Merge branch 'mh/packed-ref-store'
[git/git.git] / submodule.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "submodule-config.h"
5 #include "submodule.h"
6 #include "dir.h"
7 #include "diff.h"
8 #include "commit.h"
9 #include "revision.h"
10 #include "run-command.h"
11 #include "diffcore.h"
12 #include "refs.h"
13 #include "string-list.h"
14 #include "sha1-array.h"
15 #include "argv-array.h"
16 #include "blob.h"
17 #include "thread-utils.h"
18 #include "quote.h"
19 #include "remote.h"
20 #include "worktree.h"
21 #include "parse-options.h"
22
23 static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
24 static struct string_list changed_submodule_paths = STRING_LIST_INIT_DUP;
25 static int initialized_fetch_ref_tips;
26 static struct oid_array ref_tips_before_fetch;
27 static struct oid_array ref_tips_after_fetch;
28
29 /*
30 * Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
31 * will be disabled because we can't guess what might be configured in
32 * .gitmodules unless the user resolves the conflict.
33 */
34 int is_gitmodules_unmerged(const struct index_state *istate)
35 {
36 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
37 if (pos < 0) { /* .gitmodules not found or isn't merged */
38 pos = -1 - pos;
39 if (istate->cache_nr > pos) { /* there is a .gitmodules */
40 const struct cache_entry *ce = istate->cache[pos];
41 if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
42 !strcmp(ce->name, GITMODULES_FILE))
43 return 1;
44 }
45 }
46
47 return 0;
48 }
49
50 /*
51 * Check if the .gitmodules file has unstaged modifications. This must be
52 * checked before allowing modifications to the .gitmodules file with the
53 * intention to stage them later, because when continuing we would stage the
54 * modifications the user didn't stage herself too. That might change in a
55 * future version when we learn to stage the changes we do ourselves without
56 * staging any previous modifications.
57 */
58 int is_staging_gitmodules_ok(const struct index_state *istate)
59 {
60 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
61
62 if ((pos >= 0) && (pos < istate->cache_nr)) {
63 struct stat st;
64 if (lstat(GITMODULES_FILE, &st) == 0 &&
65 ce_match_stat(istate->cache[pos], &st, 0) & DATA_CHANGED)
66 return 0;
67 }
68
69 return 1;
70 }
71
72 /*
73 * Try to update the "path" entry in the "submodule.<name>" section of the
74 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
75 * with the correct path=<oldpath> setting was found and we could update it.
76 */
77 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
78 {
79 struct strbuf entry = STRBUF_INIT;
80 const struct submodule *submodule;
81
82 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
83 return -1;
84
85 if (is_gitmodules_unmerged(&the_index))
86 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
87
88 submodule = submodule_from_path(&null_oid, oldpath);
89 if (!submodule || !submodule->name) {
90 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
91 return -1;
92 }
93 strbuf_addstr(&entry, "submodule.");
94 strbuf_addstr(&entry, submodule->name);
95 strbuf_addstr(&entry, ".path");
96 if (git_config_set_in_file_gently(GITMODULES_FILE, entry.buf, newpath) < 0) {
97 /* Maybe the user already did that, don't error out here */
98 warning(_("Could not update .gitmodules entry %s"), entry.buf);
99 strbuf_release(&entry);
100 return -1;
101 }
102 strbuf_release(&entry);
103 return 0;
104 }
105
106 /*
107 * Try to remove the "submodule.<name>" section from .gitmodules where the given
108 * path is configured. Return 0 only if a .gitmodules file was found, a section
109 * with the correct path=<path> setting was found and we could remove it.
110 */
111 int remove_path_from_gitmodules(const char *path)
112 {
113 struct strbuf sect = STRBUF_INIT;
114 const struct submodule *submodule;
115
116 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
117 return -1;
118
119 if (is_gitmodules_unmerged(&the_index))
120 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
121
122 submodule = submodule_from_path(&null_oid, path);
123 if (!submodule || !submodule->name) {
124 warning(_("Could not find section in .gitmodules where path=%s"), path);
125 return -1;
126 }
127 strbuf_addstr(&sect, "submodule.");
128 strbuf_addstr(&sect, submodule->name);
129 if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
130 /* Maybe the user already did that, don't error out here */
131 warning(_("Could not remove .gitmodules entry for %s"), path);
132 strbuf_release(&sect);
133 return -1;
134 }
135 strbuf_release(&sect);
136 return 0;
137 }
138
139 void stage_updated_gitmodules(void)
140 {
141 if (add_file_to_cache(GITMODULES_FILE, 0))
142 die(_("staging updated .gitmodules failed"));
143 }
144
145 static int add_submodule_odb(const char *path)
146 {
147 struct strbuf objects_directory = STRBUF_INIT;
148 int ret = 0;
149
150 ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
151 if (ret)
152 goto done;
153 if (!is_directory(objects_directory.buf)) {
154 ret = -1;
155 goto done;
156 }
157 add_to_alternates_memory(objects_directory.buf);
158 done:
159 strbuf_release(&objects_directory);
160 return ret;
161 }
162
163 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
164 const char *path)
165 {
166 const struct submodule *submodule = submodule_from_path(&null_oid, path);
167 if (submodule) {
168 if (submodule->ignore)
169 handle_ignore_submodules_arg(diffopt, submodule->ignore);
170 else if (is_gitmodules_unmerged(&the_index))
171 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
172 }
173 }
174
175 /* For loading from the .gitmodules file. */
176 static int git_modules_config(const char *var, const char *value, void *cb)
177 {
178 if (starts_with(var, "submodule."))
179 return parse_submodule_config_option(var, value);
180 return 0;
181 }
182
183 /* Loads all submodule settings from the config. */
184 int submodule_config(const char *var, const char *value, void *cb)
185 {
186 if (!strcmp(var, "submodule.recurse")) {
187 int v = git_config_bool(var, value) ?
188 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
189 config_update_recurse_submodules = v;
190 return 0;
191 } else {
192 return git_modules_config(var, value, cb);
193 }
194 }
195
196 /* Cheap function that only determines if we're interested in submodules at all */
197 int git_default_submodule_config(const char *var, const char *value, void *cb)
198 {
199 if (!strcmp(var, "submodule.recurse")) {
200 int v = git_config_bool(var, value) ?
201 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
202 config_update_recurse_submodules = v;
203 }
204 return 0;
205 }
206
207 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
208 const char *arg, int unset)
209 {
210 if (unset) {
211 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
212 return 0;
213 }
214 if (arg)
215 config_update_recurse_submodules =
216 parse_update_recurse_submodules_arg(opt->long_name,
217 arg);
218 else
219 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
220
221 return 0;
222 }
223
224 void load_submodule_cache(void)
225 {
226 if (config_update_recurse_submodules == RECURSE_SUBMODULES_OFF)
227 return;
228
229 gitmodules_config();
230 git_config(submodule_config, NULL);
231 }
232
233 static int gitmodules_cb(const char *var, const char *value, void *data)
234 {
235 struct repository *repo = data;
236 return submodule_config_option(repo, var, value);
237 }
238
239 void repo_read_gitmodules(struct repository *repo)
240 {
241 if (repo->worktree) {
242 char *gitmodules;
243
244 if (repo_read_index(repo) < 0)
245 return;
246
247 gitmodules = repo_worktree_path(repo, GITMODULES_FILE);
248
249 if (!is_gitmodules_unmerged(repo->index))
250 git_config_from_file(gitmodules_cb, gitmodules, repo);
251
252 free(gitmodules);
253 }
254 }
255
256 void gitmodules_config(void)
257 {
258 repo_read_gitmodules(the_repository);
259 }
260
261 void gitmodules_config_oid(const struct object_id *commit_oid)
262 {
263 struct strbuf rev = STRBUF_INIT;
264 struct object_id oid;
265
266 if (gitmodule_oid_from_commit(commit_oid, &oid, &rev)) {
267 git_config_from_blob_oid(submodule_config, rev.buf,
268 &oid, NULL);
269 }
270 strbuf_release(&rev);
271 }
272
273 /*
274 * Determine if a submodule has been initialized at a given 'path'
275 */
276 int is_submodule_active(struct repository *repo, const char *path)
277 {
278 int ret = 0;
279 char *key = NULL;
280 char *value = NULL;
281 const struct string_list *sl;
282 const struct submodule *module;
283
284 module = submodule_from_cache(repo, &null_oid, path);
285
286 /* early return if there isn't a path->module mapping */
287 if (!module)
288 return 0;
289
290 /* submodule.<name>.active is set */
291 key = xstrfmt("submodule.%s.active", module->name);
292 if (!repo_config_get_bool(repo, key, &ret)) {
293 free(key);
294 return ret;
295 }
296 free(key);
297
298 /* submodule.active is set */
299 sl = repo_config_get_value_multi(repo, "submodule.active");
300 if (sl) {
301 struct pathspec ps;
302 struct argv_array args = ARGV_ARRAY_INIT;
303 const struct string_list_item *item;
304
305 for_each_string_list_item(item, sl) {
306 argv_array_push(&args, item->string);
307 }
308
309 parse_pathspec(&ps, 0, 0, NULL, args.argv);
310 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
311
312 argv_array_clear(&args);
313 clear_pathspec(&ps);
314 return ret;
315 }
316
317 /* fallback to checking if the URL is set */
318 key = xstrfmt("submodule.%s.url", module->name);
319 ret = !repo_config_get_string(repo, key, &value);
320
321 free(value);
322 free(key);
323 return ret;
324 }
325
326 int is_submodule_populated_gently(const char *path, int *return_error_code)
327 {
328 int ret = 0;
329 char *gitdir = xstrfmt("%s/.git", path);
330
331 if (resolve_gitdir_gently(gitdir, return_error_code))
332 ret = 1;
333
334 free(gitdir);
335 return ret;
336 }
337
338 /*
339 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
340 */
341 void die_in_unpopulated_submodule(const struct index_state *istate,
342 const char *prefix)
343 {
344 int i, prefixlen;
345
346 if (!prefix)
347 return;
348
349 prefixlen = strlen(prefix);
350
351 for (i = 0; i < istate->cache_nr; i++) {
352 struct cache_entry *ce = istate->cache[i];
353 int ce_len = ce_namelen(ce);
354
355 if (!S_ISGITLINK(ce->ce_mode))
356 continue;
357 if (prefixlen <= ce_len)
358 continue;
359 if (strncmp(ce->name, prefix, ce_len))
360 continue;
361 if (prefix[ce_len] != '/')
362 continue;
363
364 die(_("in unpopulated submodule '%s'"), ce->name);
365 }
366 }
367
368 /*
369 * Dies if any paths in the provided pathspec descends into a submodule
370 */
371 void die_path_inside_submodule(const struct index_state *istate,
372 const struct pathspec *ps)
373 {
374 int i, j;
375
376 for (i = 0; i < istate->cache_nr; i++) {
377 struct cache_entry *ce = istate->cache[i];
378 int ce_len = ce_namelen(ce);
379
380 if (!S_ISGITLINK(ce->ce_mode))
381 continue;
382
383 for (j = 0; j < ps->nr ; j++) {
384 const struct pathspec_item *item = &ps->items[j];
385
386 if (item->len <= ce_len)
387 continue;
388 if (item->match[ce_len] != '/')
389 continue;
390 if (strncmp(ce->name, item->match, ce_len))
391 continue;
392 if (item->len == ce_len + 1)
393 continue;
394
395 die(_("Pathspec '%s' is in submodule '%.*s'"),
396 item->original, ce_len, ce->name);
397 }
398 }
399 }
400
401 int parse_submodule_update_strategy(const char *value,
402 struct submodule_update_strategy *dst)
403 {
404 free((void*)dst->command);
405 dst->command = NULL;
406 if (!strcmp(value, "none"))
407 dst->type = SM_UPDATE_NONE;
408 else if (!strcmp(value, "checkout"))
409 dst->type = SM_UPDATE_CHECKOUT;
410 else if (!strcmp(value, "rebase"))
411 dst->type = SM_UPDATE_REBASE;
412 else if (!strcmp(value, "merge"))
413 dst->type = SM_UPDATE_MERGE;
414 else if (skip_prefix(value, "!", &value)) {
415 dst->type = SM_UPDATE_COMMAND;
416 dst->command = xstrdup(value);
417 } else
418 return -1;
419 return 0;
420 }
421
422 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
423 {
424 struct strbuf sb = STRBUF_INIT;
425 switch (s->type) {
426 case SM_UPDATE_CHECKOUT:
427 return "checkout";
428 case SM_UPDATE_MERGE:
429 return "merge";
430 case SM_UPDATE_REBASE:
431 return "rebase";
432 case SM_UPDATE_NONE:
433 return "none";
434 case SM_UPDATE_UNSPECIFIED:
435 return NULL;
436 case SM_UPDATE_COMMAND:
437 strbuf_addf(&sb, "!%s", s->command);
438 return strbuf_detach(&sb, NULL);
439 }
440 return NULL;
441 }
442
443 void handle_ignore_submodules_arg(struct diff_options *diffopt,
444 const char *arg)
445 {
446 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
447 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
448 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
449
450 if (!strcmp(arg, "all"))
451 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
452 else if (!strcmp(arg, "untracked"))
453 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
454 else if (!strcmp(arg, "dirty"))
455 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
456 else if (strcmp(arg, "none"))
457 die("bad --ignore-submodules argument: %s", arg);
458 }
459
460 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
461 struct commit *left, struct commit *right,
462 struct commit_list *merge_bases)
463 {
464 struct commit_list *list;
465
466 init_revisions(rev, NULL);
467 setup_revisions(0, NULL, rev, NULL);
468 rev->left_right = 1;
469 rev->first_parent_only = 1;
470 left->object.flags |= SYMMETRIC_LEFT;
471 add_pending_object(rev, &left->object, path);
472 add_pending_object(rev, &right->object, path);
473 for (list = merge_bases; list; list = list->next) {
474 list->item->object.flags |= UNINTERESTING;
475 add_pending_object(rev, &list->item->object,
476 oid_to_hex(&list->item->object.oid));
477 }
478 return prepare_revision_walk(rev);
479 }
480
481 static void print_submodule_summary(struct rev_info *rev, FILE *f,
482 const char *line_prefix,
483 const char *del, const char *add, const char *reset)
484 {
485 static const char format[] = " %m %s";
486 struct strbuf sb = STRBUF_INIT;
487 struct commit *commit;
488
489 while ((commit = get_revision(rev))) {
490 struct pretty_print_context ctx = {0};
491 ctx.date_mode = rev->date_mode;
492 ctx.output_encoding = get_log_output_encoding();
493 strbuf_setlen(&sb, 0);
494 strbuf_addstr(&sb, line_prefix);
495 if (commit->object.flags & SYMMETRIC_LEFT) {
496 if (del)
497 strbuf_addstr(&sb, del);
498 }
499 else if (add)
500 strbuf_addstr(&sb, add);
501 format_commit_message(commit, format, &sb, &ctx);
502 if (reset)
503 strbuf_addstr(&sb, reset);
504 strbuf_addch(&sb, '\n');
505 fprintf(f, "%s", sb.buf);
506 }
507 strbuf_release(&sb);
508 }
509
510 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
511 {
512 const char * const *var;
513
514 for (var = local_repo_env; *var; var++) {
515 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
516 argv_array_push(out, *var);
517 }
518 }
519
520 void prepare_submodule_repo_env(struct argv_array *out)
521 {
522 prepare_submodule_repo_env_no_git_dir(out);
523 argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
524 DEFAULT_GIT_DIR_ENVIRONMENT);
525 }
526
527 /* Helper function to display the submodule header line prior to the full
528 * summary output. If it can locate the submodule objects directory it will
529 * attempt to lookup both the left and right commits and put them into the
530 * left and right pointers.
531 */
532 static void show_submodule_header(FILE *f, const char *path,
533 const char *line_prefix,
534 struct object_id *one, struct object_id *two,
535 unsigned dirty_submodule, const char *meta,
536 const char *reset,
537 struct commit **left, struct commit **right,
538 struct commit_list **merge_bases)
539 {
540 const char *message = NULL;
541 struct strbuf sb = STRBUF_INIT;
542 int fast_forward = 0, fast_backward = 0;
543
544 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
545 fprintf(f, "%sSubmodule %s contains untracked content\n",
546 line_prefix, path);
547 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
548 fprintf(f, "%sSubmodule %s contains modified content\n",
549 line_prefix, path);
550
551 if (is_null_oid(one))
552 message = "(new submodule)";
553 else if (is_null_oid(two))
554 message = "(submodule deleted)";
555
556 if (add_submodule_odb(path)) {
557 if (!message)
558 message = "(not initialized)";
559 goto output_header;
560 }
561
562 /*
563 * Attempt to lookup the commit references, and determine if this is
564 * a fast forward or fast backwards update.
565 */
566 *left = lookup_commit_reference(one);
567 *right = lookup_commit_reference(two);
568
569 /*
570 * Warn about missing commits in the submodule project, but only if
571 * they aren't null.
572 */
573 if ((!is_null_oid(one) && !*left) ||
574 (!is_null_oid(two) && !*right))
575 message = "(commits not present)";
576
577 *merge_bases = get_merge_bases(*left, *right);
578 if (*merge_bases) {
579 if ((*merge_bases)->item == *left)
580 fast_forward = 1;
581 else if ((*merge_bases)->item == *right)
582 fast_backward = 1;
583 }
584
585 if (!oidcmp(one, two)) {
586 strbuf_release(&sb);
587 return;
588 }
589
590 output_header:
591 strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path);
592 strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
593 strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
594 strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
595 if (message)
596 strbuf_addf(&sb, " %s%s\n", message, reset);
597 else
598 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
599 fwrite(sb.buf, sb.len, 1, f);
600
601 strbuf_release(&sb);
602 }
603
604 void show_submodule_summary(FILE *f, const char *path,
605 const char *line_prefix,
606 struct object_id *one, struct object_id *two,
607 unsigned dirty_submodule, const char *meta,
608 const char *del, const char *add, const char *reset)
609 {
610 struct rev_info rev;
611 struct commit *left = NULL, *right = NULL;
612 struct commit_list *merge_bases = NULL;
613
614 show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
615 meta, reset, &left, &right, &merge_bases);
616
617 /*
618 * If we don't have both a left and a right pointer, there is no
619 * reason to try and display a summary. The header line should contain
620 * all the information the user needs.
621 */
622 if (!left || !right)
623 goto out;
624
625 /* Treat revision walker failure the same as missing commits */
626 if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
627 fprintf(f, "%s(revision walker failed)\n", line_prefix);
628 goto out;
629 }
630
631 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
632
633 out:
634 if (merge_bases)
635 free_commit_list(merge_bases);
636 clear_commit_marks(left, ~0);
637 clear_commit_marks(right, ~0);
638 }
639
640 void show_submodule_inline_diff(FILE *f, const char *path,
641 const char *line_prefix,
642 struct object_id *one, struct object_id *two,
643 unsigned dirty_submodule, const char *meta,
644 const char *del, const char *add, const char *reset,
645 const struct diff_options *o)
646 {
647 const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
648 struct commit *left = NULL, *right = NULL;
649 struct commit_list *merge_bases = NULL;
650 struct strbuf submodule_dir = STRBUF_INIT;
651 struct child_process cp = CHILD_PROCESS_INIT;
652
653 show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
654 meta, reset, &left, &right, &merge_bases);
655
656 /* We need a valid left and right commit to display a difference */
657 if (!(left || is_null_oid(one)) ||
658 !(right || is_null_oid(two)))
659 goto done;
660
661 if (left)
662 old = one;
663 if (right)
664 new = two;
665
666 fflush(f);
667 cp.git_cmd = 1;
668 cp.dir = path;
669 cp.out = dup(fileno(f));
670 cp.no_stdin = 1;
671
672 /* TODO: other options may need to be passed here. */
673 argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
674
675 argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
676 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
677 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
678 o->b_prefix, path);
679 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
680 o->a_prefix, path);
681 } else {
682 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
683 o->a_prefix, path);
684 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
685 o->b_prefix, path);
686 }
687 argv_array_push(&cp.args, oid_to_hex(old));
688 /*
689 * If the submodule has modified content, we will diff against the
690 * work tree, under the assumption that the user has asked for the
691 * diff format and wishes to actually see all differences even if they
692 * haven't yet been committed to the submodule yet.
693 */
694 if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
695 argv_array_push(&cp.args, oid_to_hex(new));
696
697 prepare_submodule_repo_env(&cp.env_array);
698 if (run_command(&cp))
699 fprintf(f, "(diff failed)\n");
700
701 done:
702 strbuf_release(&submodule_dir);
703 if (merge_bases)
704 free_commit_list(merge_bases);
705 if (left)
706 clear_commit_marks(left, ~0);
707 if (right)
708 clear_commit_marks(right, ~0);
709 }
710
711 int should_update_submodules(void)
712 {
713 return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
714 }
715
716 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
717 {
718 if (!S_ISGITLINK(ce->ce_mode))
719 return NULL;
720
721 if (!should_update_submodules())
722 return NULL;
723
724 return submodule_from_path(&null_oid, ce->name);
725 }
726
727 static struct oid_array *submodule_commits(struct string_list *submodules,
728 const char *path)
729 {
730 struct string_list_item *item;
731
732 item = string_list_insert(submodules, path);
733 if (item->util)
734 return (struct oid_array *) item->util;
735
736 /* NEEDSWORK: should we have oid_array_init()? */
737 item->util = xcalloc(1, sizeof(struct oid_array));
738 return (struct oid_array *) item->util;
739 }
740
741 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
742 struct diff_options *options,
743 void *data)
744 {
745 int i;
746 struct string_list *changed = data;
747
748 for (i = 0; i < q->nr; i++) {
749 struct diff_filepair *p = q->queue[i];
750 struct oid_array *commits;
751 if (!S_ISGITLINK(p->two->mode))
752 continue;
753
754 if (S_ISGITLINK(p->one->mode)) {
755 /*
756 * NEEDSWORK: We should honor the name configured in
757 * the .gitmodules file of the commit we are examining
758 * here to be able to correctly follow submodules
759 * being moved around.
760 */
761 commits = submodule_commits(changed, p->two->path);
762 oid_array_append(commits, &p->two->oid);
763 } else {
764 /* Submodule is new or was moved here */
765 /*
766 * NEEDSWORK: When the .git directories of submodules
767 * live inside the superprojects .git directory some
768 * day we should fetch new submodules directly into
769 * that location too when config or options request
770 * that so they can be checked out from there.
771 */
772 continue;
773 }
774 }
775 }
776
777 /*
778 * Collect the paths of submodules in 'changed' which have changed based on
779 * the revisions as specified in 'argv'. Each entry in 'changed' will also
780 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
781 * what the submodule pointers were updated to during the change.
782 */
783 static void collect_changed_submodules(struct string_list *changed,
784 struct argv_array *argv)
785 {
786 struct rev_info rev;
787 const struct commit *commit;
788
789 init_revisions(&rev, NULL);
790 setup_revisions(argv->argc, argv->argv, &rev, NULL);
791 if (prepare_revision_walk(&rev))
792 die("revision walk setup failed");
793
794 while ((commit = get_revision(&rev))) {
795 struct rev_info diff_rev;
796
797 init_revisions(&diff_rev, NULL);
798 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
799 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
800 diff_rev.diffopt.format_callback_data = changed;
801 diff_tree_combined_merge(commit, 1, &diff_rev);
802 }
803
804 reset_revision_walk();
805 }
806
807 static void free_submodules_oids(struct string_list *submodules)
808 {
809 struct string_list_item *item;
810 for_each_string_list_item(item, submodules)
811 oid_array_clear((struct oid_array *) item->util);
812 string_list_clear(submodules, 1);
813 }
814
815 static int has_remote(const char *refname, const struct object_id *oid,
816 int flags, void *cb_data)
817 {
818 return 1;
819 }
820
821 static int append_oid_to_argv(const struct object_id *oid, void *data)
822 {
823 struct argv_array *argv = data;
824 argv_array_push(argv, oid_to_hex(oid));
825 return 0;
826 }
827
828 static int check_has_commit(const struct object_id *oid, void *data)
829 {
830 int *has_commit = data;
831
832 if (!lookup_commit_reference(oid))
833 *has_commit = 0;
834
835 return 0;
836 }
837
838 static int submodule_has_commits(const char *path, struct oid_array *commits)
839 {
840 int has_commit = 1;
841
842 /*
843 * Perform a cheap, but incorrect check for the existence of 'commits'.
844 * This is done by adding the submodule's object store to the in-core
845 * object store, and then querying for each commit's existence. If we
846 * do not have the commit object anywhere, there is no chance we have
847 * it in the object store of the correct submodule and have it
848 * reachable from a ref, so we can fail early without spawning rev-list
849 * which is expensive.
850 */
851 if (add_submodule_odb(path))
852 return 0;
853
854 oid_array_for_each_unique(commits, check_has_commit, &has_commit);
855
856 if (has_commit) {
857 /*
858 * Even if the submodule is checked out and the commit is
859 * present, make sure it exists in the submodule's object store
860 * and that it is reachable from a ref.
861 */
862 struct child_process cp = CHILD_PROCESS_INIT;
863 struct strbuf out = STRBUF_INIT;
864
865 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
866 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
867 argv_array_pushl(&cp.args, "--not", "--all", NULL);
868
869 prepare_submodule_repo_env(&cp.env_array);
870 cp.git_cmd = 1;
871 cp.no_stdin = 1;
872 cp.dir = path;
873
874 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
875 has_commit = 0;
876
877 strbuf_release(&out);
878 }
879
880 return has_commit;
881 }
882
883 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
884 {
885 if (!submodule_has_commits(path, commits))
886 /*
887 * NOTE: We do consider it safe to return "no" here. The
888 * correct answer would be "We do not know" instead of
889 * "No push needed", but it is quite hard to change
890 * the submodule pointer without having the submodule
891 * around. If a user did however change the submodules
892 * without having the submodule around, this indicates
893 * an expert who knows what they are doing or a
894 * maintainer integrating work from other people. In
895 * both cases it should be safe to skip this check.
896 */
897 return 0;
898
899 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
900 struct child_process cp = CHILD_PROCESS_INIT;
901 struct strbuf buf = STRBUF_INIT;
902 int needs_pushing = 0;
903
904 argv_array_push(&cp.args, "rev-list");
905 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
906 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
907
908 prepare_submodule_repo_env(&cp.env_array);
909 cp.git_cmd = 1;
910 cp.no_stdin = 1;
911 cp.out = -1;
912 cp.dir = path;
913 if (start_command(&cp))
914 die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
915 path);
916 if (strbuf_read(&buf, cp.out, 41))
917 needs_pushing = 1;
918 finish_command(&cp);
919 close(cp.out);
920 strbuf_release(&buf);
921 return needs_pushing;
922 }
923
924 return 0;
925 }
926
927 int find_unpushed_submodules(struct oid_array *commits,
928 const char *remotes_name, struct string_list *needs_pushing)
929 {
930 struct string_list submodules = STRING_LIST_INIT_DUP;
931 struct string_list_item *submodule;
932 struct argv_array argv = ARGV_ARRAY_INIT;
933
934 /* argv.argv[0] will be ignored by setup_revisions */
935 argv_array_push(&argv, "find_unpushed_submodules");
936 oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
937 argv_array_push(&argv, "--not");
938 argv_array_pushf(&argv, "--remotes=%s", remotes_name);
939
940 collect_changed_submodules(&submodules, &argv);
941
942 for_each_string_list_item(submodule, &submodules) {
943 struct oid_array *commits = submodule->util;
944 const char *path = submodule->string;
945
946 if (submodule_needs_pushing(path, commits))
947 string_list_insert(needs_pushing, path);
948 }
949
950 free_submodules_oids(&submodules);
951 argv_array_clear(&argv);
952
953 return needs_pushing->nr;
954 }
955
956 static int push_submodule(const char *path,
957 const struct remote *remote,
958 const char **refspec, int refspec_nr,
959 const struct string_list *push_options,
960 int dry_run)
961 {
962 if (add_submodule_odb(path))
963 return 1;
964
965 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
966 struct child_process cp = CHILD_PROCESS_INIT;
967 argv_array_push(&cp.args, "push");
968 if (dry_run)
969 argv_array_push(&cp.args, "--dry-run");
970
971 if (push_options && push_options->nr) {
972 const struct string_list_item *item;
973 for_each_string_list_item(item, push_options)
974 argv_array_pushf(&cp.args, "--push-option=%s",
975 item->string);
976 }
977
978 if (remote->origin != REMOTE_UNCONFIGURED) {
979 int i;
980 argv_array_push(&cp.args, remote->name);
981 for (i = 0; i < refspec_nr; i++)
982 argv_array_push(&cp.args, refspec[i]);
983 }
984
985 prepare_submodule_repo_env(&cp.env_array);
986 cp.git_cmd = 1;
987 cp.no_stdin = 1;
988 cp.dir = path;
989 if (run_command(&cp))
990 return 0;
991 close(cp.out);
992 }
993
994 return 1;
995 }
996
997 /*
998 * Perform a check in the submodule to see if the remote and refspec work.
999 * Die if the submodule can't be pushed.
1000 */
1001 static void submodule_push_check(const char *path, const char *head,
1002 const struct remote *remote,
1003 const char **refspec, int refspec_nr)
1004 {
1005 struct child_process cp = CHILD_PROCESS_INIT;
1006 int i;
1007
1008 argv_array_push(&cp.args, "submodule--helper");
1009 argv_array_push(&cp.args, "push-check");
1010 argv_array_push(&cp.args, head);
1011 argv_array_push(&cp.args, remote->name);
1012
1013 for (i = 0; i < refspec_nr; i++)
1014 argv_array_push(&cp.args, refspec[i]);
1015
1016 prepare_submodule_repo_env(&cp.env_array);
1017 cp.git_cmd = 1;
1018 cp.no_stdin = 1;
1019 cp.no_stdout = 1;
1020 cp.dir = path;
1021
1022 /*
1023 * Simply indicate if 'submodule--helper push-check' failed.
1024 * More detailed error information will be provided by the
1025 * child process.
1026 */
1027 if (run_command(&cp))
1028 die("process for submodule '%s' failed", path);
1029 }
1030
1031 int push_unpushed_submodules(struct oid_array *commits,
1032 const struct remote *remote,
1033 const char **refspec, int refspec_nr,
1034 const struct string_list *push_options,
1035 int dry_run)
1036 {
1037 int i, ret = 1;
1038 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1039
1040 if (!find_unpushed_submodules(commits, remote->name, &needs_pushing))
1041 return 1;
1042
1043 /*
1044 * Verify that the remote and refspec can be propagated to all
1045 * submodules. This check can be skipped if the remote and refspec
1046 * won't be propagated due to the remote being unconfigured (e.g. a URL
1047 * instead of a remote name).
1048 */
1049 if (remote->origin != REMOTE_UNCONFIGURED) {
1050 char *head;
1051 struct object_id head_oid;
1052
1053 head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
1054 if (!head)
1055 die(_("Failed to resolve HEAD as a valid ref."));
1056
1057 for (i = 0; i < needs_pushing.nr; i++)
1058 submodule_push_check(needs_pushing.items[i].string,
1059 head, remote,
1060 refspec, refspec_nr);
1061 free(head);
1062 }
1063
1064 /* Actually push the submodules */
1065 for (i = 0; i < needs_pushing.nr; i++) {
1066 const char *path = needs_pushing.items[i].string;
1067 fprintf(stderr, "Pushing submodule '%s'\n", path);
1068 if (!push_submodule(path, remote, refspec, refspec_nr,
1069 push_options, dry_run)) {
1070 fprintf(stderr, "Unable to push submodule '%s'\n", path);
1071 ret = 0;
1072 }
1073 }
1074
1075 string_list_clear(&needs_pushing, 0);
1076
1077 return ret;
1078 }
1079
1080 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1081 int flags, void *data)
1082 {
1083 struct oid_array *array = data;
1084 oid_array_append(array, oid);
1085 return 0;
1086 }
1087
1088 void check_for_new_submodule_commits(struct object_id *oid)
1089 {
1090 if (!initialized_fetch_ref_tips) {
1091 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1092 initialized_fetch_ref_tips = 1;
1093 }
1094
1095 oid_array_append(&ref_tips_after_fetch, oid);
1096 }
1097
1098 static void calculate_changed_submodule_paths(void)
1099 {
1100 struct argv_array argv = ARGV_ARRAY_INIT;
1101 struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1102 const struct string_list_item *item;
1103
1104 /* No need to check if there are no submodules configured */
1105 if (!submodule_from_path(NULL, NULL))
1106 return;
1107
1108 argv_array_push(&argv, "--"); /* argv[0] program name */
1109 oid_array_for_each_unique(&ref_tips_after_fetch,
1110 append_oid_to_argv, &argv);
1111 argv_array_push(&argv, "--not");
1112 oid_array_for_each_unique(&ref_tips_before_fetch,
1113 append_oid_to_argv, &argv);
1114
1115 /*
1116 * Collect all submodules (whether checked out or not) for which new
1117 * commits have been recorded upstream in "changed_submodule_paths".
1118 */
1119 collect_changed_submodules(&changed_submodules, &argv);
1120
1121 for_each_string_list_item(item, &changed_submodules) {
1122 struct oid_array *commits = item->util;
1123 const char *path = item->string;
1124
1125 if (!submodule_has_commits(path, commits))
1126 string_list_append(&changed_submodule_paths, path);
1127 }
1128
1129 free_submodules_oids(&changed_submodules);
1130 argv_array_clear(&argv);
1131 oid_array_clear(&ref_tips_before_fetch);
1132 oid_array_clear(&ref_tips_after_fetch);
1133 initialized_fetch_ref_tips = 0;
1134 }
1135
1136 int submodule_touches_in_range(struct object_id *excl_oid,
1137 struct object_id *incl_oid)
1138 {
1139 struct string_list subs = STRING_LIST_INIT_DUP;
1140 struct argv_array args = ARGV_ARRAY_INIT;
1141 int ret;
1142
1143 gitmodules_config();
1144 /* No need to check if there are no submodules configured */
1145 if (!submodule_from_path(NULL, NULL))
1146 return 0;
1147
1148 argv_array_push(&args, "--"); /* args[0] program name */
1149 argv_array_push(&args, oid_to_hex(incl_oid));
1150 argv_array_push(&args, "--not");
1151 argv_array_push(&args, oid_to_hex(excl_oid));
1152
1153 collect_changed_submodules(&subs, &args);
1154 ret = subs.nr;
1155
1156 argv_array_clear(&args);
1157
1158 free_submodules_oids(&subs);
1159 return ret;
1160 }
1161
1162 struct submodule_parallel_fetch {
1163 int count;
1164 struct argv_array args;
1165 const char *work_tree;
1166 const char *prefix;
1167 int command_line_option;
1168 int default_option;
1169 int quiet;
1170 int result;
1171 };
1172 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}
1173
1174 static int get_next_submodule(struct child_process *cp,
1175 struct strbuf *err, void *data, void **task_cb)
1176 {
1177 int ret = 0;
1178 struct submodule_parallel_fetch *spf = data;
1179
1180 for (; spf->count < active_nr; spf->count++) {
1181 struct strbuf submodule_path = STRBUF_INIT;
1182 struct strbuf submodule_git_dir = STRBUF_INIT;
1183 struct strbuf submodule_prefix = STRBUF_INIT;
1184 const struct cache_entry *ce = active_cache[spf->count];
1185 const char *git_dir, *default_argv;
1186 const struct submodule *submodule;
1187
1188 if (!S_ISGITLINK(ce->ce_mode))
1189 continue;
1190
1191 submodule = submodule_from_path(&null_oid, ce->name);
1192 if (!submodule)
1193 submodule = submodule_from_name(&null_oid, ce->name);
1194
1195 default_argv = "yes";
1196 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
1197 if (submodule &&
1198 submodule->fetch_recurse !=
1199 RECURSE_SUBMODULES_NONE) {
1200 if (submodule->fetch_recurse ==
1201 RECURSE_SUBMODULES_OFF)
1202 continue;
1203 if (submodule->fetch_recurse ==
1204 RECURSE_SUBMODULES_ON_DEMAND) {
1205 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1206 continue;
1207 default_argv = "on-demand";
1208 }
1209 } else {
1210 if (spf->default_option == RECURSE_SUBMODULES_OFF)
1211 continue;
1212 if (spf->default_option == RECURSE_SUBMODULES_ON_DEMAND) {
1213 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1214 continue;
1215 default_argv = "on-demand";
1216 }
1217 }
1218 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
1219 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1220 continue;
1221 default_argv = "on-demand";
1222 }
1223
1224 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
1225 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1226 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1227 git_dir = read_gitfile(submodule_git_dir.buf);
1228 if (!git_dir)
1229 git_dir = submodule_git_dir.buf;
1230 if (is_directory(git_dir)) {
1231 child_process_init(cp);
1232 cp->dir = strbuf_detach(&submodule_path, NULL);
1233 prepare_submodule_repo_env(&cp->env_array);
1234 cp->git_cmd = 1;
1235 if (!spf->quiet)
1236 strbuf_addf(err, "Fetching submodule %s%s\n",
1237 spf->prefix, ce->name);
1238 argv_array_init(&cp->args);
1239 argv_array_pushv(&cp->args, spf->args.argv);
1240 argv_array_push(&cp->args, default_argv);
1241 argv_array_push(&cp->args, "--submodule-prefix");
1242 argv_array_push(&cp->args, submodule_prefix.buf);
1243 ret = 1;
1244 }
1245 strbuf_release(&submodule_path);
1246 strbuf_release(&submodule_git_dir);
1247 strbuf_release(&submodule_prefix);
1248 if (ret) {
1249 spf->count++;
1250 return 1;
1251 }
1252 }
1253 return 0;
1254 }
1255
1256 static int fetch_start_failure(struct strbuf *err,
1257 void *cb, void *task_cb)
1258 {
1259 struct submodule_parallel_fetch *spf = cb;
1260
1261 spf->result = 1;
1262
1263 return 0;
1264 }
1265
1266 static int fetch_finish(int retvalue, struct strbuf *err,
1267 void *cb, void *task_cb)
1268 {
1269 struct submodule_parallel_fetch *spf = cb;
1270
1271 if (retvalue)
1272 spf->result = 1;
1273
1274 return 0;
1275 }
1276
1277 int fetch_populated_submodules(const struct argv_array *options,
1278 const char *prefix, int command_line_option,
1279 int default_option,
1280 int quiet, int max_parallel_jobs)
1281 {
1282 int i;
1283 struct submodule_parallel_fetch spf = SPF_INIT;
1284
1285 spf.work_tree = get_git_work_tree();
1286 spf.command_line_option = command_line_option;
1287 spf.default_option = default_option;
1288 spf.quiet = quiet;
1289 spf.prefix = prefix;
1290
1291 if (!spf.work_tree)
1292 goto out;
1293
1294 if (read_cache() < 0)
1295 die("index file corrupt");
1296
1297 argv_array_push(&spf.args, "fetch");
1298 for (i = 0; i < options->argc; i++)
1299 argv_array_push(&spf.args, options->argv[i]);
1300 argv_array_push(&spf.args, "--recurse-submodules-default");
1301 /* default value, "--submodule-prefix" and its value are added later */
1302
1303 calculate_changed_submodule_paths();
1304 run_processes_parallel(max_parallel_jobs,
1305 get_next_submodule,
1306 fetch_start_failure,
1307 fetch_finish,
1308 &spf);
1309
1310 argv_array_clear(&spf.args);
1311 out:
1312 string_list_clear(&changed_submodule_paths, 1);
1313 return spf.result;
1314 }
1315
1316 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1317 {
1318 struct child_process cp = CHILD_PROCESS_INIT;
1319 struct strbuf buf = STRBUF_INIT;
1320 FILE *fp;
1321 unsigned dirty_submodule = 0;
1322 const char *git_dir;
1323 int ignore_cp_exit_code = 0;
1324
1325 strbuf_addf(&buf, "%s/.git", path);
1326 git_dir = read_gitfile(buf.buf);
1327 if (!git_dir)
1328 git_dir = buf.buf;
1329 if (!is_git_directory(git_dir)) {
1330 if (is_directory(git_dir))
1331 die(_("'%s' not recognized as a git repository"), git_dir);
1332 strbuf_release(&buf);
1333 /* The submodule is not checked out, so it is not modified */
1334 return 0;
1335 }
1336 strbuf_reset(&buf);
1337
1338 argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1339 if (ignore_untracked)
1340 argv_array_push(&cp.args, "-uno");
1341
1342 prepare_submodule_repo_env(&cp.env_array);
1343 cp.git_cmd = 1;
1344 cp.no_stdin = 1;
1345 cp.out = -1;
1346 cp.dir = path;
1347 if (start_command(&cp))
1348 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1349
1350 fp = xfdopen(cp.out, "r");
1351 while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1352 /* regular untracked files */
1353 if (buf.buf[0] == '?')
1354 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1355
1356 if (buf.buf[0] == 'u' ||
1357 buf.buf[0] == '1' ||
1358 buf.buf[0] == '2') {
1359 /* T = line type, XY = status, SSSS = submodule state */
1360 if (buf.len < strlen("T XY SSSS"))
1361 die("BUG: invalid status --porcelain=2 line %s",
1362 buf.buf);
1363
1364 if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1365 /* nested untracked file */
1366 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1367
1368 if (buf.buf[0] == 'u' ||
1369 buf.buf[0] == '2' ||
1370 memcmp(buf.buf + 5, "S..U", 4))
1371 /* other change */
1372 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1373 }
1374
1375 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1376 ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1377 ignore_untracked)) {
1378 /*
1379 * We're not interested in any further information from
1380 * the child any more, neither output nor its exit code.
1381 */
1382 ignore_cp_exit_code = 1;
1383 break;
1384 }
1385 }
1386 fclose(fp);
1387
1388 if (finish_command(&cp) && !ignore_cp_exit_code)
1389 die("'git status --porcelain=2' failed in submodule %s", path);
1390
1391 strbuf_release(&buf);
1392 return dirty_submodule;
1393 }
1394
1395 int submodule_uses_gitfile(const char *path)
1396 {
1397 struct child_process cp = CHILD_PROCESS_INIT;
1398 const char *argv[] = {
1399 "submodule",
1400 "foreach",
1401 "--quiet",
1402 "--recursive",
1403 "test -f .git",
1404 NULL,
1405 };
1406 struct strbuf buf = STRBUF_INIT;
1407 const char *git_dir;
1408
1409 strbuf_addf(&buf, "%s/.git", path);
1410 git_dir = read_gitfile(buf.buf);
1411 if (!git_dir) {
1412 strbuf_release(&buf);
1413 return 0;
1414 }
1415 strbuf_release(&buf);
1416
1417 /* Now test that all nested submodules use a gitfile too */
1418 cp.argv = argv;
1419 prepare_submodule_repo_env(&cp.env_array);
1420 cp.git_cmd = 1;
1421 cp.no_stdin = 1;
1422 cp.no_stderr = 1;
1423 cp.no_stdout = 1;
1424 cp.dir = path;
1425 if (run_command(&cp))
1426 return 0;
1427
1428 return 1;
1429 }
1430
1431 /*
1432 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1433 * when doing so.
1434 *
1435 * Return 1 if we'd lose data, return 0 if the removal is fine,
1436 * and negative values for errors.
1437 */
1438 int bad_to_remove_submodule(const char *path, unsigned flags)
1439 {
1440 ssize_t len;
1441 struct child_process cp = CHILD_PROCESS_INIT;
1442 struct strbuf buf = STRBUF_INIT;
1443 int ret = 0;
1444
1445 if (!file_exists(path) || is_empty_dir(path))
1446 return 0;
1447
1448 if (!submodule_uses_gitfile(path))
1449 return 1;
1450
1451 argv_array_pushl(&cp.args, "status", "--porcelain",
1452 "--ignore-submodules=none", NULL);
1453
1454 if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1455 argv_array_push(&cp.args, "-uno");
1456 else
1457 argv_array_push(&cp.args, "-uall");
1458
1459 if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1460 argv_array_push(&cp.args, "--ignored");
1461
1462 prepare_submodule_repo_env(&cp.env_array);
1463 cp.git_cmd = 1;
1464 cp.no_stdin = 1;
1465 cp.out = -1;
1466 cp.dir = path;
1467 if (start_command(&cp)) {
1468 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1469 die(_("could not start 'git status' in submodule '%s'"),
1470 path);
1471 ret = -1;
1472 goto out;
1473 }
1474
1475 len = strbuf_read(&buf, cp.out, 1024);
1476 if (len > 2)
1477 ret = 1;
1478 close(cp.out);
1479
1480 if (finish_command(&cp)) {
1481 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1482 die(_("could not run 'git status' in submodule '%s'"),
1483 path);
1484 ret = -1;
1485 }
1486 out:
1487 strbuf_release(&buf);
1488 return ret;
1489 }
1490
1491 static const char *get_super_prefix_or_empty(void)
1492 {
1493 const char *s = get_super_prefix();
1494 if (!s)
1495 s = "";
1496 return s;
1497 }
1498
1499 static int submodule_has_dirty_index(const struct submodule *sub)
1500 {
1501 struct child_process cp = CHILD_PROCESS_INIT;
1502
1503 prepare_submodule_repo_env(&cp.env_array);
1504
1505 cp.git_cmd = 1;
1506 argv_array_pushl(&cp.args, "diff-index", "--quiet",
1507 "--cached", "HEAD", NULL);
1508 cp.no_stdin = 1;
1509 cp.no_stdout = 1;
1510 cp.dir = sub->path;
1511 if (start_command(&cp))
1512 die("could not recurse into submodule '%s'", sub->path);
1513
1514 return finish_command(&cp);
1515 }
1516
1517 static void submodule_reset_index(const char *path)
1518 {
1519 struct child_process cp = CHILD_PROCESS_INIT;
1520 prepare_submodule_repo_env(&cp.env_array);
1521
1522 cp.git_cmd = 1;
1523 cp.no_stdin = 1;
1524 cp.dir = path;
1525
1526 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1527 get_super_prefix_or_empty(), path);
1528 argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1529
1530 argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1531
1532 if (run_command(&cp))
1533 die("could not reset submodule index");
1534 }
1535
1536 /**
1537 * Moves a submodule at a given path from a given head to another new head.
1538 * For edge cases (a submodule coming into existence or removing a submodule)
1539 * pass NULL for old or new respectively.
1540 */
1541 int submodule_move_head(const char *path,
1542 const char *old,
1543 const char *new,
1544 unsigned flags)
1545 {
1546 int ret = 0;
1547 struct child_process cp = CHILD_PROCESS_INIT;
1548 const struct submodule *sub;
1549 int *error_code_ptr, error_code;
1550
1551 if (!is_submodule_active(the_repository, path))
1552 return 0;
1553
1554 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1555 /*
1556 * Pass non NULL pointer to is_submodule_populated_gently
1557 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1558 * to fixup the submodule in the force case later.
1559 */
1560 error_code_ptr = &error_code;
1561 else
1562 error_code_ptr = NULL;
1563
1564 if (old && !is_submodule_populated_gently(path, error_code_ptr))
1565 return 0;
1566
1567 sub = submodule_from_path(&null_oid, path);
1568
1569 if (!sub)
1570 die("BUG: could not get submodule information for '%s'", path);
1571
1572 if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1573 /* Check if the submodule has a dirty index. */
1574 if (submodule_has_dirty_index(sub))
1575 return error(_("submodule '%s' has dirty index"), path);
1576 }
1577
1578 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1579 if (old) {
1580 if (!submodule_uses_gitfile(path))
1581 absorb_git_dir_into_superproject("", path,
1582 ABSORB_GITDIR_RECURSE_SUBMODULES);
1583 } else {
1584 char *gitdir = xstrfmt("%s/modules/%s",
1585 get_git_common_dir(), sub->name);
1586 connect_work_tree_and_git_dir(path, gitdir);
1587 free(gitdir);
1588
1589 /* make sure the index is clean as well */
1590 submodule_reset_index(path);
1591 }
1592
1593 if (old && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1594 char *gitdir = xstrfmt("%s/modules/%s",
1595 get_git_common_dir(), sub->name);
1596 connect_work_tree_and_git_dir(path, gitdir);
1597 free(gitdir);
1598 }
1599 }
1600
1601 prepare_submodule_repo_env(&cp.env_array);
1602
1603 cp.git_cmd = 1;
1604 cp.no_stdin = 1;
1605 cp.dir = path;
1606
1607 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1608 get_super_prefix_or_empty(), path);
1609 argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1610
1611 if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1612 argv_array_push(&cp.args, "-n");
1613 else
1614 argv_array_push(&cp.args, "-u");
1615
1616 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1617 argv_array_push(&cp.args, "--reset");
1618 else
1619 argv_array_push(&cp.args, "-m");
1620
1621 argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
1622 argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
1623
1624 if (run_command(&cp)) {
1625 ret = -1;
1626 goto out;
1627 }
1628
1629 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1630 if (new) {
1631 child_process_init(&cp);
1632 /* also set the HEAD accordingly */
1633 cp.git_cmd = 1;
1634 cp.no_stdin = 1;
1635 cp.dir = path;
1636
1637 prepare_submodule_repo_env(&cp.env_array);
1638 argv_array_pushl(&cp.args, "update-ref", "HEAD", new, NULL);
1639
1640 if (run_command(&cp)) {
1641 ret = -1;
1642 goto out;
1643 }
1644 } else {
1645 struct strbuf sb = STRBUF_INIT;
1646
1647 strbuf_addf(&sb, "%s/.git", path);
1648 unlink_or_warn(sb.buf);
1649 strbuf_release(&sb);
1650
1651 if (is_empty_dir(path))
1652 rmdir_or_warn(path);
1653 }
1654 }
1655 out:
1656 return ret;
1657 }
1658
1659 static int find_first_merges(struct object_array *result, const char *path,
1660 struct commit *a, struct commit *b)
1661 {
1662 int i, j;
1663 struct object_array merges = OBJECT_ARRAY_INIT;
1664 struct commit *commit;
1665 int contains_another;
1666
1667 char merged_revision[42];
1668 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1669 "--all", merged_revision, NULL };
1670 struct rev_info revs;
1671 struct setup_revision_opt rev_opts;
1672
1673 memset(result, 0, sizeof(struct object_array));
1674 memset(&rev_opts, 0, sizeof(rev_opts));
1675
1676 /* get all revisions that merge commit a */
1677 xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1678 oid_to_hex(&a->object.oid));
1679 init_revisions(&revs, NULL);
1680 rev_opts.submodule = path;
1681 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1682
1683 /* save all revisions from the above list that contain b */
1684 if (prepare_revision_walk(&revs))
1685 die("revision walk setup failed");
1686 while ((commit = get_revision(&revs)) != NULL) {
1687 struct object *o = &(commit->object);
1688 if (in_merge_bases(b, commit))
1689 add_object_array(o, NULL, &merges);
1690 }
1691 reset_revision_walk();
1692
1693 /* Now we've got all merges that contain a and b. Prune all
1694 * merges that contain another found merge and save them in
1695 * result.
1696 */
1697 for (i = 0; i < merges.nr; i++) {
1698 struct commit *m1 = (struct commit *) merges.objects[i].item;
1699
1700 contains_another = 0;
1701 for (j = 0; j < merges.nr; j++) {
1702 struct commit *m2 = (struct commit *) merges.objects[j].item;
1703 if (i != j && in_merge_bases(m2, m1)) {
1704 contains_another = 1;
1705 break;
1706 }
1707 }
1708
1709 if (!contains_another)
1710 add_object_array(merges.objects[i].item, NULL, result);
1711 }
1712
1713 free(merges.objects);
1714 return result->nr;
1715 }
1716
1717 static void print_commit(struct commit *commit)
1718 {
1719 struct strbuf sb = STRBUF_INIT;
1720 struct pretty_print_context ctx = {0};
1721 ctx.date_mode.type = DATE_NORMAL;
1722 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1723 fprintf(stderr, "%s\n", sb.buf);
1724 strbuf_release(&sb);
1725 }
1726
1727 #define MERGE_WARNING(path, msg) \
1728 warning("Failed to merge submodule %s (%s)", path, msg);
1729
1730 int merge_submodule(struct object_id *result, const char *path,
1731 const struct object_id *base, const struct object_id *a,
1732 const struct object_id *b, int search)
1733 {
1734 struct commit *commit_base, *commit_a, *commit_b;
1735 int parent_count;
1736 struct object_array merges;
1737
1738 int i;
1739
1740 /* store a in result in case we fail */
1741 oidcpy(result, a);
1742
1743 /* we can not handle deletion conflicts */
1744 if (is_null_oid(base))
1745 return 0;
1746 if (is_null_oid(a))
1747 return 0;
1748 if (is_null_oid(b))
1749 return 0;
1750
1751 if (add_submodule_odb(path)) {
1752 MERGE_WARNING(path, "not checked out");
1753 return 0;
1754 }
1755
1756 if (!(commit_base = lookup_commit_reference(base)) ||
1757 !(commit_a = lookup_commit_reference(a)) ||
1758 !(commit_b = lookup_commit_reference(b))) {
1759 MERGE_WARNING(path, "commits not present");
1760 return 0;
1761 }
1762
1763 /* check whether both changes are forward */
1764 if (!in_merge_bases(commit_base, commit_a) ||
1765 !in_merge_bases(commit_base, commit_b)) {
1766 MERGE_WARNING(path, "commits don't follow merge-base");
1767 return 0;
1768 }
1769
1770 /* Case #1: a is contained in b or vice versa */
1771 if (in_merge_bases(commit_a, commit_b)) {
1772 oidcpy(result, b);
1773 return 1;
1774 }
1775 if (in_merge_bases(commit_b, commit_a)) {
1776 oidcpy(result, a);
1777 return 1;
1778 }
1779
1780 /*
1781 * Case #2: There are one or more merges that contain a and b in
1782 * the submodule. If there is only one, then present it as a
1783 * suggestion to the user, but leave it marked unmerged so the
1784 * user needs to confirm the resolution.
1785 */
1786
1787 /* Skip the search if makes no sense to the calling context. */
1788 if (!search)
1789 return 0;
1790
1791 /* find commit which merges them */
1792 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1793 switch (parent_count) {
1794 case 0:
1795 MERGE_WARNING(path, "merge following commits not found");
1796 break;
1797
1798 case 1:
1799 MERGE_WARNING(path, "not fast-forward");
1800 fprintf(stderr, "Found a possible merge resolution "
1801 "for the submodule:\n");
1802 print_commit((struct commit *) merges.objects[0].item);
1803 fprintf(stderr,
1804 "If this is correct simply add it to the index "
1805 "for example\n"
1806 "by using:\n\n"
1807 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1808 "which will accept this suggestion.\n",
1809 oid_to_hex(&merges.objects[0].item->oid), path);
1810 break;
1811
1812 default:
1813 MERGE_WARNING(path, "multiple merges found");
1814 for (i = 0; i < merges.nr; i++)
1815 print_commit((struct commit *) merges.objects[i].item);
1816 }
1817
1818 free(merges.objects);
1819 return 0;
1820 }
1821
1822 /*
1823 * Embeds a single submodules git directory into the superprojects git dir,
1824 * non recursively.
1825 */
1826 static void relocate_single_git_dir_into_superproject(const char *prefix,
1827 const char *path)
1828 {
1829 char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1830 const char *new_git_dir;
1831 const struct submodule *sub;
1832
1833 if (submodule_uses_worktrees(path))
1834 die(_("relocate_gitdir for submodule '%s' with "
1835 "more than one worktree not supported"), path);
1836
1837 old_git_dir = xstrfmt("%s/.git", path);
1838 if (read_gitfile(old_git_dir))
1839 /* If it is an actual gitfile, it doesn't need migration. */
1840 return;
1841
1842 real_old_git_dir = real_pathdup(old_git_dir, 1);
1843
1844 sub = submodule_from_path(&null_oid, path);
1845 if (!sub)
1846 die(_("could not lookup name for submodule '%s'"), path);
1847
1848 new_git_dir = git_path("modules/%s", sub->name);
1849 if (safe_create_leading_directories_const(new_git_dir) < 0)
1850 die(_("could not create directory '%s'"), new_git_dir);
1851 real_new_git_dir = real_pathdup(new_git_dir, 1);
1852
1853 fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1854 get_super_prefix_or_empty(), path,
1855 real_old_git_dir, real_new_git_dir);
1856
1857 relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1858
1859 free(old_git_dir);
1860 free(real_old_git_dir);
1861 free(real_new_git_dir);
1862 }
1863
1864 /*
1865 * Migrate the git directory of the submodule given by path from
1866 * having its git directory within the working tree to the git dir nested
1867 * in its superprojects git dir under modules/.
1868 */
1869 void absorb_git_dir_into_superproject(const char *prefix,
1870 const char *path,
1871 unsigned flags)
1872 {
1873 int err_code;
1874 const char *sub_git_dir;
1875 struct strbuf gitdir = STRBUF_INIT;
1876 strbuf_addf(&gitdir, "%s/.git", path);
1877 sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1878
1879 /* Not populated? */
1880 if (!sub_git_dir) {
1881 const struct submodule *sub;
1882
1883 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1884 /* unpopulated as expected */
1885 strbuf_release(&gitdir);
1886 return;
1887 }
1888
1889 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1890 /* We don't know what broke here. */
1891 read_gitfile_error_die(err_code, path, NULL);
1892
1893 /*
1894 * Maybe populated, but no git directory was found?
1895 * This can happen if the superproject is a submodule
1896 * itself and was just absorbed. The absorption of the
1897 * superproject did not rewrite the git file links yet,
1898 * fix it now.
1899 */
1900 sub = submodule_from_path(&null_oid, path);
1901 if (!sub)
1902 die(_("could not lookup name for submodule '%s'"), path);
1903 connect_work_tree_and_git_dir(path,
1904 git_path("modules/%s", sub->name));
1905 } else {
1906 /* Is it already absorbed into the superprojects git dir? */
1907 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1908 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1909
1910 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1911 relocate_single_git_dir_into_superproject(prefix, path);
1912
1913 free(real_sub_git_dir);
1914 free(real_common_git_dir);
1915 }
1916 strbuf_release(&gitdir);
1917
1918 if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1919 struct child_process cp = CHILD_PROCESS_INIT;
1920 struct strbuf sb = STRBUF_INIT;
1921
1922 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1923 die("BUG: we don't know how to pass the flags down?");
1924
1925 strbuf_addstr(&sb, get_super_prefix_or_empty());
1926 strbuf_addstr(&sb, path);
1927 strbuf_addch(&sb, '/');
1928
1929 cp.dir = path;
1930 cp.git_cmd = 1;
1931 cp.no_stdin = 1;
1932 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1933 "submodule--helper",
1934 "absorb-git-dirs", NULL);
1935 prepare_submodule_repo_env(&cp.env_array);
1936 if (run_command(&cp))
1937 die(_("could not recurse into submodule '%s'"), path);
1938
1939 strbuf_release(&sb);
1940 }
1941 }
1942
1943 const char *get_superproject_working_tree(void)
1944 {
1945 struct child_process cp = CHILD_PROCESS_INIT;
1946 struct strbuf sb = STRBUF_INIT;
1947 const char *one_up = real_path_if_valid("../");
1948 const char *cwd = xgetcwd();
1949 const char *ret = NULL;
1950 const char *subpath;
1951 int code;
1952 ssize_t len;
1953
1954 if (!is_inside_work_tree())
1955 /*
1956 * FIXME:
1957 * We might have a superproject, but it is harder
1958 * to determine.
1959 */
1960 return NULL;
1961
1962 if (!one_up)
1963 return NULL;
1964
1965 subpath = relative_path(cwd, one_up, &sb);
1966
1967 prepare_submodule_repo_env(&cp.env_array);
1968 argv_array_pop(&cp.env_array);
1969
1970 argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
1971 "ls-files", "-z", "--stage", "--full-name", "--",
1972 subpath, NULL);
1973 strbuf_reset(&sb);
1974
1975 cp.no_stdin = 1;
1976 cp.no_stderr = 1;
1977 cp.out = -1;
1978 cp.git_cmd = 1;
1979
1980 if (start_command(&cp))
1981 die(_("could not start ls-files in .."));
1982
1983 len = strbuf_read(&sb, cp.out, PATH_MAX);
1984 close(cp.out);
1985
1986 if (starts_with(sb.buf, "160000")) {
1987 int super_sub_len;
1988 int cwd_len = strlen(cwd);
1989 char *super_sub, *super_wt;
1990
1991 /*
1992 * There is a superproject having this repo as a submodule.
1993 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
1994 * We're only interested in the name after the tab.
1995 */
1996 super_sub = strchr(sb.buf, '\t') + 1;
1997 super_sub_len = sb.buf + sb.len - super_sub - 1;
1998
1999 if (super_sub_len > cwd_len ||
2000 strcmp(&cwd[cwd_len - super_sub_len], super_sub))
2001 die (_("BUG: returned path string doesn't match cwd?"));
2002
2003 super_wt = xstrdup(cwd);
2004 super_wt[cwd_len - super_sub_len] = '\0';
2005
2006 ret = real_path(super_wt);
2007 free(super_wt);
2008 }
2009 strbuf_release(&sb);
2010
2011 code = finish_command(&cp);
2012
2013 if (code == 128)
2014 /* '../' is not a git repository */
2015 return NULL;
2016 if (code == 0 && len == 0)
2017 /* There is an unrelated git repository at '../' */
2018 return NULL;
2019 if (code)
2020 die(_("ls-tree returned unexpected return code %d"), code);
2021
2022 return ret;
2023 }
2024
2025 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
2026 {
2027 const struct submodule *sub;
2028 const char *git_dir;
2029 int ret = 0;
2030
2031 strbuf_reset(buf);
2032 strbuf_addstr(buf, submodule);
2033 strbuf_complete(buf, '/');
2034 strbuf_addstr(buf, ".git");
2035
2036 git_dir = read_gitfile(buf->buf);
2037 if (git_dir) {
2038 strbuf_reset(buf);
2039 strbuf_addstr(buf, git_dir);
2040 }
2041 if (!is_git_directory(buf->buf)) {
2042 gitmodules_config();
2043 sub = submodule_from_path(&null_oid, submodule);
2044 if (!sub) {
2045 ret = -1;
2046 goto cleanup;
2047 }
2048 strbuf_reset(buf);
2049 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
2050 }
2051
2052 cleanup:
2053 return ret;
2054 }