)
{
if (_config->FindB("Acquire::AllowInsecureRepositories"))
return true;
if (Target.OptionBool(IndexTarget::ALLOW_INSECURE))
return true;
switch (type)
{
case InsecureType::UNSIGNED: break;
case InsecureType::NORELEASE: break;
case InsecureType::WEAK:
if (_config->FindB("Acquire::AllowWeakRepositories"))
return true;
if (Target.OptionBool(IndexTarget::ALLOW_WEAK))
return true;
break;
}
return false;
}
static bool APT_NONNULL(3, 4, 5) AllowInsecureRepositories(InsecureType const msg, std::string const &repo,
metaIndex const * const MetaIndexParser, pkgAcqMetaClearSig * const TransactionManager, pkgAcquire::Item * const I)
{
// we skip weak downgrades as its unlikely that a repository gets really weaker –
// its more realistic that apt got pickier in a newer version
if (msg != InsecureType::WEAK)
{
std::string const FinalInRelease = TransactionManager->GetFinalFilename();
std::string const FinalReleasegpg = FinalInRelease.substr(0, FinalInRelease.length() - strlen("InRelease")) + "Release.gpg";
if (RealFileExists(FinalReleasegpg) || RealFileExists(FinalInRelease))
{
char const * msgstr = nullptr;
switch (msg)
{
case InsecureType::UNSIGNED: msgstr = _("The repository '%s' is no longer signed."); break;
case InsecureType::NORELEASE: msgstr = _("The repository '%s' no longer has a Release file."); break;
case InsecureType::WEAK: /* unreachable */ break;
}
if (_config->FindB("Acquire::AllowDowngradeToInsecureRepositories") ||
TransactionManager->Target.OptionBool(IndexTarget::ALLOW_DOWNGRADE_TO_INSECURE))
{
// meh, the users wants to take risks (we still mark the packages
// from this repository as unauthenticated)
_error->Warning(msgstr, repo.c_str());
_error->Warning(_("This is normally not allowed, but the option "
"Acquire::AllowDowngradeToInsecureRepositories was "
"given to override it."));
} else {
MessageInsecureRepository(true, msgstr, repo);
TransactionManager->AbortTransaction();
I->Status = pkgAcquire::Item::StatError;
return false;
}
}
}
if(MetaIndexParser->GetTrusted() == metaIndex::TRI_YES)
return true;
char const * msgstr = nullptr;
switch (msg)
{
case InsecureType::UNSIGNED: msgstr = _("The repository '%s' is not signed."); break;
case InsecureType::NORELEASE: msgstr = _("The repository '%s' does not have a Release file."); break;
case InsecureType::WEAK: msgstr = _("The repository '%s' provides only weak security information."); break;
}
if (TargetIsAllowedToBe(TransactionManager->Target, msg) == true)
{
MessageInsecureRepository(false, msgstr, repo);
return true;
}
MessageInsecureRepository(true, msgstr, repo);
TransactionManager->AbortTransaction();
I->Status = pkgAcquire::Item::StatError;
return false;
}
/*}}}*/
static HashStringList GetExpectedHashesFromFor(metaIndex * const Parser, std::string const &MetaKey)/*{{{*/
{
if (Parser == NULL)
return HashStringList();
metaIndex::checkSum * const R = Parser->Lookup(MetaKey);
if (R == NULL)
return HashStringList();
return R->Hashes;
}
/*}}}*/
class pkgAcquire::Item::Private /*{{{*/
{
public:
struct AlternateURI
{
std::string URI;
std::unordered_map<std::string, std::string> changefields;
AlternateURI(std::string &&u, decltype(changefields) &&cf) : URI(u), changefields(cf) {}
};
std::list<AlternateURI> AlternativeURIs;
std::vector<std::string> BadAlternativeSites;
std::vector<std::string> PastRedirections;
std::unordered_map<std::string, std::string> CustomFields;
time_point FetchAfter = {};
Private()
{
}
};
/*}}}*/
// all ::HashesRequired and ::GetExpectedHashes implementations /*{{{*/
/* ::GetExpectedHashes is abstract and has to be implemented by all subclasses.
It is best to implement it as broadly as possible, while ::HashesRequired defaults
to true and should be as restrictive as possible for false cases. Note that if
a hash is returned by ::GetExpectedHashes it must match. Only if it doesn't
::HashesRequired is called to evaluate if its okay to have no hashes. */
APT_PURE bool pkgAcqTransactionItem::HashesRequired() const
{
/* signed repositories obviously have a parser and good hashes.
unsigned repositories, too, as even if we can't trust them for security,
we can at least trust them for integrity of the download itself.
Only repositories without a Release file can (obviously) not have
hashes – and they are very uncommon and strongly discouraged */
if (TransactionManager->MetaIndexParser->GetLoadedSuccessfully() != metaIndex::TRI_YES)
return false;
if (TargetIsAllowedToBe(Target, InsecureType::WEAK))
{
/* If we allow weak hashes, we check that we have some (weak) and then
declare hashes not needed. That will tip us in the right direction
as if hashes exist, they will be used, even if not required */
auto const hsl = GetExpectedHashes();
if (hsl.usable())
return true;
if (hsl.empty() == false)
return false;
}
return true;
}
HashStringList pkgAcqTransactionItem::GetExpectedHashes() const
{
return GetExpectedHashesFor(GetMetaKey());
}
APT_PURE bool pkgAcqMetaBase::HashesRequired() const
{
// Release and co have no hashes 'by design'.
return false;
}
HashStringList pkgAcqMetaBase::GetExpectedHashes() const
{
return HashStringList();
}
APT_PURE bool pkgAcqIndexDiffs::HashesRequired() const
{
/* We can't check hashes of rred result as we don't know what the
hash of the file will be. We just know the hash of the patch(es),
the hash of the file they will apply on and the hash of the resulting
file. */
if (State == StateFetchDiff)
return true;
return false;
}
HashStringList pkgAcqIndexDiffs::GetExpectedHashes() const
{
if (State == StateFetchDiff)
return available_patches[0].download_hashes;
return HashStringList();
}
APT_PURE bool pkgAcqIndexMergeDiffs::HashesRequired() const
{
/* @see #pkgAcqIndexDiffs::HashesRequired, with the difference that
we can check the rred result after all patches are applied as
we know the expected result rather than potentially apply more patches */
if (State == StateFetchDiff)
return true;
return State == StateApplyDiff;
}
HashStringList pkgAcqIndexMergeDiffs::GetExpectedHashes() const
{
if (State == StateFetchDiff)
return patch.download_hashes;
else if (State == StateApplyDiff)
return GetExpectedHashesFor(Target.MetaKey);
return HashStringList();
}
APT_PURE bool pkgAcqArchive::HashesRequired() const
{
return LocalSource == false;
}
HashStringList pkgAcqArchive::GetExpectedHashes() const
{
// figured out while parsing the records
return ExpectedHashes;
}
APT_PURE bool pkgAcqFile::HashesRequired() const
{
// supplied as parameter at creation time, so the caller decides
return ExpectedHashes.usable();
}
HashStringList pkgAcqFile::GetExpectedHashes() const
{
return ExpectedHashes;
}
/*}}}*/
// Acquire::Item::QueueURI and specialisations from child classes /*{{{*/
bool pkgAcquire::Item::QueueURI(pkgAcquire::ItemDesc &Item)
{
Owner->Enqueue(Item);
return true;
}
/* The idea here is that an item isn't queued if it exists on disk and the
transition manager was a hit as this means that the files it contains
the checksums for can't be updated either (or they are and we are asking
for a hashsum mismatch to happen which helps nobody) */
bool pkgAcqTransactionItem::QueueURI(pkgAcquire::ItemDesc &Item)
{
if (TransactionManager->State != TransactionStarted)
{
if (_config->FindB("Debug::Acquire::Transaction", false))
std::clog << "Skip " << Target.URI << " as transaction was already dealt with!" << std::endl;
return false;
}
std::string const FinalFile = GetFinalFilename();
if (TransactionManager->IMSHit == true && FileExists(FinalFile) == true)
{
PartialFile = DestFile = FinalFile;
Status = StatDone;
return false;
}
// this ensures we rewrite only once and only the first step
auto const OldBaseURI = Target.Option(IndexTarget::BASE_URI);
if (OldBaseURI.empty() || APT::String::Startswith(Item.URI, OldBaseURI) == false)
return pkgAcquire::Item::QueueURI(Item);
// the given URI is our last resort
PushAlternativeURI(std::string(Item.URI), {}, false);
// If we got the InRelease file via a mirror, pick all indexes directly from this mirror, too
std::string SameMirrorURI;
if (TransactionManager->BaseURI.empty() == false && TransactionManager->UsedMirror.empty() == false &&
URI::SiteOnly(Item.URI) != URI::SiteOnly(TransactionManager->BaseURI))
{
auto ExtraPath = Item.URI.substr(OldBaseURI.length());
auto newURI = flCombine(TransactionManager->BaseURI, std::move(ExtraPath));
if (IsGoodAlternativeURI(newURI))
{
SameMirrorURI = std::move(newURI);
PushAlternativeURI(std::string(SameMirrorURI), {}, false);
}
}
// add URI and by-hash based on it
if (AcquireByHash())
{
// if we use the mirror transport, ask it for by-hash uris
// we need to stick to the same mirror only for non-unique filenames
auto const sameMirrorException = [&]() {
if (Item.URI.find("mirror") == std::string::npos)
return false;
::URI uri(Item.URI);
return uri.Access == "mirror" || APT::String::Startswith(uri.Access, "mirror+") ||
APT::String::Endswith(uri.Access, "+mirror") || uri.Access.find("+mirror+") != std::string::npos;
}();
if (sameMirrorException)
SameMirrorURI.clear();
// now add the actual by-hash uris
auto const Expected = GetExpectedHashes();
auto const TargetHash = Expected.find(nullptr);
auto const PushByHashURI = [&](std::string U) {
if (unlikely(TargetHash == nullptr))
return false;
auto const trailing_slash = U.find_last_of("/");
if (unlikely(trailing_slash == std::string::npos))
return false;
auto byhashSuffix = "/by-hash/" + TargetHash->HashType() + "/" + TargetHash->HashValue();
U.replace(trailing_slash, U.length() - trailing_slash, std::move(byhashSuffix));
PushAlternativeURI(std::move(U), {}, false);
return true;
};
PushByHashURI(Item.URI);
if (SameMirrorURI.empty() == false && PushByHashURI(SameMirrorURI) == false)
SameMirrorURI.clear();
}
// the last URI added is the first one tried
if (unlikely(PopAlternativeURI(Item.URI) == false))
return false;
if (SameMirrorURI.empty() == false)
{
UsedMirror = TransactionManager->UsedMirror;
if (Item.Description.find(" ") != string::npos)
Item.Description.replace(0, Item.Description.find(" "), UsedMirror);
}
return pkgAcquire::Item::QueueURI(Item);
}
/* The transition manager InRelease itself (or its older sisters-in-law
Release & Release.gpg) is always queued as this allows us to rerun gpgv
on it to verify that we aren't stalled with old files */
bool pkgAcqMetaBase::QueueURI(pkgAcquire::ItemDesc &Item)
{
return pkgAcquire::Item::QueueURI(Item);
}
/* the Diff/Index needs to queue also the up-to-date complete index file
to ensure that the list cleaner isn't eating it */
bool pkgAcqDiffIndex::QueueURI(pkgAcquire::ItemDesc &Item)
{
if (pkgAcqTransactionItem::QueueURI(Item) == true)
return true;
QueueOnIMSHit();
return false;
}
/*}}}*/
// Acquire::Item::GetFinalFilename and specialisations for child classes /*{{{*/
std::string pkgAcquire::Item::GetFinalFilename() const
{
// Beware: Desc.URI is modified by redirections
return GetFinalFileNameFromURI(Desc.URI);
}
std::string pkgAcqDiffIndex::GetFinalFilename() const
{
std::string const FinalFile = GetFinalFileNameFromURI(GetDiffIndexURI(Target));
// we don't want recompress, so lets keep whatever we got
if (CurrentCompressionExtension == "uncompressed")
return FinalFile;
return FinalFile + "." + CurrentCompressionExtension;
}
std::string pkgAcqIndex::GetFinalFilename() const
{
std::string const FinalFile = GetFinalFileNameFromURI(Target.URI);
return GetKeepCompressedFileName(FinalFile, Target);
}
std::string pkgAcqMetaSig::GetFinalFilename() const
{
return GetFinalFileNameFromURI(Target.URI);
}
std::string pkgAcqBaseIndex::GetFinalFilename() const
{
return GetFinalFileNameFromURI(Target.URI);
}
std::string pkgAcqMetaBase::GetFinalFilename() const
{
return GetFinalFileNameFromURI(Target.URI);
}
std::string pkgAcqArchive::GetFinalFilename() const
{
return _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
}
/*}}}*/
// pkgAcqTransactionItem::GetMetaKey and specialisations for child classes /*{{{*/
std::string pkgAcqTransactionItem::GetMetaKey() const
{
return Target.MetaKey;
}
std::string pkgAcqIndex::GetMetaKey() const
{
if (Stage == STAGE_DECOMPRESS_AND_VERIFY || CurrentCompressionExtension == "uncompressed")
return Target.MetaKey;
return Target.MetaKey + "." + CurrentCompressionExtension;
}
std::string pkgAcqDiffIndex::GetMetaKey() const
{
auto const metakey = GetDiffIndexFileName(Target.MetaKey);
if (CurrentCompressionExtension == "uncompressed")
return metakey;
return metakey + "." + CurrentCompressionExtension;
}
/*}}}*/
//pkgAcqTransactionItem::TransactionState and specialisations for child classes /*{{{*/
bool pkgAcqTransactionItem::TransactionState(TransactionStates const state)
{
bool const Debug = _config->FindB("Debug::Acquire::Transaction", false);
switch(state)
{
case TransactionStarted: _error->Fatal("Item %s changed to invalid transaction start state!", Target.URI.c_str()); break;
case TransactionAbort:
if(Debug == true)
std::clog << " Cancel: " << DestFile << std::endl;
if (Status == pkgAcquire::Item::StatIdle)
{
Status = pkgAcquire::Item::StatDone;
Dequeue();
}
break;
case TransactionCommit:
if(PartialFile.empty() == false)
{
bool sameFile = (PartialFile == DestFile);
// we use symlinks on IMS-Hit to avoid copies
if (RealFileExists(DestFile))
{
struct stat Buf;
if (lstat(PartialFile.c_str(), &Buf) != -1)
{
if (S_ISLNK(Buf.st_mode) && Buf.st_size > 0)
{
char partial[Buf.st_size + 1];
ssize_t const sp = readlink(PartialFile.c_str(), partial, Buf.st_size);
if (sp == -1)
_error->Errno("pkgAcqTransactionItem::TransactionState-sp", _("Failed to readlink %s"), PartialFile.c_str());
else
{
partial[sp] = '\0';
sameFile = (DestFile == partial);
}
}
}
else
_error->Errno("pkgAcqTransactionItem::TransactionState-stat", _("Failed to stat %s"), PartialFile.c_str());
}
if (sameFile == false)
{
// ensure that even without lists-cleanup all compressions are nuked
std::string FinalFile = GetFinalFileNameFromURI(Target.URI);
if (FileExists(FinalFile))
{
if(Debug == true)
std::clog << "rm " << FinalFile << " # " << DescURI() << std::endl;
if (RemoveFile("TransactionStates-Cleanup", FinalFile) == false)
return false;
}
for (auto const &ext: APT::Configuration::getCompressorExtensions())
{
auto const Final = FinalFile + ext;
if (FileExists(Final))
{
if(Debug == true)
std::clog << "rm " << Final << " # " << DescURI() << std::endl;
if (RemoveFile("TransactionStates-Cleanup", Final) == false)
return false;
}
}
if(Debug == true)
std::clog << "mv " << PartialFile << " -> "<< DestFile << " # " << DescURI() << std::endl;
if (Rename(PartialFile, DestFile) == false)
return false;
}
else if(Debug == true)
std::clog << "keep " << PartialFile << " # " << DescURI() << std::endl;
} else {
if(Debug == true)
std::clog << "rm " << DestFile << " # " << DescURI() << std::endl;
if (RemoveFile("TransItem::TransactionCommit", DestFile) == false)
return false;
}
break;
}
return true;
}
bool pkgAcqMetaBase::TransactionState(TransactionStates const state)
{
// Do not remove InRelease on IMSHit of Release.gpg [yes, this is very edgecasey]
if (TransactionManager->IMSHit == false)
return pkgAcqTransactionItem::TransactionState(state);
return true;
}
bool pkgAcqIndex::TransactionState(TransactionStates const state)
{
if (pkgAcqTransactionItem::TransactionState(state) == false)
return false;
switch (state)
{
case TransactionStarted: _error->Fatal("AcqIndex %s changed to invalid transaction start state!", Target.URI.c_str()); break;
case TransactionAbort:
if (Stage == STAGE_DECOMPRESS_AND_VERIFY)
{
// keep the compressed file, but drop the decompressed
EraseFileName.clear();
if (PartialFile.empty() == false && flExtension(PartialFile) != CurrentCompressionExtension)
RemoveFile("TransactionAbort", PartialFile);
}
break;
case TransactionCommit:
if (EraseFileName.empty() == false)
RemoveFile("AcqIndex::TransactionCommit", EraseFileName);
break;
}
return true;
}
bool pkgAcqDiffIndex::TransactionState(TransactionStates const state)
{
if (pkgAcqTransactionItem::TransactionState(state) == false)
return false;
switch (state)
{
case TransactionStarted: _error->Fatal("Item %s changed to invalid transaction start state!", Target.URI.c_str()); break;
case TransactionCommit:
break;
case TransactionAbort:
std::string const Partial = GetPartialFileNameFromURI(Target.URI);
RemoveFile("TransactionAbort", Partial);
break;
}
return true;
}
/*}}}*/
// pkgAcqTransactionItem::AcquireByHash and specialisations for child classes /*{{{*/
bool pkgAcqTransactionItem::AcquireByHash() const
{
if (TransactionManager->MetaIndexParser == nullptr)
return false;
auto const useByHashConf = Target.Option(IndexTarget::BY_HASH);
if (useByHashConf == "force")
return true;
return StringToBool(useByHashConf) == true && TransactionManager->MetaIndexParser->GetSupportsAcquireByHash();
}
// pdiff patches have a unique name already, no need for by-hash
bool pkgAcqIndexMergeDiffs::AcquireByHash() const
{
return false;
}
bool pkgAcqIndexDiffs::AcquireByHash() const
{
return false;
}
/*}}}*/
class APT_HIDDEN NoActionItem : public pkgAcquire::Item /*{{{*/
/* The sole purpose of this class is having an item which does nothing to
reach its done state to prevent cleanup deleting the mentioned file.
Handy in cases in which we know we have the file already, like IMS-Hits. */
{
IndexTarget const Target;
public:
virtual std::string DescURI() const APT_OVERRIDE {return Target.URI;};
virtual HashStringList GetExpectedHashes() const APT_OVERRIDE {return HashStringList();};
NoActionItem(pkgAcquire * const Owner, IndexTarget const &Target) :
pkgAcquire::Item(Owner), Target(Target)
{
Status = StatDone;
DestFile = GetFinalFileNameFromURI(Target.URI);
}
NoActionItem(pkgAcquire * const Owner, IndexTarget const &Target, std::string const &FinalFile) :
pkgAcquire::Item(Owner), Target(Target)
{
Status = StatDone;
DestFile = FinalFile;
}
};
/*}}}*/
class APT_HIDDEN CleanupItem : public pkgAcqTransactionItem /*{{{*/
/* This class ensures that a file which was configured but isn't downloaded
for various reasons isn't kept in an old version in the lists directory.
In a way its the reverse of NoActionItem as it helps with removing files
even if the lists-cleanup is deactivated. */
{
public:
virtual std::string DescURI() const APT_OVERRIDE {return Target.URI;};
virtual HashStringList GetExpectedHashes() const APT_OVERRIDE {return HashStringList();};
CleanupItem(pkgAcquire * const Owner, pkgAcqMetaClearSig * const TransactionManager, IndexTarget const &Target) :
pkgAcqTransactionItem(Owner, TransactionManager, Target)
{
Status = StatDone;
DestFile = GetFinalFileNameFromURI(Target.URI);
}
bool TransactionState(TransactionStates const state) APT_OVERRIDE
{
switch (state)
{
case TransactionStarted:
break;
case TransactionAbort:
break;
case TransactionCommit:
if (_config->FindB("Debug::Acquire::Transaction", false) == true)
std::clog << "rm " << DestFile << " # " << DescURI() << std::endl;
if (RemoveFile("TransItem::TransactionCommit", DestFile) == false)
return false;
break;
}
return true;
}
};
/*}}}*/
// Acquire::Item::Item - Constructor /*{{{*/
pkgAcquire::Item::Item(pkgAcquire * const owner) :
FileSize(0), PartialSize(0), ID(0), Complete(false), Local(false),
QueueCounter(0), ExpectedAdditionalItems(0), Retries(_config->FindI("Acquire::Retries", 3)), Owner(owner), d(new Private())
{
Owner->Add(this);
Status = StatIdle;
}
/*}}}*/
// Acquire::Item::~Item - Destructor /*{{{*/
pkgAcquire::Item::~Item()
{
Owner->Remove(this);
delete d;
}
/*}}}*/
std::string pkgAcquire::Item::Custom600Headers() const /*{{{*/
{
std::ostringstream header;
for (auto const &f : d->CustomFields)
if (f.second.empty() == false)
header << '\n'
<< f.first << ": " << f.second;
return header.str();
}
/*}}}*/
std::unordered_map<std::string, std::string> &pkgAcquire::Item::ModifyCustomFields() /*{{{*/
{
return d->CustomFields;
}
/*}}}*/
bool pkgAcquire::Item::PopAlternativeURI(std::string &NewURI) /*{{{*/
{
if (d->AlternativeURIs.empty())
return false;
auto const AltUri = d->AlternativeURIs.front();
d->AlternativeURIs.pop_front();
NewURI = AltUri.URI;
auto &CustomFields = ModifyCustomFields();
for (auto const &f : AltUri.changefields)
{
if (f.second.empty())
CustomFields.erase(f.first);
else
CustomFields[f.first] = f.second;
}
return true;
}
/*}}}*/
bool pkgAcquire::Item::IsGoodAlternativeURI(std::string const &AltUri) const/*{{{*/
{
return std::find(d->PastRedirections.cbegin(), d->PastRedirections.cend(), AltUri) == d->PastRedirections.cend() &&
std::find(d->BadAlternativeSites.cbegin(), d->BadAlternativeSites.cend(), URI::SiteOnly(AltUri)) == d->BadAlternativeSites.cend();
}
/*}}}*/
void pkgAcquire::Item::PushAlternativeURI(std::string &&NewURI, std::unordered_map<std::string, std::string> &&fields, bool const at_the_back) /*{{{*/
{
if (IsGoodAlternativeURI(NewURI) == false)
return;
if (at_the_back)
d->AlternativeURIs.emplace_back(std::move(NewURI), std::move(fields));
else
d->AlternativeURIs.emplace_front(std::move(NewURI), std::move(fields));
}
/*}}}*/
void pkgAcquire::Item::RemoveAlternativeSite(std::string &&OldSite) /*{{{*/
{
d->AlternativeURIs.erase(std::remove_if(d->AlternativeURIs.begin(), d->AlternativeURIs.end(),
[&](decltype(*d->AlternativeURIs.cbegin()) AltUri) {
return URI::SiteOnly(AltUri.URI) == OldSite;
}),
d->AlternativeURIs.end());
d->BadAlternativeSites.push_back(std::move(OldSite));
}
/*}}}*/
std::string pkgAcquire::Item::ShortDesc() const /*{{{*/
{
return DescURI();
}
/*}}}*/
void pkgAcquire::Item::Finished() /*{{{*/
{
}
/*}}}*/
APT_PURE pkgAcquire * pkgAcquire::Item::GetOwner() const /*{{{*/
{
return Owner;
}
/*}}}*/
APT_PURE pkgAcquire::ItemDesc &pkgAcquire::Item::GetItemDesc() /*{{{*/
{
return Desc;
}
/*}}}*/
APT_PURE bool pkgAcquire::Item::IsTrusted() const /*{{{*/
{
return false;
}
/*}}}*/
// Acquire::Item::Failed - Item failed to download /*{{{*/
// ---------------------------------------------------------------------
/* We return to an idle state if there are still other queues that could
fetch this object */
static void formatHashsum(std::ostream &out, HashString const &hs)
{
auto const type = hs.HashType();
if (type == "Checksum-FileSize")
out << " - Filesize";
else
out << " - " << type;
out << ':' << hs.HashValue();
if (hs.usable() == false)
out << " [weak]";
out << std::endl;
}
void pkgAcquire::Item::Failed(string const &Message,pkgAcquire::MethodConfig const * const Cnf)
{
if (QueueCounter <= 1)
{
/* This indicates that the file is not available right now but might
be sometime later. If we do a retry cycle then this should be
retried [CDROMs] */
if (Cnf != NULL && Cnf->LocalOnly == true &&
StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
{
Status = StatIdle;
Dequeue();
return;
}
switch (Status)
{
case StatIdle:
case StatFetching:
case StatDone:
Status = StatError;
break;
case StatAuthError:
case StatError:
case StatTransientNetworkError:
break;
}
Complete = false;
Dequeue();
}
FailMessage(Message);
if (QueueCounter > 1)
Status = StatIdle;
}
void pkgAcquire::Item::FailMessage(string const &Message)
{
string const FailReason = LookupTag(Message, "FailReason");
enum { MAXIMUM_SIZE_EXCEEDED, HASHSUM_MISMATCH, WEAK_HASHSUMS, REDIRECTION_LOOP, OTHER } failreason = OTHER;
if ( FailReason == "MaximumSizeExceeded")
failreason = MAXIMUM_SIZE_EXCEEDED;
else if ( FailReason == "WeakHashSums")
failreason = WEAK_HASHSUMS;
else if (FailReason == "RedirectionLoop")
failreason = REDIRECTION_LOOP;
else if (Status == StatAuthError)
failreason = HASHSUM_MISMATCH;
if(ErrorText.empty())
{
std::ostringstream out;
switch (failreason)
{
case HASHSUM_MISMATCH:
out << _("Hash Sum mismatch") << std::endl;
break;
case WEAK_HASHSUMS:
out << _("Insufficient information available to perform this download securely") << std::endl;
break;
case REDIRECTION_LOOP:
out << "Redirection loop encountered" << std::endl;
break;
case MAXIMUM_SIZE_EXCEEDED:
out << LookupTag(Message, "Message") << std::endl;
break;
case OTHER:
out << LookupTag(Message, "Message");
break;
}
if (Status == StatAuthError)
{
auto const ExpectedHashes = GetExpectedHashes();
if (ExpectedHashes.empty() == false)
{
out << "Hashes of expected file:" << std::endl;
for (auto const &hs: ExpectedHashes)
formatHashsum(out, hs);
}
if (failreason == HASHSUM_MISMATCH)
{
out << "Hashes of received file:" << std::endl;
for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
{
std::string const tagname = std::string(*type) + "-Hash";
std::string const hashsum = LookupTag(Message, tagname.c_str());
if (hashsum.empty() == false)
formatHashsum(out, HashString(*type, hashsum));
}
}
auto const lastmod = LookupTag(Message, "Last-Modified", "");
if (lastmod.empty() == false)
out << "Last modification reported: " << lastmod << std::endl;
}
ErrorText = out.str();
}
switch (failreason)
{
case MAXIMUM_SIZE_EXCEEDED: RenameOnError(MaximumSizeExceeded); break;
case HASHSUM_MISMATCH: RenameOnError(HashSumMismatch); break;
case WEAK_HASHSUMS: break;
case REDIRECTION_LOOP: break;
case OTHER: break;
}
if (FailReason.empty() == false)
ReportMirrorFailureToCentral(*this, FailReason, ErrorText);
else
ReportMirrorFailureToCentral(*this, ErrorText, ErrorText);
}
/*}}}*/
// Acquire::Item::Start - Item has begun to download /*{{{*/
// ---------------------------------------------------------------------