Merge branch 'ag/rebase-p'
[git] / builtin / submodule--helper.c
1 #include "builtin.h"
2 #include "repository.h"
3 #include "cache.h"
4 #include "config.h"
5 #include "parse-options.h"
6 #include "quote.h"
7 #include "pathspec.h"
8 #include "dir.h"
9 #include "submodule.h"
10 #include "submodule-config.h"
11 #include "string-list.h"
12 #include "run-command.h"
13 #include "remote.h"
14 #include "refs.h"
15 #include "refspec.h"
16 #include "connect.h"
17 #include "revision.h"
18 #include "diffcore.h"
19 #include "diff.h"
20 #include "object-store.h"
21
22 #define OPT_QUIET (1 << 0)
23 #define OPT_CACHED (1 << 1)
24 #define OPT_RECURSIVE (1 << 2)
25 #define OPT_FORCE (1 << 3)
26
27 typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
28                                   void *cb_data);
29
30 static char *get_default_remote(void)
31 {
32         char *dest = NULL, *ret;
33         struct strbuf sb = STRBUF_INIT;
34         const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
35
36         if (!refname)
37                 die(_("No such ref: %s"), "HEAD");
38
39         /* detached HEAD */
40         if (!strcmp(refname, "HEAD"))
41                 return xstrdup("origin");
42
43         if (!skip_prefix(refname, "refs/heads/", &refname))
44                 die(_("Expecting a full ref name, got %s"), refname);
45
46         strbuf_addf(&sb, "branch.%s.remote", refname);
47         if (git_config_get_string(sb.buf, &dest))
48                 ret = xstrdup("origin");
49         else
50                 ret = dest;
51
52         strbuf_release(&sb);
53         return ret;
54 }
55
56 static int print_default_remote(int argc, const char **argv, const char *prefix)
57 {
58         char *remote;
59
60         if (argc != 1)
61                 die(_("submodule--helper print-default-remote takes no arguments"));
62
63         remote = get_default_remote();
64         if (remote)
65                 printf("%s\n", remote);
66
67         free(remote);
68         return 0;
69 }
70
71 static int starts_with_dot_slash(const char *str)
72 {
73         return str[0] == '.' && is_dir_sep(str[1]);
74 }
75
76 static int starts_with_dot_dot_slash(const char *str)
77 {
78         return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
79 }
80
81 /*
82  * Returns 1 if it was the last chop before ':'.
83  */
84 static int chop_last_dir(char **remoteurl, int is_relative)
85 {
86         char *rfind = find_last_dir_sep(*remoteurl);
87         if (rfind) {
88                 *rfind = '\0';
89                 return 0;
90         }
91
92         rfind = strrchr(*remoteurl, ':');
93         if (rfind) {
94                 *rfind = '\0';
95                 return 1;
96         }
97
98         if (is_relative || !strcmp(".", *remoteurl))
99                 die(_("cannot strip one component off url '%s'"),
100                         *remoteurl);
101
102         free(*remoteurl);
103         *remoteurl = xstrdup(".");
104         return 0;
105 }
106
107 /*
108  * The `url` argument is the URL that navigates to the submodule origin
109  * repo. When relative, this URL is relative to the superproject origin
110  * URL repo. The `up_path` argument, if specified, is the relative
111  * path that navigates from the submodule working tree to the superproject
112  * working tree. Returns the origin URL of the submodule.
113  *
114  * Return either an absolute URL or filesystem path (if the superproject
115  * origin URL is an absolute URL or filesystem path, respectively) or a
116  * relative file system path (if the superproject origin URL is a relative
117  * file system path).
118  *
119  * When the output is a relative file system path, the path is either
120  * relative to the submodule working tree, if up_path is specified, or to
121  * the superproject working tree otherwise.
122  *
123  * NEEDSWORK: This works incorrectly on the domain and protocol part.
124  * remote_url      url              outcome          expectation
125  * http://a.com/b  ../c             http://a.com/c   as is
126  * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
127  *                                                   ignore trailing slash in url
128  * http://a.com/b  ../../c          http://c         error out
129  * http://a.com/b  ../../../c       http:/c          error out
130  * http://a.com/b  ../../../../c    http:c           error out
131  * http://a.com/b  ../../../../../c    .:c           error out
132  * NEEDSWORK: Given how chop_last_dir() works, this function is broken
133  * when a local part has a colon in its path component, too.
134  */
135 static char *relative_url(const char *remote_url,
136                                 const char *url,
137                                 const char *up_path)
138 {
139         int is_relative = 0;
140         int colonsep = 0;
141         char *out;
142         char *remoteurl = xstrdup(remote_url);
143         struct strbuf sb = STRBUF_INIT;
144         size_t len = strlen(remoteurl);
145
146         if (is_dir_sep(remoteurl[len-1]))
147                 remoteurl[len-1] = '\0';
148
149         if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
150                 is_relative = 0;
151         else {
152                 is_relative = 1;
153                 /*
154                  * Prepend a './' to ensure all relative
155                  * remoteurls start with './' or '../'
156                  */
157                 if (!starts_with_dot_slash(remoteurl) &&
158                     !starts_with_dot_dot_slash(remoteurl)) {
159                         strbuf_reset(&sb);
160                         strbuf_addf(&sb, "./%s", remoteurl);
161                         free(remoteurl);
162                         remoteurl = strbuf_detach(&sb, NULL);
163                 }
164         }
165         /*
166          * When the url starts with '../', remove that and the
167          * last directory in remoteurl.
168          */
169         while (url) {
170                 if (starts_with_dot_dot_slash(url)) {
171                         url += 3;
172                         colonsep |= chop_last_dir(&remoteurl, is_relative);
173                 } else if (starts_with_dot_slash(url))
174                         url += 2;
175                 else
176                         break;
177         }
178         strbuf_reset(&sb);
179         strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
180         if (ends_with(url, "/"))
181                 strbuf_setlen(&sb, sb.len - 1);
182         free(remoteurl);
183
184         if (starts_with_dot_slash(sb.buf))
185                 out = xstrdup(sb.buf + 2);
186         else
187                 out = xstrdup(sb.buf);
188         strbuf_reset(&sb);
189
190         if (!up_path || !is_relative)
191                 return out;
192
193         strbuf_addf(&sb, "%s%s", up_path, out);
194         free(out);
195         return strbuf_detach(&sb, NULL);
196 }
197
198 static int resolve_relative_url(int argc, const char **argv, const char *prefix)
199 {
200         char *remoteurl = NULL;
201         char *remote = get_default_remote();
202         const char *up_path = NULL;
203         char *res;
204         const char *url;
205         struct strbuf sb = STRBUF_INIT;
206
207         if (argc != 2 && argc != 3)
208                 die("resolve-relative-url only accepts one or two arguments");
209
210         url = argv[1];
211         strbuf_addf(&sb, "remote.%s.url", remote);
212         free(remote);
213
214         if (git_config_get_string(sb.buf, &remoteurl))
215                 /* the repository is its own authoritative upstream */
216                 remoteurl = xgetcwd();
217
218         if (argc == 3)
219                 up_path = argv[2];
220
221         res = relative_url(remoteurl, url, up_path);
222         puts(res);
223         free(res);
224         free(remoteurl);
225         return 0;
226 }
227
228 static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
229 {
230         char *remoteurl, *res;
231         const char *up_path, *url;
232
233         if (argc != 4)
234                 die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
235
236         up_path = argv[1];
237         remoteurl = xstrdup(argv[2]);
238         url = argv[3];
239
240         if (!strcmp(up_path, "(null)"))
241                 up_path = NULL;
242
243         res = relative_url(remoteurl, url, up_path);
244         puts(res);
245         free(res);
246         free(remoteurl);
247         return 0;
248 }
249
250 /* the result should be freed by the caller. */
251 static char *get_submodule_displaypath(const char *path, const char *prefix)
252 {
253         const char *super_prefix = get_super_prefix();
254
255         if (prefix && super_prefix) {
256                 BUG("cannot have prefix '%s' and superprefix '%s'",
257                     prefix, super_prefix);
258         } else if (prefix) {
259                 struct strbuf sb = STRBUF_INIT;
260                 char *displaypath = xstrdup(relative_path(path, prefix, &sb));
261                 strbuf_release(&sb);
262                 return displaypath;
263         } else if (super_prefix) {
264                 return xstrfmt("%s%s", super_prefix, path);
265         } else {
266                 return xstrdup(path);
267         }
268 }
269
270 static char *compute_rev_name(const char *sub_path, const char* object_id)
271 {
272         struct strbuf sb = STRBUF_INIT;
273         const char ***d;
274
275         static const char *describe_bare[] = { NULL };
276
277         static const char *describe_tags[] = { "--tags", NULL };
278
279         static const char *describe_contains[] = { "--contains", NULL };
280
281         static const char *describe_all_always[] = { "--all", "--always", NULL };
282
283         static const char **describe_argv[] = { describe_bare, describe_tags,
284                                                 describe_contains,
285                                                 describe_all_always, NULL };
286
287         for (d = describe_argv; *d; d++) {
288                 struct child_process cp = CHILD_PROCESS_INIT;
289                 prepare_submodule_repo_env(&cp.env_array);
290                 cp.dir = sub_path;
291                 cp.git_cmd = 1;
292                 cp.no_stderr = 1;
293
294                 argv_array_push(&cp.args, "describe");
295                 argv_array_pushv(&cp.args, *d);
296                 argv_array_push(&cp.args, object_id);
297
298                 if (!capture_command(&cp, &sb, 0)) {
299                         strbuf_strip_suffix(&sb, "\n");
300                         return strbuf_detach(&sb, NULL);
301                 }
302         }
303
304         strbuf_release(&sb);
305         return NULL;
306 }
307
308 struct module_list {
309         const struct cache_entry **entries;
310         int alloc, nr;
311 };
312 #define MODULE_LIST_INIT { NULL, 0, 0 }
313
314 static int module_list_compute(int argc, const char **argv,
315                                const char *prefix,
316                                struct pathspec *pathspec,
317                                struct module_list *list)
318 {
319         int i, result = 0;
320         char *ps_matched = NULL;
321         parse_pathspec(pathspec, 0,
322                        PATHSPEC_PREFER_FULL,
323                        prefix, argv);
324
325         if (pathspec->nr)
326                 ps_matched = xcalloc(pathspec->nr, 1);
327
328         if (read_cache() < 0)
329                 die(_("index file corrupt"));
330
331         for (i = 0; i < active_nr; i++) {
332                 const struct cache_entry *ce = active_cache[i];
333
334                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
335                                     0, ps_matched, 1) ||
336                     !S_ISGITLINK(ce->ce_mode))
337                         continue;
338
339                 ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
340                 list->entries[list->nr++] = ce;
341                 while (i + 1 < active_nr &&
342                        !strcmp(ce->name, active_cache[i + 1]->name))
343                         /*
344                          * Skip entries with the same name in different stages
345                          * to make sure an entry is returned only once.
346                          */
347                         i++;
348         }
349
350         if (ps_matched && report_path_error(ps_matched, pathspec, prefix))
351                 result = -1;
352
353         free(ps_matched);
354
355         return result;
356 }
357
358 static void module_list_active(struct module_list *list)
359 {
360         int i;
361         struct module_list active_modules = MODULE_LIST_INIT;
362
363         for (i = 0; i < list->nr; i++) {
364                 const struct cache_entry *ce = list->entries[i];
365
366                 if (!is_submodule_active(the_repository, ce->name))
367                         continue;
368
369                 ALLOC_GROW(active_modules.entries,
370                            active_modules.nr + 1,
371                            active_modules.alloc);
372                 active_modules.entries[active_modules.nr++] = ce;
373         }
374
375         free(list->entries);
376         *list = active_modules;
377 }
378
379 static char *get_up_path(const char *path)
380 {
381         int i;
382         struct strbuf sb = STRBUF_INIT;
383
384         for (i = count_slashes(path); i; i--)
385                 strbuf_addstr(&sb, "../");
386
387         /*
388          * Check if 'path' ends with slash or not
389          * for having the same output for dir/sub_dir
390          * and dir/sub_dir/
391          */
392         if (!is_dir_sep(path[strlen(path) - 1]))
393                 strbuf_addstr(&sb, "../");
394
395         return strbuf_detach(&sb, NULL);
396 }
397
398 static int module_list(int argc, const char **argv, const char *prefix)
399 {
400         int i;
401         struct pathspec pathspec;
402         struct module_list list = MODULE_LIST_INIT;
403
404         struct option module_list_options[] = {
405                 OPT_STRING(0, "prefix", &prefix,
406                            N_("path"),
407                            N_("alternative anchor for relative paths")),
408                 OPT_END()
409         };
410
411         const char *const git_submodule_helper_usage[] = {
412                 N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
413                 NULL
414         };
415
416         argc = parse_options(argc, argv, prefix, module_list_options,
417                              git_submodule_helper_usage, 0);
418
419         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
420                 return 1;
421
422         for (i = 0; i < list.nr; i++) {
423                 const struct cache_entry *ce = list.entries[i];
424
425                 if (ce_stage(ce))
426                         printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
427                 else
428                         printf("%06o %s %d\t", ce->ce_mode,
429                                oid_to_hex(&ce->oid), ce_stage(ce));
430
431                 fprintf(stdout, "%s\n", ce->name);
432         }
433         return 0;
434 }
435
436 static void for_each_listed_submodule(const struct module_list *list,
437                                       each_submodule_fn fn, void *cb_data)
438 {
439         int i;
440         for (i = 0; i < list->nr; i++)
441                 fn(list->entries[i], cb_data);
442 }
443
444 struct cb_foreach {
445         int argc;
446         const char **argv;
447         const char *prefix;
448         int quiet;
449         int recursive;
450 };
451 #define CB_FOREACH_INIT { 0 }
452
453 static void runcommand_in_submodule_cb(const struct cache_entry *list_item,
454                                        void *cb_data)
455 {
456         struct cb_foreach *info = cb_data;
457         const char *path = list_item->name;
458         const struct object_id *ce_oid = &list_item->oid;
459
460         const struct submodule *sub;
461         struct child_process cp = CHILD_PROCESS_INIT;
462         char *displaypath;
463
464         displaypath = get_submodule_displaypath(path, info->prefix);
465
466         sub = submodule_from_path(the_repository, &null_oid, path);
467
468         if (!sub)
469                 die(_("No url found for submodule path '%s' in .gitmodules"),
470                         displaypath);
471
472         if (!is_submodule_populated_gently(path, NULL))
473                 goto cleanup;
474
475         prepare_submodule_repo_env(&cp.env_array);
476
477         /*
478          * For the purpose of executing <command> in the submodule,
479          * separate shell is used for the purpose of running the
480          * child process.
481          */
482         cp.use_shell = 1;
483         cp.dir = path;
484
485         /*
486          * NEEDSWORK: the command currently has access to the variables $name,
487          * $sm_path, $displaypath, $sha1 and $toplevel only when the command
488          * contains a single argument. This is done for maintaining a faithful
489          * translation from shell script.
490          */
491         if (info->argc == 1) {
492                 char *toplevel = xgetcwd();
493                 struct strbuf sb = STRBUF_INIT;
494
495                 argv_array_pushf(&cp.env_array, "name=%s", sub->name);
496                 argv_array_pushf(&cp.env_array, "sm_path=%s", path);
497                 argv_array_pushf(&cp.env_array, "displaypath=%s", displaypath);
498                 argv_array_pushf(&cp.env_array, "sha1=%s",
499                                 oid_to_hex(ce_oid));
500                 argv_array_pushf(&cp.env_array, "toplevel=%s", toplevel);
501
502                 /*
503                  * Since the path variable was accessible from the script
504                  * before porting, it is also made available after porting.
505                  * The environment variable "PATH" has a very special purpose
506                  * on windows. And since environment variables are
507                  * case-insensitive in windows, it interferes with the
508                  * existing PATH variable. Hence, to avoid that, we expose
509                  * path via the args argv_array and not via env_array.
510                  */
511                 sq_quote_buf(&sb, path);
512                 argv_array_pushf(&cp.args, "path=%s; %s",
513                                  sb.buf, info->argv[0]);
514                 strbuf_release(&sb);
515                 free(toplevel);
516         } else {
517                 argv_array_pushv(&cp.args, info->argv);
518         }
519
520         if (!info->quiet)
521                 printf(_("Entering '%s'\n"), displaypath);
522
523         if (info->argv[0] && run_command(&cp))
524                 die(_("run_command returned non-zero status for %s\n."),
525                         displaypath);
526
527         if (info->recursive) {
528                 struct child_process cpr = CHILD_PROCESS_INIT;
529
530                 cpr.git_cmd = 1;
531                 cpr.dir = path;
532                 prepare_submodule_repo_env(&cpr.env_array);
533
534                 argv_array_pushl(&cpr.args, "--super-prefix", NULL);
535                 argv_array_pushf(&cpr.args, "%s/", displaypath);
536                 argv_array_pushl(&cpr.args, "submodule--helper", "foreach", "--recursive",
537                                 NULL);
538
539                 if (info->quiet)
540                         argv_array_push(&cpr.args, "--quiet");
541
542                 argv_array_pushv(&cpr.args, info->argv);
543
544                 if (run_command(&cpr))
545                         die(_("run_command returned non-zero status while"
546                                 "recursing in the nested submodules of %s\n."),
547                                 displaypath);
548         }
549
550 cleanup:
551         free(displaypath);
552 }
553
554 static int module_foreach(int argc, const char **argv, const char *prefix)
555 {
556         struct cb_foreach info = CB_FOREACH_INIT;
557         struct pathspec pathspec;
558         struct module_list list = MODULE_LIST_INIT;
559
560         struct option module_foreach_options[] = {
561                 OPT__QUIET(&info.quiet, N_("Suppress output of entering each submodule command")),
562                 OPT_BOOL(0, "recursive", &info.recursive,
563                          N_("Recurse into nested submodules")),
564                 OPT_END()
565         };
566
567         const char *const git_submodule_helper_usage[] = {
568                 N_("git submodule--helper foreach [--quiet] [--recursive] <command>"),
569                 NULL
570         };
571
572         argc = parse_options(argc, argv, prefix, module_foreach_options,
573                              git_submodule_helper_usage, PARSE_OPT_KEEP_UNKNOWN);
574
575         if (module_list_compute(0, NULL, prefix, &pathspec, &list) < 0)
576                 return 1;
577
578         info.argc = argc;
579         info.argv = argv;
580         info.prefix = prefix;
581
582         for_each_listed_submodule(&list, runcommand_in_submodule_cb, &info);
583
584         return 0;
585 }
586
587 struct init_cb {
588         const char *prefix;
589         unsigned int flags;
590 };
591
592 #define INIT_CB_INIT { NULL, 0 }
593
594 static void init_submodule(const char *path, const char *prefix,
595                            unsigned int flags)
596 {
597         const struct submodule *sub;
598         struct strbuf sb = STRBUF_INIT;
599         char *upd = NULL, *url = NULL, *displaypath;
600
601         displaypath = get_submodule_displaypath(path, prefix);
602
603         sub = submodule_from_path(the_repository, &null_oid, path);
604
605         if (!sub)
606                 die(_("No url found for submodule path '%s' in .gitmodules"),
607                         displaypath);
608
609         /*
610          * NEEDSWORK: In a multi-working-tree world, this needs to be
611          * set in the per-worktree config.
612          *
613          * Set active flag for the submodule being initialized
614          */
615         if (!is_submodule_active(the_repository, path)) {
616                 strbuf_addf(&sb, "submodule.%s.active", sub->name);
617                 git_config_set_gently(sb.buf, "true");
618                 strbuf_reset(&sb);
619         }
620
621         /*
622          * Copy url setting when it is not set yet.
623          * To look up the url in .git/config, we must not fall back to
624          * .gitmodules, so look it up directly.
625          */
626         strbuf_addf(&sb, "submodule.%s.url", sub->name);
627         if (git_config_get_string(sb.buf, &url)) {
628                 if (!sub->url)
629                         die(_("No url found for submodule path '%s' in .gitmodules"),
630                                 displaypath);
631
632                 url = xstrdup(sub->url);
633
634                 /* Possibly a url relative to parent */
635                 if (starts_with_dot_dot_slash(url) ||
636                     starts_with_dot_slash(url)) {
637                         char *remoteurl, *relurl;
638                         char *remote = get_default_remote();
639                         struct strbuf remotesb = STRBUF_INIT;
640                         strbuf_addf(&remotesb, "remote.%s.url", remote);
641                         free(remote);
642
643                         if (git_config_get_string(remotesb.buf, &remoteurl)) {
644                                 warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf);
645                                 remoteurl = xgetcwd();
646                         }
647                         relurl = relative_url(remoteurl, url, NULL);
648                         strbuf_release(&remotesb);
649                         free(remoteurl);
650                         free(url);
651                         url = relurl;
652                 }
653
654                 if (git_config_set_gently(sb.buf, url))
655                         die(_("Failed to register url for submodule path '%s'"),
656                             displaypath);
657                 if (!(flags & OPT_QUIET))
658                         fprintf(stderr,
659                                 _("Submodule '%s' (%s) registered for path '%s'\n"),
660                                 sub->name, url, displaypath);
661         }
662         strbuf_reset(&sb);
663
664         /* Copy "update" setting when it is not set yet */
665         strbuf_addf(&sb, "submodule.%s.update", sub->name);
666         if (git_config_get_string(sb.buf, &upd) &&
667             sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
668                 if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
669                         fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
670                                 sub->name);
671                         upd = xstrdup("none");
672                 } else
673                         upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));
674
675                 if (git_config_set_gently(sb.buf, upd))
676                         die(_("Failed to register update mode for submodule path '%s'"), displaypath);
677         }
678         strbuf_release(&sb);
679         free(displaypath);
680         free(url);
681         free(upd);
682 }
683
684 static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
685 {
686         struct init_cb *info = cb_data;
687         init_submodule(list_item->name, info->prefix, info->flags);
688 }
689
690 static int module_init(int argc, const char **argv, const char *prefix)
691 {
692         struct init_cb info = INIT_CB_INIT;
693         struct pathspec pathspec;
694         struct module_list list = MODULE_LIST_INIT;
695         int quiet = 0;
696
697         struct option module_init_options[] = {
698                 OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
699                 OPT_END()
700         };
701
702         const char *const git_submodule_helper_usage[] = {
703                 N_("git submodule--helper init [<path>]"),
704                 NULL
705         };
706
707         argc = parse_options(argc, argv, prefix, module_init_options,
708                              git_submodule_helper_usage, 0);
709
710         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
711                 return 1;
712
713         /*
714          * If there are no path args and submodule.active is set then,
715          * by default, only initialize 'active' modules.
716          */
717         if (!argc && git_config_get_value_multi("submodule.active"))
718                 module_list_active(&list);
719
720         info.prefix = prefix;
721         if (quiet)
722                 info.flags |= OPT_QUIET;
723
724         for_each_listed_submodule(&list, init_submodule_cb, &info);
725
726         return 0;
727 }
728
729 struct status_cb {
730         const char *prefix;
731         unsigned int flags;
732 };
733
734 #define STATUS_CB_INIT { NULL, 0 }
735
736 static void print_status(unsigned int flags, char state, const char *path,
737                          const struct object_id *oid, const char *displaypath)
738 {
739         if (flags & OPT_QUIET)
740                 return;
741
742         printf("%c%s %s", state, oid_to_hex(oid), displaypath);
743
744         if (state == ' ' || state == '+') {
745                 const char *name = compute_rev_name(path, oid_to_hex(oid));
746
747                 if (name)
748                         printf(" (%s)", name);
749         }
750
751         printf("\n");
752 }
753
754 static int handle_submodule_head_ref(const char *refname,
755                                      const struct object_id *oid, int flags,
756                                      void *cb_data)
757 {
758         struct object_id *output = cb_data;
759         if (oid)
760                 oidcpy(output, oid);
761
762         return 0;
763 }
764
765 static void status_submodule(const char *path, const struct object_id *ce_oid,
766                              unsigned int ce_flags, const char *prefix,
767                              unsigned int flags)
768 {
769         char *displaypath;
770         struct argv_array diff_files_args = ARGV_ARRAY_INIT;
771         struct rev_info rev;
772         int diff_files_result;
773
774         if (!submodule_from_path(the_repository, &null_oid, path))
775                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
776                       path);
777
778         displaypath = get_submodule_displaypath(path, prefix);
779
780         if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
781                 print_status(flags, 'U', path, &null_oid, displaypath);
782                 goto cleanup;
783         }
784
785         if (!is_submodule_active(the_repository, path)) {
786                 print_status(flags, '-', path, ce_oid, displaypath);
787                 goto cleanup;
788         }
789
790         argv_array_pushl(&diff_files_args, "diff-files",
791                          "--ignore-submodules=dirty", "--quiet", "--",
792                          path, NULL);
793
794         git_config(git_diff_basic_config, NULL);
795         init_revisions(&rev, prefix);
796         rev.abbrev = 0;
797         diff_files_args.argc = setup_revisions(diff_files_args.argc,
798                                                diff_files_args.argv,
799                                                &rev, NULL);
800         diff_files_result = run_diff_files(&rev, 0);
801
802         if (!diff_result_code(&rev.diffopt, diff_files_result)) {
803                 print_status(flags, ' ', path, ce_oid,
804                              displaypath);
805         } else if (!(flags & OPT_CACHED)) {
806                 struct object_id oid;
807                 struct ref_store *refs = get_submodule_ref_store(path);
808
809                 if (!refs) {
810                         print_status(flags, '-', path, ce_oid, displaypath);
811                         goto cleanup;
812                 }
813                 if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
814                         die(_("could not resolve HEAD ref inside the "
815                               "submodule '%s'"), path);
816
817                 print_status(flags, '+', path, &oid, displaypath);
818         } else {
819                 print_status(flags, '+', path, ce_oid, displaypath);
820         }
821
822         if (flags & OPT_RECURSIVE) {
823                 struct child_process cpr = CHILD_PROCESS_INIT;
824
825                 cpr.git_cmd = 1;
826                 cpr.dir = path;
827                 prepare_submodule_repo_env(&cpr.env_array);
828
829                 argv_array_push(&cpr.args, "--super-prefix");
830                 argv_array_pushf(&cpr.args, "%s/", displaypath);
831                 argv_array_pushl(&cpr.args, "submodule--helper", "status",
832                                  "--recursive", NULL);
833
834                 if (flags & OPT_CACHED)
835                         argv_array_push(&cpr.args, "--cached");
836
837                 if (flags & OPT_QUIET)
838                         argv_array_push(&cpr.args, "--quiet");
839
840                 if (run_command(&cpr))
841                         die(_("failed to recurse into submodule '%s'"), path);
842         }
843
844 cleanup:
845         argv_array_clear(&diff_files_args);
846         free(displaypath);
847 }
848
849 static void status_submodule_cb(const struct cache_entry *list_item,
850                                 void *cb_data)
851 {
852         struct status_cb *info = cb_data;
853         status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
854                          info->prefix, info->flags);
855 }
856
857 static int module_status(int argc, const char **argv, const char *prefix)
858 {
859         struct status_cb info = STATUS_CB_INIT;
860         struct pathspec pathspec;
861         struct module_list list = MODULE_LIST_INIT;
862         int quiet = 0;
863
864         struct option module_status_options[] = {
865                 OPT__QUIET(&quiet, N_("Suppress submodule status output")),
866                 OPT_BIT(0, "cached", &info.flags, N_("Use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
867                 OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
868                 OPT_END()
869         };
870
871         const char *const git_submodule_helper_usage[] = {
872                 N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
873                 NULL
874         };
875
876         argc = parse_options(argc, argv, prefix, module_status_options,
877                              git_submodule_helper_usage, 0);
878
879         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
880                 return 1;
881
882         info.prefix = prefix;
883         if (quiet)
884                 info.flags |= OPT_QUIET;
885
886         for_each_listed_submodule(&list, status_submodule_cb, &info);
887
888         return 0;
889 }
890
891 static int module_name(int argc, const char **argv, const char *prefix)
892 {
893         const struct submodule *sub;
894
895         if (argc != 2)
896                 usage(_("git submodule--helper name <path>"));
897
898         sub = submodule_from_path(the_repository, &null_oid, argv[1]);
899
900         if (!sub)
901                 die(_("no submodule mapping found in .gitmodules for path '%s'"),
902                     argv[1]);
903
904         printf("%s\n", sub->name);
905
906         return 0;
907 }
908
909 struct sync_cb {
910         const char *prefix;
911         unsigned int flags;
912 };
913
914 #define SYNC_CB_INIT { NULL, 0 }
915
916 static void sync_submodule(const char *path, const char *prefix,
917                            unsigned int flags)
918 {
919         const struct submodule *sub;
920         char *remote_key = NULL;
921         char *sub_origin_url, *super_config_url, *displaypath;
922         struct strbuf sb = STRBUF_INIT;
923         struct child_process cp = CHILD_PROCESS_INIT;
924         char *sub_config_path = NULL;
925
926         if (!is_submodule_active(the_repository, path))
927                 return;
928
929         sub = submodule_from_path(the_repository, &null_oid, path);
930
931         if (sub && sub->url) {
932                 if (starts_with_dot_dot_slash(sub->url) ||
933                     starts_with_dot_slash(sub->url)) {
934                         char *remote_url, *up_path;
935                         char *remote = get_default_remote();
936                         strbuf_addf(&sb, "remote.%s.url", remote);
937
938                         if (git_config_get_string(sb.buf, &remote_url))
939                                 remote_url = xgetcwd();
940
941                         up_path = get_up_path(path);
942                         sub_origin_url = relative_url(remote_url, sub->url, up_path);
943                         super_config_url = relative_url(remote_url, sub->url, NULL);
944
945                         free(remote);
946                         free(up_path);
947                         free(remote_url);
948                 } else {
949                         sub_origin_url = xstrdup(sub->url);
950                         super_config_url = xstrdup(sub->url);
951                 }
952         } else {
953                 sub_origin_url = xstrdup("");
954                 super_config_url = xstrdup("");
955         }
956
957         displaypath = get_submodule_displaypath(path, prefix);
958
959         if (!(flags & OPT_QUIET))
960                 printf(_("Synchronizing submodule url for '%s'\n"),
961                          displaypath);
962
963         strbuf_reset(&sb);
964         strbuf_addf(&sb, "submodule.%s.url", sub->name);
965         if (git_config_set_gently(sb.buf, super_config_url))
966                 die(_("failed to register url for submodule path '%s'"),
967                       displaypath);
968
969         if (!is_submodule_populated_gently(path, NULL))
970                 goto cleanup;
971
972         prepare_submodule_repo_env(&cp.env_array);
973         cp.git_cmd = 1;
974         cp.dir = path;
975         argv_array_pushl(&cp.args, "submodule--helper",
976                          "print-default-remote", NULL);
977
978         strbuf_reset(&sb);
979         if (capture_command(&cp, &sb, 0))
980                 die(_("failed to get the default remote for submodule '%s'"),
981                       path);
982
983         strbuf_strip_suffix(&sb, "\n");
984         remote_key = xstrfmt("remote.%s.url", sb.buf);
985
986         strbuf_reset(&sb);
987         submodule_to_gitdir(&sb, path);
988         strbuf_addstr(&sb, "/config");
989
990         if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
991                 die(_("failed to update remote for submodule '%s'"),
992                       path);
993
994         if (flags & OPT_RECURSIVE) {
995                 struct child_process cpr = CHILD_PROCESS_INIT;
996
997                 cpr.git_cmd = 1;
998                 cpr.dir = path;
999                 prepare_submodule_repo_env(&cpr.env_array);
1000
1001                 argv_array_push(&cpr.args, "--super-prefix");
1002                 argv_array_pushf(&cpr.args, "%s/", displaypath);
1003                 argv_array_pushl(&cpr.args, "submodule--helper", "sync",
1004                                  "--recursive", NULL);
1005
1006                 if (flags & OPT_QUIET)
1007                         argv_array_push(&cpr.args, "--quiet");
1008
1009                 if (run_command(&cpr))
1010                         die(_("failed to recurse into submodule '%s'"),
1011                               path);
1012         }
1013
1014 cleanup:
1015         free(super_config_url);
1016         free(sub_origin_url);
1017         strbuf_release(&sb);
1018         free(remote_key);
1019         free(displaypath);
1020         free(sub_config_path);
1021 }
1022
1023 static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
1024 {
1025         struct sync_cb *info = cb_data;
1026         sync_submodule(list_item->name, info->prefix, info->flags);
1027
1028 }
1029
1030 static int module_sync(int argc, const char **argv, const char *prefix)
1031 {
1032         struct sync_cb info = SYNC_CB_INIT;
1033         struct pathspec pathspec;
1034         struct module_list list = MODULE_LIST_INIT;
1035         int quiet = 0;
1036         int recursive = 0;
1037
1038         struct option module_sync_options[] = {
1039                 OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
1040                 OPT_BOOL(0, "recursive", &recursive,
1041                         N_("Recurse into nested submodules")),
1042                 OPT_END()
1043         };
1044
1045         const char *const git_submodule_helper_usage[] = {
1046                 N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
1047                 NULL
1048         };
1049
1050         argc = parse_options(argc, argv, prefix, module_sync_options,
1051                              git_submodule_helper_usage, 0);
1052
1053         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1054                 return 1;
1055
1056         info.prefix = prefix;
1057         if (quiet)
1058                 info.flags |= OPT_QUIET;
1059         if (recursive)
1060                 info.flags |= OPT_RECURSIVE;
1061
1062         for_each_listed_submodule(&list, sync_submodule_cb, &info);
1063
1064         return 0;
1065 }
1066
1067 struct deinit_cb {
1068         const char *prefix;
1069         unsigned int flags;
1070 };
1071 #define DEINIT_CB_INIT { NULL, 0 }
1072
1073 static void deinit_submodule(const char *path, const char *prefix,
1074                              unsigned int flags)
1075 {
1076         const struct submodule *sub;
1077         char *displaypath = NULL;
1078         struct child_process cp_config = CHILD_PROCESS_INIT;
1079         struct strbuf sb_config = STRBUF_INIT;
1080         char *sub_git_dir = xstrfmt("%s/.git", path);
1081
1082         sub = submodule_from_path(the_repository, &null_oid, path);
1083
1084         if (!sub || !sub->name)
1085                 goto cleanup;
1086
1087         displaypath = get_submodule_displaypath(path, prefix);
1088
1089         /* remove the submodule work tree (unless the user already did it) */
1090         if (is_directory(path)) {
1091                 struct strbuf sb_rm = STRBUF_INIT;
1092                 const char *format;
1093
1094                 /*
1095                  * protect submodules containing a .git directory
1096                  * NEEDSWORK: instead of dying, automatically call
1097                  * absorbgitdirs and (possibly) warn.
1098                  */
1099                 if (is_directory(sub_git_dir))
1100                         die(_("Submodule work tree '%s' contains a .git "
1101                               "directory (use 'rm -rf' if you really want "
1102                               "to remove it including all of its history)"),
1103                             displaypath);
1104
1105                 if (!(flags & OPT_FORCE)) {
1106                         struct child_process cp_rm = CHILD_PROCESS_INIT;
1107                         cp_rm.git_cmd = 1;
1108                         argv_array_pushl(&cp_rm.args, "rm", "-qn",
1109                                          path, NULL);
1110
1111                         if (run_command(&cp_rm))
1112                                 die(_("Submodule work tree '%s' contains local "
1113                                       "modifications; use '-f' to discard them"),
1114                                       displaypath);
1115                 }
1116
1117                 strbuf_addstr(&sb_rm, path);
1118
1119                 if (!remove_dir_recursively(&sb_rm, 0))
1120                         format = _("Cleared directory '%s'\n");
1121                 else
1122                         format = _("Could not remove submodule work tree '%s'\n");
1123
1124                 if (!(flags & OPT_QUIET))
1125                         printf(format, displaypath);
1126
1127                 submodule_unset_core_worktree(sub);
1128
1129                 strbuf_release(&sb_rm);
1130         }
1131
1132         if (mkdir(path, 0777))
1133                 printf(_("could not create empty submodule directory %s"),
1134                       displaypath);
1135
1136         cp_config.git_cmd = 1;
1137         argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
1138         argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
1139
1140         /* remove the .git/config entries (unless the user already did it) */
1141         if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
1142                 char *sub_key = xstrfmt("submodule.%s", sub->name);
1143                 /*
1144                  * remove the whole section so we have a clean state when
1145                  * the user later decides to init this submodule again
1146                  */
1147                 git_config_rename_section_in_file(NULL, sub_key, NULL);
1148                 if (!(flags & OPT_QUIET))
1149                         printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
1150                                  sub->name, sub->url, displaypath);
1151                 free(sub_key);
1152         }
1153
1154 cleanup:
1155         free(displaypath);
1156         free(sub_git_dir);
1157         strbuf_release(&sb_config);
1158 }
1159
1160 static void deinit_submodule_cb(const struct cache_entry *list_item,
1161                                 void *cb_data)
1162 {
1163         struct deinit_cb *info = cb_data;
1164         deinit_submodule(list_item->name, info->prefix, info->flags);
1165 }
1166
1167 static int module_deinit(int argc, const char **argv, const char *prefix)
1168 {
1169         struct deinit_cb info = DEINIT_CB_INIT;
1170         struct pathspec pathspec;
1171         struct module_list list = MODULE_LIST_INIT;
1172         int quiet = 0;
1173         int force = 0;
1174         int all = 0;
1175
1176         struct option module_deinit_options[] = {
1177                 OPT__QUIET(&quiet, N_("Suppress submodule status output")),
1178                 OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes"), 0),
1179                 OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
1180                 OPT_END()
1181         };
1182
1183         const char *const git_submodule_helper_usage[] = {
1184                 N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1185                 NULL
1186         };
1187
1188         argc = parse_options(argc, argv, prefix, module_deinit_options,
1189                              git_submodule_helper_usage, 0);
1190
1191         if (all && argc) {
1192                 error("pathspec and --all are incompatible");
1193                 usage_with_options(git_submodule_helper_usage,
1194                                    module_deinit_options);
1195         }
1196
1197         if (!argc && !all)
1198                 die(_("Use '--all' if you really want to deinitialize all submodules"));
1199
1200         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1201                 return 1;
1202
1203         info.prefix = prefix;
1204         if (quiet)
1205                 info.flags |= OPT_QUIET;
1206         if (force)
1207                 info.flags |= OPT_FORCE;
1208
1209         for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1210
1211         return 0;
1212 }
1213
1214 static int clone_submodule(const char *path, const char *gitdir, const char *url,
1215                            const char *depth, struct string_list *reference, int dissociate,
1216                            int quiet, int progress)
1217 {
1218         struct child_process cp = CHILD_PROCESS_INIT;
1219
1220         argv_array_push(&cp.args, "clone");
1221         argv_array_push(&cp.args, "--no-checkout");
1222         if (quiet)
1223                 argv_array_push(&cp.args, "--quiet");
1224         if (progress)
1225                 argv_array_push(&cp.args, "--progress");
1226         if (depth && *depth)
1227                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
1228         if (reference->nr) {
1229                 struct string_list_item *item;
1230                 for_each_string_list_item(item, reference)
1231                         argv_array_pushl(&cp.args, "--reference",
1232                                          item->string, NULL);
1233         }
1234         if (dissociate)
1235                 argv_array_push(&cp.args, "--dissociate");
1236         if (gitdir && *gitdir)
1237                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1238
1239         argv_array_push(&cp.args, url);
1240         argv_array_push(&cp.args, path);
1241
1242         cp.git_cmd = 1;
1243         prepare_submodule_repo_env(&cp.env_array);
1244         cp.no_stdin = 1;
1245
1246         return run_command(&cp);
1247 }
1248
1249 struct submodule_alternate_setup {
1250         const char *submodule_name;
1251         enum SUBMODULE_ALTERNATE_ERROR_MODE {
1252                 SUBMODULE_ALTERNATE_ERROR_DIE,
1253                 SUBMODULE_ALTERNATE_ERROR_INFO,
1254                 SUBMODULE_ALTERNATE_ERROR_IGNORE
1255         } error_mode;
1256         struct string_list *reference;
1257 };
1258 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1259         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1260
1261 static int add_possible_reference_from_superproject(
1262                 struct alternate_object_database *alt, void *sas_cb)
1263 {
1264         struct submodule_alternate_setup *sas = sas_cb;
1265
1266         /*
1267          * If the alternate object store is another repository, try the
1268          * standard layout with .git/(modules/<name>)+/objects
1269          */
1270         if (ends_with(alt->path, "/objects")) {
1271                 char *sm_alternate;
1272                 struct strbuf sb = STRBUF_INIT;
1273                 struct strbuf err = STRBUF_INIT;
1274                 strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
1275
1276                 /*
1277                  * We need to end the new path with '/' to mark it as a dir,
1278                  * otherwise a submodule name containing '/' will be broken
1279                  * as the last part of a missing submodule reference would
1280                  * be taken as a file name.
1281                  */
1282                 strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
1283
1284                 sm_alternate = compute_alternate_path(sb.buf, &err);
1285                 if (sm_alternate) {
1286                         string_list_append(sas->reference, xstrdup(sb.buf));
1287                         free(sm_alternate);
1288                 } else {
1289                         switch (sas->error_mode) {
1290                         case SUBMODULE_ALTERNATE_ERROR_DIE:
1291                                 die(_("submodule '%s' cannot add alternate: %s"),
1292                                     sas->submodule_name, err.buf);
1293                         case SUBMODULE_ALTERNATE_ERROR_INFO:
1294                                 fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
1295                                         sas->submodule_name, err.buf);
1296                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1297                                 ; /* nothing */
1298                         }
1299                 }
1300                 strbuf_release(&sb);
1301         }
1302
1303         return 0;
1304 }
1305
1306 static void prepare_possible_alternates(const char *sm_name,
1307                 struct string_list *reference)
1308 {
1309         char *sm_alternate = NULL, *error_strategy = NULL;
1310         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1311
1312         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1313         if (!sm_alternate)
1314                 return;
1315
1316         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1317
1318         if (!error_strategy)
1319                 error_strategy = xstrdup("die");
1320
1321         sas.submodule_name = sm_name;
1322         sas.reference = reference;
1323         if (!strcmp(error_strategy, "die"))
1324                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1325         else if (!strcmp(error_strategy, "info"))
1326                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1327         else if (!strcmp(error_strategy, "ignore"))
1328                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1329         else
1330                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1331
1332         if (!strcmp(sm_alternate, "superproject"))
1333                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1334         else if (!strcmp(sm_alternate, "no"))
1335                 ; /* do nothing */
1336         else
1337                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1338
1339         free(sm_alternate);
1340         free(error_strategy);
1341 }
1342
1343 static int module_clone(int argc, const char **argv, const char *prefix)
1344 {
1345         const char *name = NULL, *url = NULL, *depth = NULL;
1346         int quiet = 0;
1347         int progress = 0;
1348         char *p, *path = NULL, *sm_gitdir;
1349         struct strbuf sb = STRBUF_INIT;
1350         struct string_list reference = STRING_LIST_INIT_NODUP;
1351         int dissociate = 0;
1352         char *sm_alternate = NULL, *error_strategy = NULL;
1353
1354         struct option module_clone_options[] = {
1355                 OPT_STRING(0, "prefix", &prefix,
1356                            N_("path"),
1357                            N_("alternative anchor for relative paths")),
1358                 OPT_STRING(0, "path", &path,
1359                            N_("path"),
1360                            N_("where the new submodule will be cloned to")),
1361                 OPT_STRING(0, "name", &name,
1362                            N_("string"),
1363                            N_("name of the new submodule")),
1364                 OPT_STRING(0, "url", &url,
1365                            N_("string"),
1366                            N_("url where to clone the submodule from")),
1367                 OPT_STRING_LIST(0, "reference", &reference,
1368                            N_("repo"),
1369                            N_("reference repository")),
1370                 OPT_BOOL(0, "dissociate", &dissociate,
1371                            N_("use --reference only while cloning")),
1372                 OPT_STRING(0, "depth", &depth,
1373                            N_("string"),
1374                            N_("depth for shallow clones")),
1375                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1376                 OPT_BOOL(0, "progress", &progress,
1377                            N_("force cloning progress")),
1378                 OPT_END()
1379         };
1380
1381         const char *const git_submodule_helper_usage[] = {
1382                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1383                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
1384                    "--url <url> --path <path>"),
1385                 NULL
1386         };
1387
1388         argc = parse_options(argc, argv, prefix, module_clone_options,
1389                              git_submodule_helper_usage, 0);
1390
1391         if (argc || !url || !path || !*path)
1392                 usage_with_options(git_submodule_helper_usage,
1393                                    module_clone_options);
1394
1395         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1396         sm_gitdir = absolute_pathdup(sb.buf);
1397         strbuf_reset(&sb);
1398
1399         if (!is_absolute_path(path)) {
1400                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1401                 path = strbuf_detach(&sb, NULL);
1402         } else
1403                 path = xstrdup(path);
1404
1405         if (!file_exists(sm_gitdir)) {
1406                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
1407                         die(_("could not create directory '%s'"), sm_gitdir);
1408
1409                 prepare_possible_alternates(name, &reference);
1410
1411                 if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
1412                                     quiet, progress))
1413                         die(_("clone of '%s' into submodule path '%s' failed"),
1414                             url, path);
1415         } else {
1416                 if (safe_create_leading_directories_const(path) < 0)
1417                         die(_("could not create directory '%s'"), path);
1418                 strbuf_addf(&sb, "%s/index", sm_gitdir);
1419                 unlink_or_warn(sb.buf);
1420                 strbuf_reset(&sb);
1421         }
1422
1423         connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1424
1425         p = git_pathdup_submodule(path, "config");
1426         if (!p)
1427                 die(_("could not get submodule directory for '%s'"), path);
1428
1429         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1430         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1431         if (sm_alternate)
1432                 git_config_set_in_file(p, "submodule.alternateLocation",
1433                                            sm_alternate);
1434         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1435         if (error_strategy)
1436                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1437                                            error_strategy);
1438
1439         free(sm_alternate);
1440         free(error_strategy);
1441
1442         strbuf_release(&sb);
1443         free(sm_gitdir);
1444         free(path);
1445         free(p);
1446         return 0;
1447 }
1448
1449 struct submodule_update_clone {
1450         /* index into 'list', the list of submodules to look into for cloning */
1451         int current;
1452         struct module_list list;
1453         unsigned warn_if_uninitialized : 1;
1454
1455         /* update parameter passed via commandline */
1456         struct submodule_update_strategy update;
1457
1458         /* configuration parameters which are passed on to the children */
1459         int progress;
1460         int quiet;
1461         int recommend_shallow;
1462         struct string_list references;
1463         int dissociate;
1464         const char *depth;
1465         const char *recursive_prefix;
1466         const char *prefix;
1467
1468         /* Machine-readable status lines to be consumed by git-submodule.sh */
1469         struct string_list projectlines;
1470
1471         /* If we want to stop as fast as possible and return an error */
1472         unsigned quickstop : 1;
1473
1474         /* failed clones to be retried again */
1475         const struct cache_entry **failed_clones;
1476         int failed_clones_nr, failed_clones_alloc;
1477 };
1478 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
1479         SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
1480         NULL, NULL, NULL, \
1481         STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
1482
1483
1484 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
1485                 struct strbuf *out, const char *displaypath)
1486 {
1487         /*
1488          * Only mention uninitialized submodules when their
1489          * paths have been specified.
1490          */
1491         if (suc->warn_if_uninitialized) {
1492                 strbuf_addf(out,
1493                         _("Submodule path '%s' not initialized"),
1494                         displaypath);
1495                 strbuf_addch(out, '\n');
1496                 strbuf_addstr(out,
1497                         _("Maybe you want to use 'update --init'?"));
1498                 strbuf_addch(out, '\n');
1499         }
1500 }
1501
1502 /**
1503  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
1504  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
1505  */
1506 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
1507                                            struct child_process *child,
1508                                            struct submodule_update_clone *suc,
1509                                            struct strbuf *out)
1510 {
1511         const struct submodule *sub = NULL;
1512         const char *url = NULL;
1513         const char *update_string;
1514         enum submodule_update_type update_type;
1515         char *key;
1516         struct strbuf displaypath_sb = STRBUF_INIT;
1517         struct strbuf sb = STRBUF_INIT;
1518         const char *displaypath = NULL;
1519         int needs_cloning = 0;
1520
1521         if (ce_stage(ce)) {
1522                 if (suc->recursive_prefix)
1523                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
1524                 else
1525                         strbuf_addstr(&sb, ce->name);
1526                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
1527                 strbuf_addch(out, '\n');
1528                 goto cleanup;
1529         }
1530
1531         sub = submodule_from_path(the_repository, &null_oid, ce->name);
1532
1533         if (suc->recursive_prefix)
1534                 displaypath = relative_path(suc->recursive_prefix,
1535                                             ce->name, &displaypath_sb);
1536         else
1537                 displaypath = ce->name;
1538
1539         if (!sub) {
1540                 next_submodule_warn_missing(suc, out, displaypath);
1541                 goto cleanup;
1542         }
1543
1544         key = xstrfmt("submodule.%s.update", sub->name);
1545         if (!repo_config_get_string_const(the_repository, key, &update_string)) {
1546                 update_type = parse_submodule_update_type(update_string);
1547         } else {
1548                 update_type = sub->update_strategy.type;
1549         }
1550         free(key);
1551
1552         if (suc->update.type == SM_UPDATE_NONE
1553             || (suc->update.type == SM_UPDATE_UNSPECIFIED
1554                 && update_type == SM_UPDATE_NONE)) {
1555                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
1556                 strbuf_addch(out, '\n');
1557                 goto cleanup;
1558         }
1559
1560         /* Check if the submodule has been initialized. */
1561         if (!is_submodule_active(the_repository, ce->name)) {
1562                 next_submodule_warn_missing(suc, out, displaypath);
1563                 goto cleanup;
1564         }
1565
1566         strbuf_reset(&sb);
1567         strbuf_addf(&sb, "submodule.%s.url", sub->name);
1568         if (repo_config_get_string_const(the_repository, sb.buf, &url))
1569                 url = sub->url;
1570
1571         strbuf_reset(&sb);
1572         strbuf_addf(&sb, "%s/.git", ce->name);
1573         needs_cloning = !file_exists(sb.buf);
1574
1575         strbuf_reset(&sb);
1576         strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
1577                         oid_to_hex(&ce->oid), ce_stage(ce),
1578                         needs_cloning, ce->name);
1579         string_list_append(&suc->projectlines, sb.buf);
1580
1581         if (!needs_cloning)
1582                 goto cleanup;
1583
1584         child->git_cmd = 1;
1585         child->no_stdin = 1;
1586         child->stdout_to_stderr = 1;
1587         child->err = -1;
1588         argv_array_push(&child->args, "submodule--helper");
1589         argv_array_push(&child->args, "clone");
1590         if (suc->progress)
1591                 argv_array_push(&child->args, "--progress");
1592         if (suc->quiet)
1593                 argv_array_push(&child->args, "--quiet");
1594         if (suc->prefix)
1595                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
1596         if (suc->recommend_shallow && sub->recommend_shallow == 1)
1597                 argv_array_push(&child->args, "--depth=1");
1598         argv_array_pushl(&child->args, "--path", sub->path, NULL);
1599         argv_array_pushl(&child->args, "--name", sub->name, NULL);
1600         argv_array_pushl(&child->args, "--url", url, NULL);
1601         if (suc->references.nr) {
1602                 struct string_list_item *item;
1603                 for_each_string_list_item(item, &suc->references)
1604                         argv_array_pushl(&child->args, "--reference", item->string, NULL);
1605         }
1606         if (suc->dissociate)
1607                 argv_array_push(&child->args, "--dissociate");
1608         if (suc->depth)
1609                 argv_array_push(&child->args, suc->depth);
1610
1611 cleanup:
1612         strbuf_reset(&displaypath_sb);
1613         strbuf_reset(&sb);
1614
1615         return needs_cloning;
1616 }
1617
1618 static int update_clone_get_next_task(struct child_process *child,
1619                                       struct strbuf *err,
1620                                       void *suc_cb,
1621                                       void **idx_task_cb)
1622 {
1623         struct submodule_update_clone *suc = suc_cb;
1624         const struct cache_entry *ce;
1625         int index;
1626
1627         for (; suc->current < suc->list.nr; suc->current++) {
1628                 ce = suc->list.entries[suc->current];
1629                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
1630                         int *p = xmalloc(sizeof(*p));
1631                         *p = suc->current;
1632                         *idx_task_cb = p;
1633                         suc->current++;
1634                         return 1;
1635                 }
1636         }
1637
1638         /*
1639          * The loop above tried cloning each submodule once, now try the
1640          * stragglers again, which we can imagine as an extension of the
1641          * entry list.
1642          */
1643         index = suc->current - suc->list.nr;
1644         if (index < suc->failed_clones_nr) {
1645                 int *p;
1646                 ce = suc->failed_clones[index];
1647                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
1648                         suc->current ++;
1649                         strbuf_addstr(err, "BUG: submodule considered for "
1650                                            "cloning, doesn't need cloning "
1651                                            "any more?\n");
1652                         return 0;
1653                 }
1654                 p = xmalloc(sizeof(*p));
1655                 *p = suc->current;
1656                 *idx_task_cb = p;
1657                 suc->current ++;
1658                 return 1;
1659         }
1660
1661         return 0;
1662 }
1663
1664 static int update_clone_start_failure(struct strbuf *err,
1665                                       void *suc_cb,
1666                                       void *idx_task_cb)
1667 {
1668         struct submodule_update_clone *suc = suc_cb;
1669         suc->quickstop = 1;
1670         return 1;
1671 }
1672
1673 static int update_clone_task_finished(int result,
1674                                       struct strbuf *err,
1675                                       void *suc_cb,
1676                                       void *idx_task_cb)
1677 {
1678         const struct cache_entry *ce;
1679         struct submodule_update_clone *suc = suc_cb;
1680
1681         int *idxP = idx_task_cb;
1682         int idx = *idxP;
1683         free(idxP);
1684
1685         if (!result)
1686                 return 0;
1687
1688         if (idx < suc->list.nr) {
1689                 ce  = suc->list.entries[idx];
1690                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
1691                             ce->name);
1692                 strbuf_addch(err, '\n');
1693                 ALLOC_GROW(suc->failed_clones,
1694                            suc->failed_clones_nr + 1,
1695                            suc->failed_clones_alloc);
1696                 suc->failed_clones[suc->failed_clones_nr++] = ce;
1697                 return 0;
1698         } else {
1699                 idx -= suc->list.nr;
1700                 ce  = suc->failed_clones[idx];
1701                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
1702                             ce->name);
1703                 strbuf_addch(err, '\n');
1704                 suc->quickstop = 1;
1705                 return 1;
1706         }
1707
1708         return 0;
1709 }
1710
1711 static int git_update_clone_config(const char *var, const char *value,
1712                                    void *cb)
1713 {
1714         int *max_jobs = cb;
1715         if (!strcmp(var, "submodule.fetchjobs"))
1716                 *max_jobs = parse_submodule_fetchjobs(var, value);
1717         return 0;
1718 }
1719
1720 static int update_clone(int argc, const char **argv, const char *prefix)
1721 {
1722         const char *update = NULL;
1723         int max_jobs = 1;
1724         struct string_list_item *item;
1725         struct pathspec pathspec;
1726         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
1727
1728         struct option module_update_clone_options[] = {
1729                 OPT_STRING(0, "prefix", &prefix,
1730                            N_("path"),
1731                            N_("path into the working tree")),
1732                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
1733                            N_("path"),
1734                            N_("path into the working tree, across nested "
1735                               "submodule boundaries")),
1736                 OPT_STRING(0, "update", &update,
1737                            N_("string"),
1738                            N_("rebase, merge, checkout or none")),
1739                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1740                            N_("reference repository")),
1741                 OPT_BOOL(0, "dissociate", &suc.dissociate,
1742                            N_("use --reference only while cloning")),
1743                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
1744                            N_("Create a shallow clone truncated to the "
1745                               "specified number of revisions")),
1746                 OPT_INTEGER('j', "jobs", &max_jobs,
1747                             N_("parallel jobs")),
1748                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1749                             N_("whether the initial clone should follow the shallow recommendation")),
1750                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1751                 OPT_BOOL(0, "progress", &suc.progress,
1752                             N_("force cloning progress")),
1753                 OPT_END()
1754         };
1755
1756         const char *const git_submodule_helper_usage[] = {
1757                 N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1758                 NULL
1759         };
1760         suc.prefix = prefix;
1761
1762         update_clone_config_from_gitmodules(&max_jobs);
1763         git_config(git_update_clone_config, &max_jobs);
1764
1765         argc = parse_options(argc, argv, prefix, module_update_clone_options,
1766                              git_submodule_helper_usage, 0);
1767
1768         if (update)
1769                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
1770                         die(_("bad value for update parameter"));
1771
1772         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1773                 return 1;
1774
1775         if (pathspec.nr)
1776                 suc.warn_if_uninitialized = 1;
1777
1778         run_processes_parallel(max_jobs,
1779                                update_clone_get_next_task,
1780                                update_clone_start_failure,
1781                                update_clone_task_finished,
1782                                &suc);
1783
1784         /*
1785          * We saved the output and put it out all at once now.
1786          * That means:
1787          * - the listener does not have to interleave their (checkout)
1788          *   work with our fetching.  The writes involved in a
1789          *   checkout involve more straightforward sequential I/O.
1790          * - the listener can avoid doing any work if fetching failed.
1791          */
1792         if (suc.quickstop)
1793                 return 1;
1794
1795         for_each_string_list_item(item, &suc.projectlines)
1796                 fprintf(stdout, "%s", item->string);
1797
1798         return 0;
1799 }
1800
1801 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1802 {
1803         struct strbuf sb = STRBUF_INIT;
1804         if (argc != 3)
1805                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1806
1807         printf("%s", relative_path(argv[1], argv[2], &sb));
1808         strbuf_release(&sb);
1809         return 0;
1810 }
1811
1812 static const char *remote_submodule_branch(const char *path)
1813 {
1814         const struct submodule *sub;
1815         const char *branch = NULL;
1816         char *key;
1817
1818         sub = submodule_from_path(the_repository, &null_oid, path);
1819         if (!sub)
1820                 return NULL;
1821
1822         key = xstrfmt("submodule.%s.branch", sub->name);
1823         if (repo_config_get_string_const(the_repository, key, &branch))
1824                 branch = sub->branch;
1825         free(key);
1826
1827         if (!branch)
1828                 return "master";
1829
1830         if (!strcmp(branch, ".")) {
1831                 const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1832
1833                 if (!refname)
1834                         die(_("No such ref: %s"), "HEAD");
1835
1836                 /* detached HEAD */
1837                 if (!strcmp(refname, "HEAD"))
1838                         die(_("Submodule (%s) branch configured to inherit "
1839                               "branch from superproject, but the superproject "
1840                               "is not on any branch"), sub->name);
1841
1842                 if (!skip_prefix(refname, "refs/heads/", &refname))
1843                         die(_("Expecting a full ref name, got %s"), refname);
1844                 return refname;
1845         }
1846
1847         return branch;
1848 }
1849
1850 static int resolve_remote_submodule_branch(int argc, const char **argv,
1851                 const char *prefix)
1852 {
1853         const char *ret;
1854         struct strbuf sb = STRBUF_INIT;
1855         if (argc != 2)
1856                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1857
1858         ret = remote_submodule_branch(argv[1]);
1859         if (!ret)
1860                 die("submodule %s doesn't exist", argv[1]);
1861
1862         printf("%s", ret);
1863         strbuf_release(&sb);
1864         return 0;
1865 }
1866
1867 static int push_check(int argc, const char **argv, const char *prefix)
1868 {
1869         struct remote *remote;
1870         const char *superproject_head;
1871         char *head;
1872         int detached_head = 0;
1873         struct object_id head_oid;
1874
1875         if (argc < 3)
1876                 die("submodule--helper push-check requires at least 2 arguments");
1877
1878         /*
1879          * superproject's resolved head ref.
1880          * if HEAD then the superproject is in a detached head state, otherwise
1881          * it will be the resolved head ref.
1882          */
1883         superproject_head = argv[1];
1884         argv++;
1885         argc--;
1886         /* Get the submodule's head ref and determine if it is detached */
1887         head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1888         if (!head)
1889                 die(_("Failed to resolve HEAD as a valid ref."));
1890         if (!strcmp(head, "HEAD"))
1891                 detached_head = 1;
1892
1893         /*
1894          * The remote must be configured.
1895          * This is to avoid pushing to the exact same URL as the parent.
1896          */
1897         remote = pushremote_get(argv[1]);
1898         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1899                 die("remote '%s' not configured", argv[1]);
1900
1901         /* Check the refspec */
1902         if (argc > 2) {
1903                 int i;
1904                 struct ref *local_refs = get_local_heads();
1905                 struct refspec refspec = REFSPEC_INIT_PUSH;
1906
1907                 refspec_appendn(&refspec, argv + 2, argc - 2);
1908
1909                 for (i = 0; i < refspec.nr; i++) {
1910                         const struct refspec_item *rs = &refspec.items[i];
1911
1912                         if (rs->pattern || rs->matching)
1913                                 continue;
1914
1915                         /* LHS must match a single ref */
1916                         switch (count_refspec_match(rs->src, local_refs, NULL)) {
1917                         case 1:
1918                                 break;
1919                         case 0:
1920                                 /*
1921                                  * If LHS matches 'HEAD' then we need to ensure
1922                                  * that it matches the same named branch
1923                                  * checked out in the superproject.
1924                                  */
1925                                 if (!strcmp(rs->src, "HEAD")) {
1926                                         if (!detached_head &&
1927                                             !strcmp(head, superproject_head))
1928                                                 break;
1929                                         die("HEAD does not match the named branch in the superproject");
1930                                 }
1931                                 /* fallthrough */
1932                         default:
1933                                 die("src refspec '%s' must name a ref",
1934                                     rs->src);
1935                         }
1936                 }
1937                 refspec_clear(&refspec);
1938         }
1939         free(head);
1940
1941         return 0;
1942 }
1943
1944 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1945 {
1946         int i;
1947         struct pathspec pathspec;
1948         struct module_list list = MODULE_LIST_INIT;
1949         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1950
1951         struct option embed_gitdir_options[] = {
1952                 OPT_STRING(0, "prefix", &prefix,
1953                            N_("path"),
1954                            N_("path into the working tree")),
1955                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1956                         ABSORB_GITDIR_RECURSE_SUBMODULES),
1957                 OPT_END()
1958         };
1959
1960         const char *const git_submodule_helper_usage[] = {
1961                 N_("git submodule--helper embed-git-dir [<path>...]"),
1962                 NULL
1963         };
1964
1965         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1966                              git_submodule_helper_usage, 0);
1967
1968         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1969                 return 1;
1970
1971         for (i = 0; i < list.nr; i++)
1972                 absorb_git_dir_into_superproject(prefix,
1973                                 list.entries[i]->name, flags);
1974
1975         return 0;
1976 }
1977
1978 static int is_active(int argc, const char **argv, const char *prefix)
1979 {
1980         if (argc != 2)
1981                 die("submodule--helper is-active takes exactly 1 argument");
1982
1983         return !is_submodule_active(the_repository, argv[1]);
1984 }
1985
1986 /*
1987  * Exit non-zero if any of the submodule names given on the command line is
1988  * invalid. If no names are given, filter stdin to print only valid names
1989  * (which is primarily intended for testing).
1990  */
1991 static int check_name(int argc, const char **argv, const char *prefix)
1992 {
1993         if (argc > 1) {
1994                 while (*++argv) {
1995                         if (check_submodule_name(*argv) < 0)
1996                                 return 1;
1997                 }
1998         } else {
1999                 struct strbuf buf = STRBUF_INIT;
2000                 while (strbuf_getline(&buf, stdin) != EOF) {
2001                         if (!check_submodule_name(buf.buf))
2002                                 printf("%s\n", buf.buf);
2003                 }
2004                 strbuf_release(&buf);
2005         }
2006         return 0;
2007 }
2008
2009 static int connect_gitdir_workingtree(int argc, const char **argv, const char *prefix)
2010 {
2011         struct strbuf sb = STRBUF_INIT;
2012         const char *name, *path;
2013         char *sm_gitdir;
2014
2015         if (argc != 3)
2016                 BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
2017
2018         name = argv[1];
2019         path = argv[2];
2020
2021         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
2022         sm_gitdir = absolute_pathdup(sb.buf);
2023
2024         connect_work_tree_and_git_dir(path, sm_gitdir, 0);
2025
2026         strbuf_release(&sb);
2027         free(sm_gitdir);
2028
2029         return 0;
2030 }
2031
2032 #define SUPPORT_SUPER_PREFIX (1<<0)
2033
2034 struct cmd_struct {
2035         const char *cmd;
2036         int (*fn)(int, const char **, const char *);
2037         unsigned option;
2038 };
2039
2040 static struct cmd_struct commands[] = {
2041         {"list", module_list, 0},
2042         {"name", module_name, 0},
2043         {"clone", module_clone, 0},
2044         {"update-clone", update_clone, 0},
2045         {"connect-gitdir-workingtree", connect_gitdir_workingtree, 0},
2046         {"relative-path", resolve_relative_path, 0},
2047         {"resolve-relative-url", resolve_relative_url, 0},
2048         {"resolve-relative-url-test", resolve_relative_url_test, 0},
2049         {"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
2050         {"init", module_init, SUPPORT_SUPER_PREFIX},
2051         {"status", module_status, SUPPORT_SUPER_PREFIX},
2052         {"print-default-remote", print_default_remote, 0},
2053         {"sync", module_sync, SUPPORT_SUPER_PREFIX},
2054         {"deinit", module_deinit, 0},
2055         {"remote-branch", resolve_remote_submodule_branch, 0},
2056         {"push-check", push_check, 0},
2057         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
2058         {"is-active", is_active, 0},
2059         {"check-name", check_name, 0},
2060 };
2061
2062 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
2063 {
2064         int i;
2065         if (argc < 2 || !strcmp(argv[1], "-h"))
2066                 usage("git submodule--helper <command>");
2067
2068         for (i = 0; i < ARRAY_SIZE(commands); i++) {
2069                 if (!strcmp(argv[1], commands[i].cmd)) {
2070                         if (get_super_prefix() &&
2071                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
2072                                 die(_("%s doesn't support --super-prefix"),
2073                                     commands[i].cmd);
2074                         return commands[i].fn(argc - 1, argv + 1, prefix);
2075                 }
2076         }
2077
2078         die(_("'%s' is not a valid submodule--helper "
2079               "subcommand"), argv[1]);
2080 }