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