Imported Upstream version 2.5.0
[platform/upstream/git.git] / submodule.c
1 #include "cache.h"
2 #include "submodule.h"
3 #include "dir.h"
4 #include "diff.h"
5 #include "commit.h"
6 #include "revision.h"
7 #include "run-command.h"
8 #include "diffcore.h"
9 #include "refs.h"
10 #include "string-list.h"
11 #include "sha1-array.h"
12 #include "argv-array.h"
13 #include "blob.h"
14
15 static struct string_list config_name_for_path;
16 static struct string_list config_fetch_recurse_submodules_for_name;
17 static struct string_list config_ignore_for_name;
18 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
19 static struct string_list changed_submodule_paths;
20 static int initialized_fetch_ref_tips;
21 static struct sha1_array ref_tips_before_fetch;
22 static struct sha1_array ref_tips_after_fetch;
23
24 /*
25  * The following flag is set if the .gitmodules file is unmerged. We then
26  * disable recursion for all submodules where .git/config doesn't have a
27  * matching config entry because we can't guess what might be configured in
28  * .gitmodules unless the user resolves the conflict. When a command line
29  * option is given (which always overrides configuration) this flag will be
30  * ignored.
31  */
32 static int gitmodules_is_unmerged;
33
34 /*
35  * This flag is set if the .gitmodules file had unstaged modifications on
36  * startup. This must be checked before allowing modifications to the
37  * .gitmodules file with the intention to stage them later, because when
38  * continuing we would stage the modifications the user didn't stage herself
39  * too. That might change in a future version when we learn to stage the
40  * changes we do ourselves without staging any previous modifications.
41  */
42 static int gitmodules_is_modified;
43
44
45 int is_staging_gitmodules_ok(void)
46 {
47         return !gitmodules_is_modified;
48 }
49
50 /*
51  * Try to update the "path" entry in the "submodule.<name>" section of the
52  * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
53  * with the correct path=<oldpath> setting was found and we could update it.
54  */
55 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
56 {
57         struct strbuf entry = STRBUF_INIT;
58         struct string_list_item *path_option;
59
60         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
61                 return -1;
62
63         if (gitmodules_is_unmerged)
64                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
65
66         path_option = unsorted_string_list_lookup(&config_name_for_path, oldpath);
67         if (!path_option) {
68                 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
69                 return -1;
70         }
71         strbuf_addstr(&entry, "submodule.");
72         strbuf_addstr(&entry, path_option->util);
73         strbuf_addstr(&entry, ".path");
74         if (git_config_set_in_file(".gitmodules", entry.buf, newpath) < 0) {
75                 /* Maybe the user already did that, don't error out here */
76                 warning(_("Could not update .gitmodules entry %s"), entry.buf);
77                 strbuf_release(&entry);
78                 return -1;
79         }
80         strbuf_release(&entry);
81         return 0;
82 }
83
84 /*
85  * Try to remove the "submodule.<name>" section from .gitmodules where the given
86  * path is configured. Return 0 only if a .gitmodules file was found, a section
87  * with the correct path=<path> setting was found and we could remove it.
88  */
89 int remove_path_from_gitmodules(const char *path)
90 {
91         struct strbuf sect = STRBUF_INIT;
92         struct string_list_item *path_option;
93
94         if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
95                 return -1;
96
97         if (gitmodules_is_unmerged)
98                 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
99
100         path_option = unsorted_string_list_lookup(&config_name_for_path, path);
101         if (!path_option) {
102                 warning(_("Could not find section in .gitmodules where path=%s"), path);
103                 return -1;
104         }
105         strbuf_addstr(&sect, "submodule.");
106         strbuf_addstr(&sect, path_option->util);
107         if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
108                 /* Maybe the user already did that, don't error out here */
109                 warning(_("Could not remove .gitmodules entry for %s"), path);
110                 strbuf_release(&sect);
111                 return -1;
112         }
113         strbuf_release(&sect);
114         return 0;
115 }
116
117 void stage_updated_gitmodules(void)
118 {
119         if (add_file_to_cache(".gitmodules", 0))
120                 die(_("staging updated .gitmodules failed"));
121 }
122
123 static int add_submodule_odb(const char *path)
124 {
125         struct strbuf objects_directory = STRBUF_INIT;
126         struct alternate_object_database *alt_odb;
127         int ret = 0;
128         const char *git_dir;
129
130         strbuf_addf(&objects_directory, "%s/.git", path);
131         git_dir = read_gitfile(objects_directory.buf);
132         if (git_dir) {
133                 strbuf_reset(&objects_directory);
134                 strbuf_addstr(&objects_directory, git_dir);
135         }
136         strbuf_addstr(&objects_directory, "/objects/");
137         if (!is_directory(objects_directory.buf)) {
138                 ret = -1;
139                 goto done;
140         }
141         /* avoid adding it twice */
142         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
143                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
144                                 !strncmp(alt_odb->base, objects_directory.buf,
145                                         objects_directory.len))
146                         goto done;
147
148         alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
149         alt_odb->next = alt_odb_list;
150         strcpy(alt_odb->base, objects_directory.buf);
151         alt_odb->name = alt_odb->base + objects_directory.len;
152         alt_odb->name[2] = '/';
153         alt_odb->name[40] = '\0';
154         alt_odb->name[41] = '\0';
155         alt_odb_list = alt_odb;
156
157         /* add possible alternates from the submodule */
158         read_info_alternates(objects_directory.buf, 0);
159         prepare_alt_odb();
160 done:
161         strbuf_release(&objects_directory);
162         return ret;
163 }
164
165 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
166                                              const char *path)
167 {
168         struct string_list_item *path_option, *ignore_option;
169         path_option = unsorted_string_list_lookup(&config_name_for_path, path);
170         if (path_option) {
171                 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
172                 if (ignore_option)
173                         handle_ignore_submodules_arg(diffopt, ignore_option->util);
174                 else if (gitmodules_is_unmerged)
175                         DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
176         }
177 }
178
179 int submodule_config(const char *var, const char *value, void *cb)
180 {
181         if (starts_with(var, "submodule."))
182                 return parse_submodule_config_option(var, value);
183         else if (!strcmp(var, "fetch.recursesubmodules")) {
184                 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
185                 return 0;
186         }
187         return 0;
188 }
189
190 void gitmodules_config(void)
191 {
192         const char *work_tree = get_git_work_tree();
193         if (work_tree) {
194                 struct strbuf gitmodules_path = STRBUF_INIT;
195                 int pos;
196                 strbuf_addstr(&gitmodules_path, work_tree);
197                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
198                 if (read_cache() < 0)
199                         die("index file corrupt");
200                 pos = cache_name_pos(".gitmodules", 11);
201                 if (pos < 0) { /* .gitmodules not found or isn't merged */
202                         pos = -1 - pos;
203                         if (active_nr > pos) {  /* there is a .gitmodules */
204                                 const struct cache_entry *ce = active_cache[pos];
205                                 if (ce_namelen(ce) == 11 &&
206                                     !memcmp(ce->name, ".gitmodules", 11))
207                                         gitmodules_is_unmerged = 1;
208                         }
209                 } else if (pos < active_nr) {
210                         struct stat st;
211                         if (lstat(".gitmodules", &st) == 0 &&
212                             ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
213                                 gitmodules_is_modified = 1;
214                 }
215
216                 if (!gitmodules_is_unmerged)
217                         git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
218                 strbuf_release(&gitmodules_path);
219         }
220 }
221
222 int parse_submodule_config_option(const char *var, const char *value)
223 {
224         struct string_list_item *config;
225         const char *name, *key;
226         int namelen;
227
228         if (parse_config_key(var, "submodule", &name, &namelen, &key) < 0 || !name)
229                 return 0;
230
231         if (!strcmp(key, "path")) {
232                 if (!value)
233                         return config_error_nonbool(var);
234
235                 config = unsorted_string_list_lookup(&config_name_for_path, value);
236                 if (config)
237                         free(config->util);
238                 else
239                         config = string_list_append(&config_name_for_path, xstrdup(value));
240                 config->util = xmemdupz(name, namelen);
241         } else if (!strcmp(key, "fetchrecursesubmodules")) {
242                 char *name_cstr = xmemdupz(name, namelen);
243                 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name_cstr);
244                 if (!config)
245                         config = string_list_append(&config_fetch_recurse_submodules_for_name, name_cstr);
246                 else
247                         free(name_cstr);
248                 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
249         } else if (!strcmp(key, "ignore")) {
250                 char *name_cstr;
251
252                 if (!value)
253                         return config_error_nonbool(var);
254
255                 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
256                     strcmp(value, "all") && strcmp(value, "none")) {
257                         warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
258                         return 0;
259                 }
260
261                 name_cstr = xmemdupz(name, namelen);
262                 config = unsorted_string_list_lookup(&config_ignore_for_name, name_cstr);
263                 if (config) {
264                         free(config->util);
265                         free(name_cstr);
266                 } else
267                         config = string_list_append(&config_ignore_for_name, name_cstr);
268                 config->util = xstrdup(value);
269                 return 0;
270         }
271         return 0;
272 }
273
274 void handle_ignore_submodules_arg(struct diff_options *diffopt,
275                                   const char *arg)
276 {
277         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
278         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
279         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
280
281         if (!strcmp(arg, "all"))
282                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
283         else if (!strcmp(arg, "untracked"))
284                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
285         else if (!strcmp(arg, "dirty"))
286                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
287         else if (strcmp(arg, "none"))
288                 die("bad --ignore-submodules argument: %s", arg);
289 }
290
291 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
292                 struct commit *left, struct commit *right,
293                 int *fast_forward, int *fast_backward)
294 {
295         struct commit_list *merge_bases, *list;
296
297         init_revisions(rev, NULL);
298         setup_revisions(0, NULL, rev, NULL);
299         rev->left_right = 1;
300         rev->first_parent_only = 1;
301         left->object.flags |= SYMMETRIC_LEFT;
302         add_pending_object(rev, &left->object, path);
303         add_pending_object(rev, &right->object, path);
304         merge_bases = get_merge_bases(left, right);
305         if (merge_bases) {
306                 if (merge_bases->item == left)
307                         *fast_forward = 1;
308                 else if (merge_bases->item == right)
309                         *fast_backward = 1;
310         }
311         for (list = merge_bases; list; list = list->next) {
312                 list->item->object.flags |= UNINTERESTING;
313                 add_pending_object(rev, &list->item->object,
314                         sha1_to_hex(list->item->object.sha1));
315         }
316         return prepare_revision_walk(rev);
317 }
318
319 static void print_submodule_summary(struct rev_info *rev, FILE *f,
320                 const char *line_prefix,
321                 const char *del, const char *add, const char *reset)
322 {
323         static const char format[] = "  %m %s";
324         struct strbuf sb = STRBUF_INIT;
325         struct commit *commit;
326
327         while ((commit = get_revision(rev))) {
328                 struct pretty_print_context ctx = {0};
329                 ctx.date_mode = rev->date_mode;
330                 ctx.output_encoding = get_log_output_encoding();
331                 strbuf_setlen(&sb, 0);
332                 strbuf_addstr(&sb, line_prefix);
333                 if (commit->object.flags & SYMMETRIC_LEFT) {
334                         if (del)
335                                 strbuf_addstr(&sb, del);
336                 }
337                 else if (add)
338                         strbuf_addstr(&sb, add);
339                 format_commit_message(commit, format, &sb, &ctx);
340                 if (reset)
341                         strbuf_addstr(&sb, reset);
342                 strbuf_addch(&sb, '\n');
343                 fprintf(f, "%s", sb.buf);
344         }
345         strbuf_release(&sb);
346 }
347
348 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
349 {
350         switch (git_config_maybe_bool(opt, arg)) {
351         case 1:
352                 return RECURSE_SUBMODULES_ON;
353         case 0:
354                 return RECURSE_SUBMODULES_OFF;
355         default:
356                 if (!strcmp(arg, "on-demand"))
357                         return RECURSE_SUBMODULES_ON_DEMAND;
358                 die("bad %s argument: %s", opt, arg);
359         }
360 }
361
362 void show_submodule_summary(FILE *f, const char *path,
363                 const char *line_prefix,
364                 unsigned char one[20], unsigned char two[20],
365                 unsigned dirty_submodule, const char *meta,
366                 const char *del, const char *add, const char *reset)
367 {
368         struct rev_info rev;
369         struct commit *left = NULL, *right = NULL;
370         const char *message = NULL;
371         struct strbuf sb = STRBUF_INIT;
372         int fast_forward = 0, fast_backward = 0;
373
374         if (is_null_sha1(two))
375                 message = "(submodule deleted)";
376         else if (add_submodule_odb(path))
377                 message = "(not checked out)";
378         else if (is_null_sha1(one))
379                 message = "(new submodule)";
380         else if (!(left = lookup_commit_reference(one)) ||
381                  !(right = lookup_commit_reference(two)))
382                 message = "(commits not present)";
383         else if (prepare_submodule_summary(&rev, path, left, right,
384                                            &fast_forward, &fast_backward))
385                 message = "(revision walker failed)";
386
387         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
388                 fprintf(f, "%sSubmodule %s contains untracked content\n",
389                         line_prefix, path);
390         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
391                 fprintf(f, "%sSubmodule %s contains modified content\n",
392                         line_prefix, path);
393
394         if (!hashcmp(one, two)) {
395                 strbuf_release(&sb);
396                 return;
397         }
398
399         strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
400                         find_unique_abbrev(one, DEFAULT_ABBREV));
401         if (!fast_backward && !fast_forward)
402                 strbuf_addch(&sb, '.');
403         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
404         if (message)
405                 strbuf_addf(&sb, " %s%s\n", message, reset);
406         else
407                 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
408         fwrite(sb.buf, sb.len, 1, f);
409
410         if (!message) /* only NULL if we succeeded in setting up the walk */
411                 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
412         if (left)
413                 clear_commit_marks(left, ~0);
414         if (right)
415                 clear_commit_marks(right, ~0);
416
417         strbuf_release(&sb);
418 }
419
420 void set_config_fetch_recurse_submodules(int value)
421 {
422         config_fetch_recurse_submodules = value;
423 }
424
425 static int has_remote(const char *refname, const struct object_id *oid,
426                       int flags, void *cb_data)
427 {
428         return 1;
429 }
430
431 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
432 {
433         if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
434                 return 0;
435
436         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
437                 struct child_process cp = CHILD_PROCESS_INIT;
438                 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
439                 struct strbuf buf = STRBUF_INIT;
440                 int needs_pushing = 0;
441
442                 argv[1] = sha1_to_hex(sha1);
443                 cp.argv = argv;
444                 cp.env = local_repo_env;
445                 cp.git_cmd = 1;
446                 cp.no_stdin = 1;
447                 cp.out = -1;
448                 cp.dir = path;
449                 if (start_command(&cp))
450                         die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
451                                 sha1_to_hex(sha1), path);
452                 if (strbuf_read(&buf, cp.out, 41))
453                         needs_pushing = 1;
454                 finish_command(&cp);
455                 close(cp.out);
456                 strbuf_release(&buf);
457                 return needs_pushing;
458         }
459
460         return 0;
461 }
462
463 static void collect_submodules_from_diff(struct diff_queue_struct *q,
464                                          struct diff_options *options,
465                                          void *data)
466 {
467         int i;
468         struct string_list *needs_pushing = data;
469
470         for (i = 0; i < q->nr; i++) {
471                 struct diff_filepair *p = q->queue[i];
472                 if (!S_ISGITLINK(p->two->mode))
473                         continue;
474                 if (submodule_needs_pushing(p->two->path, p->two->sha1))
475                         string_list_insert(needs_pushing, p->two->path);
476         }
477 }
478
479 static void find_unpushed_submodule_commits(struct commit *commit,
480                 struct string_list *needs_pushing)
481 {
482         struct rev_info rev;
483
484         init_revisions(&rev, NULL);
485         rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
486         rev.diffopt.format_callback = collect_submodules_from_diff;
487         rev.diffopt.format_callback_data = needs_pushing;
488         diff_tree_combined_merge(commit, 1, &rev);
489 }
490
491 int find_unpushed_submodules(unsigned char new_sha1[20],
492                 const char *remotes_name, struct string_list *needs_pushing)
493 {
494         struct rev_info rev;
495         struct commit *commit;
496         const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
497         int argc = ARRAY_SIZE(argv) - 1;
498         char *sha1_copy;
499
500         struct strbuf remotes_arg = STRBUF_INIT;
501
502         strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
503         init_revisions(&rev, NULL);
504         sha1_copy = xstrdup(sha1_to_hex(new_sha1));
505         argv[1] = sha1_copy;
506         argv[3] = remotes_arg.buf;
507         setup_revisions(argc, argv, &rev, NULL);
508         if (prepare_revision_walk(&rev))
509                 die("revision walk setup failed");
510
511         while ((commit = get_revision(&rev)) != NULL)
512                 find_unpushed_submodule_commits(commit, needs_pushing);
513
514         reset_revision_walk();
515         free(sha1_copy);
516         strbuf_release(&remotes_arg);
517
518         return needs_pushing->nr;
519 }
520
521 static int push_submodule(const char *path)
522 {
523         if (add_submodule_odb(path))
524                 return 1;
525
526         if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
527                 struct child_process cp = CHILD_PROCESS_INIT;
528                 const char *argv[] = {"push", NULL};
529
530                 cp.argv = argv;
531                 cp.env = local_repo_env;
532                 cp.git_cmd = 1;
533                 cp.no_stdin = 1;
534                 cp.dir = path;
535                 if (run_command(&cp))
536                         return 0;
537                 close(cp.out);
538         }
539
540         return 1;
541 }
542
543 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
544 {
545         int i, ret = 1;
546         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
547
548         if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
549                 return 1;
550
551         for (i = 0; i < needs_pushing.nr; i++) {
552                 const char *path = needs_pushing.items[i].string;
553                 fprintf(stderr, "Pushing submodule '%s'\n", path);
554                 if (!push_submodule(path)) {
555                         fprintf(stderr, "Unable to push submodule '%s'\n", path);
556                         ret = 0;
557                 }
558         }
559
560         string_list_clear(&needs_pushing, 0);
561
562         return ret;
563 }
564
565 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
566 {
567         int is_present = 0;
568         if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
569                 /* Even if the submodule is checked out and the commit is
570                  * present, make sure it is reachable from a ref. */
571                 struct child_process cp = CHILD_PROCESS_INIT;
572                 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
573                 struct strbuf buf = STRBUF_INIT;
574
575                 argv[3] = sha1_to_hex(sha1);
576                 cp.argv = argv;
577                 cp.env = local_repo_env;
578                 cp.git_cmd = 1;
579                 cp.no_stdin = 1;
580                 cp.dir = path;
581                 if (!capture_command(&cp, &buf, 1024) && !buf.len)
582                         is_present = 1;
583
584                 strbuf_release(&buf);
585         }
586         return is_present;
587 }
588
589 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
590                                          struct diff_options *options,
591                                          void *data)
592 {
593         int i;
594         for (i = 0; i < q->nr; i++) {
595                 struct diff_filepair *p = q->queue[i];
596                 if (!S_ISGITLINK(p->two->mode))
597                         continue;
598
599                 if (S_ISGITLINK(p->one->mode)) {
600                         /* NEEDSWORK: We should honor the name configured in
601                          * the .gitmodules file of the commit we are examining
602                          * here to be able to correctly follow submodules
603                          * being moved around. */
604                         struct string_list_item *path;
605                         path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
606                         if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
607                                 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
608                 } else {
609                         /* Submodule is new or was moved here */
610                         /* NEEDSWORK: When the .git directories of submodules
611                          * live inside the superprojects .git directory some
612                          * day we should fetch new submodules directly into
613                          * that location too when config or options request
614                          * that so they can be checked out from there. */
615                         continue;
616                 }
617         }
618 }
619
620 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
621                              int flags, void *data)
622 {
623         sha1_array_append(data, oid->hash);
624         return 0;
625 }
626
627 void check_for_new_submodule_commits(unsigned char new_sha1[20])
628 {
629         if (!initialized_fetch_ref_tips) {
630                 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
631                 initialized_fetch_ref_tips = 1;
632         }
633
634         sha1_array_append(&ref_tips_after_fetch, new_sha1);
635 }
636
637 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
638 {
639         argv_array_push(data, sha1_to_hex(sha1));
640 }
641
642 static void calculate_changed_submodule_paths(void)
643 {
644         struct rev_info rev;
645         struct commit *commit;
646         struct argv_array argv = ARGV_ARRAY_INIT;
647
648         /* No need to check if there are no submodules configured */
649         if (!config_name_for_path.nr)
650                 return;
651
652         init_revisions(&rev, NULL);
653         argv_array_push(&argv, "--"); /* argv[0] program name */
654         sha1_array_for_each_unique(&ref_tips_after_fetch,
655                                    add_sha1_to_argv, &argv);
656         argv_array_push(&argv, "--not");
657         sha1_array_for_each_unique(&ref_tips_before_fetch,
658                                    add_sha1_to_argv, &argv);
659         setup_revisions(argv.argc, argv.argv, &rev, NULL);
660         if (prepare_revision_walk(&rev))
661                 die("revision walk setup failed");
662
663         /*
664          * Collect all submodules (whether checked out or not) for which new
665          * commits have been recorded upstream in "changed_submodule_paths".
666          */
667         while ((commit = get_revision(&rev))) {
668                 struct commit_list *parent = commit->parents;
669                 while (parent) {
670                         struct diff_options diff_opts;
671                         diff_setup(&diff_opts);
672                         DIFF_OPT_SET(&diff_opts, RECURSIVE);
673                         diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
674                         diff_opts.format_callback = submodule_collect_changed_cb;
675                         diff_setup_done(&diff_opts);
676                         diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
677                         diffcore_std(&diff_opts);
678                         diff_flush(&diff_opts);
679                         parent = parent->next;
680                 }
681         }
682
683         argv_array_clear(&argv);
684         sha1_array_clear(&ref_tips_before_fetch);
685         sha1_array_clear(&ref_tips_after_fetch);
686         initialized_fetch_ref_tips = 0;
687 }
688
689 int fetch_populated_submodules(const struct argv_array *options,
690                                const char *prefix, int command_line_option,
691                                int quiet)
692 {
693         int i, result = 0;
694         struct child_process cp = CHILD_PROCESS_INIT;
695         struct argv_array argv = ARGV_ARRAY_INIT;
696         struct string_list_item *name_for_path;
697         const char *work_tree = get_git_work_tree();
698         if (!work_tree)
699                 goto out;
700
701         if (read_cache() < 0)
702                 die("index file corrupt");
703
704         argv_array_push(&argv, "fetch");
705         for (i = 0; i < options->argc; i++)
706                 argv_array_push(&argv, options->argv[i]);
707         argv_array_push(&argv, "--recurse-submodules-default");
708         /* default value, "--submodule-prefix" and its value are added later */
709
710         cp.env = local_repo_env;
711         cp.git_cmd = 1;
712         cp.no_stdin = 1;
713
714         calculate_changed_submodule_paths();
715
716         for (i = 0; i < active_nr; i++) {
717                 struct strbuf submodule_path = STRBUF_INIT;
718                 struct strbuf submodule_git_dir = STRBUF_INIT;
719                 struct strbuf submodule_prefix = STRBUF_INIT;
720                 const struct cache_entry *ce = active_cache[i];
721                 const char *git_dir, *name, *default_argv;
722
723                 if (!S_ISGITLINK(ce->ce_mode))
724                         continue;
725
726                 name = ce->name;
727                 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
728                 if (name_for_path)
729                         name = name_for_path->util;
730
731                 default_argv = "yes";
732                 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
733                         struct string_list_item *fetch_recurse_submodules_option;
734                         fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
735                         if (fetch_recurse_submodules_option) {
736                                 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
737                                         continue;
738                                 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
739                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
740                                                 continue;
741                                         default_argv = "on-demand";
742                                 }
743                         } else {
744                                 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
745                                     gitmodules_is_unmerged)
746                                         continue;
747                                 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
748                                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
749                                                 continue;
750                                         default_argv = "on-demand";
751                                 }
752                         }
753                 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
754                         if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
755                                 continue;
756                         default_argv = "on-demand";
757                 }
758
759                 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
760                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
761                 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
762                 git_dir = read_gitfile(submodule_git_dir.buf);
763                 if (!git_dir)
764                         git_dir = submodule_git_dir.buf;
765                 if (is_directory(git_dir)) {
766                         if (!quiet)
767                                 printf("Fetching submodule %s%s\n", prefix, ce->name);
768                         cp.dir = submodule_path.buf;
769                         argv_array_push(&argv, default_argv);
770                         argv_array_push(&argv, "--submodule-prefix");
771                         argv_array_push(&argv, submodule_prefix.buf);
772                         cp.argv = argv.argv;
773                         if (run_command(&cp))
774                                 result = 1;
775                         argv_array_pop(&argv);
776                         argv_array_pop(&argv);
777                         argv_array_pop(&argv);
778                 }
779                 strbuf_release(&submodule_path);
780                 strbuf_release(&submodule_git_dir);
781                 strbuf_release(&submodule_prefix);
782         }
783         argv_array_clear(&argv);
784 out:
785         string_list_clear(&changed_submodule_paths, 1);
786         return result;
787 }
788
789 unsigned is_submodule_modified(const char *path, int ignore_untracked)
790 {
791         ssize_t len;
792         struct child_process cp = CHILD_PROCESS_INIT;
793         const char *argv[] = {
794                 "status",
795                 "--porcelain",
796                 NULL,
797                 NULL,
798         };
799         struct strbuf buf = STRBUF_INIT;
800         unsigned dirty_submodule = 0;
801         const char *line, *next_line;
802         const char *git_dir;
803
804         strbuf_addf(&buf, "%s/.git", path);
805         git_dir = read_gitfile(buf.buf);
806         if (!git_dir)
807                 git_dir = buf.buf;
808         if (!is_directory(git_dir)) {
809                 strbuf_release(&buf);
810                 /* The submodule is not checked out, so it is not modified */
811                 return 0;
812
813         }
814         strbuf_reset(&buf);
815
816         if (ignore_untracked)
817                 argv[2] = "-uno";
818
819         cp.argv = argv;
820         cp.env = local_repo_env;
821         cp.git_cmd = 1;
822         cp.no_stdin = 1;
823         cp.out = -1;
824         cp.dir = path;
825         if (start_command(&cp))
826                 die("Could not run 'git status --porcelain' in submodule %s", path);
827
828         len = strbuf_read(&buf, cp.out, 1024);
829         line = buf.buf;
830         while (len > 2) {
831                 if ((line[0] == '?') && (line[1] == '?')) {
832                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
833                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
834                                 break;
835                 } else {
836                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
837                         if (ignore_untracked ||
838                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
839                                 break;
840                 }
841                 next_line = strchr(line, '\n');
842                 if (!next_line)
843                         break;
844                 next_line++;
845                 len -= (next_line - line);
846                 line = next_line;
847         }
848         close(cp.out);
849
850         if (finish_command(&cp))
851                 die("'git status --porcelain' failed in submodule %s", path);
852
853         strbuf_release(&buf);
854         return dirty_submodule;
855 }
856
857 int submodule_uses_gitfile(const char *path)
858 {
859         struct child_process cp = CHILD_PROCESS_INIT;
860         const char *argv[] = {
861                 "submodule",
862                 "foreach",
863                 "--quiet",
864                 "--recursive",
865                 "test -f .git",
866                 NULL,
867         };
868         struct strbuf buf = STRBUF_INIT;
869         const char *git_dir;
870
871         strbuf_addf(&buf, "%s/.git", path);
872         git_dir = read_gitfile(buf.buf);
873         if (!git_dir) {
874                 strbuf_release(&buf);
875                 return 0;
876         }
877         strbuf_release(&buf);
878
879         /* Now test that all nested submodules use a gitfile too */
880         cp.argv = argv;
881         cp.env = local_repo_env;
882         cp.git_cmd = 1;
883         cp.no_stdin = 1;
884         cp.no_stderr = 1;
885         cp.no_stdout = 1;
886         cp.dir = path;
887         if (run_command(&cp))
888                 return 0;
889
890         return 1;
891 }
892
893 int ok_to_remove_submodule(const char *path)
894 {
895         ssize_t len;
896         struct child_process cp = CHILD_PROCESS_INIT;
897         const char *argv[] = {
898                 "status",
899                 "--porcelain",
900                 "-u",
901                 "--ignore-submodules=none",
902                 NULL,
903         };
904         struct strbuf buf = STRBUF_INIT;
905         int ok_to_remove = 1;
906
907         if (!file_exists(path) || is_empty_dir(path))
908                 return 1;
909
910         if (!submodule_uses_gitfile(path))
911                 return 0;
912
913         cp.argv = argv;
914         cp.env = local_repo_env;
915         cp.git_cmd = 1;
916         cp.no_stdin = 1;
917         cp.out = -1;
918         cp.dir = path;
919         if (start_command(&cp))
920                 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
921
922         len = strbuf_read(&buf, cp.out, 1024);
923         if (len > 2)
924                 ok_to_remove = 0;
925         close(cp.out);
926
927         if (finish_command(&cp))
928                 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
929
930         strbuf_release(&buf);
931         return ok_to_remove;
932 }
933
934 static int find_first_merges(struct object_array *result, const char *path,
935                 struct commit *a, struct commit *b)
936 {
937         int i, j;
938         struct object_array merges = OBJECT_ARRAY_INIT;
939         struct commit *commit;
940         int contains_another;
941
942         char merged_revision[42];
943         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
944                                    "--all", merged_revision, NULL };
945         struct rev_info revs;
946         struct setup_revision_opt rev_opts;
947
948         memset(result, 0, sizeof(struct object_array));
949         memset(&rev_opts, 0, sizeof(rev_opts));
950
951         /* get all revisions that merge commit a */
952         snprintf(merged_revision, sizeof(merged_revision), "^%s",
953                         sha1_to_hex(a->object.sha1));
954         init_revisions(&revs, NULL);
955         rev_opts.submodule = path;
956         setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
957
958         /* save all revisions from the above list that contain b */
959         if (prepare_revision_walk(&revs))
960                 die("revision walk setup failed");
961         while ((commit = get_revision(&revs)) != NULL) {
962                 struct object *o = &(commit->object);
963                 if (in_merge_bases(b, commit))
964                         add_object_array(o, NULL, &merges);
965         }
966         reset_revision_walk();
967
968         /* Now we've got all merges that contain a and b. Prune all
969          * merges that contain another found merge and save them in
970          * result.
971          */
972         for (i = 0; i < merges.nr; i++) {
973                 struct commit *m1 = (struct commit *) merges.objects[i].item;
974
975                 contains_another = 0;
976                 for (j = 0; j < merges.nr; j++) {
977                         struct commit *m2 = (struct commit *) merges.objects[j].item;
978                         if (i != j && in_merge_bases(m2, m1)) {
979                                 contains_another = 1;
980                                 break;
981                         }
982                 }
983
984                 if (!contains_another)
985                         add_object_array(merges.objects[i].item, NULL, result);
986         }
987
988         free(merges.objects);
989         return result->nr;
990 }
991
992 static void print_commit(struct commit *commit)
993 {
994         struct strbuf sb = STRBUF_INIT;
995         struct pretty_print_context ctx = {0};
996         ctx.date_mode = DATE_NORMAL;
997         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
998         fprintf(stderr, "%s\n", sb.buf);
999         strbuf_release(&sb);
1000 }
1001
1002 #define MERGE_WARNING(path, msg) \
1003         warning("Failed to merge submodule %s (%s)", path, msg);
1004
1005 int merge_submodule(unsigned char result[20], const char *path,
1006                     const unsigned char base[20], const unsigned char a[20],
1007                     const unsigned char b[20], int search)
1008 {
1009         struct commit *commit_base, *commit_a, *commit_b;
1010         int parent_count;
1011         struct object_array merges;
1012
1013         int i;
1014
1015         /* store a in result in case we fail */
1016         hashcpy(result, a);
1017
1018         /* we can not handle deletion conflicts */
1019         if (is_null_sha1(base))
1020                 return 0;
1021         if (is_null_sha1(a))
1022                 return 0;
1023         if (is_null_sha1(b))
1024                 return 0;
1025
1026         if (add_submodule_odb(path)) {
1027                 MERGE_WARNING(path, "not checked out");
1028                 return 0;
1029         }
1030
1031         if (!(commit_base = lookup_commit_reference(base)) ||
1032             !(commit_a = lookup_commit_reference(a)) ||
1033             !(commit_b = lookup_commit_reference(b))) {
1034                 MERGE_WARNING(path, "commits not present");
1035                 return 0;
1036         }
1037
1038         /* check whether both changes are forward */
1039         if (!in_merge_bases(commit_base, commit_a) ||
1040             !in_merge_bases(commit_base, commit_b)) {
1041                 MERGE_WARNING(path, "commits don't follow merge-base");
1042                 return 0;
1043         }
1044
1045         /* Case #1: a is contained in b or vice versa */
1046         if (in_merge_bases(commit_a, commit_b)) {
1047                 hashcpy(result, b);
1048                 return 1;
1049         }
1050         if (in_merge_bases(commit_b, commit_a)) {
1051                 hashcpy(result, a);
1052                 return 1;
1053         }
1054
1055         /*
1056          * Case #2: There are one or more merges that contain a and b in
1057          * the submodule. If there is only one, then present it as a
1058          * suggestion to the user, but leave it marked unmerged so the
1059          * user needs to confirm the resolution.
1060          */
1061
1062         /* Skip the search if makes no sense to the calling context.  */
1063         if (!search)
1064                 return 0;
1065
1066         /* find commit which merges them */
1067         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1068         switch (parent_count) {
1069         case 0:
1070                 MERGE_WARNING(path, "merge following commits not found");
1071                 break;
1072
1073         case 1:
1074                 MERGE_WARNING(path, "not fast-forward");
1075                 fprintf(stderr, "Found a possible merge resolution "
1076                                 "for the submodule:\n");
1077                 print_commit((struct commit *) merges.objects[0].item);
1078                 fprintf(stderr,
1079                         "If this is correct simply add it to the index "
1080                         "for example\n"
1081                         "by using:\n\n"
1082                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1083                         "which will accept this suggestion.\n",
1084                         sha1_to_hex(merges.objects[0].item->sha1), path);
1085                 break;
1086
1087         default:
1088                 MERGE_WARNING(path, "multiple merges found");
1089                 for (i = 0; i < merges.nr; i++)
1090                         print_commit((struct commit *) merges.objects[i].item);
1091         }
1092
1093         free(merges.objects);
1094         return 0;
1095 }
1096
1097 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1098 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1099 {
1100         struct strbuf file_name = STRBUF_INIT;
1101         struct strbuf rel_path = STRBUF_INIT;
1102         const char *real_work_tree = xstrdup(real_path(work_tree));
1103
1104         /* Update gitfile */
1105         strbuf_addf(&file_name, "%s/.git", work_tree);
1106         write_file(file_name.buf, 1, "gitdir: %s\n",
1107                    relative_path(git_dir, real_work_tree, &rel_path));
1108
1109         /* Update core.worktree setting */
1110         strbuf_reset(&file_name);
1111         strbuf_addf(&file_name, "%s/config", git_dir);
1112         if (git_config_set_in_file(file_name.buf, "core.worktree",
1113                                    relative_path(real_work_tree, git_dir,
1114                                                  &rel_path)))
1115                 die(_("Could not set core.worktree in %s"),
1116                     file_name.buf);
1117
1118         strbuf_release(&file_name);
1119         strbuf_release(&rel_path);
1120         free((void *)real_work_tree);
1121 }