summaryrefslogtreecommitdiff
path: root/builtin/submodule--helper.c
blob: fd72c90442dca5f1be7bb822ed0579813557c739 (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
#include "builtin.h"
#include "cache.h"
#include "parse-options.h"
#include "quote.h"
#include "pathspec.h"
#include "dir.h"
#include "utf8.h"
#include "submodule.h"
#include "submodule-config.h"
#include "string-list.h"
#include "run-command.h"
#include "remote.h"
#include "refs.h"
#include "connect.h"
 
static char *get_default_remote(void)
{
	char *dest = NULL, *ret;
	unsigned char sha1[20];
	struct strbuf sb = STRBUF_INIT;
	const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
 
	if (!refname)
		die(_("No such ref: %s"), "HEAD");
 
	/* detached HEAD */
	if (!strcmp(refname, "HEAD"))
		return xstrdup("origin");
 
	if (!skip_prefix(refname, "refs/heads/", &refname))
		die(_("Expecting a full ref name, got %s"), refname);
 
	strbuf_addf(&sb, "branch.%s.remote", refname);
	if (git_config_get_string(sb.buf, &dest))
		ret = xstrdup("origin");
	else
		ret = dest;
 
	strbuf_release(&sb);
	return ret;
}
 
static int starts_with_dot_slash(const char *str)
{
	return str[0] == '.' && is_dir_sep(str[1]);
}
 
static int starts_with_dot_dot_slash(const char *str)
{
	return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
}
 
/*
 * Returns 1 if it was the last chop before ':'.
 */
static int chop_last_dir(char **remoteurl, int is_relative)
{
	char *rfind = find_last_dir_sep(*remoteurl);
	if (rfind) {
		*rfind = '\0';
		return 0;
	}
 
	rfind = strrchr(*remoteurl, ':');
	if (rfind) {
		*rfind = '\0';
		return 1;
	}
 
	if (is_relative || !strcmp(".", *remoteurl))
		die(_("cannot strip one component off url '%s'"),
			*remoteurl);
 
	free(*remoteurl);
	*remoteurl = xstrdup(".");
	return 0;
}
 
/*
 * The `url` argument is the URL that navigates to the submodule origin
 * repo. When relative, this URL is relative to the superproject origin
 * URL repo. The `up_path` argument, if specified, is the relative
 * path that navigates from the submodule working tree to the superproject
 * working tree. Returns the origin URL of the submodule.
 *
 * Return either an absolute URL or filesystem path (if the superproject
 * origin URL is an absolute URL or filesystem path, respectively) or a
 * relative file system path (if the superproject origin URL is a relative
 * file system path).
 *
 * When the output is a relative file system path, the path is either
 * relative to the submodule working tree, if up_path is specified, or to
 * the superproject working tree otherwise.
 *
 * NEEDSWORK: This works incorrectly on the domain and protocol part.
 * remote_url      url              outcome          expectation
 * http://a.com/b  ../c             http://a.com/c   as is
 * http://a.com/b  ../../c          http://c         error out
 * http://a.com/b  ../../../c       http:/c          error out
 * http://a.com/b  ../../../../c    http:c           error out
 * http://a.com/b  ../../../../../c    .:c           error out
 * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 * when a local part has a colon in its path component, too.
 */
static char *relative_url(const char *remote_url,
				const char *url,
				const char *up_path)
{
	int is_relative = 0;
	int colonsep = 0;
	char *out;
	char *remoteurl = xstrdup(remote_url);
	struct strbuf sb = STRBUF_INIT;
	size_t len = strlen(remoteurl);
 
	if (is_dir_sep(remoteurl[len]))
		remoteurl[len] = '\0';
 
	if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
		is_relative = 0;
	else {
		is_relative = 1;
		/*
		 * Prepend a './' to ensure all relative
		 * remoteurls start with './' or '../'
		 */
		if (!starts_with_dot_slash(remoteurl) &&
		    !starts_with_dot_dot_slash(remoteurl)) {
			strbuf_reset(&sb);
			strbuf_addf(&sb, "./%s", remoteurl);
			free(remoteurl);
			remoteurl = strbuf_detach(&sb, NULL);
		}
	}
	/*
	 * When the url starts with '../', remove that and the
	 * last directory in remoteurl.
	 */
	while (url) {
		if (starts_with_dot_dot_slash(url)) {
			url += 3;
			colonsep |= chop_last_dir(&remoteurl, is_relative);
		} else if (starts_with_dot_slash(url))
			url += 2;
		else
			break;
	}
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
	free(remoteurl);
 
	if (starts_with_dot_slash(sb.buf))
		out = xstrdup(sb.buf + 2);
	else
		out = xstrdup(sb.buf);
	strbuf_reset(&sb);
 
	if (!up_path || !is_relative)
		return out;
 
	strbuf_addf(&sb, "%s%s", up_path, out);
	free(out);
	return strbuf_detach(&sb, NULL);
}
 
static int resolve_relative_url(int argc, const char **argv, const char *prefix)
{
	char *remoteurl = NULL;
	char *remote = get_default_remote();
	const char *up_path = NULL;
	char *res;
	const char *url;
	struct strbuf sb = STRBUF_INIT;
 
	if (argc != 2 && argc != 3)
		die("resolve-relative-url only accepts one or two arguments");
 
	url = argv[1];
	strbuf_addf(&sb, "remote.%s.url", remote);
	free(remote);
 
	if (git_config_get_string(sb.buf, &remoteurl))
		/* the repository is its own authoritative upstream */
		remoteurl = xgetcwd();
 
	if (argc == 3)
		up_path = argv[2];
 
	res = relative_url(remoteurl, url, up_path);
	puts(res);
	free(res);
	free(remoteurl);
	return 0;
}
 
static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
{
	char *remoteurl, *res;
	const char *up_path, *url;
 
	if (argc != 4)
		die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
 
	up_path = argv[1];
	remoteurl = xstrdup(argv[2]);
	url = argv[3];
 
	if (!strcmp(up_path, "(null)"))
		up_path = NULL;
 
	res = relative_url(remoteurl, url, up_path);
	puts(res);
	free(res);
	free(remoteurl);
	return 0;
}
 
struct module_list {
	const struct cache_entry **entries;
	int alloc, nr;
};
#define MODULE_LIST_INIT { NULL, 0, 0 }
 
static int module_list_compute(int argc, const char **argv,
			       const char *prefix,
			       struct pathspec *pathspec,
			       struct module_list *list)
{
	int i, result = 0;
	char *ps_matched = NULL;
	parse_pathspec(pathspec, 0,
		       PATHSPEC_PREFER_FULL |
		       PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,
		       prefix, argv);
 
	if (pathspec->nr)
		ps_matched = xcalloc(pathspec->nr, 1);
 
	if (read_cache() < 0)
		die(_("index file corrupt"));
 
	for (i = 0; i < active_nr; i++) {
		const struct cache_entry *ce = active_cache[i];
 
		if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
				    0, ps_matched, 1) ||
		    !S_ISGITLINK(ce->ce_mode))
			continue;
 
		ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
		list->entries[list->nr++] = ce;
		while (i + 1 < active_nr &&
		       !strcmp(ce->name, active_cache[i + 1]->name))
			/*
			 * Skip entries with the same name in different stages
			 * to make sure an entry is returned only once.
			 */
			i++;
	}
 
	if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
		result = -1;
 
	free(ps_matched);
 
	return result;
}
 
static int module_list(int argc, const char **argv, const char *prefix)
{
	int i;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
 
	struct option module_list_options[] = {
		OPT_STRING(0, "prefix", &prefix,
			   N_("path"),
			   N_("alternative anchor for relative paths")),
		OPT_END()
	};
 
	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
		NULL
	};
 
	argc = parse_options(argc, argv, prefix, module_list_options,
			     git_submodule_helper_usage, 0);
 
	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;
 
	for (i = 0; i < list.nr; i++) {
		const struct cache_entry *ce = list.entries[i];
 
		if (ce_stage(ce))
			printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
		else
			printf("%06o %s %d\t", ce->ce_mode,
			       oid_to_hex(&ce->oid), ce_stage(ce));
 
		utf8_fprintf(stdout, "%s\n", ce->name);
	}
	return 0;
}
 
static void init_submodule(const char *path, const char *prefix, int quiet)
{
	const struct submodule *sub;
	struct strbuf sb = STRBUF_INIT;
	char *upd = NULL, *url = NULL, *displaypath;
 
	/* Only loads from .gitmodules, no overlay with .git/config */
	gitmodules_config();
 
	if (prefix) {
		strbuf_addf(&sb, "%s%s", prefix, path);
		displaypath = strbuf_detach(&sb, NULL);
	} else
		displaypath = xstrdup(path);
 
	sub = submodule_from_path(null_sha1, path);
 
	if (!sub)
		die(_("No url found for submodule path '%s' in .gitmodules"),
			displaypath);
 
	/*
	 * Copy url setting when it is not set yet.
	 * To look up the url in .git/config, we must not fall back to
	 * .gitmodules, so look it up directly.
	 */
	strbuf_reset(&sb);
	strbuf_addf(&sb, "submodule.%s.url", sub->name);
	if (git_config_get_string(sb.buf, &url)) {
		url = xstrdup(sub->url);
 
		if (!url)
			die(_("No url found for submodule path '%s' in .gitmodules"),
				displaypath);
 
		/* Possibly a url relative to parent */
		if (starts_with_dot_dot_slash(url) ||
		    starts_with_dot_slash(url)) {
			char *remoteurl, *relurl;
			char *remote = get_default_remote();
			struct strbuf remotesb = STRBUF_INIT;
			strbuf_addf(&remotesb, "remote.%s.url", remote);
			free(remote);
 
			if (git_config_get_string(remotesb.buf, &remoteurl))
				/*
				 * The repository is its own
				 * authoritative upstream
				 */
				remoteurl = xgetcwd();
			relurl = relative_url(remoteurl, url, NULL);
			strbuf_release(&remotesb);
			free(remoteurl);
			free(url);
			url = relurl;
		}
 
		if (git_config_set_gently(sb.buf, url))
			die(_("Failed to register url for submodule path '%s'"),
			    displaypath);
		if (!quiet)
			fprintf(stderr,
				_("Submodule '%s' (%s) registered for path '%s'\n"),
				sub->name, url, displaypath);
	}
 
	/* Copy "update" setting when it is not set yet */
	strbuf_reset(&sb);
	strbuf_addf(&sb, "submodule.%s.update", sub->name);
	if (git_config_get_string(sb.buf, &upd) &&
	    sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
		if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
			fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
				sub->name);
			upd = xstrdup("none");
		} else
			upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
 
		if (git_config_set_gently(sb.buf, upd))
			die(_("Failed to register update mode for submodule path '%s'"), displaypath);
	}
	strbuf_release(&sb);
	free(displaypath);
	free(url);
	free(upd);
}
 
static int module_init(int argc, const char **argv, const char *prefix)
{
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
	int quiet = 0;
	int i;
 
	struct option module_init_options[] = {
		OPT_STRING(0, "prefix", &prefix,
			   N_("path"),
			   N_("alternative anchor for relative paths")),
		OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
		OPT_END()
	};
 
	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper init [<path>]"),
		NULL
	};
 
	argc = parse_options(argc, argv, prefix, module_init_options,
			     git_submodule_helper_usage, 0);
 
	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;
 
	for (i = 0; i < list.nr; i++)
		init_submodule(list.entries[i]->name, prefix, quiet);
 
	return 0;
}
 
static int module_name(int argc, const char **argv, const char *prefix)
{
	const struct submodule *sub;
 
	if (argc != 2)
		usage(_("git submodule--helper name <path>"));
 
	gitmodules_config();
	sub = submodule_from_path(null_sha1, argv[1]);
 
	if (!sub)
		die(_("no submodule mapping found in .gitmodules for path '%s'"),
		    argv[1]);
 
	printf("%s\n", sub->name);
 
	return 0;
}
 
static int clone_submodule(const char *path, const char *gitdir, const char *url,
			   const char *depth, struct string_list *reference,
			   int quiet, int progress)
{
	struct child_process cp = CHILD_PROCESS_INIT;
 
	argv_array_push(&cp.args, "clone");
	argv_array_push(&cp.args, "--no-checkout");
	if (quiet)
		argv_array_push(&cp.args, "--quiet");
	if (progress)
		argv_array_push(&cp.args, "--progress");
	if (depth && *depth)
		argv_array_pushl(&cp.args, "--depth", depth, NULL);
	if (reference->nr) {
		struct string_list_item *item;
		for_each_string_list_item(item, reference)
			argv_array_pushl(&cp.args, "--reference",
					 item->string, NULL);
	}
	if (gitdir && *gitdir)
		argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 
	argv_array_push(&cp.args, url);
	argv_array_push(&cp.args, path);
 
	cp.git_cmd = 1;
	prepare_submodule_repo_env(&cp.env_array);
	cp.no_stdin = 1;
 
	return run_command(&cp);
}
 
struct submodule_alternate_setup {
	const char *submodule_name;
	enum SUBMODULE_ALTERNATE_ERROR_MODE {
		SUBMODULE_ALTERNATE_ERROR_DIE,
		SUBMODULE_ALTERNATE_ERROR_INFO,
		SUBMODULE_ALTERNATE_ERROR_IGNORE
	} error_mode;
	struct string_list *reference;
};
#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
	SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 
static int add_possible_reference_from_superproject(
		struct alternate_object_database *alt, void *sas_cb)
{
	struct submodule_alternate_setup *sas = sas_cb;
 
	/*
	 * If the alternate object store is another repository, try the
	 * standard layout with .git/modules/<name>/objects
	 */
	if (ends_with(alt->path, ".git/objects")) {
		char *sm_alternate;
		struct strbuf sb = STRBUF_INIT;
		struct strbuf err = STRBUF_INIT;
		strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
 
		/*
		 * We need to end the new path with '/' to mark it as a dir,
		 * otherwise a submodule name containing '/' will be broken
		 * as the last part of a missing submodule reference would
		 * be taken as a file name.
		 */
		strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
 
		sm_alternate = compute_alternate_path(sb.buf, &err);
		if (sm_alternate) {
			string_list_append(sas->reference, xstrdup(sb.buf));
			free(sm_alternate);
		} else {
			switch (sas->error_mode) {
			case SUBMODULE_ALTERNATE_ERROR_DIE:
				die(_("submodule '%s' cannot add alternate: %s"),
				    sas->submodule_name, err.buf);
			case SUBMODULE_ALTERNATE_ERROR_INFO:
				fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
					sas->submodule_name, err.buf);
			case SUBMODULE_ALTERNATE_ERROR_IGNORE:
				; /* nothing */
			}
		}
		strbuf_release(&sb);
	}
 
	return 0;
}
 
static void prepare_possible_alternates(const char *sm_name,
		struct string_list *reference)
{
	char *sm_alternate = NULL, *error_strategy = NULL;
	struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
 
	git_config_get_string("submodule.alternateLocation", &sm_alternate);
	if (!sm_alternate)
		return;
 
	git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
 
	if (!error_strategy)
		error_strategy = xstrdup("die");
 
	sas.submodule_name = sm_name;
	sas.reference = reference;
	if (!strcmp(error_strategy, "die"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
	else if (!strcmp(error_strategy, "info"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
	else if (!strcmp(error_strategy, "ignore"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
	else
		die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
 
	if (!strcmp(sm_alternate, "superproject"))
		foreach_alt_odb(add_possible_reference_from_superproject, &sas);
	else if (!strcmp(sm_alternate, "no"))
		; /* do nothing */
	else
		die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
 
	free(sm_alternate);
	free(error_strategy);
}
 
static int module_clone(int argc, const char **argv, const char *prefix)
{
	const char *name = NULL, *url = NULL, *depth = NULL;
	int quiet = 0;
	int progress = 0;
	FILE *submodule_dot_git;
	char *p, *path = NULL, *sm_gitdir;
	struct strbuf rel_path = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	struct string_list reference = STRING_LIST_INIT_NODUP;
 
	struct option module_clone_options[] = {
		OPT_STRING(0, "prefix", &prefix,
			   N_("path"),
			   N_("alternative anchor for relative paths")),
		OPT_STRING(0, "path", &path,
			   N_("path"),
			   N_("where the new submodule will be cloned to")),
		OPT_STRING(0, "name", &name,
			   N_("string"),
			   N_("name of the new submodule")),
		OPT_STRING(0, "url", &url,
			   N_("string"),
			   N_("url where to clone the submodule from")),
		OPT_STRING_LIST(0, "reference", &reference,
			   N_("repo"),
			   N_("reference repository")),
		OPT_STRING(0, "depth", &depth,
			   N_("string"),
			   N_("depth for shallow clones")),
		OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
		OPT_BOOL(0, "progress", &progress,
			   N_("force cloning progress")),
		OPT_END()
	};
 
	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
		   "[--reference <repository>] [--name <name>] [--depth <depth>] "
		   "--url <url> --path <path>"),
		NULL
	};
 
	argc = parse_options(argc, argv, prefix, module_clone_options,
			     git_submodule_helper_usage, 0);
 
	if (argc || !url || !path || !*path)
		usage_with_options(git_submodule_helper_usage,
				   module_clone_options);
 
	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
	sm_gitdir = xstrdup(absolute_path(sb.buf));
	strbuf_reset(&sb);
 
	if (!is_absolute_path(path)) {
		strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
		path = strbuf_detach(&sb, NULL);
	} else
		path = xstrdup(path);
 
	if (!file_exists(sm_gitdir)) {
		if (safe_create_leading_directories_const(sm_gitdir) < 0)
			die(_("could not create directory '%s'"), sm_gitdir);
 
		prepare_possible_alternates(name, &reference);
 
		if (clone_submodule(path, sm_gitdir, url, depth, &reference,
				    quiet, progress))
			die(_("clone of '%s' into submodule path '%s' failed"),
			    url, path);
	} else {
		if (safe_create_leading_directories_const(path) < 0)
			die(_("could not create directory '%s'"), path);
		strbuf_addf(&sb, "%s/index", sm_gitdir);
		unlink_or_warn(sb.buf);
		strbuf_reset(&sb);
	}
 
	/* Write a .git file in the submodule to redirect to the superproject. */
	strbuf_addf(&sb, "%s/.git", path);
	if (safe_create_leading_directories_const(sb.buf) < 0)
		die(_("could not create leading directories of '%s'"), sb.buf);
	submodule_dot_git = fopen(sb.buf, "w");
	if (!submodule_dot_git)
		die_errno(_("cannot open file '%s'"), sb.buf);
 
	fprintf_or_die(submodule_dot_git, "gitdir: %s\n",
		       relative_path(sm_gitdir, path, &rel_path));
	if (fclose(submodule_dot_git))
		die(_("could not close file %s"), sb.buf);
	strbuf_reset(&sb);
	strbuf_reset(&rel_path);
 
	/* Redirect the worktree of the submodule in the superproject's config */
	p = git_pathdup_submodule(path, "config");
	if (!p)
		die(_("could not get submodule directory for '%s'"), path);
	git_config_set_in_file(p, "core.worktree",
			       relative_path(path, sm_gitdir, &rel_path));
	strbuf_release(&sb);
	strbuf_release(&rel_path);
	free(sm_gitdir);
	free(path);
	free(p);
	return 0;
}
 
struct submodule_update_clone {
	/* index into 'list', the list of submodules to look into for cloning */
	int current;
	struct module_list list;
	unsigned warn_if_uninitialized : 1;
 
	/* update parameter passed via commandline */
	struct submodule_update_strategy update;
 
	/* configuration parameters which are passed on to the children */
	int progress;
	int quiet;
	int recommend_shallow;
	struct string_list references;
	const char *depth;
	const char *recursive_prefix;
	const char *prefix;
 
	/* Machine-readable status lines to be consumed by git-submodule.sh */
	struct string_list projectlines;
 
	/* If we want to stop as fast as possible and return an error */
	unsigned quickstop : 1;
 
	/* failed clones to be retried again */
	const struct cache_entry **failed_clones;
	int failed_clones_nr, failed_clones_alloc;
};
#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
	NULL, NULL, NULL, \
	STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 
 
static void next_submodule_warn_missing(struct submodule_update_clone *suc,
		struct strbuf *out, const char *displaypath)
{
	/*
	 * Only mention uninitialized submodules when their
	 * paths have been specified.
	 */
	if (suc->warn_if_uninitialized) {
		strbuf_addf(out,
			_("Submodule path '%s' not initialized"),
			displaypath);
		strbuf_addch(out, '\n');
		strbuf_addstr(out,
			_("Maybe you want to use 'update --init'?"));
		strbuf_addch(out, '\n');
	}
}
 
/**
 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 */
static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
					   struct child_process *child,
					   struct submodule_update_clone *suc,
					   struct strbuf *out)
{
	const struct submodule *sub = NULL;
	struct strbuf displaypath_sb = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	const char *displaypath = NULL;
	char *url = NULL;
	int needs_cloning = 0;
 
	if (ce_stage(ce)) {
		if (suc->recursive_prefix)
			strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
		else
			strbuf_addf(&sb, "%s", ce->name);
		strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
		strbuf_addch(out, '\n');
		goto cleanup;
	}
 
	sub = submodule_from_path(null_sha1, ce->name);
 
	if (suc->recursive_prefix)
		displaypath = relative_path(suc->recursive_prefix,
					    ce->name, &displaypath_sb);
	else
		displaypath = ce->name;
 
	if (!sub) {
		next_submodule_warn_missing(suc, out, displaypath);
		goto cleanup;
	}
 
	if (suc->update.type == SM_UPDATE_NONE
	    || (suc->update.type == SM_UPDATE_UNSPECIFIED
		&& sub->update_strategy.type == SM_UPDATE_NONE)) {
		strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
		strbuf_addch(out, '\n');
		goto cleanup;
	}
 
	/*
	 * Looking up the url in .git/config.
	 * We must not fall back to .gitmodules as we only want
	 * to process configured submodules.
	 */
	strbuf_reset(&sb);
	strbuf_addf(&sb, "submodule.%s.url", sub->name);
	git_config_get_string(sb.buf, &url);
	if (!url) {
		next_submodule_warn_missing(suc, out, displaypath);
		goto cleanup;
	}
 
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/.git", ce->name);
	needs_cloning = !file_exists(sb.buf);
 
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
			oid_to_hex(&ce->oid), ce_stage(ce),
			needs_cloning, ce->name);
	string_list_append(&suc->projectlines, sb.buf);
 
	if (!needs_cloning)
		goto cleanup;
 
	child->git_cmd = 1;
	child->no_stdin = 1;
	child->stdout_to_stderr = 1;
	child->err = -1;
	argv_array_push(&child->args, "submodule--helper");
	argv_array_push(&child->args, "clone");
	if (suc->progress)
		argv_array_push(&child->args, "--progress");
	if (suc->quiet)
		argv_array_push(&child->args, "--quiet");
	if (suc->prefix)
		argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
	if (suc->recommend_shallow && sub->recommend_shallow == 1)
		argv_array_push(&child->args, "--depth=1");
	argv_array_pushl(&child->args, "--path", sub->path, NULL);
	argv_array_pushl(&child->args, "--name", sub->name, NULL);
	argv_array_pushl(&child->args, "--url", url, NULL);
	if (suc->references.nr) {
		struct string_list_item *item;
		for_each_string_list_item(item, &suc->references)
			argv_array_pushl(&child->args, "--reference", item->string, NULL);
	}
	if (suc->depth)
		argv_array_push(&child->args, suc->depth);
 
cleanup:
	free(url);
	strbuf_reset(&displaypath_sb);
	strbuf_reset(&sb);
 
	return needs_cloning;
}
 
static int update_clone_get_next_task(struct child_process *child,
				      struct strbuf *err,
				      void *suc_cb,
				      void **idx_task_cb)
{
	struct submodule_update_clone *suc = suc_cb;
	const struct cache_entry *ce;
	int index;
 
	for (; suc->current < suc->list.nr; suc->current++) {
		ce = suc->list.entries[suc->current];
		if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
			int *p = xmalloc(sizeof(*p));
			*p = suc->current;
			*idx_task_cb = p;
			suc->current++;
			return 1;
		}
	}
 
	/*
	 * The loop above tried cloning each submodule once, now try the
	 * stragglers again, which we can imagine as an extension of the
	 * entry list.
	 */
	index = suc->current - suc->list.nr;
	if (index < suc->failed_clones_nr) {
		int *p;
		ce = suc->failed_clones[index];
		if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
			suc->current ++;
			strbuf_addstr(err, "BUG: submodule considered for "
					   "cloning, doesn't need cloning "
					   "any more?\n");
			return 0;
		}
		p = xmalloc(sizeof(*p));
		*p = suc->current;
		*idx_task_cb = p;
		suc->current ++;
		return 1;
	}
 
	return 0;
}
 
static int update_clone_start_failure(struct strbuf *err,
				      void *suc_cb,
				      void *idx_task_cb)
{
	struct submodule_update_clone *suc = suc_cb;
	suc->quickstop = 1;
	return 1;
}
 
static int update_clone_task_finished(int result,
				      struct strbuf *err,
				      void *suc_cb,
				      void *idx_task_cb)
{
	const struct cache_entry *ce;
	struct submodule_update_clone *suc = suc_cb;
 
	int *idxP = *(int**)idx_task_cb;
	int idx = *idxP;
	free(idxP);
 
	if (!result)
		return 0;
 
	if (idx < suc->list.nr) {
		ce  = suc->list.entries[idx];
		strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
			    ce->name);
		strbuf_addch(err, '\n');
		ALLOC_GROW(suc->failed_clones,
			   suc->failed_clones_nr + 1,
			   suc->failed_clones_alloc);
		suc->failed_clones[suc->failed_clones_nr++] = ce;
		return 0;
	} else {
		idx -= suc->list.nr;
		ce  = suc->failed_clones[idx];
		strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
			    ce->name);
		strbuf_addch(err, '\n');
		suc->quickstop = 1;
		return 1;
	}
 
	return 0;
}
 
static int update_clone(int argc, const char **argv, const char *prefix)
{
	const char *update = NULL;
	int max_jobs = -1;
	struct string_list_item *item;
	struct pathspec pathspec;
	struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
 
	struct option module_update_clone_options[] = {
		OPT_STRING(0, "prefix", &prefix,
			   N_("path"),
			   N_("path into the working tree")),
		OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
			   N_("path"),
			   N_("path into the working tree, across nested "
			      "submodule boundaries")),
		OPT_STRING(0, "update", &update,
			   N_("string"),
			   N_("rebase, merge, checkout or none")),
		OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
			   N_("reference repository")),
		OPT_STRING(0, "depth", &suc.depth, "<depth>",
			   N_("Create a shallow clone truncated to the "
			      "specified number of revisions")),
		OPT_INTEGER('j', "jobs", &max_jobs,
			    N_("parallel jobs")),
		OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
			    N_("whether the initial clone should follow the shallow recommendation")),
		OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
		OPT_BOOL(0, "progress", &suc.progress,
			    N_("force cloning progress")),
		OPT_END()
	};
 
	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
		NULL
	};
	suc.prefix = prefix;
 
	argc = parse_options(argc, argv, prefix, module_update_clone_options,
			     git_submodule_helper_usage, 0);
 
	if (update)
		if (parse_submodule_update_strategy(update, &suc.update) < 0)
			die(_("bad value for update parameter"));
 
	if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
		return 1;
 
	if (pathspec.nr)
		suc.warn_if_uninitialized = 1;
 
	/* Overlay the parsed .gitmodules file with .git/config */
	gitmodules_config();
	git_config(submodule_config, NULL);
 
	if (max_jobs < 0)
		max_jobs = parallel_submodules();
 
	run_processes_parallel(max_jobs,
			       update_clone_get_next_task,
			       update_clone_start_failure,
			       update_clone_task_finished,
			       &suc);
 
	/*
	 * We saved the output and put it out all at once now.
	 * That means:
	 * - the listener does not have to interleave their (checkout)
	 *   work with our fetching.  The writes involved in a
	 *   checkout involve more straightforward sequential I/O.
	 * - the listener can avoid doing any work if fetching failed.
	 */
	if (suc.quickstop)
		return 1;
 
	for_each_string_list_item(item, &suc.projectlines)
		utf8_fprintf(stdout, "%s", item->string);
 
	return 0;
}
 
static int resolve_relative_path(int argc, const char **argv, const char *prefix)
{
	struct strbuf sb = STRBUF_INIT;
	if (argc != 3)
		die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
 
	printf("%s", relative_path(argv[1], argv[2], &sb));
	strbuf_release(&sb);
	return 0;
}
 
static const char *remote_submodule_branch(const char *path)
{
	const struct submodule *sub;
	gitmodules_config();
	git_config(submodule_config, NULL);
 
	sub = submodule_from_path(null_sha1, path);
	if (!sub)
		return NULL;
 
	if (!sub->branch)
		return "master";
 
	if (!strcmp(sub->branch, ".")) {
		unsigned char sha1[20];
		const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
 
		if (!refname)
			die(_("No such ref: %s"), "HEAD");
 
		/* detached HEAD */
		if (!strcmp(refname, "HEAD"))
			die(_("Submodule (%s) branch configured to inherit "
			      "branch from superproject, but the superproject "
			      "is not on any branch"), sub->name);
 
		if (!skip_prefix(refname, "refs/heads/", &refname))
			die(_("Expecting a full ref name, got %s"), refname);
		return refname;
	}
 
	return sub->branch;
}
 
static int resolve_remote_submodule_branch(int argc, const char **argv,
		const char *prefix)
{
	const char *ret;
	struct strbuf sb = STRBUF_INIT;
	if (argc != 2)
		die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
 
	ret = remote_submodule_branch(argv[1]);
	if (!ret)
		die("submodule %s doesn't exist", argv[1]);
 
	printf("%s", ret);
	strbuf_release(&sb);
	return 0;
}
 
struct cmd_struct {
	const char *cmd;
	int (*fn)(int, const char **, const char *);
};
 
static struct cmd_struct commands[] = {
	{"list", module_list},
	{"name", module_name},
	{"clone", module_clone},
	{"update-clone", update_clone},
	{"relative-path", resolve_relative_path},
	{"resolve-relative-url", resolve_relative_url},
	{"resolve-relative-url-test", resolve_relative_url_test},
	{"init", module_init},
	{"remote-branch", resolve_remote_submodule_branch}
};
 
int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
{
	int i;
	if (argc < 2)
		die(_("submodule--helper subcommand must be "
		      "called with a subcommand"));
 
	for (i = 0; i < ARRAY_SIZE(commands); i++)
		if (!strcmp(argv[1], commands[i].cmd))
			return commands[i].fn(argc - 1, argv + 1, prefix);
 
	die(_("'%s' is not a valid submodule--helper "
	      "subcommand"), argv[1]);
}