summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/siggen.py
blob: 578ba5d6612d6e249c2f9ad46874b65ea8c65dea (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
#
# SPDX-License-Identifier: GPL-2.0-only
#

import hashlib
import logging
import os
import re
import tempfile
import pickle
import bb.data
import difflib
import simplediff
import json
import bb.compress.zstd
from bb.checksum import FileChecksumCache
from bb import runqueue
import hashserv
import hashserv.client

logger = logging.getLogger('BitBake.SigGen')
hashequiv_logger = logging.getLogger('BitBake.SigGen.HashEquiv')

class SetEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, set):
            return dict(_set_object=list(sorted(obj)))
        return json.JSONEncoder.default(self, obj)

def SetDecoder(dct):
    if '_set_object' in dct:
        return set(dct['_set_object'])
    return dct

def init(d):
    siggens = [obj for obj in globals().values()
                      if type(obj) is type and issubclass(obj, SignatureGenerator)]

    desired = d.getVar("BB_SIGNATURE_HANDLER") or "noop"
    for sg in siggens:
        if desired == sg.name:
            return sg(d)
            break
    else:
        logger.error("Invalid signature generator '%s', using default 'noop'\n"
                     "Available generators: %s", desired,
                     ', '.join(obj.name for obj in siggens))
        return SignatureGenerator(d)

class SignatureGenerator(object):
    """
    """
    name = "noop"

    # If the derived class supports multiconfig datacaches, set this to True
    # The default is False for backward compatibility with derived signature
    # generators that do not understand multiconfig caches
    supports_multiconfig_datacaches = False

    def __init__(self, data):
        self.basehash = {}
        self.taskhash = {}
        self.unihash = {}
        self.runtaskdeps = {}
        self.file_checksum_values = {}
        self.taints = {}
        self.unitaskhashes = {}
        self.tidtopn = {}
        self.setscenetasks = set()

    def finalise(self, fn, d, varient):
        return

    def postparsing_clean_cache(self):
        return

    def get_unihash(self, tid):
        return self.taskhash[tid]

    def prep_taskhash(self, tid, deps, dataCaches):
        return

    def get_taskhash(self, tid, deps, dataCaches):
        self.taskhash[tid] = hashlib.sha256(tid.encode("utf-8")).hexdigest()
        return self.taskhash[tid]

    def writeout_file_checksum_cache(self):
        """Write/update the file checksum cache onto disk"""
        return

    def stampfile(self, stampbase, file_name, taskname, extrainfo):
        return ("%s.%s.%s" % (stampbase, taskname, extrainfo)).rstrip('.')

    def stampcleanmask(self, stampbase, file_name, taskname, extrainfo):
        return ("%s.%s.%s" % (stampbase, taskname, extrainfo)).rstrip('.')

    def dump_sigtask(self, fn, task, stampbase, runtime):
        return

    def invalidate_task(self, task, d, fn):
        bb.build.del_stamp(task, d, fn)

    def dump_sigs(self, dataCache, options):
        return

    def get_taskdata(self):
        return (self.runtaskdeps, self.taskhash, self.unihash, self.file_checksum_values, self.taints, self.basehash, self.unitaskhashes, self.tidtopn, self.setscenetasks)

    def set_taskdata(self, data):
        self.runtaskdeps, self.taskhash, self.unihash, self.file_checksum_values, self.taints, self.basehash, self.unitaskhashes, self.tidtopn, self.setscenetasks = data

    def reset(self, data):
        self.__init__(data)

    def get_taskhashes(self):
        return self.taskhash, self.unihash, self.unitaskhashes, self.tidtopn

    def set_taskhashes(self, hashes):
        self.taskhash, self.unihash, self.unitaskhashes, self.tidtopn = hashes

    def save_unitaskhashes(self):
        return

    def set_setscene_tasks(self, setscene_tasks):
        return

    @classmethod
    def get_data_caches(cls, dataCaches, mc):
        """
        This function returns the datacaches that should be passed to signature
        generator functions. If the signature generator supports multiconfig
        caches, the entire dictionary of data caches is sent, otherwise a
        special proxy is sent that support both index access to all
        multiconfigs, and also direct access for the default multiconfig.

        The proxy class allows code in this class itself to always use
        multiconfig aware code (to ease maintenance), but derived classes that
        are unaware of multiconfig data caches can still access the default
        multiconfig as expected.

        Do not override this function in derived classes; it will be removed in
        the future when support for multiconfig data caches is mandatory
        """
        class DataCacheProxy(object):
            def __init__(self):
                pass

            def __getitem__(self, key):
                return dataCaches[key]

            def __getattr__(self, name):
                return getattr(dataCaches[mc], name)

        if cls.supports_multiconfig_datacaches:
            return dataCaches

        return DataCacheProxy()

class SignatureGeneratorBasic(SignatureGenerator):
    """
    """
    name = "basic"

    def __init__(self, data):
        self.basehash = {}
        self.taskhash = {}
        self.unihash = {}
        self.taskdeps = {}
        self.runtaskdeps = {}
        self.file_checksum_values = {}
        self.taints = {}
        self.gendeps = {}
        self.lookupcache = {}
        self.setscenetasks = set()
        self.basewhitelist = set((data.getVar("BB_HASHBASE_WHITELIST") or "").split())
        self.taskwhitelist = None
        self.init_rundepcheck(data)
        checksum_cache_file = data.getVar("BB_HASH_CHECKSUM_CACHE_FILE")
        if checksum_cache_file:
            self.checksum_cache = FileChecksumCache()
            self.checksum_cache.init_cache(data, checksum_cache_file)
        else:
            self.checksum_cache = None

        self.unihash_cache = bb.cache.SimpleCache("3")
        self.unitaskhashes = self.unihash_cache.init_cache(data, "bb_unihashes.dat", {})
        self.localdirsexclude = (data.getVar("BB_SIGNATURE_LOCAL_DIRS_EXCLUDE") or "CVS .bzr .git .hg .osc .p4 .repo .svn").split()
        self.tidtopn = {}

    def init_rundepcheck(self, data):
        self.taskwhitelist = data.getVar("BB_HASHTASK_WHITELIST") or None
        if self.taskwhitelist:
            self.twl = re.compile(self.taskwhitelist)
        else:
            self.twl = None

    def _build_data(self, fn, d):

        ignore_mismatch = ((d.getVar("BB_HASH_IGNORE_MISMATCH") or '') == '1')
        tasklist, gendeps, lookupcache = bb.data.generate_dependencies(d, self.basewhitelist)

        taskdeps, basehash = bb.data.generate_dependency_hash(tasklist, gendeps, lookupcache, self.basewhitelist, fn)

        for task in tasklist:
            tid = fn + ":" + task
            if not ignore_mismatch and tid in self.basehash and self.basehash[tid] != basehash[tid]:
                bb.error("When reparsing %s, the basehash value changed from %s to %s. The metadata is not deterministic and this needs to be fixed." % (tid, self.basehash[tid], basehash[tid]))
                bb.error("The following commands may help:")
                cmd = "$ bitbake %s -c%s" % (d.getVar('PN'), task)
                # Make sure sigdata is dumped before run printdiff
                bb.error("%s -Snone" % cmd)
                bb.error("Then:")
                bb.error("%s -Sprintdiff\n" % cmd)
            self.basehash[tid] = basehash[tid]

        self.taskdeps[fn] = taskdeps
        self.gendeps[fn] = gendeps
        self.lookupcache[fn] = lookupcache

        return taskdeps

    def set_setscene_tasks(self, setscene_tasks):
        self.setscenetasks = set(setscene_tasks)

    def finalise(self, fn, d, variant):

        mc = d.getVar("__BBMULTICONFIG", False) or ""
        if variant or mc:
            fn = bb.cache.realfn2virtual(fn, variant, mc)

        try:
            taskdeps = self._build_data(fn, d)
        except bb.parse.SkipRecipe:
            raise
        except:
            bb.warn("Error during finalise of %s" % fn)
            raise

        #Slow but can be useful for debugging mismatched basehashes
        #for task in self.taskdeps[fn]:
        #    self.dump_sigtask(fn, task, d.getVar("STAMP"), False)

        for task in taskdeps:
            d.setVar("BB_BASEHASH:task-%s" % task, self.basehash[fn + ":" + task])

    def postparsing_clean_cache(self):
        #
        # After parsing we can remove some things from memory to reduce our memory footprint
        #
        self.gendeps = {}
        self.lookupcache = {}
        self.taskdeps = {}

    def rundep_check(self, fn, recipename, task, dep, depname, dataCaches):
        # Return True if we should keep the dependency, False to drop it
        # We only manipulate the dependencies for packages not in the whitelist
        if self.twl and not self.twl.search(recipename):
            # then process the actual dependencies
            if self.twl.search(depname):
                return False
        return True

    def read_taint(self, fn, task, stampbase):
        taint = None
        try:
            with open(stampbase + '.' + task + '.taint', 'r') as taintf:
                taint = taintf.read()
        except IOError:
            pass
        return taint

    def prep_taskhash(self, tid, deps, dataCaches):

        (mc, _, task, fn) = bb.runqueue.split_tid_mcfn(tid)

        self.basehash[tid] = dataCaches[mc].basetaskhash[tid]
        self.runtaskdeps[tid] = []
        self.file_checksum_values[tid] = []
        recipename = dataCaches[mc].pkg_fn[fn]

        self.tidtopn[tid] = recipename

        for dep in sorted(deps, key=clean_basepath):
            (depmc, _, _, depmcfn) = bb.runqueue.split_tid_mcfn(dep)
            depname = dataCaches[depmc].pkg_fn[depmcfn]
            if not self.supports_multiconfig_datacaches and mc != depmc:
                # If the signature generator doesn't understand multiconfig
                # data caches, any dependency not in the same multiconfig must
                # be skipped for backward compatibility
                continue
            if not self.rundep_check(fn, recipename, task, dep, depname, dataCaches):
                continue
            if dep not in self.taskhash:
                bb.fatal("%s is not in taskhash, caller isn't calling in dependency order?" % dep)
            self.runtaskdeps[tid].append(dep)

        if task in dataCaches[mc].file_checksums[fn]:
            if self.checksum_cache:
                checksums = self.checksum_cache.get_checksums(dataCaches[mc].file_checksums[fn][task], recipename, self.localdirsexclude)
            else:
                checksums = bb.fetch2.get_file_checksums(dataCaches[mc].file_checksums[fn][task], recipename, self.localdirsexclude)
            for (f,cs) in checksums:
                self.file_checksum_values[tid].append((f,cs))

        taskdep = dataCaches[mc].task_deps[fn]
        if 'nostamp' in taskdep and task in taskdep['nostamp']:
            # Nostamp tasks need an implicit taint so that they force any dependent tasks to run
            if tid in self.taints and self.taints[tid].startswith("nostamp:"):
                # Don't reset taint value upon every call
                pass
            else:
                import uuid
                taint = str(uuid.uuid4())
                self.taints[tid] = "nostamp:" + taint

        taint = self.read_taint(fn, task, dataCaches[mc].stamp[fn])
        if taint:
            self.taints[tid] = taint
            logger.warning("%s is tainted from a forced run" % tid)

        return

    def get_taskhash(self, tid, deps, dataCaches):

        data = self.basehash[tid]
        for dep in self.runtaskdeps[tid]:
            data = data + self.get_unihash(dep)

        for (f, cs) in self.file_checksum_values[tid]:
            if cs:
                data = data + cs

        if tid in self.taints:
            if self.taints[tid].startswith("nostamp:"):
                data = data + self.taints[tid][8:]
            else:
                data = data + self.taints[tid]

        h = hashlib.sha256(data.encode("utf-8")).hexdigest()
        self.taskhash[tid] = h
        #d.setVar("BB_TASKHASH:task-%s" % task, taskhash[task])
        return h

    def writeout_file_checksum_cache(self):
        """Write/update the file checksum cache onto disk"""
        if self.checksum_cache:
            self.checksum_cache.save_extras()
            self.checksum_cache.save_merge()
        else:
            bb.fetch2.fetcher_parse_save()
            bb.fetch2.fetcher_parse_done()

    def save_unitaskhashes(self):
        self.unihash_cache.save(self.unitaskhashes)

    def dump_sigtask(self, fn, task, stampbase, runtime):

        tid = fn + ":" + task
        referencestamp = stampbase
        if isinstance(runtime, str) and runtime.startswith("customfile"):
            sigfile = stampbase
            referencestamp = runtime[11:]
        elif runtime and tid in self.taskhash:
            sigfile = stampbase + "." + task + ".sigdata" + "." + self.get_unihash(tid)
        else:
            sigfile = stampbase + "." + task + ".sigbasedata" + "." + self.basehash[tid]

        with bb.utils.umask(0o002):
            bb.utils.mkdirhier(os.path.dirname(sigfile))

        data = {}
        data['task'] = task
        data['basewhitelist'] = self.basewhitelist
        data['taskwhitelist'] = self.taskwhitelist
        data['taskdeps'] = self.taskdeps[fn][task]
        data['basehash'] = self.basehash[tid]
        data['gendeps'] = {}
        data['varvals'] = {}
        data['varvals'][task] = self.lookupcache[fn][task]
        for dep in self.taskdeps[fn][task]:
            if dep in self.basewhitelist:
                continue
            data['gendeps'][dep] = self.gendeps[fn][dep]
            data['varvals'][dep] = self.lookupcache[fn][dep]

        if runtime and tid in self.taskhash:
            data['runtaskdeps'] = self.runtaskdeps[tid]
            data['file_checksum_values'] = [(os.path.basename(f), cs) for f,cs in self.file_checksum_values[tid]]
            data['runtaskhashes'] = {}
            for dep in data['runtaskdeps']:
                data['runtaskhashes'][dep] = self.get_unihash(dep)
            data['taskhash'] = self.taskhash[tid]
            data['unihash'] = self.get_unihash(tid)

        taint = self.read_taint(fn, task, referencestamp)
        if taint:
            data['taint'] = taint

        if runtime and tid in self.taints:
            if 'nostamp:' in self.taints[tid]:
                data['taint'] = self.taints[tid]

        computed_basehash = calc_basehash(data)
        if computed_basehash != self.basehash[tid]:
            bb.error("Basehash mismatch %s versus %s for %s" % (computed_basehash, self.basehash[tid], tid))
        if runtime and tid in self.taskhash:
            computed_taskhash = calc_taskhash(data)
            if computed_taskhash != self.taskhash[tid]:
                bb.error("Taskhash mismatch %s versus %s for %s" % (computed_taskhash, self.taskhash[tid], tid))
                sigfile = sigfile.replace(self.taskhash[tid], computed_taskhash)

        fd, tmpfile = tempfile.mkstemp(dir=os.path.dirname(sigfile), prefix="sigtask.")
        try:
            with bb.compress.zstd.open(fd, "wt", encoding="utf-8", num_threads=1) as f:
                json.dump(data, f, sort_keys=True, separators=(",", ":"), cls=SetEncoder)
                f.flush()
            os.chmod(tmpfile, 0o664)
            bb.utils.rename(tmpfile, sigfile)
        except (OSError, IOError) as err:
            try:
                os.unlink(tmpfile)
            except OSError:
                pass
            raise err

    def dump_sigfn(self, fn, dataCaches, options):
        if fn in self.taskdeps:
            for task in self.taskdeps[fn]:
                tid = fn + ":" + task
                mc = bb.runqueue.mc_from_tid(tid)
                if tid not in self.taskhash:
                    continue
                if dataCaches[mc].basetaskhash[tid] != self.basehash[tid]:
                    bb.error("Bitbake's cached basehash does not match the one we just generated (%s)!" % tid)
                    bb.error("The mismatched hashes were %s and %s" % (dataCaches[mc].basetaskhash[tid], self.basehash[tid]))
                self.dump_sigtask(fn, task, dataCaches[mc].stamp[fn], True)

class SignatureGeneratorBasicHash(SignatureGeneratorBasic):
    name = "basichash"

    def get_stampfile_hash(self, tid):
        if tid in self.taskhash:
            return self.taskhash[tid]

        # If task is not in basehash, then error
        return self.basehash[tid]

    def stampfile(self, stampbase, fn, taskname, extrainfo, clean=False):
        if taskname != "do_setscene" and taskname.endswith("_setscene"):
            tid = fn + ":" + taskname[:-9]
        else:
            tid = fn + ":" + taskname
        if clean:
            h = "*"
        else:
            h = self.get_stampfile_hash(tid)

        return ("%s.%s.%s.%s" % (stampbase, taskname, h, extrainfo)).rstrip('.')

    def stampcleanmask(self, stampbase, fn, taskname, extrainfo):
        return self.stampfile(stampbase, fn, taskname, extrainfo, clean=True)

    def invalidate_task(self, task, d, fn):
        bb.note("Tainting hash to force rebuild of task %s, %s" % (fn, task))
        bb.build.write_taint(task, d, fn)

class SignatureGeneratorUniHashMixIn(object):
    def __init__(self, data):
        self.extramethod = {}
        super().__init__(data)

    def get_taskdata(self):
        return (self.server, self.method, self.extramethod) + super().get_taskdata()

    def set_taskdata(self, data):
        self.server, self.method, self.extramethod = data[:3]
        super().set_taskdata(data[3:])

    def client(self):
        if getattr(self, '_client', None) is None:
            self._client = hashserv.create_client(self.server)
        return self._client

    def get_stampfile_hash(self, tid):
        if tid in self.taskhash:
            # If a unique hash is reported, use it as the stampfile hash. This
            # ensures that if a task won't be re-run if the taskhash changes,
            # but it would result in the same output hash
            unihash = self._get_unihash(tid)
            if unihash is not None:
                return unihash

        return super().get_stampfile_hash(tid)

    def set_unihash(self, tid, unihash):
        (mc, fn, taskname, taskfn) = bb.runqueue.split_tid_mcfn(tid)
        key = mc + ":" + self.tidtopn[tid] + ":" + taskname
        self.unitaskhashes[key] = (self.taskhash[tid], unihash)
        self.unihash[tid] = unihash

    def _get_unihash(self, tid, checkkey=None):
        if tid not in self.tidtopn:
            return None
        (mc, fn, taskname, taskfn) = bb.runqueue.split_tid_mcfn(tid)
        key = mc + ":" + self.tidtopn[tid] + ":" + taskname
        if key not in self.unitaskhashes:
            return None
        if not checkkey:
            checkkey = self.taskhash[tid]
        (key, unihash) = self.unitaskhashes[key]
        if key != checkkey:
            return None
        return unihash

    def get_unihash(self, tid):
        taskhash = self.taskhash[tid]

        # If its not a setscene task we can return
        if self.setscenetasks and tid not in self.setscenetasks:
            self.unihash[tid] = None
            return taskhash

        # TODO: This cache can grow unbounded. It probably only needs to keep
        # for each task
        unihash =  self._get_unihash(tid)
        if unihash is not None:
            self.unihash[tid] = unihash
            return unihash

        # In the absence of being able to discover a unique hash from the
        # server, make it be equivalent to the taskhash. The unique "hash" only
        # really needs to be a unique string (not even necessarily a hash), but
        # making it match the taskhash has a few advantages:
        #
        # 1) All of the sstate code that assumes hashes can be the same
        # 2) It provides maximal compatibility with builders that don't use
        #    an equivalency server
        # 3) The value is easy for multiple independent builders to derive the
        #    same unique hash from the same input. This means that if the
        #    independent builders find the same taskhash, but it isn't reported
        #    to the server, there is a better chance that they will agree on
        #    the unique hash.
        unihash = taskhash

        try:
            method = self.method
            if tid in self.extramethod:
                method = method + self.extramethod[tid]
            data = self.client().get_unihash(method, self.taskhash[tid])
            if data:
                unihash = data
                # A unique hash equal to the taskhash is not very interesting,
                # so it is reported it at debug level 2. If they differ, that
                # is much more interesting, so it is reported at debug level 1
                hashequiv_logger.debug((1, 2)[unihash == taskhash], 'Found unihash %s in place of %s for %s from %s' % (unihash, taskhash, tid, self.server))
            else:
                hashequiv_logger.debug2('No reported unihash for %s:%s from %s' % (tid, taskhash, self.server))
        except ConnectionError as e:
            bb.warn('Error contacting Hash Equivalence Server %s: %s' % (self.server, str(e)))

        self.set_unihash(tid, unihash)
        self.unihash[tid] = unihash
        return unihash

    def report_unihash(self, path, task, d):
        import importlib

        taskhash = d.getVar('BB_TASKHASH')
        unihash = d.getVar('BB_UNIHASH')
        report_taskdata = d.getVar('SSTATE_HASHEQUIV_REPORT_TASKDATA') == '1'
        tempdir = d.getVar('T')
        fn = d.getVar('BB_FILENAME')
        tid = fn + ':do_' + task
        key = tid + ':' + taskhash

        if self.setscenetasks and tid not in self.setscenetasks:
            return

        # This can happen if locked sigs are in action. Detect and just abort
        if taskhash != self.taskhash[tid]:
            return

        # Sanity checks
        cache_unihash = self._get_unihash(tid, checkkey=taskhash)
        if cache_unihash is None:
            bb.fatal('%s not in unihash cache. Please report this error' % key)

        if cache_unihash != unihash:
            bb.fatal("Cache unihash %s doesn't match BB_UNIHASH %s" % (cache_unihash, unihash))

        sigfile = None
        sigfile_name = "depsig.do_%s.%d" % (task, os.getpid())
        sigfile_link = "depsig.do_%s" % task

        try:
            sigfile = open(os.path.join(tempdir, sigfile_name), 'w+b')

            locs = {'path': path, 'sigfile': sigfile, 'task': task, 'd': d}

            if "." in self.method:
                (module, method) = self.method.rsplit('.', 1)
                locs['method'] = getattr(importlib.import_module(module), method)
                outhash = bb.utils.better_eval('method(path, sigfile, task, d)', locs)
            else:
                outhash = bb.utils.better_eval(self.method + '(path, sigfile, task, d)', locs)

            try:
                extra_data = {}

                owner = d.getVar('SSTATE_HASHEQUIV_OWNER')
                if owner:
                    extra_data['owner'] = owner

                if report_taskdata:
                    sigfile.seek(0)

                    extra_data['PN'] = d.getVar('PN')
                    extra_data['PV'] = d.getVar('PV')
                    extra_data['PR'] = d.getVar('PR')
                    extra_data['task'] = task
                    extra_data['outhash_siginfo'] = sigfile.read().decode('utf-8')

                method = self.method
                if tid in self.extramethod:
                    method = method + self.extramethod[tid]

                data = self.client().report_unihash(taskhash, method, outhash, unihash, extra_data)
                new_unihash = data['unihash']

                if new_unihash != unihash:
                    hashequiv_logger.debug('Task %s unihash changed %s -> %s by server %s' % (taskhash, unihash, new_unihash, self.server))
                    bb.event.fire(bb.runqueue.taskUniHashUpdate(fn + ':do_' + task, new_unihash), d)
                    self.set_unihash(tid, new_unihash)
                    d.setVar('BB_UNIHASH', new_unihash)
                else:
                    hashequiv_logger.debug('Reported task %s as unihash %s to %s' % (taskhash, unihash, self.server))
            except ConnectionError as e:
                bb.warn('Error contacting Hash Equivalence Server %s: %s' % (self.server, str(e)))
        finally:
            if sigfile:
                sigfile.close()

                sigfile_link_path = os.path.join(tempdir, sigfile_link)
                bb.utils.remove(sigfile_link_path)

                try:
                    os.symlink(sigfile_name, sigfile_link_path)
                except OSError:
                    pass

    def report_unihash_equiv(self, tid, taskhash, wanted_unihash, current_unihash, datacaches):
        try:
            extra_data = {}
            method = self.method
            if tid in self.extramethod:
                method = method + self.extramethod[tid]

            data = self.client().report_unihash_equiv(taskhash, method, wanted_unihash, extra_data)
            hashequiv_logger.verbose('Reported task %s as unihash %s to %s (%s)' % (tid, wanted_unihash, self.server, str(data)))

            if data is None:
                bb.warn("Server unable to handle unihash report")
                return False

            finalunihash = data['unihash']

            if finalunihash == current_unihash:
                hashequiv_logger.verbose('Task %s unihash %s unchanged by server' % (tid, finalunihash))
            elif finalunihash == wanted_unihash:
                hashequiv_logger.verbose('Task %s unihash changed %s -> %s as wanted' % (tid, current_unihash, finalunihash))
                self.set_unihash(tid, finalunihash)
                return True
            else:
                # TODO: What to do here?
                hashequiv_logger.verbose('Task %s unihash reported as unwanted hash %s' % (tid, finalunihash))

        except ConnectionError as e:
            bb.warn('Error contacting Hash Equivalence Server %s: %s' % (self.server, str(e)))

        return False

#
# Dummy class used for bitbake-selftest
#
class SignatureGeneratorTestEquivHash(SignatureGeneratorUniHashMixIn, SignatureGeneratorBasicHash):
    name = "TestEquivHash"
    def init_rundepcheck(self, data):
        super().init_rundepcheck(data)
        self.server = data.getVar('BB_HASHSERVE')
        self.method = "sstate_output_hash"

#
# Dummy class used for bitbake-selftest
#
class SignatureGeneratorTestMulticonfigDepends(SignatureGeneratorBasicHash):
    name = "TestMulticonfigDepends"
    supports_multiconfig_datacaches = True

def dump_this_task(outfile, d):
    import bb.parse
    fn = d.getVar("BB_FILENAME")
    task = "do_" + d.getVar("BB_CURRENTTASK")
    referencestamp = bb.build.stamp_internal(task, d, None, True)
    bb.parse.siggen.dump_sigtask(fn, task, outfile, "customfile:" + referencestamp)

def init_colors(enable_color):
    """Initialise colour dict for passing to compare_sigfiles()"""
    # First set up the colours
    colors = {'color_title':   '\033[1m',
              'color_default': '\033[0m',
              'color_add':     '\033[0;32m',
              'color_remove':  '\033[0;31m',
             }
    # Leave all keys present but clear the values
    if not enable_color:
        for k in colors.keys():
            colors[k] = ''
    return colors

def worddiff_str(oldstr, newstr, colors=None):
    if not colors:
        colors = init_colors(False)
    diff = simplediff.diff(oldstr.split(' '), newstr.split(' '))
    ret = []
    for change, value in diff:
        value = ' '.join(value)
        if change == '=':
            ret.append(value)
        elif change == '+':
            item = '{color_add}{{+{value}+}}{color_default}'.format(value=value, **colors)
            ret.append(item)
        elif change == '-':
            item = '{color_remove}[-{value}-]{color_default}'.format(value=value, **colors)
            ret.append(item)
    whitespace_note = ''
    if oldstr != newstr and ' '.join(oldstr.split()) == ' '.join(newstr.split()):
        whitespace_note = ' (whitespace changed)'
    return '"%s"%s' % (' '.join(ret), whitespace_note)

def list_inline_diff(oldlist, newlist, colors=None):
    if not colors:
        colors = init_colors(False)
    diff = simplediff.diff(oldlist, newlist)
    ret = []
    for change, value in diff:
        value = ' '.join(value)
        if change == '=':
            ret.append("'%s'" % value)
        elif change == '+':
            item = '{color_add}+{value}{color_default}'.format(value=value, **colors)
            ret.append(item)
        elif change == '-':
            item = '{color_remove}-{value}{color_default}'.format(value=value, **colors)
            ret.append(item)
    return '[%s]' % (', '.join(ret))

def clean_basepath(basepath):
    basepath, dir, recipe_task = basepath.rsplit("/", 2)
    cleaned = dir + '/' + recipe_task

    if basepath[0] == '/':
        return cleaned

    if basepath.startswith("mc:") and basepath.count(':') >= 2:
        mc, mc_name, basepath = basepath.split(":", 2)
        mc_suffix = ':mc:' + mc_name
    else:
        mc_suffix = ''

    # mc stuff now removed from basepath. Whatever was next, if present will be the first
    # suffix. ':/', recipe path start, marks the end of this. Something like
    # 'virtual:a[:b[:c]]:/path...' (b and c being optional)
    if basepath[0] != '/':
        cleaned += ':' + basepath.split(':/', 1)[0]

    return cleaned + mc_suffix

def clean_basepaths(a):
    b = {}
    for x in a:
        b[clean_basepath(x)] = a[x]
    return b

def clean_basepaths_list(a):
    b = []
    for x in a:
        b.append(clean_basepath(x))
    return b

def compare_sigfiles(a, b, recursecb=None, color=False, collapsed=False):
    output = []

    colors = init_colors(color)
    def color_format(formatstr, **values):
        """
        Return colour formatted string.
        NOTE: call with the format string, not an already formatted string
        containing values (otherwise you could have trouble with { and }
        characters)
        """
        if not formatstr.endswith('{color_default}'):
            formatstr += '{color_default}'
        # In newer python 3 versions you can pass both of these directly,
        # but we only require 3.4 at the moment
        formatparams = {}
        formatparams.update(colors)
        formatparams.update(values)
        return formatstr.format(**formatparams)

    with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
        a_data = json.load(f, object_hook=SetDecoder)
    with bb.compress.zstd.open(b, "rt", encoding="utf-8", num_threads=1) as f:
        b_data = json.load(f, object_hook=SetDecoder)

    def dict_diff(a, b, whitelist=set()):
        sa = set(a.keys())
        sb = set(b.keys())
        common = sa & sb
        changed = set()
        for i in common:
            if a[i] != b[i] and i not in whitelist:
                changed.add(i)
        added = sb - sa
        removed = sa - sb
        return changed, added, removed

    def file_checksums_diff(a, b):
        from collections import Counter

        # Convert lists back to tuples
        a = [(f[0], f[1]) for f in a]
        b = [(f[0], f[1]) for f in b]

        # Compare lists, ensuring we can handle duplicate filenames if they exist
        removedcount = Counter(a)
        removedcount.subtract(b)
        addedcount = Counter(b)
        addedcount.subtract(a)
        added = []
        for x in b:
            if addedcount[x] > 0:
                addedcount[x] -= 1
                added.append(x)
        removed = []
        changed = []
        for x in a:
            if removedcount[x] > 0:
                removedcount[x] -= 1
                for y in added:
                    if y[0] == x[0]:
                        changed.append((x[0], x[1], y[1]))
                        added.remove(y)
                        break
                else:
                    removed.append(x)
        added = [x[0] for x in added]
        removed = [x[0] for x in removed]
        return changed, added, removed

    if 'basewhitelist' in a_data and a_data['basewhitelist'] != b_data['basewhitelist']:
        output.append(color_format("{color_title}basewhitelist changed{color_default} from '%s' to '%s'") % (a_data['basewhitelist'], b_data['basewhitelist']))
        if a_data['basewhitelist'] and b_data['basewhitelist']:
            output.append("changed items: %s" % a_data['basewhitelist'].symmetric_difference(b_data['basewhitelist']))

    if 'taskwhitelist' in a_data and a_data['taskwhitelist'] != b_data['taskwhitelist']:
        output.append(color_format("{color_title}taskwhitelist changed{color_default} from '%s' to '%s'") % (a_data['taskwhitelist'], b_data['taskwhitelist']))
        if a_data['taskwhitelist'] and b_data['taskwhitelist']:
            output.append("changed items: %s" % a_data['taskwhitelist'].symmetric_difference(b_data['taskwhitelist']))

    if a_data['taskdeps'] != b_data['taskdeps']:
        output.append(color_format("{color_title}Task dependencies changed{color_default} from:\n%s\nto:\n%s") % (sorted(a_data['taskdeps']), sorted(b_data['taskdeps'])))

    if a_data['basehash'] != b_data['basehash'] and not collapsed:
        output.append(color_format("{color_title}basehash changed{color_default} from %s to %s") % (a_data['basehash'], b_data['basehash']))

    changed, added, removed = dict_diff(a_data['gendeps'], b_data['gendeps'], a_data['basewhitelist'] & b_data['basewhitelist'])
    if changed:
        for dep in sorted(changed):
            output.append(color_format("{color_title}List of dependencies for variable %s changed from '{color_default}%s{color_title}' to '{color_default}%s{color_title}'") % (dep, a_data['gendeps'][dep], b_data['gendeps'][dep]))
            if a_data['gendeps'][dep] and b_data['gendeps'][dep]:
                output.append("changed items: %s" % a_data['gendeps'][dep].symmetric_difference(b_data['gendeps'][dep]))
    if added:
        for dep in sorted(added):
            output.append(color_format("{color_title}Dependency on variable %s was added") % (dep))
    if removed:
        for dep in sorted(removed):
            output.append(color_format("{color_title}Dependency on Variable %s was removed") % (dep))


    changed, added, removed = dict_diff(a_data['varvals'], b_data['varvals'])
    if changed:
        for dep in sorted(changed):
            oldval = a_data['varvals'][dep]
            newval = b_data['varvals'][dep]
            if newval and oldval and ('\n' in oldval or '\n' in newval):
                diff = difflib.unified_diff(oldval.splitlines(), newval.splitlines(), lineterm='')
                # Cut off the first two lines, since we aren't interested in
                # the old/new filename (they are blank anyway in this case)
                difflines = list(diff)[2:]
                if color:
                    # Add colour to diff output
                    for i, line in enumerate(difflines):
                        if line.startswith('+'):
                            line = color_format('{color_add}{line}', line=line)
                            difflines[i] = line
                        elif line.startswith('-'):
                            line = color_format('{color_remove}{line}', line=line)
                            difflines[i] = line
                output.append(color_format("{color_title}Variable {var} value changed:{color_default}\n{diff}", var=dep, diff='\n'.join(difflines)))
            elif newval and oldval and (' ' in oldval or ' ' in newval):
                output.append(color_format("{color_title}Variable {var} value changed:{color_default}\n{diff}", var=dep, diff=worddiff_str(oldval, newval, colors)))
            else:
                output.append(color_format("{color_title}Variable {var} value changed from '{color_default}{oldval}{color_title}' to '{color_default}{newval}{color_title}'{color_default}", var=dep, oldval=oldval, newval=newval))

    if not 'file_checksum_values' in a_data:
         a_data['file_checksum_values'] = []
    if not 'file_checksum_values' in b_data:
         b_data['file_checksum_values'] = []

    changed, added, removed = file_checksums_diff(a_data['file_checksum_values'], b_data['file_checksum_values'])
    if changed:
        for f, old, new in changed:
            output.append(color_format("{color_title}Checksum for file %s changed{color_default} from %s to %s") % (f, old, new))
    if added:
        for f in added:
            output.append(color_format("{color_title}Dependency on checksum of file %s was added") % (f))
    if removed:
        for f in removed:
            output.append(color_format("{color_title}Dependency on checksum of file %s was removed") % (f))

    if not 'runtaskdeps' in a_data:
         a_data['runtaskdeps'] = {}
    if not 'runtaskdeps' in b_data:
         b_data['runtaskdeps'] = {}

    if not collapsed:
        if len(a_data['runtaskdeps']) != len(b_data['runtaskdeps']):
            changed = ["Number of task dependencies changed"]
        else:
            changed = []
            for idx, task in enumerate(a_data['runtaskdeps']):
                a = a_data['runtaskdeps'][idx]
                b = b_data['runtaskdeps'][idx]
                if a_data['runtaskhashes'][a] != b_data['runtaskhashes'][b] and not collapsed:
                    changed.append("%s with hash %s\n changed to\n%s with hash %s" % (clean_basepath(a), a_data['runtaskhashes'][a], clean_basepath(b), b_data['runtaskhashes'][b]))

        if changed:
            clean_a = clean_basepaths_list(a_data['runtaskdeps'])
            clean_b = clean_basepaths_list(b_data['runtaskdeps'])
            if clean_a != clean_b:
                output.append(color_format("{color_title}runtaskdeps changed:{color_default}\n%s") % list_inline_diff(clean_a, clean_b, colors))
            else:
                output.append(color_format("{color_title}runtaskdeps changed:"))
            output.append("\n".join(changed))


    if 'runtaskhashes' in a_data and 'runtaskhashes' in b_data:
        a = a_data['runtaskhashes']
        b = b_data['runtaskhashes']
        changed, added, removed = dict_diff(a, b)
        if added:
            for dep in sorted(added):
                bdep_found = False
                if removed:
                    for bdep in removed:
                        if b[dep] == a[bdep]:
                            #output.append("Dependency on task %s was replaced by %s with same hash" % (dep, bdep))
                            bdep_found = True
                if not bdep_found:
                    output.append(color_format("{color_title}Dependency on task %s was added{color_default} with hash %s") % (clean_basepath(dep), b[dep]))
        if removed:
            for dep in sorted(removed):
                adep_found = False
                if added:
                    for adep in added:
                        if b[adep] == a[dep]:
                            #output.append("Dependency on task %s was replaced by %s with same hash" % (adep, dep))
                            adep_found = True
                if not adep_found:
                    output.append(color_format("{color_title}Dependency on task %s was removed{color_default} with hash %s") % (clean_basepath(dep), a[dep]))
        if changed:
            for dep in sorted(changed):
                if not collapsed:
                    output.append(color_format("{color_title}Hash for dependent task %s changed{color_default} from %s to %s") % (clean_basepath(dep), a[dep], b[dep]))
                if callable(recursecb):
                    recout = recursecb(dep, a[dep], b[dep])
                    if recout:
                        if collapsed:
                            output.extend(recout)
                        else:
                            # If a dependent hash changed, might as well print the line above and then defer to the changes in
                            # that hash since in all likelyhood, they're the same changes this task also saw.
                            output = [output[-1]] + recout

    a_taint = a_data.get('taint', None)
    b_taint = b_data.get('taint', None)
    if a_taint != b_taint:
        if a_taint and a_taint.startswith('nostamp:'):
            a_taint = a_taint.replace('nostamp:', 'nostamp(uuid4):')
        if b_taint and b_taint.startswith('nostamp:'):
            b_taint = b_taint.replace('nostamp:', 'nostamp(uuid4):')
        output.append(color_format("{color_title}Taint (by forced/invalidated task) changed{color_default} from %s to %s") % (a_taint, b_taint))

    return output


def calc_basehash(sigdata):
    task = sigdata['task']
    basedata = sigdata['varvals'][task]

    if basedata is None:
        basedata = ''

    alldeps = sigdata['taskdeps']
    for dep in alldeps:
        basedata = basedata + dep
        val = sigdata['varvals'][dep]
        if val is not None:
            basedata = basedata + str(val)

    return hashlib.sha256(basedata.encode("utf-8")).hexdigest()

def calc_taskhash(sigdata):
    data = sigdata['basehash']

    for dep in sigdata['runtaskdeps']:
        data = data + sigdata['runtaskhashes'][dep]

    for c in sigdata['file_checksum_values']:
        if c[1]:
            data = data + c[1]

    if 'taint' in sigdata:
        if 'nostamp:' in sigdata['taint']:
            data = data + sigdata['taint'][8:]
        else:
            data = data + sigdata['taint']

    return hashlib.sha256(data.encode("utf-8")).hexdigest()


def dump_sigfile(a):
    output = []

    with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
        a_data = json.load(f, object_hook=SetDecoder)

    output.append("basewhitelist: %s" % (a_data['basewhitelist']))

    output.append("taskwhitelist: %s" % (a_data['taskwhitelist']))

    output.append("Task dependencies: %s" % (sorted(a_data['taskdeps'])))

    output.append("basehash: %s" % (a_data['basehash']))

    for dep in a_data['gendeps']:
        output.append("List of dependencies for variable %s is %s" % (dep, a_data['gendeps'][dep]))

    for dep in a_data['varvals']:
        output.append("Variable %s value is %s" % (dep, a_data['varvals'][dep]))

    if 'runtaskdeps' in a_data:
        output.append("Tasks this task depends on: %s" % (a_data['runtaskdeps']))

    if 'file_checksum_values' in a_data:
        output.append("This task depends on the checksums of files: %s" % (a_data['file_checksum_values']))

    if 'runtaskhashes' in a_data:
        for dep in a_data['runtaskhashes']:
            output.append("Hash for dependent task %s is %s" % (dep, a_data['runtaskhashes'][dep]))

    if 'taint' in a_data:
        if a_data['taint'].startswith('nostamp:'):
            msg = a_data['taint'].replace('nostamp:', 'nostamp(uuid4):')
        else:
            msg = a_data['taint']
        output.append("Tainted (by forced/invalidated task): %s" % msg)

    if 'task' in a_data:
        computed_basehash = calc_basehash(a_data)
        output.append("Computed base hash is %s and from file %s" % (computed_basehash, a_data['basehash']))
    else:
        output.append("Unable to compute base hash")

    computed_taskhash = calc_taskhash(a_data)
    output.append("Computed task hash is %s" % computed_taskhash)

    return output