Merge branch 'sg/split-index-test' into maint
[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(&the_index, 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 static int module_sync(int argc, const char **argv, const char *prefix)
1030 {
1031         struct sync_cb info = SYNC_CB_INIT;
1032         struct pathspec pathspec;
1033         struct module_list list = MODULE_LIST_INIT;
1034         int quiet = 0;
1035         int recursive = 0;
1036
1037         struct option module_sync_options[] = {
1038                 OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
1039                 OPT_BOOL(0, "recursive", &recursive,
1040                         N_("Recurse into nested submodules")),
1041                 OPT_END()
1042         };
1043
1044         const char *const git_submodule_helper_usage[] = {
1045                 N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
1046                 NULL
1047         };
1048
1049         argc = parse_options(argc, argv, prefix, module_sync_options,
1050                              git_submodule_helper_usage, 0);
1051
1052         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1053                 return 1;
1054
1055         info.prefix = prefix;
1056         if (quiet)
1057                 info.flags |= OPT_QUIET;
1058         if (recursive)
1059                 info.flags |= OPT_RECURSIVE;
1060
1061         for_each_listed_submodule(&list, sync_submodule_cb, &info);
1062
1063         return 0;
1064 }
1065
1066 struct deinit_cb {
1067         const char *prefix;
1068         unsigned int flags;
1069 };
1070 #define DEINIT_CB_INIT { NULL, 0 }
1071
1072 static void deinit_submodule(const char *path, const char *prefix,
1073                              unsigned int flags)
1074 {
1075         const struct submodule *sub;
1076         char *displaypath = NULL;
1077         struct child_process cp_config = CHILD_PROCESS_INIT;
1078         struct strbuf sb_config = STRBUF_INIT;
1079         char *sub_git_dir = xstrfmt("%s/.git", path);
1080
1081         sub = submodule_from_path(the_repository, &null_oid, path);
1082
1083         if (!sub || !sub->name)
1084                 goto cleanup;
1085
1086         displaypath = get_submodule_displaypath(path, prefix);
1087
1088         /* remove the submodule work tree (unless the user already did it) */
1089         if (is_directory(path)) {
1090                 struct strbuf sb_rm = STRBUF_INIT;
1091                 const char *format;
1092
1093                 /*
1094                  * protect submodules containing a .git directory
1095                  * NEEDSWORK: instead of dying, automatically call
1096                  * absorbgitdirs and (possibly) warn.
1097                  */
1098                 if (is_directory(sub_git_dir))
1099                         die(_("Submodule work tree '%s' contains a .git "
1100                               "directory (use 'rm -rf' if you really want "
1101                               "to remove it including all of its history)"),
1102                             displaypath);
1103
1104                 if (!(flags & OPT_FORCE)) {
1105                         struct child_process cp_rm = CHILD_PROCESS_INIT;
1106                         cp_rm.git_cmd = 1;
1107                         argv_array_pushl(&cp_rm.args, "rm", "-qn",
1108                                          path, NULL);
1109
1110                         if (run_command(&cp_rm))
1111                                 die(_("Submodule work tree '%s' contains local "
1112                                       "modifications; use '-f' to discard them"),
1113                                       displaypath);
1114                 }
1115
1116                 strbuf_addstr(&sb_rm, path);
1117
1118                 if (!remove_dir_recursively(&sb_rm, 0))
1119                         format = _("Cleared directory '%s'\n");
1120                 else
1121                         format = _("Could not remove submodule work tree '%s'\n");
1122
1123                 if (!(flags & OPT_QUIET))
1124                         printf(format, displaypath);
1125
1126                 strbuf_release(&sb_rm);
1127         }
1128
1129         if (mkdir(path, 0777))
1130                 printf(_("could not create empty submodule directory %s"),
1131                       displaypath);
1132
1133         cp_config.git_cmd = 1;
1134         argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
1135         argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
1136
1137         /* remove the .git/config entries (unless the user already did it) */
1138         if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
1139                 char *sub_key = xstrfmt("submodule.%s", sub->name);
1140                 /*
1141                  * remove the whole section so we have a clean state when
1142                  * the user later decides to init this submodule again
1143                  */
1144                 git_config_rename_section_in_file(NULL, sub_key, NULL);
1145                 if (!(flags & OPT_QUIET))
1146                         printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
1147                                  sub->name, sub->url, displaypath);
1148                 free(sub_key);
1149         }
1150
1151 cleanup:
1152         free(displaypath);
1153         free(sub_git_dir);
1154         strbuf_release(&sb_config);
1155 }
1156
1157 static void deinit_submodule_cb(const struct cache_entry *list_item,
1158                                 void *cb_data)
1159 {
1160         struct deinit_cb *info = cb_data;
1161         deinit_submodule(list_item->name, info->prefix, info->flags);
1162 }
1163
1164 static int module_deinit(int argc, const char **argv, const char *prefix)
1165 {
1166         struct deinit_cb info = DEINIT_CB_INIT;
1167         struct pathspec pathspec;
1168         struct module_list list = MODULE_LIST_INIT;
1169         int quiet = 0;
1170         int force = 0;
1171         int all = 0;
1172
1173         struct option module_deinit_options[] = {
1174                 OPT__QUIET(&quiet, N_("Suppress submodule status output")),
1175                 OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes"), 0),
1176                 OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
1177                 OPT_END()
1178         };
1179
1180         const char *const git_submodule_helper_usage[] = {
1181                 N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
1182                 NULL
1183         };
1184
1185         argc = parse_options(argc, argv, prefix, module_deinit_options,
1186                              git_submodule_helper_usage, 0);
1187
1188         if (all && argc) {
1189                 error("pathspec and --all are incompatible");
1190                 usage_with_options(git_submodule_helper_usage,
1191                                    module_deinit_options);
1192         }
1193
1194         if (!argc && !all)
1195                 die(_("Use '--all' if you really want to deinitialize all submodules"));
1196
1197         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1198                 return 1;
1199
1200         info.prefix = prefix;
1201         if (quiet)
1202                 info.flags |= OPT_QUIET;
1203         if (force)
1204                 info.flags |= OPT_FORCE;
1205
1206         for_each_listed_submodule(&list, deinit_submodule_cb, &info);
1207
1208         return 0;
1209 }
1210
1211 static int clone_submodule(const char *path, const char *gitdir, const char *url,
1212                            const char *depth, struct string_list *reference, int dissociate,
1213                            int quiet, int progress)
1214 {
1215         struct child_process cp = CHILD_PROCESS_INIT;
1216
1217         argv_array_push(&cp.args, "clone");
1218         argv_array_push(&cp.args, "--no-checkout");
1219         if (quiet)
1220                 argv_array_push(&cp.args, "--quiet");
1221         if (progress)
1222                 argv_array_push(&cp.args, "--progress");
1223         if (depth && *depth)
1224                 argv_array_pushl(&cp.args, "--depth", depth, NULL);
1225         if (reference->nr) {
1226                 struct string_list_item *item;
1227                 for_each_string_list_item(item, reference)
1228                         argv_array_pushl(&cp.args, "--reference",
1229                                          item->string, NULL);
1230         }
1231         if (dissociate)
1232                 argv_array_push(&cp.args, "--dissociate");
1233         if (gitdir && *gitdir)
1234                 argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
1235
1236         argv_array_push(&cp.args, "--");
1237         argv_array_push(&cp.args, url);
1238         argv_array_push(&cp.args, path);
1239
1240         cp.git_cmd = 1;
1241         prepare_submodule_repo_env(&cp.env_array);
1242         cp.no_stdin = 1;
1243
1244         return run_command(&cp);
1245 }
1246
1247 struct submodule_alternate_setup {
1248         const char *submodule_name;
1249         enum SUBMODULE_ALTERNATE_ERROR_MODE {
1250                 SUBMODULE_ALTERNATE_ERROR_DIE,
1251                 SUBMODULE_ALTERNATE_ERROR_INFO,
1252                 SUBMODULE_ALTERNATE_ERROR_IGNORE
1253         } error_mode;
1254         struct string_list *reference;
1255 };
1256 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
1257         SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
1258
1259 static int add_possible_reference_from_superproject(
1260                 struct alternate_object_database *alt, void *sas_cb)
1261 {
1262         struct submodule_alternate_setup *sas = sas_cb;
1263
1264         /*
1265          * If the alternate object store is another repository, try the
1266          * standard layout with .git/(modules/<name>)+/objects
1267          */
1268         if (ends_with(alt->path, "/objects")) {
1269                 char *sm_alternate;
1270                 struct strbuf sb = STRBUF_INIT;
1271                 struct strbuf err = STRBUF_INIT;
1272                 strbuf_add(&sb, alt->path, strlen(alt->path) - strlen("objects"));
1273
1274                 /*
1275                  * We need to end the new path with '/' to mark it as a dir,
1276                  * otherwise a submodule name containing '/' will be broken
1277                  * as the last part of a missing submodule reference would
1278                  * be taken as a file name.
1279                  */
1280                 strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
1281
1282                 sm_alternate = compute_alternate_path(sb.buf, &err);
1283                 if (sm_alternate) {
1284                         string_list_append(sas->reference, xstrdup(sb.buf));
1285                         free(sm_alternate);
1286                 } else {
1287                         switch (sas->error_mode) {
1288                         case SUBMODULE_ALTERNATE_ERROR_DIE:
1289                                 die(_("submodule '%s' cannot add alternate: %s"),
1290                                     sas->submodule_name, err.buf);
1291                         case SUBMODULE_ALTERNATE_ERROR_INFO:
1292                                 fprintf(stderr, _("submodule '%s' cannot add alternate: %s"),
1293                                         sas->submodule_name, err.buf);
1294                         case SUBMODULE_ALTERNATE_ERROR_IGNORE:
1295                                 ; /* nothing */
1296                         }
1297                 }
1298                 strbuf_release(&sb);
1299         }
1300
1301         return 0;
1302 }
1303
1304 static void prepare_possible_alternates(const char *sm_name,
1305                 struct string_list *reference)
1306 {
1307         char *sm_alternate = NULL, *error_strategy = NULL;
1308         struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;
1309
1310         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1311         if (!sm_alternate)
1312                 return;
1313
1314         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1315
1316         if (!error_strategy)
1317                 error_strategy = xstrdup("die");
1318
1319         sas.submodule_name = sm_name;
1320         sas.reference = reference;
1321         if (!strcmp(error_strategy, "die"))
1322                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
1323         else if (!strcmp(error_strategy, "info"))
1324                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
1325         else if (!strcmp(error_strategy, "ignore"))
1326                 sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
1327         else
1328                 die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);
1329
1330         if (!strcmp(sm_alternate, "superproject"))
1331                 foreach_alt_odb(add_possible_reference_from_superproject, &sas);
1332         else if (!strcmp(sm_alternate, "no"))
1333                 ; /* do nothing */
1334         else
1335                 die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);
1336
1337         free(sm_alternate);
1338         free(error_strategy);
1339 }
1340
1341 static int module_clone(int argc, const char **argv, const char *prefix)
1342 {
1343         const char *name = NULL, *url = NULL, *depth = NULL;
1344         int quiet = 0;
1345         int progress = 0;
1346         char *p, *path = NULL, *sm_gitdir;
1347         struct strbuf sb = STRBUF_INIT;
1348         struct string_list reference = STRING_LIST_INIT_NODUP;
1349         int dissociate = 0;
1350         char *sm_alternate = NULL, *error_strategy = NULL;
1351
1352         struct option module_clone_options[] = {
1353                 OPT_STRING(0, "prefix", &prefix,
1354                            N_("path"),
1355                            N_("alternative anchor for relative paths")),
1356                 OPT_STRING(0, "path", &path,
1357                            N_("path"),
1358                            N_("where the new submodule will be cloned to")),
1359                 OPT_STRING(0, "name", &name,
1360                            N_("string"),
1361                            N_("name of the new submodule")),
1362                 OPT_STRING(0, "url", &url,
1363                            N_("string"),
1364                            N_("url where to clone the submodule from")),
1365                 OPT_STRING_LIST(0, "reference", &reference,
1366                            N_("repo"),
1367                            N_("reference repository")),
1368                 OPT_BOOL(0, "dissociate", &dissociate,
1369                            N_("use --reference only while cloning")),
1370                 OPT_STRING(0, "depth", &depth,
1371                            N_("string"),
1372                            N_("depth for shallow clones")),
1373                 OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
1374                 OPT_BOOL(0, "progress", &progress,
1375                            N_("force cloning progress")),
1376                 OPT_END()
1377         };
1378
1379         const char *const git_submodule_helper_usage[] = {
1380                 N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
1381                    "[--reference <repository>] [--name <name>] [--depth <depth>] "
1382                    "--url <url> --path <path>"),
1383                 NULL
1384         };
1385
1386         argc = parse_options(argc, argv, prefix, module_clone_options,
1387                              git_submodule_helper_usage, 0);
1388
1389         if (argc || !url || !path || !*path)
1390                 usage_with_options(git_submodule_helper_usage,
1391                                    module_clone_options);
1392
1393         strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
1394         sm_gitdir = absolute_pathdup(sb.buf);
1395         strbuf_reset(&sb);
1396
1397         if (!is_absolute_path(path)) {
1398                 strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
1399                 path = strbuf_detach(&sb, NULL);
1400         } else
1401                 path = xstrdup(path);
1402
1403         if (!file_exists(sm_gitdir)) {
1404                 if (safe_create_leading_directories_const(sm_gitdir) < 0)
1405                         die(_("could not create directory '%s'"), sm_gitdir);
1406
1407                 prepare_possible_alternates(name, &reference);
1408
1409                 if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
1410                                     quiet, progress))
1411                         die(_("clone of '%s' into submodule path '%s' failed"),
1412                             url, path);
1413         } else {
1414                 if (safe_create_leading_directories_const(path) < 0)
1415                         die(_("could not create directory '%s'"), path);
1416                 strbuf_addf(&sb, "%s/index", sm_gitdir);
1417                 unlink_or_warn(sb.buf);
1418                 strbuf_reset(&sb);
1419         }
1420
1421         connect_work_tree_and_git_dir(path, sm_gitdir, 0);
1422
1423         p = git_pathdup_submodule(path, "config");
1424         if (!p)
1425                 die(_("could not get submodule directory for '%s'"), path);
1426
1427         /* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
1428         git_config_get_string("submodule.alternateLocation", &sm_alternate);
1429         if (sm_alternate)
1430                 git_config_set_in_file(p, "submodule.alternateLocation",
1431                                            sm_alternate);
1432         git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
1433         if (error_strategy)
1434                 git_config_set_in_file(p, "submodule.alternateErrorStrategy",
1435                                            error_strategy);
1436
1437         free(sm_alternate);
1438         free(error_strategy);
1439
1440         strbuf_release(&sb);
1441         free(sm_gitdir);
1442         free(path);
1443         free(p);
1444         return 0;
1445 }
1446
1447 struct submodule_update_clone {
1448         /* index into 'list', the list of submodules to look into for cloning */
1449         int current;
1450         struct module_list list;
1451         unsigned warn_if_uninitialized : 1;
1452
1453         /* update parameter passed via commandline */
1454         struct submodule_update_strategy update;
1455
1456         /* configuration parameters which are passed on to the children */
1457         int progress;
1458         int quiet;
1459         int recommend_shallow;
1460         struct string_list references;
1461         int dissociate;
1462         const char *depth;
1463         const char *recursive_prefix;
1464         const char *prefix;
1465
1466         /* Machine-readable status lines to be consumed by git-submodule.sh */
1467         struct string_list projectlines;
1468
1469         /* If we want to stop as fast as possible and return an error */
1470         unsigned quickstop : 1;
1471
1472         /* failed clones to be retried again */
1473         const struct cache_entry **failed_clones;
1474         int failed_clones_nr, failed_clones_alloc;
1475 };
1476 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
1477         SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
1478         NULL, NULL, NULL, \
1479         STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
1480
1481
1482 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
1483                 struct strbuf *out, const char *displaypath)
1484 {
1485         /*
1486          * Only mention uninitialized submodules when their
1487          * paths have been specified.
1488          */
1489         if (suc->warn_if_uninitialized) {
1490                 strbuf_addf(out,
1491                         _("Submodule path '%s' not initialized"),
1492                         displaypath);
1493                 strbuf_addch(out, '\n');
1494                 strbuf_addstr(out,
1495                         _("Maybe you want to use 'update --init'?"));
1496                 strbuf_addch(out, '\n');
1497         }
1498 }
1499
1500 /**
1501  * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
1502  * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
1503  */
1504 static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
1505                                            struct child_process *child,
1506                                            struct submodule_update_clone *suc,
1507                                            struct strbuf *out)
1508 {
1509         const struct submodule *sub = NULL;
1510         const char *url = NULL;
1511         const char *update_string;
1512         enum submodule_update_type update_type;
1513         char *key;
1514         struct strbuf displaypath_sb = STRBUF_INIT;
1515         struct strbuf sb = STRBUF_INIT;
1516         const char *displaypath = NULL;
1517         int needs_cloning = 0;
1518
1519         if (ce_stage(ce)) {
1520                 if (suc->recursive_prefix)
1521                         strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
1522                 else
1523                         strbuf_addstr(&sb, ce->name);
1524                 strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
1525                 strbuf_addch(out, '\n');
1526                 goto cleanup;
1527         }
1528
1529         sub = submodule_from_path(the_repository, &null_oid, ce->name);
1530
1531         if (suc->recursive_prefix)
1532                 displaypath = relative_path(suc->recursive_prefix,
1533                                             ce->name, &displaypath_sb);
1534         else
1535                 displaypath = ce->name;
1536
1537         if (!sub) {
1538                 next_submodule_warn_missing(suc, out, displaypath);
1539                 goto cleanup;
1540         }
1541
1542         key = xstrfmt("submodule.%s.update", sub->name);
1543         if (!repo_config_get_string_const(the_repository, key, &update_string)) {
1544                 update_type = parse_submodule_update_type(update_string);
1545         } else {
1546                 update_type = sub->update_strategy.type;
1547         }
1548         free(key);
1549
1550         if (suc->update.type == SM_UPDATE_NONE
1551             || (suc->update.type == SM_UPDATE_UNSPECIFIED
1552                 && update_type == SM_UPDATE_NONE)) {
1553                 strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
1554                 strbuf_addch(out, '\n');
1555                 goto cleanup;
1556         }
1557
1558         /* Check if the submodule has been initialized. */
1559         if (!is_submodule_active(the_repository, ce->name)) {
1560                 next_submodule_warn_missing(suc, out, displaypath);
1561                 goto cleanup;
1562         }
1563
1564         strbuf_reset(&sb);
1565         strbuf_addf(&sb, "submodule.%s.url", sub->name);
1566         if (repo_config_get_string_const(the_repository, sb.buf, &url))
1567                 url = sub->url;
1568
1569         strbuf_reset(&sb);
1570         strbuf_addf(&sb, "%s/.git", ce->name);
1571         needs_cloning = !file_exists(sb.buf);
1572
1573         strbuf_reset(&sb);
1574         strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
1575                         oid_to_hex(&ce->oid), ce_stage(ce),
1576                         needs_cloning, ce->name);
1577         string_list_append(&suc->projectlines, sb.buf);
1578
1579         if (!needs_cloning)
1580                 goto cleanup;
1581
1582         child->git_cmd = 1;
1583         child->no_stdin = 1;
1584         child->stdout_to_stderr = 1;
1585         child->err = -1;
1586         argv_array_push(&child->args, "submodule--helper");
1587         argv_array_push(&child->args, "clone");
1588         if (suc->progress)
1589                 argv_array_push(&child->args, "--progress");
1590         if (suc->quiet)
1591                 argv_array_push(&child->args, "--quiet");
1592         if (suc->prefix)
1593                 argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
1594         if (suc->recommend_shallow && sub->recommend_shallow == 1)
1595                 argv_array_push(&child->args, "--depth=1");
1596         argv_array_pushl(&child->args, "--path", sub->path, NULL);
1597         argv_array_pushl(&child->args, "--name", sub->name, NULL);
1598         argv_array_pushl(&child->args, "--url", url, NULL);
1599         if (suc->references.nr) {
1600                 struct string_list_item *item;
1601                 for_each_string_list_item(item, &suc->references)
1602                         argv_array_pushl(&child->args, "--reference", item->string, NULL);
1603         }
1604         if (suc->dissociate)
1605                 argv_array_push(&child->args, "--dissociate");
1606         if (suc->depth)
1607                 argv_array_push(&child->args, suc->depth);
1608
1609 cleanup:
1610         strbuf_reset(&displaypath_sb);
1611         strbuf_reset(&sb);
1612
1613         return needs_cloning;
1614 }
1615
1616 static int update_clone_get_next_task(struct child_process *child,
1617                                       struct strbuf *err,
1618                                       void *suc_cb,
1619                                       void **idx_task_cb)
1620 {
1621         struct submodule_update_clone *suc = suc_cb;
1622         const struct cache_entry *ce;
1623         int index;
1624
1625         for (; suc->current < suc->list.nr; suc->current++) {
1626                 ce = suc->list.entries[suc->current];
1627                 if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
1628                         int *p = xmalloc(sizeof(*p));
1629                         *p = suc->current;
1630                         *idx_task_cb = p;
1631                         suc->current++;
1632                         return 1;
1633                 }
1634         }
1635
1636         /*
1637          * The loop above tried cloning each submodule once, now try the
1638          * stragglers again, which we can imagine as an extension of the
1639          * entry list.
1640          */
1641         index = suc->current - suc->list.nr;
1642         if (index < suc->failed_clones_nr) {
1643                 int *p;
1644                 ce = suc->failed_clones[index];
1645                 if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
1646                         suc->current ++;
1647                         strbuf_addstr(err, "BUG: submodule considered for "
1648                                            "cloning, doesn't need cloning "
1649                                            "any more?\n");
1650                         return 0;
1651                 }
1652                 p = xmalloc(sizeof(*p));
1653                 *p = suc->current;
1654                 *idx_task_cb = p;
1655                 suc->current ++;
1656                 return 1;
1657         }
1658
1659         return 0;
1660 }
1661
1662 static int update_clone_start_failure(struct strbuf *err,
1663                                       void *suc_cb,
1664                                       void *idx_task_cb)
1665 {
1666         struct submodule_update_clone *suc = suc_cb;
1667         suc->quickstop = 1;
1668         return 1;
1669 }
1670
1671 static int update_clone_task_finished(int result,
1672                                       struct strbuf *err,
1673                                       void *suc_cb,
1674                                       void *idx_task_cb)
1675 {
1676         const struct cache_entry *ce;
1677         struct submodule_update_clone *suc = suc_cb;
1678
1679         int *idxP = idx_task_cb;
1680         int idx = *idxP;
1681         free(idxP);
1682
1683         if (!result)
1684                 return 0;
1685
1686         if (idx < suc->list.nr) {
1687                 ce  = suc->list.entries[idx];
1688                 strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
1689                             ce->name);
1690                 strbuf_addch(err, '\n');
1691                 ALLOC_GROW(suc->failed_clones,
1692                            suc->failed_clones_nr + 1,
1693                            suc->failed_clones_alloc);
1694                 suc->failed_clones[suc->failed_clones_nr++] = ce;
1695                 return 0;
1696         } else {
1697                 idx -= suc->list.nr;
1698                 ce  = suc->failed_clones[idx];
1699                 strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
1700                             ce->name);
1701                 strbuf_addch(err, '\n');
1702                 suc->quickstop = 1;
1703                 return 1;
1704         }
1705
1706         return 0;
1707 }
1708
1709 static int git_update_clone_config(const char *var, const char *value,
1710                                    void *cb)
1711 {
1712         int *max_jobs = cb;
1713         if (!strcmp(var, "submodule.fetchjobs"))
1714                 *max_jobs = parse_submodule_fetchjobs(var, value);
1715         return 0;
1716 }
1717
1718 static int update_clone(int argc, const char **argv, const char *prefix)
1719 {
1720         const char *update = NULL;
1721         int max_jobs = 1;
1722         struct string_list_item *item;
1723         struct pathspec pathspec;
1724         struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
1725
1726         struct option module_update_clone_options[] = {
1727                 OPT_STRING(0, "prefix", &prefix,
1728                            N_("path"),
1729                            N_("path into the working tree")),
1730                 OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
1731                            N_("path"),
1732                            N_("path into the working tree, across nested "
1733                               "submodule boundaries")),
1734                 OPT_STRING(0, "update", &update,
1735                            N_("string"),
1736                            N_("rebase, merge, checkout or none")),
1737                 OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
1738                            N_("reference repository")),
1739                 OPT_BOOL(0, "dissociate", &suc.dissociate,
1740                            N_("use --reference only while cloning")),
1741                 OPT_STRING(0, "depth", &suc.depth, "<depth>",
1742                            N_("Create a shallow clone truncated to the "
1743                               "specified number of revisions")),
1744                 OPT_INTEGER('j', "jobs", &max_jobs,
1745                             N_("parallel jobs")),
1746                 OPT_BOOL(0, "recommend-shallow", &suc.recommend_shallow,
1747                             N_("whether the initial clone should follow the shallow recommendation")),
1748                 OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
1749                 OPT_BOOL(0, "progress", &suc.progress,
1750                             N_("force cloning progress")),
1751                 OPT_END()
1752         };
1753
1754         const char *const git_submodule_helper_usage[] = {
1755                 N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
1756                 NULL
1757         };
1758         suc.prefix = prefix;
1759
1760         update_clone_config_from_gitmodules(&max_jobs);
1761         git_config(git_update_clone_config, &max_jobs);
1762
1763         argc = parse_options(argc, argv, prefix, module_update_clone_options,
1764                              git_submodule_helper_usage, 0);
1765
1766         if (update)
1767                 if (parse_submodule_update_strategy(update, &suc.update) < 0)
1768                         die(_("bad value for update parameter"));
1769
1770         if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
1771                 return 1;
1772
1773         if (pathspec.nr)
1774                 suc.warn_if_uninitialized = 1;
1775
1776         run_processes_parallel(max_jobs,
1777                                update_clone_get_next_task,
1778                                update_clone_start_failure,
1779                                update_clone_task_finished,
1780                                &suc);
1781
1782         /*
1783          * We saved the output and put it out all at once now.
1784          * That means:
1785          * - the listener does not have to interleave their (checkout)
1786          *   work with our fetching.  The writes involved in a
1787          *   checkout involve more straightforward sequential I/O.
1788          * - the listener can avoid doing any work if fetching failed.
1789          */
1790         if (suc.quickstop)
1791                 return 1;
1792
1793         for_each_string_list_item(item, &suc.projectlines)
1794                 fprintf(stdout, "%s", item->string);
1795
1796         return 0;
1797 }
1798
1799 static int resolve_relative_path(int argc, const char **argv, const char *prefix)
1800 {
1801         struct strbuf sb = STRBUF_INIT;
1802         if (argc != 3)
1803                 die("submodule--helper relative-path takes exactly 2 arguments, got %d", argc);
1804
1805         printf("%s", relative_path(argv[1], argv[2], &sb));
1806         strbuf_release(&sb);
1807         return 0;
1808 }
1809
1810 static const char *remote_submodule_branch(const char *path)
1811 {
1812         const struct submodule *sub;
1813         const char *branch = NULL;
1814         char *key;
1815
1816         sub = submodule_from_path(the_repository, &null_oid, path);
1817         if (!sub)
1818                 return NULL;
1819
1820         key = xstrfmt("submodule.%s.branch", sub->name);
1821         if (repo_config_get_string_const(the_repository, key, &branch))
1822                 branch = sub->branch;
1823         free(key);
1824
1825         if (!branch)
1826                 return "master";
1827
1828         if (!strcmp(branch, ".")) {
1829                 const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
1830
1831                 if (!refname)
1832                         die(_("No such ref: %s"), "HEAD");
1833
1834                 /* detached HEAD */
1835                 if (!strcmp(refname, "HEAD"))
1836                         die(_("Submodule (%s) branch configured to inherit "
1837                               "branch from superproject, but the superproject "
1838                               "is not on any branch"), sub->name);
1839
1840                 if (!skip_prefix(refname, "refs/heads/", &refname))
1841                         die(_("Expecting a full ref name, got %s"), refname);
1842                 return refname;
1843         }
1844
1845         return branch;
1846 }
1847
1848 static int resolve_remote_submodule_branch(int argc, const char **argv,
1849                 const char *prefix)
1850 {
1851         const char *ret;
1852         struct strbuf sb = STRBUF_INIT;
1853         if (argc != 2)
1854                 die("submodule--helper remote-branch takes exactly one arguments, got %d", argc);
1855
1856         ret = remote_submodule_branch(argv[1]);
1857         if (!ret)
1858                 die("submodule %s doesn't exist", argv[1]);
1859
1860         printf("%s", ret);
1861         strbuf_release(&sb);
1862         return 0;
1863 }
1864
1865 static int push_check(int argc, const char **argv, const char *prefix)
1866 {
1867         struct remote *remote;
1868         const char *superproject_head;
1869         char *head;
1870         int detached_head = 0;
1871         struct object_id head_oid;
1872
1873         if (argc < 3)
1874                 die("submodule--helper push-check requires at least 2 arguments");
1875
1876         /*
1877          * superproject's resolved head ref.
1878          * if HEAD then the superproject is in a detached head state, otherwise
1879          * it will be the resolved head ref.
1880          */
1881         superproject_head = argv[1];
1882         argv++;
1883         argc--;
1884         /* Get the submodule's head ref and determine if it is detached */
1885         head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1886         if (!head)
1887                 die(_("Failed to resolve HEAD as a valid ref."));
1888         if (!strcmp(head, "HEAD"))
1889                 detached_head = 1;
1890
1891         /*
1892          * The remote must be configured.
1893          * This is to avoid pushing to the exact same URL as the parent.
1894          */
1895         remote = pushremote_get(argv[1]);
1896         if (!remote || remote->origin == REMOTE_UNCONFIGURED)
1897                 die("remote '%s' not configured", argv[1]);
1898
1899         /* Check the refspec */
1900         if (argc > 2) {
1901                 int i;
1902                 struct ref *local_refs = get_local_heads();
1903                 struct refspec refspec = REFSPEC_INIT_PUSH;
1904
1905                 refspec_appendn(&refspec, argv + 2, argc - 2);
1906
1907                 for (i = 0; i < refspec.nr; i++) {
1908                         const struct refspec_item *rs = &refspec.items[i];
1909
1910                         if (rs->pattern || rs->matching)
1911                                 continue;
1912
1913                         /* LHS must match a single ref */
1914                         switch (count_refspec_match(rs->src, local_refs, NULL)) {
1915                         case 1:
1916                                 break;
1917                         case 0:
1918                                 /*
1919                                  * If LHS matches 'HEAD' then we need to ensure
1920                                  * that it matches the same named branch
1921                                  * checked out in the superproject.
1922                                  */
1923                                 if (!strcmp(rs->src, "HEAD")) {
1924                                         if (!detached_head &&
1925                                             !strcmp(head, superproject_head))
1926                                                 break;
1927                                         die("HEAD does not match the named branch in the superproject");
1928                                 }
1929                                 /* fallthrough */
1930                         default:
1931                                 die("src refspec '%s' must name a ref",
1932                                     rs->src);
1933                         }
1934                 }
1935                 refspec_clear(&refspec);
1936         }
1937         free(head);
1938
1939         return 0;
1940 }
1941
1942 static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
1943 {
1944         int i;
1945         struct pathspec pathspec;
1946         struct module_list list = MODULE_LIST_INIT;
1947         unsigned flags = ABSORB_GITDIR_RECURSE_SUBMODULES;
1948
1949         struct option embed_gitdir_options[] = {
1950                 OPT_STRING(0, "prefix", &prefix,
1951                            N_("path"),
1952                            N_("path into the working tree")),
1953                 OPT_BIT(0, "--recursive", &flags, N_("recurse into submodules"),
1954                         ABSORB_GITDIR_RECURSE_SUBMODULES),
1955                 OPT_END()
1956         };
1957
1958         const char *const git_submodule_helper_usage[] = {
1959                 N_("git submodule--helper embed-git-dir [<path>...]"),
1960                 NULL
1961         };
1962
1963         argc = parse_options(argc, argv, prefix, embed_gitdir_options,
1964                              git_submodule_helper_usage, 0);
1965
1966         if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
1967                 return 1;
1968
1969         for (i = 0; i < list.nr; i++)
1970                 absorb_git_dir_into_superproject(prefix,
1971                                 list.entries[i]->name, flags);
1972
1973         return 0;
1974 }
1975
1976 static int is_active(int argc, const char **argv, const char *prefix)
1977 {
1978         if (argc != 2)
1979                 die("submodule--helper is-active takes exactly 1 argument");
1980
1981         return !is_submodule_active(the_repository, argv[1]);
1982 }
1983
1984 /*
1985  * Exit non-zero if any of the submodule names given on the command line is
1986  * invalid. If no names are given, filter stdin to print only valid names
1987  * (which is primarily intended for testing).
1988  */
1989 static int check_name(int argc, const char **argv, const char *prefix)
1990 {
1991         if (argc > 1) {
1992                 while (*++argv) {
1993                         if (check_submodule_name(*argv) < 0)
1994                                 return 1;
1995                 }
1996         } else {
1997                 struct strbuf buf = STRBUF_INIT;
1998                 while (strbuf_getline(&buf, stdin) != EOF) {
1999                         if (!check_submodule_name(buf.buf))
2000                                 printf("%s\n", buf.buf);
2001                 }
2002                 strbuf_release(&buf);
2003         }
2004         return 0;
2005 }
2006
2007 #define SUPPORT_SUPER_PREFIX (1<<0)
2008
2009 struct cmd_struct {
2010         const char *cmd;
2011         int (*fn)(int, const char **, const char *);
2012         unsigned option;
2013 };
2014
2015 static struct cmd_struct commands[] = {
2016         {"list", module_list, 0},
2017         {"name", module_name, 0},
2018         {"clone", module_clone, 0},
2019         {"update-clone", update_clone, 0},
2020         {"relative-path", resolve_relative_path, 0},
2021         {"resolve-relative-url", resolve_relative_url, 0},
2022         {"resolve-relative-url-test", resolve_relative_url_test, 0},
2023         {"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
2024         {"init", module_init, SUPPORT_SUPER_PREFIX},
2025         {"status", module_status, SUPPORT_SUPER_PREFIX},
2026         {"print-default-remote", print_default_remote, 0},
2027         {"sync", module_sync, SUPPORT_SUPER_PREFIX},
2028         {"deinit", module_deinit, 0},
2029         {"remote-branch", resolve_remote_submodule_branch, 0},
2030         {"push-check", push_check, 0},
2031         {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
2032         {"is-active", is_active, 0},
2033         {"check-name", check_name, 0},
2034 };
2035
2036 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
2037 {
2038         int i;
2039         if (argc < 2 || !strcmp(argv[1], "-h"))
2040                 usage("git submodule--helper <command>");
2041
2042         for (i = 0; i < ARRAY_SIZE(commands); i++) {
2043                 if (!strcmp(argv[1], commands[i].cmd)) {
2044                         if (get_super_prefix() &&
2045                             !(commands[i].option & SUPPORT_SUPER_PREFIX))
2046                                 die(_("%s doesn't support --super-prefix"),
2047                                     commands[i].cmd);
2048                         return commands[i].fn(argc - 1, argv + 1, prefix);
2049                 }
2050         }
2051
2052         die(_("'%s' is not a valid submodule--helper "
2053               "subcommand"), argv[1]);
2054 }