aboutsummaryrefslogtreecommitdiffstats
path: root/scripts/lib/devtool/standard.py
blob: f19de27a86553de76b602e76278007f6abb7d94a (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
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
# Development tool - standard commands plugin
#
# Copyright (C) 2014-2015 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Devtool standard plugins"""

import os
import sys
import re
import shutil
import tempfile
import logging
import argparse
import argparse_oe
import scriptutils
import errno
import glob
from collections import OrderedDict
from devtool import exec_build_env_command, setup_tinfoil, check_workspace_recipe, use_external_build, setup_git_repo, recipe_to_append, get_bbclassextend_targets, DevtoolError
from devtool import parse_recipe

logger = logging.getLogger('devtool')


def add(args, config, basepath, workspace):
    """Entry point for the devtool 'add' subcommand"""
    import bb
    import oe.recipeutils

    if not args.recipename and not args.srctree and not args.fetch and not args.fetchuri:
        raise argparse_oe.ArgumentUsageError('At least one of recipename, srctree, fetchuri or -f/--fetch must be specified', 'add')

    # These are positional arguments, but because we're nice, allow
    # specifying e.g. source tree without name, or fetch URI without name or
    # source tree (if we can detect that that is what the user meant)
    if '://' in args.recipename:
        if not args.fetchuri:
            if args.fetch:
                raise DevtoolError('URI specified as positional argument as well as -f/--fetch')
            args.fetchuri = args.recipename
            args.recipename = ''
    elif '://' in args.srctree:
        if not args.fetchuri:
            if args.fetch:
                raise DevtoolError('URI specified as positional argument as well as -f/--fetch')
            args.fetchuri = args.srctree
            args.srctree = ''
    elif args.recipename and not args.srctree:
        if os.sep in args.recipename:
            args.srctree = args.recipename
            args.recipename = None
        elif os.path.isdir(args.recipename):
            logger.warn('Ambiguous argument %s - assuming you mean it to be the recipe name')

    if args.fetch:
        if args.fetchuri:
            raise DevtoolError('URI specified as positional argument as well as -f/--fetch')
        else:
            # FIXME should show a warning that -f/--fetch is deprecated here
            args.fetchuri = args.fetch

    if args.recipename:
        if args.recipename in workspace:
            raise DevtoolError("recipe %s is already in your workspace" %
                               args.recipename)
        reason = oe.recipeutils.validate_pn(args.recipename)
        if reason:
            raise DevtoolError(reason)

        # FIXME this ought to be in validate_pn but we're using that in other contexts
        if '/' in args.recipename:
            raise DevtoolError('"/" is not a valid character in recipe names')

    if args.srctree:
        srctree = os.path.abspath(args.srctree)
        srctreeparent = None
        tmpsrcdir = None
    else:
        srctree = None
        srctreeparent = get_default_srctree(config)
        bb.utils.mkdirhier(srctreeparent)
        tmpsrcdir = tempfile.mkdtemp(prefix='devtoolsrc', dir=srctreeparent)

    if srctree and os.path.exists(srctree):
        if args.fetchuri:
            if not os.path.isdir(srctree):
                raise DevtoolError("Cannot fetch into source tree path %s as "
                                   "it exists and is not a directory" %
                                   srctree)
            elif os.listdir(srctree):
                raise DevtoolError("Cannot fetch into source tree path %s as "
                                   "it already exists and is non-empty" %
                                   srctree)
    elif not args.fetchuri:
        if args.srctree:
            raise DevtoolError("Specified source tree %s could not be found" %
                               args.srctree)
        elif srctree:
            raise DevtoolError("No source tree exists at default path %s - "
                               "either create and populate this directory, "
                               "or specify a path to a source tree, or a "
                               "URI to fetch source from" % srctree)
        else:
            raise DevtoolError("You must either specify a source tree "
                               "or a URI to fetch source from")

    if args.version:
        if '_' in args.version or ' ' in args.version:
            raise DevtoolError('Invalid version string "%s"' % args.version)

    if args.color == 'auto' and sys.stdout.isatty():
        color = 'always'
    else:
        color = args.color
    extracmdopts = ''
    if args.fetchuri:
        source = args.fetchuri
        if srctree:
            extracmdopts += ' -x %s' % srctree
        else:
            extracmdopts += ' -x %s' % tmpsrcdir
    else:
        source = srctree
    if args.recipename:
        extracmdopts += ' -N %s' % args.recipename
    if args.version:
        extracmdopts += ' -V %s' % args.version
    if args.binary:
        extracmdopts += ' -b'
    if args.also_native:
        extracmdopts += ' --also-native'
    if args.src_subdir:
        extracmdopts += ' --src-subdir "%s"' % args.src_subdir

    tempdir = tempfile.mkdtemp(prefix='devtool')
    try:
        try:
            stdout, _ = exec_build_env_command(config.init_path, basepath, 'recipetool --color=%s create -o %s "%s" %s' % (color, tempdir, source, extracmdopts))
        except bb.process.ExecutionError as e:
            if e.exitcode == 15:
                raise DevtoolError('Unable to auto-determine name from source tree, please specify it with -N/--name')
            else:
                raise DevtoolError('Command \'%s\' failed:\n%s' % (e.command, e.stdout))

        recipes = glob.glob(os.path.join(tempdir, '*.bb'))
        if recipes:
            recipename = os.path.splitext(os.path.basename(recipes[0]))[0].split('_')[0]
            if recipename in workspace:
                raise DevtoolError('A recipe with the same name as the one being created (%s) already exists in your workspace' % recipename)
            recipedir = os.path.join(config.workspace_path, 'recipes', recipename)
            bb.utils.mkdirhier(recipedir)
            recipefile = os.path.join(recipedir, os.path.basename(recipes[0]))
            appendfile = recipe_to_append(recipefile, config)
            if os.path.exists(appendfile):
                # This shouldn't be possible, but just in case
                raise DevtoolError('A recipe with the same name as the one being created already exists in your workspace')
            if os.path.exists(recipefile):
                raise DevtoolError('A recipe file %s already exists in your workspace; this shouldn\'t be there - please delete it before continuing' % recipefile)
            if tmpsrcdir:
                srctree = os.path.join(srctreeparent, recipename)
                if os.path.exists(tmpsrcdir):
                    if os.path.exists(srctree):
                        if os.path.isdir(srctree):
                            try:
                                os.rmdir(srctree)
                            except OSError as e:
                                if e.errno == errno.ENOTEMPTY:
                                    raise DevtoolError('Source tree path %s already exists and is not empty' % srctree)
                                else:
                                    raise
                        else:
                            raise DevtoolError('Source tree path %s already exists and is not a directory' % srctree)
                    logger.info('Using default source tree path %s' % srctree)
                    shutil.move(tmpsrcdir, srctree)
                else:
                    raise DevtoolError('Couldn\'t find source tree created by recipetool')
            bb.utils.mkdirhier(recipedir)
            shutil.move(recipes[0], recipefile)
        else:
            raise DevtoolError('Command \'%s\' did not create any recipe file:\n%s' % (e.command, e.stdout))
    finally:
        if tmpsrcdir and os.path.exists(tmpsrcdir):
            shutil.rmtree(tmpsrcdir)
        shutil.rmtree(tempdir)

    _add_md5(config, recipename, recipefile)

    if args.fetch and not args.no_git:
        setup_git_repo(srctree, args.version, 'devtool')

    initial_rev = None
    if os.path.exists(os.path.join(srctree, '.git')):
        (stdout, _) = bb.process.run('git rev-parse HEAD', cwd=srctree)
        initial_rev = stdout.rstrip()

    tinfoil = setup_tinfoil(config_only=True, basepath=basepath)
    rd = oe.recipeutils.parse_recipe(recipefile, None, tinfoil.config_data)
    if not rd:
        return 1

    if args.src_subdir:
        srctree = os.path.join(srctree, args.src_subdir)

    bb.utils.mkdirhier(os.path.dirname(appendfile))
    with open(appendfile, 'w') as f:
        f.write('inherit externalsrc\n')
        f.write('EXTERNALSRC = "%s"\n' % srctree)

        b_is_s = use_external_build(args.same_dir, args.no_same_dir, rd)
        if b_is_s:
            f.write('EXTERNALSRC_BUILD = "%s"\n' % srctree)
        if initial_rev:
            f.write('\n# initial_rev: %s\n' % initial_rev)

        if args.binary:
            f.write('do_install_append() {\n')
            f.write('    rm -rf ${D}/.git\n')
            f.write('    rm -f ${D}/singletask.lock\n')
            f.write('}\n')

    _add_md5(config, recipename, appendfile)

    logger.info('Recipe %s has been automatically created; further editing may be required to make it fully functional' % recipefile)

    tinfoil.shutdown()

    return 0


def _check_compatible_recipe(pn, d):
    """Check if the recipe is supported by devtool"""
    if pn == 'perf':
        raise DevtoolError("The perf recipe does not actually check out "
                           "source and thus cannot be supported by this tool")

    if pn in ['kernel-devsrc', 'package-index'] or pn.startswith('gcc-source'):
        raise DevtoolError("The %s recipe is not supported by this tool" % pn)

    if bb.data.inherits_class('image', d):
        raise DevtoolError("The %s recipe is an image, and therefore is not "
                           "supported by this tool" % pn)

    if bb.data.inherits_class('populate_sdk', d):
        raise DevtoolError("The %s recipe is an SDK, and therefore is not "
                           "supported by this tool" % pn)

    if bb.data.inherits_class('packagegroup', d):
        raise DevtoolError("The %s recipe is a packagegroup, and therefore is "
                           "not supported by this tool" % pn)

    if bb.data.inherits_class('meta', d):
        raise DevtoolError("The %s recipe is a meta-recipe, and therefore is "
                           "not supported by this tool" % pn)

    if bb.data.inherits_class('externalsrc', d) and d.getVar('EXTERNALSRC', True):
        raise DevtoolError("externalsrc is currently enabled for the %s "
                           "recipe. This prevents the normal do_patch task "
                           "from working. You will need to disable this "
                           "first." % pn)

def _move_file(src, dst):
    """Move a file. Creates all the directory components of destination path."""
    dst_d = os.path.dirname(dst)
    if dst_d:
        bb.utils.mkdirhier(dst_d)
    shutil.move(src, dst)

def _git_ls_tree(repodir, treeish='HEAD', recursive=False):
    """List contents of a git treeish"""
    import bb
    cmd = ['git', 'ls-tree', '-z', treeish]
    if recursive:
        cmd.append('-r')
    out, _ = bb.process.run(cmd, cwd=repodir)
    ret = {}
    for line in out.split('\0'):
        if line:
            split = line.split(None, 4)
            ret[split[3]] = split[0:3]
    return ret

def _git_exclude_path(srctree, path):
    """Return pathspec (list of paths) that excludes certain path"""
    # NOTE: "Filtering out" files/paths in this way is not entirely reliable -
    # we don't catch files that are deleted, for example. A more reliable way
    # to implement this would be to use "negative pathspecs" which were
    # introduced in Git v1.9.0. Revisit this when/if the required Git version
    # becomes greater than that.
    path = os.path.normpath(path)
    recurse = True if len(path.split(os.path.sep)) > 1 else False
    git_files = _git_ls_tree(srctree, 'HEAD', recurse).keys()
    if path in git_files:
        git_files.remove(path)
        return git_files
    else:
        return ['.']

def _ls_tree(directory):
    """Recursive listing of files in a directory"""
    ret = []
    for root, dirs, files in os.walk(directory):
        ret.extend([os.path.relpath(os.path.join(root, fname), directory) for
                    fname in files])
    return ret


def extract(args, config, basepath, workspace):
    """Entry point for the devtool 'extract' subcommand"""
    import bb

    tinfoil = _prep_extract_operation(config, basepath, args.recipename)
    if not tinfoil:
        # Error already shown
        return 1

    rd = parse_recipe(config, tinfoil, args.recipename, True)
    if not rd:
        return 1

    srctree = os.path.abspath(args.srctree)
    initial_rev = _extract_source(srctree, args.keep_temp, args.branch, False, rd)
    logger.info('Source tree extracted to %s' % srctree)

    if initial_rev:
        return 0
    else:
        return 1

def sync(args, config, basepath, workspace):
    """Entry point for the devtool 'sync' subcommand"""
    import bb

    tinfoil = _prep_extract_operation(config, basepath, args.recipename)
    if not tinfoil:
        # Error already shown
        return 1

    rd = parse_recipe(config, tinfoil, args.recipename, True)
    if not rd:
        return 1

    srctree = os.path.abspath(args.srctree)
    initial_rev = _extract_source(srctree, args.keep_temp, args.branch, True, rd)
    logger.info('Source tree %s synchronized' % srctree)

    if initial_rev:
        return 0
    else:
        return 1

class BbTaskExecutor(object):
    """Class for executing bitbake tasks for a recipe

    FIXME: This is very awkward. Unfortunately it's not currently easy to
    properly execute tasks outside of bitbake itself, until then this has to
    suffice if we are to handle e.g. linux-yocto's extra tasks
    """

    def __init__(self, rdata):
        self.rdata = rdata
        self.executed = []

    def exec_func(self, func, report):
        """Run bitbake task function"""
        if not func in self.executed:
            deps = self.rdata.getVarFlag(func, 'deps')
            if deps:
                for taskdepfunc in deps:
                    self.exec_func(taskdepfunc, True)
            if report:
                logger.info('Executing %s...' % func)
            fn = self.rdata.getVar('FILE', True)
            localdata = bb.build._task_data(fn, func, self.rdata)
            bb.build.exec_func(func, localdata)
            self.executed.append(func)


def _prep_extract_operation(config, basepath, recipename):
    """HACK: Ugly workaround for making sure that requirements are met when
       trying to extract a package. Returns the tinfoil instance to be used."""
    tinfoil = setup_tinfoil(basepath=basepath)
    rd = parse_recipe(config, tinfoil, recipename, True)
    if not rd:
        return None

    if bb.data.inherits_class('kernel-yocto', rd):
        tinfoil.shutdown()
        try:
            stdout, _ = exec_build_env_command(config.init_path, basepath,
                                               'bitbake kern-tools-native')
            tinfoil = setup_tinfoil(basepath=basepath)
        except bb.process.ExecutionError as err:
            raise DevtoolError("Failed to build kern-tools-native:\n%s" %
                               err.stdout)
    return tinfoil


def _extract_source(srctree, keep_temp, devbranch, sync, d):
    """Extract sources of a recipe"""
    import bb.event
    import oe.recipeutils

    def eventfilter(name, handler, event, d):
        """Bitbake event filter for devtool extract operation"""
        if name == 'base_eventhandler':
            return True
        else:
            return False

    if hasattr(bb.event, 'set_eventfilter'):
        bb.event.set_eventfilter(eventfilter)

    pn = d.getVar('PN', True)

    _check_compatible_recipe(pn, d)

    if sync:
        if not os.path.exists(srctree):
                raise DevtoolError("output path %s does not exist" % srctree)
    else:
        if os.path.exists(srctree):
            if not os.path.isdir(srctree):
                raise DevtoolError("output path %s exists and is not a directory" %
                                   srctree)
            elif os.listdir(srctree):
                raise DevtoolError("output path %s already exists and is "
                                   "non-empty" % srctree)

        if 'noexec' in (d.getVarFlags('do_unpack', False) or []):
            raise DevtoolError("The %s recipe has do_unpack disabled, unable to "
                               "extract source" % pn)

    if not sync:
        # Prepare for shutil.move later on
        bb.utils.mkdirhier(srctree)
        os.rmdir(srctree)

    # We don't want notes to be printed, they are too verbose
    origlevel = bb.logger.getEffectiveLevel()
    if logger.getEffectiveLevel() > logging.DEBUG:
        bb.logger.setLevel(logging.WARNING)

    initial_rev = None
    tempdir = tempfile.mkdtemp(prefix='devtool')
    try:
        crd = d.createCopy()
        # Make a subdir so we guard against WORKDIR==S
        workdir = os.path.join(tempdir, 'workdir')
        crd.setVar('WORKDIR', workdir)
        crd.setVar('T', os.path.join(tempdir, 'temp'))
        if not crd.getVar('S', True).startswith(workdir):
            # Usually a shared workdir recipe (kernel, gcc)
            # Try to set a reasonable default
            if bb.data.inherits_class('kernel', d):
                crd.setVar('S', '${WORKDIR}/source')
            else:
                crd.setVar('S', '${WORKDIR}/%s' % os.path.basename(d.getVar('S', True)))
        if bb.data.inherits_class('kernel', d):
            # We don't want to move the source to STAGING_KERNEL_DIR here
            crd.setVar('STAGING_KERNEL_DIR', '${S}')

        task_executor = BbTaskExecutor(crd)

        crd.setVar('EXTERNALSRC_forcevariable', '')

        logger.info('Fetching %s...' % pn)
        task_executor.exec_func('do_fetch', False)
        logger.info('Unpacking...')
        task_executor.exec_func('do_unpack', False)
        if bb.data.inherits_class('kernel-yocto', d):
            # Extra step for kernel to populate the source directory
            logger.info('Doing kernel checkout...')
            task_executor.exec_func('do_kernel_checkout', False)
        srcsubdir = crd.getVar('S', True)

        # Move local source files into separate subdir
        recipe_patches = [os.path.basename(patch) for patch in
                          oe.recipeutils.get_recipe_patches(crd)]
        local_files = oe.recipeutils.get_recipe_local_files(crd)
        local_files = [fname for fname in local_files if
                       os.path.exists(os.path.join(workdir, fname))]
        if local_files:
            for fname in local_files:
                _move_file(os.path.join(workdir, fname),
                           os.path.join(tempdir, 'oe-local-files', fname))
            with open(os.path.join(tempdir, 'oe-local-files', '.gitignore'),
                      'w') as f:
                f.write('# Ignore local files, by default. Remove this file '
                        'if you want to commit the directory to Git\n*\n')

        if srcsubdir == workdir:
            # Find non-patch non-local sources that were "unpacked" to srctree
            # directory
            src_files = [fname for fname in _ls_tree(workdir) if
                         os.path.basename(fname) not in recipe_patches]
            # Force separate S so that patch files can be left out from srctree
            srcsubdir = tempfile.mkdtemp(dir=workdir)
            crd.setVar('S', srcsubdir)
            # Move source files to S
            for path in src_files:
                _move_file(os.path.join(workdir, path),
                           os.path.join(srcsubdir, path))
        elif os.path.dirname(srcsubdir) != workdir:
            # Handle if S is set to a subdirectory of the source
            srcsubdir = os.path.join(workdir, os.path.relpath(srcsubdir, workdir).split(os.sep)[0])

        scriptutils.git_convert_standalone_clone(srcsubdir)

        patchdir = os.path.join(srcsubdir, 'patches')
        haspatches = False
        if os.path.exists(patchdir):
            if os.listdir(patchdir):
                haspatches = True
            else:
                os.rmdir(patchdir)
        # Make sure that srcsubdir exists
        bb.utils.mkdirhier(srcsubdir)
        if not os.path.exists(srcsubdir) or not os.listdir(srcsubdir):
            logger.warning("no source unpacked to S, either the %s recipe "
                           "doesn't use any source or the correct source "
                           "directory could not be determined" % pn)

        setup_git_repo(srcsubdir, crd.getVar('PV', True), devbranch)

        (stdout, _) = bb.process.run('git rev-parse HEAD', cwd=srcsubdir)
        initial_rev = stdout.rstrip()

        crd.setVar('PATCHTOOL', 'git')

        logger.info('Patching...')
        task_executor.exec_func('do_patch', False)

        bb.process.run('git tag -f devtool-patched', cwd=srcsubdir)

        if os.path.exists(patchdir):
            shutil.rmtree(patchdir)
            if haspatches:
                bb.process.run('git checkout patches', cwd=srcsubdir)

        if bb.data.inherits_class('kernel-yocto', d):
            # Store generate and store kernel config
            logger.info('Generating kernel config')
            task_executor.exec_func('do_configure', False)
            kconfig = os.path.join(d.getVar('B', True), '.config')
            shutil.copy2(kconfig, srcsubdir)


        tempdir_localdir = os.path.join(tempdir, 'oe-local-files')
        srctree_localdir = os.path.join(srctree, 'oe-local-files')

        if sync:
            bb.process.run('git fetch file://' + srcsubdir + ' ' + devbranch + ':' + devbranch, cwd=srctree)

            # Move oe-local-files directory to srctree
            # As the oe-local-files is not part of the constructed git tree,
            # remove them directly during the synchrounizating might surprise
            # the users.  Instead, we move it to oe-local-files.bak and remind
            # user in the log message.
            if os.path.exists(srctree_localdir + '.bak'):
                shutil.rmtree(srctree_localdir, srctree_localdir + '.bak')

            if os.path.exists(srctree_localdir):
                logger.info('Backing up current local file directory %s' % srctree_localdir)
                shutil.move(srctree_localdir, srctree_localdir + '.bak')

            if os.path.exists(tempdir_localdir):
                logger.info('Syncing local source files to srctree...')
                shutil.copytree(tempdir_localdir, srctree_localdir)
        else:
            # Move oe-local-files directory to srctree
            if os.path.exists(tempdir_localdir):
                logger.info('Adding local source files to srctree...')
                shutil.move(tempdir_localdir, srcsubdir)

            shutil.move(srcsubdir, srctree)

    finally:
        bb.logger.setLevel(origlevel)

        if keep_temp:
            logger.info('Preserving temporary directory %s' % tempdir)
        else:
            shutil.rmtree(tempdir)
    return initial_rev

def _add_md5(config, recipename, filename):
    """Record checksum of a file (or recursively for a directory) to the md5-file of the workspace"""
    import bb.utils

    def addfile(fn):
        md5 = bb.utils.md5_file(fn)
        with open(os.path.join(config.workspace_path, '.devtool_md5'), 'a') as f:
            f.write('%s|%s|%s\n' % (recipename, os.path.relpath(fn, config.workspace_path), md5))

    if os.path.isdir(filename):
        for root, _, files in os.walk(filename):
            for f in files:
                addfile(os.path.join(root, f))
    else:
        addfile(filename)

def _check_preserve(config, recipename):
    """Check if a file was manually changed and needs to be saved in 'attic'
       directory"""
    import bb.utils
    origfile = os.path.join(config.workspace_path, '.devtool_md5')
    newfile = os.path.join(config.workspace_path, '.devtool_md5_new')
    preservepath = os.path.join(config.workspace_path, 'attic')
    with open(origfile, 'r') as f:
        with open(newfile, 'w') as tf:
            for line in f.readlines():
                splitline = line.rstrip().split('|')
                if splitline[0] == recipename:
                    removefile = os.path.join(config.workspace_path, splitline[1])
                    try:
                        md5 = bb.utils.md5_file(removefile)
                    except IOError as err:
                        if err.errno == 2:
                            # File no longer exists, skip it
                            continue
                        else:
                            raise
                    if splitline[2] != md5:
                        bb.utils.mkdirhier(preservepath)
                        preservefile = os.path.basename(removefile)
                        logger.warn('File %s modified since it was written, preserving in %s' % (preservefile, preservepath))
                        shutil.move(removefile, os.path.join(preservepath, preservefile))
                    else:
                        os.remove(removefile)
                else:
                    tf.write(line)
    os.rename(newfile, origfile)

def modify(args, config, basepath, workspace):
    """Entry point for the devtool 'modify' subcommand"""
    import bb
    import oe.recipeutils

    if args.recipename in workspace:
        raise DevtoolError("recipe %s is already in your workspace" %
                           args.recipename)

    if args.srctree:
        srctree = os.path.abspath(args.srctree)
    else:
        srctree = get_default_srctree(config, args.recipename)

    if not args.extract and not os.path.isdir(srctree):
        raise DevtoolError("directory %s does not exist or not a directory "
                           "(specify -x to extract source from recipe)" %
                           srctree)
    if args.extract:
        tinfoil = _prep_extract_operation(config, basepath, args.recipename)
        if not tinfoil:
            # Error already shown
            return 1
    else:
        tinfoil = setup_tinfoil(basepath=basepath)

    rd = parse_recipe(config, tinfoil, args.recipename, True)
    if not rd:
        return 1

    pn = rd.getVar('PN', True)
    if pn != args.recipename:
        logger.info('Mapping %s to %s' % (args.recipename, pn))
    if pn in workspace:
        raise DevtoolError("recipe %s is already in your workspace" %
                           pn)

    recipefile = rd.getVar('FILE', True)
    appendfile = recipe_to_append(recipefile, config, args.wildcard)
    if os.path.exists(appendfile):
        raise DevtoolError("Another variant of recipe %s is already in your "
                           "workspace (only one variant of a recipe can "
                           "currently be worked on at once)"
                           % pn)

    _check_compatible_recipe(pn, rd)

    initial_rev = None
    commits = []
    if args.extract:
        initial_rev = _extract_source(srctree, False, args.branch, False, rd)
        if not initial_rev:
            return 1
        logger.info('Source tree extracted to %s' % srctree)
        # Get list of commits since this revision
        (stdout, _) = bb.process.run('git rev-list --reverse %s..HEAD' % initial_rev, cwd=srctree)
        commits = stdout.split()
    else:
        if os.path.exists(os.path.join(srctree, '.git')):
            # Check if it's a tree previously extracted by us
            try:
                (stdout, _) = bb.process.run('git branch --contains devtool-base', cwd=srctree)
            except bb.process.ExecutionError:
                stdout = ''
            for line in stdout.splitlines():
                if line.startswith('*'):
                    (stdout, _) = bb.process.run('git rev-parse devtool-base', cwd=srctree)
                    initial_rev = stdout.rstrip()
            if not initial_rev:
                # Otherwise, just grab the head revision
                (stdout, _) = bb.process.run('git rev-parse HEAD', cwd=srctree)
                initial_rev = stdout.rstrip()

    # Check that recipe isn't using a shared workdir
    s = os.path.abspath(rd.getVar('S', True))
    workdir = os.path.abspath(rd.getVar('WORKDIR', True))
    if s.startswith(workdir) and s != workdir and os.path.dirname(s) != workdir:
        # Handle if S is set to a subdirectory of the source
        srcsubdir = os.path.relpath(s, workdir).split(os.sep, 1)[1]
        srctree = os.path.join(srctree, srcsubdir)

    bb.utils.mkdirhier(os.path.dirname(appendfile))
    with open(appendfile, 'w') as f:
        f.write('FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"\n')
        # Local files can be modified/tracked in separate subdir under srctree
        # Mostly useful for packages with S != WORKDIR
        f.write('FILESPATH_prepend := "%s:"\n' %
                os.path.join(srctree, 'oe-local-files'))

        f.write('\ninherit externalsrc\n')
        f.write('# NOTE: We use pn- overrides here to avoid affecting multiple variants in the case where the recipe uses BBCLASSEXTEND\n')
        f.write('EXTERNALSRC_pn-%s = "%s"\n' % (pn, srctree))

        b_is_s = use_external_build(args.same_dir, args.no_same_dir, rd)
        if b_is_s:
            f.write('EXTERNALSRC_BUILD_pn-%s = "%s"\n' % (pn, srctree))

        if bb.data.inherits_class('kernel', rd):
            f.write('SRCTREECOVEREDTASKS = "do_validate_branches do_kernel_checkout '
                    'do_fetch do_unpack do_patch do_kernel_configme do_kernel_configcheck"\n')
        if initial_rev:
            f.write('\n# initial_rev: %s\n' % initial_rev)
            for commit in commits:
                f.write('# commit: %s\n' % commit)

    _add_md5(config, pn, appendfile)

    logger.info('Recipe %s now set up to build from %s' % (pn, srctree))

    return 0

def _get_patchset_revs(args, srctree, recipe_path):
    """Get initial and update rev of a recipe. These are the start point of the
    whole patchset and start point for the patches to be re-generated/updated.
    """
    import bb

    if args.initial_rev:
        return args.initial_rev, args.initial_rev

    # Parse initial rev from recipe
    commits = []
    initial_rev = None
    with open(recipe_path, 'r') as f:
        for line in f:
            if line.startswith('# initial_rev:'):
                initial_rev = line.split(':')[-1].strip()
            elif line.startswith('# commit:'):
                commits.append(line.split(':')[-1].strip())

    update_rev = initial_rev
    changed_revs = None
    if initial_rev:
        # Find first actually changed revision
        stdout, _ = bb.process.run('git rev-list --reverse %s..HEAD' %
                                   initial_rev, cwd=srctree)
        newcommits = stdout.split()
        for i in xrange(min(len(commits), len(newcommits))):
            if newcommits[i] == commits[i]:
                update_rev = commits[i]

        try:
            stdout, _ = bb.process.run('git cherry devtool-patched',
                                        cwd=srctree)
        except bb.process.ExecutionError as err:
            stdout = None

        if stdout is not None:
            changed_revs = []
            for line in stdout.splitlines():
                if line.startswith('+ '):
                    rev = line.split()[1]
                    if rev in newcommits:
                        changed_revs.append(rev)

    return initial_rev, update_rev, changed_revs

def _remove_file_entries(srcuri, filelist):
    """Remove file:// entries from SRC_URI"""
    remaining = filelist[:]
    entries = []
    for fname in filelist:
        basename = os.path.basename(fname)
        for i in xrange(len(srcuri)):
            if (srcuri[i].startswith('file://') and
                    os.path.basename(srcuri[i].split(';')[0]) == basename):
                entries.append(srcuri[i])
                remaining.remove(fname)
                srcuri.pop(i)
                break
    return entries, remaining

def _remove_source_files(args, files, destpath):
    """Unlink existing patch files"""
    for path in files:
        if args.append:
            if not destpath:
                raise Exception('destpath should be set here')
            path = os.path.join(destpath, os.path.basename(path))

        if os.path.exists(path):
            logger.info('Removing file %s' % path)
            # FIXME "git rm" here would be nice if the file in question is
            #       tracked
            # FIXME there's a chance that this file is referred to by
            #       another recipe, in which case deleting wouldn't be the
            #       right thing to do
            os.remove(path)
            # Remove directory if empty
            try:
                os.rmdir(os.path.dirname(path))
            except OSError as ose:
                if ose.errno != errno.ENOTEMPTY:
                    raise


def _export_patches(srctree, rd, start_rev, destdir):
    """Export patches from srctree to given location.
       Returns three-tuple of dicts:
         1. updated - patches that already exist in SRCURI
         2. added - new patches that don't exist in SRCURI
         3  removed - patches that exist in SRCURI but not in exported patches
      In each dict the key is the 'basepath' of the URI and value is the
      absolute path to the existing file in recipe space (if any).
    """
    import oe.recipeutils
    from oe.patch import GitApplyTree
    updated = OrderedDict()
    added = OrderedDict()
    seqpatch_re = re.compile('^([0-9]{4}-)?(.+)')

    existing_patches = dict((os.path.basename(path), path) for path in
                            oe.recipeutils.get_recipe_patches(rd))

    # Generate patches from Git, exclude local files directory
    patch_pathspec = _git_exclude_path(srctree, 'oe-local-files')
    GitApplyTree.extractPatches(srctree, start_rev, destdir, patch_pathspec)

    new_patches = sorted(os.listdir(destdir))
    for new_patch in new_patches:
        # Strip numbering from patch names. If it's a git sequence named patch,
        # the numbers might not match up since we are starting from a different
        # revision This does assume that people are using unique shortlog
        # values, but they ought to be anyway...
        new_basename = seqpatch_re.match(new_patch).group(2)
        found = False
        for old_patch in existing_patches:
            old_basename = seqpatch_re.match(old_patch).group(2)
            if new_basename == old_basename:
                updated[new_patch] = existing_patches.pop(old_patch)
                found = True
                # Rename patch files
                if new_patch != old_patch:
                    os.rename(os.path.join(destdir, new_patch),
                              os.path.join(destdir, old_patch))
                break
        if not found:
            added[new_patch] = None
    return (updated, added, existing_patches)


def _export_local_files(srctree, rd, destdir):
    """Copy local files from srctree to given location.
       Returns three-tuple of dicts:
         1. updated - files that already exist in SRCURI
         2. added - new files files that don't exist in SRCURI
         3  removed - files that exist in SRCURI but not in exported files
      In each dict the key is the 'basepath' of the URI and value is the
      absolute path to the existing file in recipe space (if any).
    """
    import oe.recipeutils

    # Find out local files (SRC_URI files that exist in the "recipe space").
    # Local files that reside in srctree are not included in patch generation.
    # Instead they are directly copied over the original source files (in
    # recipe space).
    existing_files = oe.recipeutils.get_recipe_local_files(rd)
    new_set = None
    updated = OrderedDict()
    added = OrderedDict()
    removed = OrderedDict()
    git_files = _git_ls_tree(srctree)
    if 'oe-local-files' in git_files:
        # If tracked by Git, take the files from srctree HEAD. First get
        # the tree object of the directory
        tmp_index = os.path.join(srctree, '.git', 'index.tmp.devtool')
        tree = git_files['oe-local-files'][2]
        bb.process.run(['git', 'checkout', tree, '--', '.'], cwd=srctree,
                        env=dict(os.environ, GIT_WORK_TREE=destdir,
                                 GIT_INDEX_FILE=tmp_index))
        new_set = _git_ls_tree(srctree, tree, True).keys()
    elif os.path.isdir(os.path.join(srctree, 'oe-local-files')):
        # If not tracked by Git, just copy from working copy
        new_set = _ls_tree(os.path.join(srctree, 'oe-local-files'))
        bb.process.run(['cp', '-ax',
                        os.path.join(srctree, 'oe-local-files', '.'), destdir])
    if new_set is not None:
        for fname in new_set:
            if fname in existing_files:
                updated[fname] = existing_files.pop(fname)
            elif fname != '.gitignore':
                added[fname] = None

        removed = existing_files
    return (updated, added, removed)


def _update_recipe_srcrev(args, srctree, rd, config_data):
    """Implement the 'srcrev' mode of update-recipe"""
    import bb
    import oe.recipeutils

    recipefile = rd.getVar('FILE', True)
    logger.info('Updating SRCREV in recipe %s' % os.path.basename(recipefile))

    # Get HEAD revision
    try:
        stdout, _ = bb.process.run('git rev-parse HEAD', cwd=srctree)
    except bb.process.ExecutionError as err:
        raise DevtoolError('Failed to get HEAD revision in %s: %s' %
                           (srctree, err))
    srcrev = stdout.strip()
    if len(srcrev) != 40:
        raise DevtoolError('Invalid hash returned by git: %s' % stdout)

    destpath = None
    remove_files = []
    patchfields = {}
    patchfields['SRCREV'] = srcrev
    orig_src_uri = rd.getVar('SRC_URI', False) or ''
    srcuri = orig_src_uri.split()
    tempdir = tempfile.mkdtemp(prefix='devtool')
    update_srcuri = False
    try:
        local_files_dir = tempfile.mkdtemp(dir=tempdir)
        upd_f, new_f, del_f = _export_local_files(srctree, rd, local_files_dir)
        if not args.no_remove:
            # Find list of existing patches in recipe file
            patches_dir = tempfile.mkdtemp(dir=tempdir)
            old_srcrev = (rd.getVar('SRCREV', False) or '')
            upd_p, new_p, del_p = _export_patches(srctree, rd, old_srcrev,
                                                  patches_dir)

            # Remove deleted local files and "overlapping" patches
            remove_files = del_f.values() + upd_p.values()
            if remove_files:
                removedentries = _remove_file_entries(srcuri, remove_files)[0]
                update_srcuri = True

        if args.append:
            files = dict((os.path.join(local_files_dir, key), val) for
                          key, val in upd_f.items() + new_f.items())
            removevalues = {}
            if update_srcuri:
                removevalues  = {'SRC_URI': removedentries}
                patchfields['SRC_URI'] = '\\\n    '.join(srcuri)
            _, destpath = oe.recipeutils.bbappend_recipe(
                    rd, args.append, files, wildcardver=args.wildcard_version,
                    extralines=patchfields, removevalues=removevalues)
        else:
            files_dir = os.path.join(os.path.dirname(recipefile),
                                     rd.getVar('BPN', True))
            for basepath, path in upd_f.iteritems():
                logger.info('Updating file %s' % basepath)
                _move_file(os.path.join(local_files_dir, basepath), path)
                update_srcuri= True
            for basepath, path in new_f.iteritems():
                logger.info('Adding new file %s' % basepath)
                _move_file(os.path.join(local_files_dir, basepath),
                           os.path.join(files_dir, basepath))
                srcuri.append('file://%s' % basepath)
                update_srcuri = True
            if update_srcuri:
                patchfields['SRC_URI'] = ' '.join(srcuri)
            oe.recipeutils.patch_recipe(rd, recipefile, patchfields)
    finally:
        shutil.rmtree(tempdir)
    if not 'git://' in orig_src_uri:
        logger.info('You will need to update SRC_URI within the recipe to '
                    'point to a git repository where you have pushed your '
                    'changes')

    _remove_source_files(args, remove_files, destpath)

def _update_recipe_patch(args, config, workspace, srctree, rd, config_data):
    """Implement the 'patch' mode of update-recipe"""
    import bb
    import oe.recipeutils

    recipefile = rd.getVar('FILE', True)
    append = workspace[args.recipename]['bbappend']
    if not os.path.exists(append):
        raise DevtoolError('unable to find workspace bbappend for recipe %s' %
                           args.recipename)

    initial_rev, update_rev, changed_revs = _get_patchset_revs(args, srctree, append)
    if not initial_rev:
        raise DevtoolError('Unable to find initial revision - please specify '
                           'it with --initial-rev')

    tempdir = tempfile.mkdtemp(prefix='devtool')
    try:
        local_files_dir = tempfile.mkdtemp(dir=tempdir)
        upd_f, new_f, del_f = _export_local_files(srctree, rd, local_files_dir)

        remove_files = []
        if not args.no_remove:
            # Get all patches from source tree and check if any should be removed
            all_patches_dir = tempfile.mkdtemp(dir=tempdir)
            upd_p, new_p, del_p = _export_patches(srctree, rd, initial_rev,
                                                  all_patches_dir)
            # Remove deleted local files and  patches
            remove_files = del_f.values() + del_p.values()

        # Get updated patches from source tree
        patches_dir = tempfile.mkdtemp(dir=tempdir)
        upd_p, new_p, del_p = _export_patches(srctree, rd, update_rev,
                                              patches_dir)
        updatefiles = False
        updaterecipe = False
        destpath = None
        srcuri = (rd.getVar('SRC_URI', False) or '').split()
        if args.append:
            files = dict((os.path.join(local_files_dir, key), val) for
                         key, val in upd_f.items() + new_f.items())
            files.update(dict((os.path.join(patches_dir, key), val) for
                              key, val in upd_p.items() + new_p.items()))
            if files or remove_files:
                removevalues = None
                if remove_files:
                    removedentries, remaining = _remove_file_entries(
                                                    srcuri, remove_files)
                    if removedentries or remaining:
                        remaining = ['file://' + os.path.basename(item) for
                                     item in remaining]
                        removevalues = {'SRC_URI': removedentries + remaining}
                _, destpath = oe.recipeutils.bbappend_recipe(
                                rd, args.append, files,
                                removevalues=removevalues)
            else:
                logger.info('No patches or local source files needed updating')
        else:
            # Update existing files
            for basepath, path in upd_f.iteritems():
                logger.info('Updating file %s' % basepath)
                _move_file(os.path.join(local_files_dir, basepath), path)
                updatefiles = True
            for basepath, path in upd_p.iteritems():
                patchfn = os.path.join(patches_dir, basepath)
                if changed_revs is not None:
                    # Avoid updating patches that have not actually changed
                    with open(patchfn, 'r') as f:
                        firstlineitems = f.readline().split()
                        if len(firstlineitems) > 1 and len(firstlineitems[1]) == 40:
                            if not firstlineitems[1] in changed_revs:
                                continue
                logger.info('Updating patch %s' % basepath)
                _move_file(patchfn, path)
                updatefiles = True
            # Add any new files
            files_dir = os.path.join(os.path.dirname(recipefile),
                                     rd.getVar('BPN', True))
            for basepath, path in new_f.iteritems():
                logger.info('Adding new file %s' % basepath)
                _move_file(os.path.join(local_files_dir, basepath),
                           os.path.join(files_dir, basepath))
                srcuri.append('file://%s' % basepath)
                updaterecipe = True
            for basepath, path in new_p.iteritems():
                logger.info('Adding new patch %s' % basepath)
                _move_file(os.path.join(patches_dir, basepath),
                           os.path.join(files_dir, basepath))
                srcuri.append('file://%s' % basepath)
                updaterecipe = True
            # Update recipe, if needed
            if _remove_file_entries(srcuri, remove_files)[0]:
                updaterecipe = True
            if updaterecipe:
                logger.info('Updating recipe %s' % os.path.basename(recipefile))
                oe.recipeutils.patch_recipe(rd, recipefile,
                                            {'SRC_URI': ' '.join(srcuri)})
            elif not updatefiles:
                # Neither patches nor recipe were updated
                logger.info('No patches or files need updating')
    finally:
        shutil.rmtree(tempdir)

    _remove_source_files(args, remove_files, destpath)

def _guess_recipe_update_mode(srctree, rdata):
    """Guess the recipe update mode to use"""
    src_uri = (rdata.getVar('SRC_URI', False) or '').split()
    git_uris = [uri for uri in src_uri if uri.startswith('git://')]
    if not git_uris:
        return 'patch'
    # Just use the first URI for now
    uri = git_uris[0]
    # Check remote branch
    params = bb.fetch.decodeurl(uri)[5]
    upstr_branch = params['branch'] if 'branch' in params else 'master'
    # Check if current branch HEAD is found in upstream branch
    stdout, _ = bb.process.run('git rev-parse HEAD', cwd=srctree)
    head_rev = stdout.rstrip()
    stdout, _ = bb.process.run('git branch -r --contains %s' % head_rev,
                               cwd=srctree)
    remote_brs = [branch.strip() for branch in stdout.splitlines()]
    if 'origin/' + upstr_branch in remote_brs:
        return 'srcrev'

    return 'patch'

def update_recipe(args, config, basepath, workspace):
    """Entry point for the devtool 'update-recipe' subcommand"""
    check_workspace_recipe(workspace, args.recipename)

    if args.append:
        if not os.path.exists(args.append):
            raise DevtoolError('bbappend destination layer directory "%s" '
                               'does not exist' % args.append)
        if not os.path.exists(os.path.join(args.append, 'conf', 'layer.conf')):
            raise DevtoolError('conf/layer.conf not found in bbappend '
                               'destination layer "%s"' % args.append)

    tinfoil = setup_tinfoil(basepath=basepath, tracking=True)

    rd = parse_recipe(config, tinfoil, args.recipename, True)
    if not rd:
        return 1

    srctree = workspace[args.recipename]['srctree']
    if args.mode == 'auto':
        mode = _guess_recipe_update_mode(srctree, rd)
    else:
        mode = args.mode

    if mode == 'srcrev':
        _update_recipe_srcrev(args, srctree, rd, tinfoil.config_data)
    elif mode == 'patch':
        _update_recipe_patch(args, config, workspace, srctree, rd, tinfoil.config_data)
    else:
        raise DevtoolError('update_recipe: invalid mode %s' % mode)

    rf = rd.getVar('FILE', True)
    if rf.startswith(config.workspace_path):
        logger.warn('Recipe file %s has been updated but is inside the workspace - you will need to move it (and any associated files next to it) out to the desired layer before using "devtool reset" in order to keep any changes' % rf)

    return 0


def status(args, config, basepath, workspace):
    """Entry point for the devtool 'status' subcommand"""
    if workspace:
        for recipe, value in workspace.iteritems():
            recipefile = value['recipefile']
            if recipefile:
                recipestr = ' (%s)' % recipefile
            else:
                recipestr = ''
            print("%s: %s%s" % (recipe, value['srctree'], recipestr))
    else:
        logger.info('No recipes currently in your workspace - you can use "devtool modify" to work on an existing recipe or "devtool add" to add a new one')
    return 0


def reset(args, config, basepath, workspace):
    """Entry point for the devtool 'reset' subcommand"""
    import bb
    if args.recipename:
        if args.all:
            raise DevtoolError("Recipe cannot be specified if -a/--all is used")
        else:
            check_workspace_recipe(workspace, args.recipename, checksrc=False)
    elif not args.all:
        raise DevtoolError("Recipe must be specified, or specify -a/--all to "
                           "reset all recipes")
    if args.all:
        recipes = workspace.keys()
    else:
        recipes = [args.recipename]

    if recipes and not args.no_clean:
        if len(recipes) == 1:
            logger.info('Cleaning sysroot for recipe %s...' % recipes[0])
        else:
            logger.info('Cleaning sysroot for recipes %s...' % ', '.join(recipes))
        # If the recipe file itself was created in the workspace, and
        # it uses BBCLASSEXTEND, then we need to also clean the other
        # variants
        targets = []
        for recipe in recipes:
            targets.append(recipe)
            recipefile = workspace[recipe]['recipefile']
            if recipefile:
                targets.extend(get_bbclassextend_targets(recipefile, recipe))
        try:
            exec_build_env_command(config.init_path, basepath, 'bitbake -c clean %s' % ' '.join(targets))
        except bb.process.ExecutionError as e:
            raise DevtoolError('Command \'%s\' failed, output:\n%s\nIf you '
                                'wish, you may specify -n/--no-clean to '
                                'skip running this command when resetting' %
                                (e.command, e.stdout))

    for pn in recipes:
        _check_preserve(config, pn)

        preservepath = os.path.join(config.workspace_path, 'attic', pn)
        def preservedir(origdir):
            if os.path.exists(origdir):
                for root, dirs, files in os.walk(origdir):
                    for fn in files:
                        logger.warn('Preserving %s in %s' % (fn, preservepath))
                        _move_file(os.path.join(origdir, fn),
                                   os.path.join(preservepath, fn))
                    for dn in dirs:
                        os.rmdir(os.path.join(root, dn))
                os.rmdir(origdir)

        preservedir(os.path.join(config.workspace_path, 'recipes', pn))
        # We don't automatically create this dir next to appends, but the user can
        preservedir(os.path.join(config.workspace_path, 'appends', pn))

        srctree = workspace[pn]['srctree']
        if os.path.isdir(srctree):
            if os.listdir(srctree):
                # We don't want to risk wiping out any work in progress
                logger.info('Leaving source tree %s as-is; if you no '
                            'longer need it then please delete it manually'
                            % srctree)
            else:
                # This is unlikely, but if it's empty we can just remove it
                os.rmdir(srctree)

    return 0


def edit_recipe(args, config, basepath, workspace):
    """Entry point for the devtool 'edit-recipe' subcommand"""
    if args.any_recipe:
        tinfoil = setup_tinfoil(config_only=False, basepath=basepath)
        try:
            rd = parse_recipe(config, tinfoil, args.recipename, True)
            if not rd:
                return 1
            recipefile = rd.getVar('FILE', True)
        finally:
            tinfoil.shutdown()
    else:
        check_workspace_recipe(workspace, args.recipename)
        recipefile = workspace[args.recipename]['recipefile']
        if not recipefile:
            raise DevtoolError("Recipe file for %s is not under the workspace" %
                               args.recipename)

    editor = os.environ.get('EDITOR', None)
    if not editor:
        raise DevtoolError("EDITOR environment variable not set")

    import subprocess
    try:
        subprocess.check_call('%s "%s"' % (editor, recipefile), shell=True)
    except subprocess.CalledProcessError as e:
        return e.returncode

    return 0

def get_default_srctree(config, recipename=''):
    """Get the default srctree path"""
    srctreeparent = config.get('General', 'default_source_parent_dir', config.workspace_path)
    if recipename:
        return os.path.join(srctreeparent, 'sources', recipename)
    else:
        return os.path.join(srctreeparent, 'sources')

def register_commands(subparsers, context):
    """Register devtool subcommands from this plugin"""

    defsrctree = get_default_srctree(context.config)
    parser_add = subparsers.add_parser('add', help='Add a new recipe',
                                       description='Adds a new recipe to the workspace to build a specified source tree. Can optionally fetch a remote URI and unpack it to create the source tree.')
    parser_add.add_argument('recipename', nargs='?', help='Name for new recipe to add (just name - no version, path or extension). If not specified, will attempt to auto-detect it.')
    parser_add.add_argument('srctree', nargs='?', help='Path to external source tree. If not specified, a subdirectory of %s will be used.' % defsrctree)
    parser_add.add_argument('fetchuri', nargs='?', help='Fetch the specified URI and extract it to create the source tree')
    group = parser_add.add_mutually_exclusive_group()
    group.add_argument('--same-dir', '-s', help='Build in same directory as source', action="store_true")
    group.add_argument('--no-same-dir', help='Force build in a separate build directory', action="store_true")
    parser_add.add_argument('--fetch', '-f', help='Fetch the specified URI and extract it to create the source tree (deprecated - pass as positional argument instead)', metavar='URI')
    parser_add.add_argument('--version', '-V', help='Version to use within recipe (PV)')
    parser_add.add_argument('--no-git', '-g', help='If fetching source, do not set up source tree as a git repository', action="store_true")
    parser_add.add_argument('--binary', '-b', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure). Useful with binary packages e.g. RPMs.', action='store_true')
    parser_add.add_argument('--also-native', help='Also add native variant (i.e. support building recipe for the build host as well as the target machine)', action='store_true')
    parser_add.add_argument('--src-subdir', help='Specify subdirectory within source tree to use', metavar='SUBDIR')
    parser_add.set_defaults(func=add)

    parser_modify = subparsers.add_parser('modify', help='Modify the source for an existing recipe',
                                       description='Enables modifying the source for an existing recipe. You can either provide your own pre-prepared source tree, or specify -x/--extract to extract the source being fetched by the recipe.')
    parser_modify.add_argument('recipename', help='Name of existing recipe to edit (just name - no version, path or extension)')
    parser_modify.add_argument('srctree', nargs='?', help='Path to external source tree. If not specified, a subdirectory of %s will be used.' % defsrctree)
    parser_modify.add_argument('--wildcard', '-w', action="store_true", help='Use wildcard for unversioned bbappend')
    parser_modify.add_argument('--extract', '-x', action="store_true", help='Extract source as well')
    group = parser_modify.add_mutually_exclusive_group()
    group.add_argument('--same-dir', '-s', help='Build in same directory as source', action="store_true")
    group.add_argument('--no-same-dir', help='Force build in a separate build directory', action="store_true")
    parser_modify.add_argument('--branch', '-b', default="devtool", help='Name for development branch to checkout (only when using -x) (default "%(default)s")')
    parser_modify.set_defaults(func=modify)

    parser_extract = subparsers.add_parser('extract', help='Extract the source for an existing recipe',
                                       description='Extracts the source for an existing recipe')
    parser_extract.add_argument('recipename', help='Name of recipe to extract the source for')
    parser_extract.add_argument('srctree', help='Path to where to extract the source tree')
    parser_extract.add_argument('--branch', '-b', default="devtool", help='Name for development branch to checkout (default "%(default)s")')
    parser_extract.add_argument('--keep-temp', action="store_true", help='Keep temporary directory (for debugging)')
    parser_extract.set_defaults(func=extract, no_workspace=True)

    parser_sync = subparsers.add_parser('sync', help='Synchronize the source tree for an existing recipe',
                                       description='Synchronize the previously extracted source tree for an existing recipe',
                                       formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser_sync.add_argument('recipename', help='Name of recipe to sync the source for')
    parser_sync.add_argument('srctree', help='Path to the source tree')
    parser_sync.add_argument('--branch', '-b', default="devtool", help='Name for development branch to checkout')
    parser_sync.add_argument('--keep-temp', action="store_true", help='Keep temporary directory (for debugging)')
    parser_sync.set_defaults(func=sync)

    parser_update_recipe = subparsers.add_parser('update-recipe', help='Apply changes from external source tree to recipe',
                                       description='Applies changes from external source tree to a recipe (updating/adding/removing patches as necessary, or by updating SRCREV). Note that these changes need to have been committed to the git repository in order to be recognised.')
    parser_update_recipe.add_argument('recipename', help='Name of recipe to update')
    parser_update_recipe.add_argument('--mode', '-m', choices=['patch', 'srcrev', 'auto'], default='auto', help='Update mode (where %(metavar)s is %(choices)s; default is %(default)s)', metavar='MODE')
    parser_update_recipe.add_argument('--initial-rev', help='Override starting revision for patches')
    parser_update_recipe.add_argument('--append', '-a', help='Write changes to a bbappend in the specified layer instead of the recipe', metavar='LAYERDIR')
    parser_update_recipe.add_argument('--wildcard-version', '-w', help='In conjunction with -a/--append, use a wildcard to make the bbappend apply to any recipe version', action='store_true')
    parser_update_recipe.add_argument('--no-remove', '-n', action="store_true", help='Don\'t remove patches, only add or update')
    parser_update_recipe.set_defaults(func=update_recipe)

    parser_status = subparsers.add_parser('status', help='Show workspace status',
                                          description='Lists recipes currently in your workspace and the paths to their respective external source trees')
    parser_status.set_defaults(func=status)

    parser_reset = subparsers.add_parser('reset', help='Remove a recipe from your workspace',
                                         description='Removes the specified recipe from your workspace (resetting its state)')
    parser_reset.add_argument('recipename', nargs='?', help='Recipe to reset')
    parser_reset.add_argument('--all', '-a', action="store_true", help='Reset all recipes (clear workspace)')
    parser_reset.add_argument('--no-clean', '-n', action="store_true", help='Don\'t clean the sysroot to remove recipe output')
    parser_reset.set_defaults(func=reset)

    parser_edit_recipe = subparsers.add_parser('edit-recipe', help='Edit a recipe file in your workspace',
                                         description='Runs the default editor (as specified by the EDITOR variable) on the specified recipe. Note that the recipe file itself must be in the workspace (i.e. as a result of "devtool add" or "devtool upgrade"); you can override this with the -a/--any-recipe option.')
    parser_edit_recipe.add_argument('recipename', help='Recipe to edit')
    parser_edit_recipe.add_argument('--any-recipe', '-a', action="store_true", help='Edit any recipe, not just where the recipe file itself is in the workspace')
    parser_edit_recipe.set_defaults(func=edit_recipe)