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Merge branch 'db/doc-workflows-neuter-the-maintainer'
[git/debian.git] / submodule.c
blobfa25888783aa9ba7ce5b290ba64ec3c1b7a87cec
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_names = 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, CE_MATCH_IGNORE_FSMONITOR) & DATA_CHANGED)
66 return 0;
67 }
68
69 return 1;
70 }
71
72 static int for_each_remote_ref_submodule(const char *submodule,
73 each_ref_fn fn, void *cb_data)
74 {
75 return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
76 fn, cb_data);
77 }
78
79 /*
80 * Try to update the "path" entry in the "submodule.<name>" section of the
81 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
82 * with the correct path=<oldpath> setting was found and we could update it.
83 */
84 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
85 {
86 struct strbuf entry = STRBUF_INIT;
87 const struct submodule *submodule;
88
89 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
90 return -1;
91
92 if (is_gitmodules_unmerged(&the_index))
93 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
94
95 submodule = submodule_from_path(&null_oid, oldpath);
96 if (!submodule || !submodule->name) {
97 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
98 return -1;
99 }
100 strbuf_addstr(&entry, "submodule.");
101 strbuf_addstr(&entry, submodule->name);
102 strbuf_addstr(&entry, ".path");
103 if (git_config_set_in_file_gently(GITMODULES_FILE, entry.buf, newpath) < 0) {
104 /* Maybe the user already did that, don't error out here */
105 warning(_("Could not update .gitmodules entry %s"), entry.buf);
106 strbuf_release(&entry);
107 return -1;
108 }
109 strbuf_release(&entry);
110 return 0;
111 }
112
113 /*
114 * Try to remove the "submodule.<name>" section from .gitmodules where the given
115 * path is configured. Return 0 only if a .gitmodules file was found, a section
116 * with the correct path=<path> setting was found and we could remove it.
117 */
118 int remove_path_from_gitmodules(const char *path)
119 {
120 struct strbuf sect = STRBUF_INIT;
121 const struct submodule *submodule;
122
123 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
124 return -1;
125
126 if (is_gitmodules_unmerged(&the_index))
127 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
128
129 submodule = submodule_from_path(&null_oid, path);
130 if (!submodule || !submodule->name) {
131 warning(_("Could not find section in .gitmodules where path=%s"), path);
132 return -1;
133 }
134 strbuf_addstr(&sect, "submodule.");
135 strbuf_addstr(&sect, submodule->name);
136 if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
137 /* Maybe the user already did that, don't error out here */
138 warning(_("Could not remove .gitmodules entry for %s"), path);
139 strbuf_release(&sect);
140 return -1;
141 }
142 strbuf_release(&sect);
143 return 0;
144 }
145
146 void stage_updated_gitmodules(void)
147 {
148 if (add_file_to_cache(GITMODULES_FILE, 0))
149 die(_("staging updated .gitmodules failed"));
150 }
151
152 static int add_submodule_odb(const char *path)
153 {
154 struct strbuf objects_directory = STRBUF_INIT;
155 int ret = 0;
156
157 ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
158 if (ret)
159 goto done;
160 if (!is_directory(objects_directory.buf)) {
161 ret = -1;
162 goto done;
163 }
164 add_to_alternates_memory(objects_directory.buf);
165 done:
166 strbuf_release(&objects_directory);
167 return ret;
168 }
169
170 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
171 const char *path)
172 {
173 const struct submodule *submodule = submodule_from_path(&null_oid, path);
174 if (submodule) {
175 const char *ignore;
176 char *key;
177
178 key = xstrfmt("submodule.%s.ignore", submodule->name);
179 if (repo_config_get_string_const(the_repository, key, &ignore))
180 ignore = submodule->ignore;
181 free(key);
182
183 if (ignore)
184 handle_ignore_submodules_arg(diffopt, ignore);
185 else if (is_gitmodules_unmerged(&the_index))
186 diffopt->flags.ignore_submodules = 1;
187 }
188 }
189
190 /* Cheap function that only determines if we're interested in submodules at all */
191 int git_default_submodule_config(const char *var, const char *value, void *cb)
192 {
193 if (!strcmp(var, "submodule.recurse")) {
194 int v = git_config_bool(var, value) ?
195 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
196 config_update_recurse_submodules = v;
197 }
198 return 0;
199 }
200
201 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
202 const char *arg, int unset)
203 {
204 if (unset) {
205 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
206 return 0;
207 }
208 if (arg)
209 config_update_recurse_submodules =
210 parse_update_recurse_submodules_arg(opt->long_name,
211 arg);
212 else
213 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
214
215 return 0;
216 }
217
218 /*
219 * Determine if a submodule has been initialized at a given 'path'
220 */
221 int is_submodule_active(struct repository *repo, const char *path)
222 {
223 int ret = 0;
224 char *key = NULL;
225 char *value = NULL;
226 const struct string_list *sl;
227 const struct submodule *module;
228
229 module = submodule_from_cache(repo, &null_oid, path);
230
231 /* early return if there isn't a path->module mapping */
232 if (!module)
233 return 0;
234
235 /* submodule.<name>.active is set */
236 key = xstrfmt("submodule.%s.active", module->name);
237 if (!repo_config_get_bool(repo, key, &ret)) {
238 free(key);
239 return ret;
240 }
241 free(key);
242
243 /* submodule.active is set */
244 sl = repo_config_get_value_multi(repo, "submodule.active");
245 if (sl) {
246 struct pathspec ps;
247 struct argv_array args = ARGV_ARRAY_INIT;
248 const struct string_list_item *item;
249
250 for_each_string_list_item(item, sl) {
251 argv_array_push(&args, item->string);
252 }
253
254 parse_pathspec(&ps, 0, 0, NULL, args.argv);
255 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
256
257 argv_array_clear(&args);
258 clear_pathspec(&ps);
259 return ret;
260 }
261
262 /* fallback to checking if the URL is set */
263 key = xstrfmt("submodule.%s.url", module->name);
264 ret = !repo_config_get_string(repo, key, &value);
265
266 free(value);
267 free(key);
268 return ret;
269 }
270
271 int is_submodule_populated_gently(const char *path, int *return_error_code)
272 {
273 int ret = 0;
274 char *gitdir = xstrfmt("%s/.git", path);
275
276 if (resolve_gitdir_gently(gitdir, return_error_code))
277 ret = 1;
278
279 free(gitdir);
280 return ret;
281 }
282
283 /*
284 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
285 */
286 void die_in_unpopulated_submodule(const struct index_state *istate,
287 const char *prefix)
288 {
289 int i, prefixlen;
290
291 if (!prefix)
292 return;
293
294 prefixlen = strlen(prefix);
295
296 for (i = 0; i < istate->cache_nr; i++) {
297 struct cache_entry *ce = istate->cache[i];
298 int ce_len = ce_namelen(ce);
299
300 if (!S_ISGITLINK(ce->ce_mode))
301 continue;
302 if (prefixlen <= ce_len)
303 continue;
304 if (strncmp(ce->name, prefix, ce_len))
305 continue;
306 if (prefix[ce_len] != '/')
307 continue;
308
309 die(_("in unpopulated submodule '%s'"), ce->name);
310 }
311 }
312
313 /*
314 * Dies if any paths in the provided pathspec descends into a submodule
315 */
316 void die_path_inside_submodule(const struct index_state *istate,
317 const struct pathspec *ps)
318 {
319 int i, j;
320
321 for (i = 0; i < istate->cache_nr; i++) {
322 struct cache_entry *ce = istate->cache[i];
323 int ce_len = ce_namelen(ce);
324
325 if (!S_ISGITLINK(ce->ce_mode))
326 continue;
327
328 for (j = 0; j < ps->nr ; j++) {
329 const struct pathspec_item *item = &ps->items[j];
330
331 if (item->len <= ce_len)
332 continue;
333 if (item->match[ce_len] != '/')
334 continue;
335 if (strncmp(ce->name, item->match, ce_len))
336 continue;
337 if (item->len == ce_len + 1)
338 continue;
339
340 die(_("Pathspec '%s' is in submodule '%.*s'"),
341 item->original, ce_len, ce->name);
342 }
343 }
344 }
345
346 enum submodule_update_type parse_submodule_update_type(const char *value)
347 {
348 if (!strcmp(value, "none"))
349 return SM_UPDATE_NONE;
350 else if (!strcmp(value, "checkout"))
351 return SM_UPDATE_CHECKOUT;
352 else if (!strcmp(value, "rebase"))
353 return SM_UPDATE_REBASE;
354 else if (!strcmp(value, "merge"))
355 return SM_UPDATE_MERGE;
356 else if (*value == '!')
357 return SM_UPDATE_COMMAND;
358 else
359 return SM_UPDATE_UNSPECIFIED;
360 }
361
362 int parse_submodule_update_strategy(const char *value,
363 struct submodule_update_strategy *dst)
364 {
365 enum submodule_update_type type;
366
367 free((void*)dst->command);
368 dst->command = NULL;
369
370 type = parse_submodule_update_type(value);
371 if (type == SM_UPDATE_UNSPECIFIED)
372 return -1;
373
374 dst->type = type;
375 if (type == SM_UPDATE_COMMAND)
376 dst->command = xstrdup(value + 1);
377
378 return 0;
379 }
380
381 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
382 {
383 struct strbuf sb = STRBUF_INIT;
384 switch (s->type) {
385 case SM_UPDATE_CHECKOUT:
386 return "checkout";
387 case SM_UPDATE_MERGE:
388 return "merge";
389 case SM_UPDATE_REBASE:
390 return "rebase";
391 case SM_UPDATE_NONE:
392 return "none";
393 case SM_UPDATE_UNSPECIFIED:
394 return NULL;
395 case SM_UPDATE_COMMAND:
396 strbuf_addf(&sb, "!%s", s->command);
397 return strbuf_detach(&sb, NULL);
398 }
399 return NULL;
400 }
401
402 void handle_ignore_submodules_arg(struct diff_options *diffopt,
403 const char *arg)
404 {
405 diffopt->flags.ignore_submodules = 0;
406 diffopt->flags.ignore_untracked_in_submodules = 0;
407 diffopt->flags.ignore_dirty_submodules = 0;
408
409 if (!strcmp(arg, "all"))
410 diffopt->flags.ignore_submodules = 1;
411 else if (!strcmp(arg, "untracked"))
412 diffopt->flags.ignore_untracked_in_submodules = 1;
413 else if (!strcmp(arg, "dirty"))
414 diffopt->flags.ignore_dirty_submodules = 1;
415 else if (strcmp(arg, "none"))
416 die("bad --ignore-submodules argument: %s", arg);
417 }
418
419 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
420 struct commit *left, struct commit *right,
421 struct commit_list *merge_bases)
422 {
423 struct commit_list *list;
424
425 init_revisions(rev, NULL);
426 setup_revisions(0, NULL, rev, NULL);
427 rev->left_right = 1;
428 rev->first_parent_only = 1;
429 left->object.flags |= SYMMETRIC_LEFT;
430 add_pending_object(rev, &left->object, path);
431 add_pending_object(rev, &right->object, path);
432 for (list = merge_bases; list; list = list->next) {
433 list->item->object.flags |= UNINTERESTING;
434 add_pending_object(rev, &list->item->object,
435 oid_to_hex(&list->item->object.oid));
436 }
437 return prepare_revision_walk(rev);
438 }
439
440 static void print_submodule_summary(struct rev_info *rev, struct diff_options *o)
441 {
442 static const char format[] = " %m %s";
443 struct strbuf sb = STRBUF_INIT;
444 struct commit *commit;
445
446 while ((commit = get_revision(rev))) {
447 struct pretty_print_context ctx = {0};
448 ctx.date_mode = rev->date_mode;
449 ctx.output_encoding = get_log_output_encoding();
450 strbuf_setlen(&sb, 0);
451 format_commit_message(commit, format, &sb, &ctx);
452 strbuf_addch(&sb, '\n');
453 if (commit->object.flags & SYMMETRIC_LEFT)
454 diff_emit_submodule_del(o, sb.buf);
455 else
456 diff_emit_submodule_add(o, sb.buf);
457 }
458 strbuf_release(&sb);
459 }
460
461 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
462 {
463 const char * const *var;
464
465 for (var = local_repo_env; *var; var++) {
466 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
467 argv_array_push(out, *var);
468 }
469 }
470
471 void prepare_submodule_repo_env(struct argv_array *out)
472 {
473 prepare_submodule_repo_env_no_git_dir(out);
474 argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
475 DEFAULT_GIT_DIR_ENVIRONMENT);
476 }
477
478 /* Helper function to display the submodule header line prior to the full
479 * summary output. If it can locate the submodule objects directory it will
480 * attempt to lookup both the left and right commits and put them into the
481 * left and right pointers.
482 */
483 static void show_submodule_header(struct diff_options *o, const char *path,
484 struct object_id *one, struct object_id *two,
485 unsigned dirty_submodule,
486 struct commit **left, struct commit **right,
487 struct commit_list **merge_bases)
488 {
489 const char *message = NULL;
490 struct strbuf sb = STRBUF_INIT;
491 int fast_forward = 0, fast_backward = 0;
492
493 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
494 diff_emit_submodule_untracked(o, path);
495
496 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
497 diff_emit_submodule_modified(o, path);
498
499 if (is_null_oid(one))
500 message = "(new submodule)";
501 else if (is_null_oid(two))
502 message = "(submodule deleted)";
503
504 if (add_submodule_odb(path)) {
505 if (!message)
506 message = "(commits not present)";
507 goto output_header;
508 }
509
510 /*
511 * Attempt to lookup the commit references, and determine if this is
512 * a fast forward or fast backwards update.
513 */
514 *left = lookup_commit_reference(one);
515 *right = lookup_commit_reference(two);
516
517 /*
518 * Warn about missing commits in the submodule project, but only if
519 * they aren't null.
520 */
521 if ((!is_null_oid(one) && !*left) ||
522 (!is_null_oid(two) && !*right))
523 message = "(commits not present)";
524
525 *merge_bases = get_merge_bases(*left, *right);
526 if (*merge_bases) {
527 if ((*merge_bases)->item == *left)
528 fast_forward = 1;
529 else if ((*merge_bases)->item == *right)
530 fast_backward = 1;
531 }
532
533 if (!oidcmp(one, two)) {
534 strbuf_release(&sb);
535 return;
536 }
537
538 output_header:
539 strbuf_addf(&sb, "Submodule %s ", path);
540 strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
541 strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
542 strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
543 if (message)
544 strbuf_addf(&sb, " %s\n", message);
545 else
546 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
547 diff_emit_submodule_header(o, sb.buf);
548
549 strbuf_release(&sb);
550 }
551
552 void show_submodule_summary(struct diff_options *o, const char *path,
553 struct object_id *one, struct object_id *two,
554 unsigned dirty_submodule)
555 {
556 struct rev_info rev;
557 struct commit *left = NULL, *right = NULL;
558 struct commit_list *merge_bases = NULL;
559
560 show_submodule_header(o, path, one, two, dirty_submodule,
561 &left, &right, &merge_bases);
562
563 /*
564 * If we don't have both a left and a right pointer, there is no
565 * reason to try and display a summary. The header line should contain
566 * all the information the user needs.
567 */
568 if (!left || !right)
569 goto out;
570
571 /* Treat revision walker failure the same as missing commits */
572 if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
573 diff_emit_submodule_error(o, "(revision walker failed)\n");
574 goto out;
575 }
576
577 print_submodule_summary(&rev, o);
578
579 out:
580 if (merge_bases)
581 free_commit_list(merge_bases);
582 clear_commit_marks(left, ~0);
583 clear_commit_marks(right, ~0);
584 }
585
586 void show_submodule_inline_diff(struct diff_options *o, const char *path,
587 struct object_id *one, struct object_id *two,
588 unsigned dirty_submodule)
589 {
590 const struct object_id *old = the_hash_algo->empty_tree, *new = the_hash_algo->empty_tree;
591 struct commit *left = NULL, *right = NULL;
592 struct commit_list *merge_bases = NULL;
593 struct child_process cp = CHILD_PROCESS_INIT;
594 struct strbuf sb = STRBUF_INIT;
595
596 show_submodule_header(o, path, one, two, dirty_submodule,
597 &left, &right, &merge_bases);
598
599 /* We need a valid left and right commit to display a difference */
600 if (!(left || is_null_oid(one)) ||
601 !(right || is_null_oid(two)))
602 goto done;
603
604 if (left)
605 old = one;
606 if (right)
607 new = two;
608
609 cp.git_cmd = 1;
610 cp.dir = path;
611 cp.out = -1;
612 cp.no_stdin = 1;
613
614 /* TODO: other options may need to be passed here. */
615 argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
616 argv_array_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
617 "always" : "never");
618
619 if (o->flags.reverse_diff) {
620 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
621 o->b_prefix, path);
622 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
623 o->a_prefix, path);
624 } else {
625 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
626 o->a_prefix, path);
627 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
628 o->b_prefix, path);
629 }
630 argv_array_push(&cp.args, oid_to_hex(old));
631 /*
632 * If the submodule has modified content, we will diff against the
633 * work tree, under the assumption that the user has asked for the
634 * diff format and wishes to actually see all differences even if they
635 * haven't yet been committed to the submodule yet.
636 */
637 if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
638 argv_array_push(&cp.args, oid_to_hex(new));
639
640 prepare_submodule_repo_env(&cp.env_array);
641 if (start_command(&cp))
642 diff_emit_submodule_error(o, "(diff failed)\n");
643
644 while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
645 diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
646
647 if (finish_command(&cp))
648 diff_emit_submodule_error(o, "(diff failed)\n");
649
650 done:
651 strbuf_release(&sb);
652 if (merge_bases)
653 free_commit_list(merge_bases);
654 if (left)
655 clear_commit_marks(left, ~0);
656 if (right)
657 clear_commit_marks(right, ~0);
658 }
659
660 int should_update_submodules(void)
661 {
662 return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
663 }
664
665 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
666 {
667 if (!S_ISGITLINK(ce->ce_mode))
668 return NULL;
669
670 if (!should_update_submodules())
671 return NULL;
672
673 return submodule_from_path(&null_oid, ce->name);
674 }
675
676 static struct oid_array *submodule_commits(struct string_list *submodules,
677 const char *name)
678 {
679 struct string_list_item *item;
680
681 item = string_list_insert(submodules, name);
682 if (item->util)
683 return (struct oid_array *) item->util;
684
685 /* NEEDSWORK: should we have oid_array_init()? */
686 item->util = xcalloc(1, sizeof(struct oid_array));
687 return (struct oid_array *) item->util;
688 }
689
690 struct collect_changed_submodules_cb_data {
691 struct string_list *changed;
692 const struct object_id *commit_oid;
693 };
694
695 /*
696 * this would normally be two functions: default_name_from_path() and
697 * path_from_default_name(). Since the default name is the same as
698 * the submodule path we can get away with just one function which only
699 * checks whether there is a submodule in the working directory at that
700 * location.
701 */
702 static const char *default_name_or_path(const char *path_or_name)
703 {
704 int error_code;
705
706 if (!is_submodule_populated_gently(path_or_name, &error_code))
707 return NULL;
708
709 return path_or_name;
710 }
711
712 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
713 struct diff_options *options,
714 void *data)
715 {
716 struct collect_changed_submodules_cb_data *me = data;
717 struct string_list *changed = me->changed;
718 const struct object_id *commit_oid = me->commit_oid;
719 int i;
720
721 for (i = 0; i < q->nr; i++) {
722 struct diff_filepair *p = q->queue[i];
723 struct oid_array *commits;
724 const struct submodule *submodule;
725 const char *name;
726
727 if (!S_ISGITLINK(p->two->mode))
728 continue;
729
730 submodule = submodule_from_path(commit_oid, p->two->path);
731 if (submodule)
732 name = submodule->name;
733 else {
734 name = default_name_or_path(p->two->path);
735 /* make sure name does not collide with existing one */
736 submodule = submodule_from_name(commit_oid, name);
737 if (submodule) {
738 warning("Submodule in commit %s at path: "
739 "'%s' collides with a submodule named "
740 "the same. Skipping it.",
741 oid_to_hex(commit_oid), name);
742 name = NULL;
743 }
744 }
745
746 if (!name)
747 continue;
748
749 commits = submodule_commits(changed, name);
750 oid_array_append(commits, &p->two->oid);
751 }
752 }
753
754 /*
755 * Collect the paths of submodules in 'changed' which have changed based on
756 * the revisions as specified in 'argv'. Each entry in 'changed' will also
757 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
758 * what the submodule pointers were updated to during the change.
759 */
760 static void collect_changed_submodules(struct string_list *changed,
761 struct argv_array *argv)
762 {
763 struct rev_info rev;
764 const struct commit *commit;
765
766 init_revisions(&rev, NULL);
767 setup_revisions(argv->argc, argv->argv, &rev, NULL);
768 if (prepare_revision_walk(&rev))
769 die("revision walk setup failed");
770
771 while ((commit = get_revision(&rev))) {
772 struct rev_info diff_rev;
773 struct collect_changed_submodules_cb_data data;
774 data.changed = changed;
775 data.commit_oid = &commit->object.oid;
776
777 init_revisions(&diff_rev, NULL);
778 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
779 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
780 diff_rev.diffopt.format_callback_data = &data;
781 diff_tree_combined_merge(commit, 1, &diff_rev);
782 }
783
784 reset_revision_walk();
785 }
786
787 static void free_submodules_oids(struct string_list *submodules)
788 {
789 struct string_list_item *item;
790 for_each_string_list_item(item, submodules)
791 oid_array_clear((struct oid_array *) item->util);
792 string_list_clear(submodules, 1);
793 }
794
795 static int has_remote(const char *refname, const struct object_id *oid,
796 int flags, void *cb_data)
797 {
798 return 1;
799 }
800
801 static int append_oid_to_argv(const struct object_id *oid, void *data)
802 {
803 struct argv_array *argv = data;
804 argv_array_push(argv, oid_to_hex(oid));
805 return 0;
806 }
807
808 struct has_commit_data {
809 int result;
810 const char *path;
811 };
812
813 static int check_has_commit(const struct object_id *oid, void *data)
814 {
815 struct has_commit_data *cb = data;
816
817 enum object_type type = sha1_object_info(oid->hash, NULL);
818
819 switch (type) {
820 case OBJ_COMMIT:
821 return 0;
822 case OBJ_BAD:
823 /*
824 * Object is missing or invalid. If invalid, an error message
825 * has already been printed.
826 */
827 cb->result = 0;
828 return 0;
829 default:
830 die(_("submodule entry '%s' (%s) is a %s, not a commit"),
831 cb->path, oid_to_hex(oid), typename(type));
832 }
833 }
834
835 static int submodule_has_commits(const char *path, struct oid_array *commits)
836 {
837 struct has_commit_data has_commit = { 1, path };
838
839 /*
840 * Perform a cheap, but incorrect check for the existence of 'commits'.
841 * This is done by adding the submodule's object store to the in-core
842 * object store, and then querying for each commit's existence. If we
843 * do not have the commit object anywhere, there is no chance we have
844 * it in the object store of the correct submodule and have it
845 * reachable from a ref, so we can fail early without spawning rev-list
846 * which is expensive.
847 */
848 if (add_submodule_odb(path))
849 return 0;
850
851 oid_array_for_each_unique(commits, check_has_commit, &has_commit);
852
853 if (has_commit.result) {
854 /*
855 * Even if the submodule is checked out and the commit is
856 * present, make sure it exists in the submodule's object store
857 * and that it is reachable from a ref.
858 */
859 struct child_process cp = CHILD_PROCESS_INIT;
860 struct strbuf out = STRBUF_INIT;
861
862 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
863 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
864 argv_array_pushl(&cp.args, "--not", "--all", NULL);
865
866 prepare_submodule_repo_env(&cp.env_array);
867 cp.git_cmd = 1;
868 cp.no_stdin = 1;
869 cp.dir = path;
870
871 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
872 has_commit.result = 0;
873
874 strbuf_release(&out);
875 }
876
877 return has_commit.result;
878 }
879
880 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
881 {
882 if (!submodule_has_commits(path, commits))
883 /*
884 * NOTE: We do consider it safe to return "no" here. The
885 * correct answer would be "We do not know" instead of
886 * "No push needed", but it is quite hard to change
887 * the submodule pointer without having the submodule
888 * around. If a user did however change the submodules
889 * without having the submodule around, this indicates
890 * an expert who knows what they are doing or a
891 * maintainer integrating work from other people. In
892 * both cases it should be safe to skip this check.
893 */
894 return 0;
895
896 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
897 struct child_process cp = CHILD_PROCESS_INIT;
898 struct strbuf buf = STRBUF_INIT;
899 int needs_pushing = 0;
900
901 argv_array_push(&cp.args, "rev-list");
902 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
903 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
904
905 prepare_submodule_repo_env(&cp.env_array);
906 cp.git_cmd = 1;
907 cp.no_stdin = 1;
908 cp.out = -1;
909 cp.dir = path;
910 if (start_command(&cp))
911 die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
912 path);
913 if (strbuf_read(&buf, cp.out, 41))
914 needs_pushing = 1;
915 finish_command(&cp);
916 close(cp.out);
917 strbuf_release(&buf);
918 return needs_pushing;
919 }
920
921 return 0;
922 }
923
924 int find_unpushed_submodules(struct oid_array *commits,
925 const char *remotes_name, struct string_list *needs_pushing)
926 {
927 struct string_list submodules = STRING_LIST_INIT_DUP;
928 struct string_list_item *name;
929 struct argv_array argv = ARGV_ARRAY_INIT;
930
931 /* argv.argv[0] will be ignored by setup_revisions */
932 argv_array_push(&argv, "find_unpushed_submodules");
933 oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
934 argv_array_push(&argv, "--not");
935 argv_array_pushf(&argv, "--remotes=%s", remotes_name);
936
937 collect_changed_submodules(&submodules, &argv);
938
939 for_each_string_list_item(name, &submodules) {
940 struct oid_array *commits = name->util;
941 const struct submodule *submodule;
942 const char *path = NULL;
943
944 submodule = submodule_from_name(&null_oid, name->string);
945 if (submodule)
946 path = submodule->path;
947 else
948 path = default_name_or_path(name->string);
949
950 if (!path)
951 continue;
952
953 if (submodule_needs_pushing(path, commits))
954 string_list_insert(needs_pushing, path);
955 }
956
957 free_submodules_oids(&submodules);
958 argv_array_clear(&argv);
959
960 return needs_pushing->nr;
961 }
962
963 static int push_submodule(const char *path,
964 const struct remote *remote,
965 const char **refspec, int refspec_nr,
966 const struct string_list *push_options,
967 int dry_run)
968 {
969 if (add_submodule_odb(path))
970 return 1;
971
972 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
973 struct child_process cp = CHILD_PROCESS_INIT;
974 argv_array_push(&cp.args, "push");
975 if (dry_run)
976 argv_array_push(&cp.args, "--dry-run");
977
978 if (push_options && push_options->nr) {
979 const struct string_list_item *item;
980 for_each_string_list_item(item, push_options)
981 argv_array_pushf(&cp.args, "--push-option=%s",
982 item->string);
983 }
984
985 if (remote->origin != REMOTE_UNCONFIGURED) {
986 int i;
987 argv_array_push(&cp.args, remote->name);
988 for (i = 0; i < refspec_nr; i++)
989 argv_array_push(&cp.args, refspec[i]);
990 }
991
992 prepare_submodule_repo_env(&cp.env_array);
993 cp.git_cmd = 1;
994 cp.no_stdin = 1;
995 cp.dir = path;
996 if (run_command(&cp))
997 return 0;
998 close(cp.out);
999 }
1000
1001 return 1;
1002 }
1003
1004 /*
1005 * Perform a check in the submodule to see if the remote and refspec work.
1006 * Die if the submodule can't be pushed.
1007 */
1008 static void submodule_push_check(const char *path, const char *head,
1009 const struct remote *remote,
1010 const char **refspec, int refspec_nr)
1011 {
1012 struct child_process cp = CHILD_PROCESS_INIT;
1013 int i;
1014
1015 argv_array_push(&cp.args, "submodule--helper");
1016 argv_array_push(&cp.args, "push-check");
1017 argv_array_push(&cp.args, head);
1018 argv_array_push(&cp.args, remote->name);
1019
1020 for (i = 0; i < refspec_nr; i++)
1021 argv_array_push(&cp.args, refspec[i]);
1022
1023 prepare_submodule_repo_env(&cp.env_array);
1024 cp.git_cmd = 1;
1025 cp.no_stdin = 1;
1026 cp.no_stdout = 1;
1027 cp.dir = path;
1028
1029 /*
1030 * Simply indicate if 'submodule--helper push-check' failed.
1031 * More detailed error information will be provided by the
1032 * child process.
1033 */
1034 if (run_command(&cp))
1035 die("process for submodule '%s' failed", path);
1036 }
1037
1038 int push_unpushed_submodules(struct oid_array *commits,
1039 const struct remote *remote,
1040 const char **refspec, int refspec_nr,
1041 const struct string_list *push_options,
1042 int dry_run)
1043 {
1044 int i, ret = 1;
1045 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1046
1047 if (!find_unpushed_submodules(commits, remote->name, &needs_pushing))
1048 return 1;
1049
1050 /*
1051 * Verify that the remote and refspec can be propagated to all
1052 * submodules. This check can be skipped if the remote and refspec
1053 * won't be propagated due to the remote being unconfigured (e.g. a URL
1054 * instead of a remote name).
1055 */
1056 if (remote->origin != REMOTE_UNCONFIGURED) {
1057 char *head;
1058 struct object_id head_oid;
1059
1060 head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1061 if (!head)
1062 die(_("Failed to resolve HEAD as a valid ref."));
1063
1064 for (i = 0; i < needs_pushing.nr; i++)
1065 submodule_push_check(needs_pushing.items[i].string,
1066 head, remote,
1067 refspec, refspec_nr);
1068 free(head);
1069 }
1070
1071 /* Actually push the submodules */
1072 for (i = 0; i < needs_pushing.nr; i++) {
1073 const char *path = needs_pushing.items[i].string;
1074 fprintf(stderr, "Pushing submodule '%s'\n", path);
1075 if (!push_submodule(path, remote, refspec, refspec_nr,
1076 push_options, dry_run)) {
1077 fprintf(stderr, "Unable to push submodule '%s'\n", path);
1078 ret = 0;
1079 }
1080 }
1081
1082 string_list_clear(&needs_pushing, 0);
1083
1084 return ret;
1085 }
1086
1087 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1088 int flags, void *data)
1089 {
1090 struct oid_array *array = data;
1091 oid_array_append(array, oid);
1092 return 0;
1093 }
1094
1095 void check_for_new_submodule_commits(struct object_id *oid)
1096 {
1097 if (!initialized_fetch_ref_tips) {
1098 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1099 initialized_fetch_ref_tips = 1;
1100 }
1101
1102 oid_array_append(&ref_tips_after_fetch, oid);
1103 }
1104
1105 static void calculate_changed_submodule_paths(void)
1106 {
1107 struct argv_array argv = ARGV_ARRAY_INIT;
1108 struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1109 const struct string_list_item *name;
1110
1111 /* No need to check if there are no submodules configured */
1112 if (!submodule_from_path(NULL, NULL))
1113 return;
1114
1115 argv_array_push(&argv, "--"); /* argv[0] program name */
1116 oid_array_for_each_unique(&ref_tips_after_fetch,
1117 append_oid_to_argv, &argv);
1118 argv_array_push(&argv, "--not");
1119 oid_array_for_each_unique(&ref_tips_before_fetch,
1120 append_oid_to_argv, &argv);
1121
1122 /*
1123 * Collect all submodules (whether checked out or not) for which new
1124 * commits have been recorded upstream in "changed_submodule_names".
1125 */
1126 collect_changed_submodules(&changed_submodules, &argv);
1127
1128 for_each_string_list_item(name, &changed_submodules) {
1129 struct oid_array *commits = name->util;
1130 const struct submodule *submodule;
1131 const char *path = NULL;
1132
1133 submodule = submodule_from_name(&null_oid, name->string);
1134 if (submodule)
1135 path = submodule->path;
1136 else
1137 path = default_name_or_path(name->string);
1138
1139 if (!path)
1140 continue;
1141
1142 if (!submodule_has_commits(path, commits))
1143 string_list_append(&changed_submodule_names, name->string);
1144 }
1145
1146 free_submodules_oids(&changed_submodules);
1147 argv_array_clear(&argv);
1148 oid_array_clear(&ref_tips_before_fetch);
1149 oid_array_clear(&ref_tips_after_fetch);
1150 initialized_fetch_ref_tips = 0;
1151 }
1152
1153 int submodule_touches_in_range(struct object_id *excl_oid,
1154 struct object_id *incl_oid)
1155 {
1156 struct string_list subs = STRING_LIST_INIT_DUP;
1157 struct argv_array args = ARGV_ARRAY_INIT;
1158 int ret;
1159
1160 /* No need to check if there are no submodules configured */
1161 if (!submodule_from_path(NULL, NULL))
1162 return 0;
1163
1164 argv_array_push(&args, "--"); /* args[0] program name */
1165 argv_array_push(&args, oid_to_hex(incl_oid));
1166 argv_array_push(&args, "--not");
1167 argv_array_push(&args, oid_to_hex(excl_oid));
1168
1169 collect_changed_submodules(&subs, &args);
1170 ret = subs.nr;
1171
1172 argv_array_clear(&args);
1173
1174 free_submodules_oids(&subs);
1175 return ret;
1176 }
1177
1178 struct submodule_parallel_fetch {
1179 int count;
1180 struct argv_array args;
1181 const char *work_tree;
1182 const char *prefix;
1183 int command_line_option;
1184 int default_option;
1185 int quiet;
1186 int result;
1187 };
1188 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}
1189
1190 static int get_fetch_recurse_config(const struct submodule *submodule,
1191 struct submodule_parallel_fetch *spf)
1192 {
1193 if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
1194 return spf->command_line_option;
1195
1196 if (submodule) {
1197 char *key;
1198 const char *value;
1199
1200 int fetch_recurse = submodule->fetch_recurse;
1201 key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
1202 if (!repo_config_get_string_const(the_repository, key, &value)) {
1203 fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
1204 }
1205 free(key);
1206
1207 if (fetch_recurse != RECURSE_SUBMODULES_NONE)
1208 /* local config overrules everything except commandline */
1209 return fetch_recurse;
1210 }
1211
1212 return spf->default_option;
1213 }
1214
1215 static int get_next_submodule(struct child_process *cp,
1216 struct strbuf *err, void *data, void **task_cb)
1217 {
1218 int ret = 0;
1219 struct submodule_parallel_fetch *spf = data;
1220
1221 for (; spf->count < active_nr; spf->count++) {
1222 struct strbuf submodule_path = STRBUF_INIT;
1223 struct strbuf submodule_git_dir = STRBUF_INIT;
1224 struct strbuf submodule_prefix = STRBUF_INIT;
1225 const struct cache_entry *ce = active_cache[spf->count];
1226 const char *git_dir, *default_argv;
1227 const struct submodule *submodule;
1228 struct submodule default_submodule = SUBMODULE_INIT;
1229
1230 if (!S_ISGITLINK(ce->ce_mode))
1231 continue;
1232
1233 submodule = submodule_from_path(&null_oid, ce->name);
1234 if (!submodule) {
1235 const char *name = default_name_or_path(ce->name);
1236 if (name) {
1237 default_submodule.path = default_submodule.name = name;
1238 submodule = &default_submodule;
1239 }
1240 }
1241
1242 switch (get_fetch_recurse_config(submodule, spf))
1243 {
1244 default:
1245 case RECURSE_SUBMODULES_DEFAULT:
1246 case RECURSE_SUBMODULES_ON_DEMAND:
1247 if (!submodule || !unsorted_string_list_lookup(&changed_submodule_names,
1248 submodule->name))
1249 continue;
1250 default_argv = "on-demand";
1251 break;
1252 case RECURSE_SUBMODULES_ON:
1253 default_argv = "yes";
1254 break;
1255 case RECURSE_SUBMODULES_OFF:
1256 continue;
1257 }
1258
1259 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
1260 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1261 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1262 git_dir = read_gitfile(submodule_git_dir.buf);
1263 if (!git_dir)
1264 git_dir = submodule_git_dir.buf;
1265 if (is_directory(git_dir)) {
1266 child_process_init(cp);
1267 cp->dir = strbuf_detach(&submodule_path, NULL);
1268 prepare_submodule_repo_env(&cp->env_array);
1269 cp->git_cmd = 1;
1270 if (!spf->quiet)
1271 strbuf_addf(err, "Fetching submodule %s%s\n",
1272 spf->prefix, ce->name);
1273 argv_array_init(&cp->args);
1274 argv_array_pushv(&cp->args, spf->args.argv);
1275 argv_array_push(&cp->args, default_argv);
1276 argv_array_push(&cp->args, "--submodule-prefix");
1277 argv_array_push(&cp->args, submodule_prefix.buf);
1278 ret = 1;
1279 }
1280 strbuf_release(&submodule_path);
1281 strbuf_release(&submodule_git_dir);
1282 strbuf_release(&submodule_prefix);
1283 if (ret) {
1284 spf->count++;
1285 return 1;
1286 }
1287 }
1288 return 0;
1289 }
1290
1291 static int fetch_start_failure(struct strbuf *err,
1292 void *cb, void *task_cb)
1293 {
1294 struct submodule_parallel_fetch *spf = cb;
1295
1296 spf->result = 1;
1297
1298 return 0;
1299 }
1300
1301 static int fetch_finish(int retvalue, struct strbuf *err,
1302 void *cb, void *task_cb)
1303 {
1304 struct submodule_parallel_fetch *spf = cb;
1305
1306 if (retvalue)
1307 spf->result = 1;
1308
1309 return 0;
1310 }
1311
1312 int fetch_populated_submodules(const struct argv_array *options,
1313 const char *prefix, int command_line_option,
1314 int default_option,
1315 int quiet, int max_parallel_jobs)
1316 {
1317 int i;
1318 struct submodule_parallel_fetch spf = SPF_INIT;
1319
1320 spf.work_tree = get_git_work_tree();
1321 spf.command_line_option = command_line_option;
1322 spf.default_option = default_option;
1323 spf.quiet = quiet;
1324 spf.prefix = prefix;
1325
1326 if (!spf.work_tree)
1327 goto out;
1328
1329 if (read_cache() < 0)
1330 die("index file corrupt");
1331
1332 argv_array_push(&spf.args, "fetch");
1333 for (i = 0; i < options->argc; i++)
1334 argv_array_push(&spf.args, options->argv[i]);
1335 argv_array_push(&spf.args, "--recurse-submodules-default");
1336 /* default value, "--submodule-prefix" and its value are added later */
1337
1338 calculate_changed_submodule_paths();
1339 run_processes_parallel(max_parallel_jobs,
1340 get_next_submodule,
1341 fetch_start_failure,
1342 fetch_finish,
1343 &spf);
1344
1345 argv_array_clear(&spf.args);
1346 out:
1347 string_list_clear(&changed_submodule_names, 1);
1348 return spf.result;
1349 }
1350
1351 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1352 {
1353 struct child_process cp = CHILD_PROCESS_INIT;
1354 struct strbuf buf = STRBUF_INIT;
1355 FILE *fp;
1356 unsigned dirty_submodule = 0;
1357 const char *git_dir;
1358 int ignore_cp_exit_code = 0;
1359
1360 strbuf_addf(&buf, "%s/.git", path);
1361 git_dir = read_gitfile(buf.buf);
1362 if (!git_dir)
1363 git_dir = buf.buf;
1364 if (!is_git_directory(git_dir)) {
1365 if (is_directory(git_dir))
1366 die(_("'%s' not recognized as a git repository"), git_dir);
1367 strbuf_release(&buf);
1368 /* The submodule is not checked out, so it is not modified */
1369 return 0;
1370 }
1371 strbuf_reset(&buf);
1372
1373 argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1374 if (ignore_untracked)
1375 argv_array_push(&cp.args, "-uno");
1376
1377 prepare_submodule_repo_env(&cp.env_array);
1378 cp.git_cmd = 1;
1379 cp.no_stdin = 1;
1380 cp.out = -1;
1381 cp.dir = path;
1382 if (start_command(&cp))
1383 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1384
1385 fp = xfdopen(cp.out, "r");
1386 while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1387 /* regular untracked files */
1388 if (buf.buf[0] == '?')
1389 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1390
1391 if (buf.buf[0] == 'u' ||
1392 buf.buf[0] == '1' ||
1393 buf.buf[0] == '2') {
1394 /* T = line type, XY = status, SSSS = submodule state */
1395 if (buf.len < strlen("T XY SSSS"))
1396 die("BUG: invalid status --porcelain=2 line %s",
1397 buf.buf);
1398
1399 if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1400 /* nested untracked file */
1401 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1402
1403 if (buf.buf[0] == 'u' ||
1404 buf.buf[0] == '2' ||
1405 memcmp(buf.buf + 5, "S..U", 4))
1406 /* other change */
1407 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1408 }
1409
1410 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1411 ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1412 ignore_untracked)) {
1413 /*
1414 * We're not interested in any further information from
1415 * the child any more, neither output nor its exit code.
1416 */
1417 ignore_cp_exit_code = 1;
1418 break;
1419 }
1420 }
1421 fclose(fp);
1422
1423 if (finish_command(&cp) && !ignore_cp_exit_code)
1424 die("'git status --porcelain=2' failed in submodule %s", path);
1425
1426 strbuf_release(&buf);
1427 return dirty_submodule;
1428 }
1429
1430 int submodule_uses_gitfile(const char *path)
1431 {
1432 struct child_process cp = CHILD_PROCESS_INIT;
1433 const char *argv[] = {
1434 "submodule",
1435 "foreach",
1436 "--quiet",
1437 "--recursive",
1438 "test -f .git",
1439 NULL,
1440 };
1441 struct strbuf buf = STRBUF_INIT;
1442 const char *git_dir;
1443
1444 strbuf_addf(&buf, "%s/.git", path);
1445 git_dir = read_gitfile(buf.buf);
1446 if (!git_dir) {
1447 strbuf_release(&buf);
1448 return 0;
1449 }
1450 strbuf_release(&buf);
1451
1452 /* Now test that all nested submodules use a gitfile too */
1453 cp.argv = argv;
1454 prepare_submodule_repo_env(&cp.env_array);
1455 cp.git_cmd = 1;
1456 cp.no_stdin = 1;
1457 cp.no_stderr = 1;
1458 cp.no_stdout = 1;
1459 cp.dir = path;
1460 if (run_command(&cp))
1461 return 0;
1462
1463 return 1;
1464 }
1465
1466 /*
1467 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1468 * when doing so.
1469 *
1470 * Return 1 if we'd lose data, return 0 if the removal is fine,
1471 * and negative values for errors.
1472 */
1473 int bad_to_remove_submodule(const char *path, unsigned flags)
1474 {
1475 ssize_t len;
1476 struct child_process cp = CHILD_PROCESS_INIT;
1477 struct strbuf buf = STRBUF_INIT;
1478 int ret = 0;
1479
1480 if (!file_exists(path) || is_empty_dir(path))
1481 return 0;
1482
1483 if (!submodule_uses_gitfile(path))
1484 return 1;
1485
1486 argv_array_pushl(&cp.args, "status", "--porcelain",
1487 "--ignore-submodules=none", NULL);
1488
1489 if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1490 argv_array_push(&cp.args, "-uno");
1491 else
1492 argv_array_push(&cp.args, "-uall");
1493
1494 if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1495 argv_array_push(&cp.args, "--ignored");
1496
1497 prepare_submodule_repo_env(&cp.env_array);
1498 cp.git_cmd = 1;
1499 cp.no_stdin = 1;
1500 cp.out = -1;
1501 cp.dir = path;
1502 if (start_command(&cp)) {
1503 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1504 die(_("could not start 'git status' in submodule '%s'"),
1505 path);
1506 ret = -1;
1507 goto out;
1508 }
1509
1510 len = strbuf_read(&buf, cp.out, 1024);
1511 if (len > 2)
1512 ret = 1;
1513 close(cp.out);
1514
1515 if (finish_command(&cp)) {
1516 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1517 die(_("could not run 'git status' in submodule '%s'"),
1518 path);
1519 ret = -1;
1520 }
1521 out:
1522 strbuf_release(&buf);
1523 return ret;
1524 }
1525
1526 static const char *get_super_prefix_or_empty(void)
1527 {
1528 const char *s = get_super_prefix();
1529 if (!s)
1530 s = "";
1531 return s;
1532 }
1533
1534 static int submodule_has_dirty_index(const struct submodule *sub)
1535 {
1536 struct child_process cp = CHILD_PROCESS_INIT;
1537
1538 prepare_submodule_repo_env(&cp.env_array);
1539
1540 cp.git_cmd = 1;
1541 argv_array_pushl(&cp.args, "diff-index", "--quiet",
1542 "--cached", "HEAD", NULL);
1543 cp.no_stdin = 1;
1544 cp.no_stdout = 1;
1545 cp.dir = sub->path;
1546 if (start_command(&cp))
1547 die("could not recurse into submodule '%s'", sub->path);
1548
1549 return finish_command(&cp);
1550 }
1551
1552 static void submodule_reset_index(const char *path)
1553 {
1554 struct child_process cp = CHILD_PROCESS_INIT;
1555 prepare_submodule_repo_env(&cp.env_array);
1556
1557 cp.git_cmd = 1;
1558 cp.no_stdin = 1;
1559 cp.dir = path;
1560
1561 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1562 get_super_prefix_or_empty(), path);
1563 argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1564
1565 argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1566
1567 if (run_command(&cp))
1568 die("could not reset submodule index");
1569 }
1570
1571 /**
1572 * Moves a submodule at a given path from a given head to another new head.
1573 * For edge cases (a submodule coming into existence or removing a submodule)
1574 * pass NULL for old or new respectively.
1575 */
1576 int submodule_move_head(const char *path,
1577 const char *old,
1578 const char *new,
1579 unsigned flags)
1580 {
1581 int ret = 0;
1582 struct child_process cp = CHILD_PROCESS_INIT;
1583 const struct submodule *sub;
1584 int *error_code_ptr, error_code;
1585
1586 if (!is_submodule_active(the_repository, path))
1587 return 0;
1588
1589 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1590 /*
1591 * Pass non NULL pointer to is_submodule_populated_gently
1592 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1593 * to fixup the submodule in the force case later.
1594 */
1595 error_code_ptr = &error_code;
1596 else
1597 error_code_ptr = NULL;
1598
1599 if (old && !is_submodule_populated_gently(path, error_code_ptr))
1600 return 0;
1601
1602 sub = submodule_from_path(&null_oid, path);
1603
1604 if (!sub)
1605 die("BUG: could not get submodule information for '%s'", path);
1606
1607 if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1608 /* Check if the submodule has a dirty index. */
1609 if (submodule_has_dirty_index(sub))
1610 return error(_("submodule '%s' has dirty index"), path);
1611 }
1612
1613 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1614 if (old) {
1615 if (!submodule_uses_gitfile(path))
1616 absorb_git_dir_into_superproject("", path,
1617 ABSORB_GITDIR_RECURSE_SUBMODULES);
1618 } else {
1619 char *gitdir = xstrfmt("%s/modules/%s",
1620 get_git_common_dir(), sub->name);
1621 connect_work_tree_and_git_dir(path, gitdir);
1622 free(gitdir);
1623
1624 /* make sure the index is clean as well */
1625 submodule_reset_index(path);
1626 }
1627
1628 if (old && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1629 char *gitdir = xstrfmt("%s/modules/%s",
1630 get_git_common_dir(), sub->name);
1631 connect_work_tree_and_git_dir(path, gitdir);
1632 free(gitdir);
1633 }
1634 }
1635
1636 prepare_submodule_repo_env(&cp.env_array);
1637
1638 cp.git_cmd = 1;
1639 cp.no_stdin = 1;
1640 cp.dir = path;
1641
1642 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1643 get_super_prefix_or_empty(), path);
1644 argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1645
1646 if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1647 argv_array_push(&cp.args, "-n");
1648 else
1649 argv_array_push(&cp.args, "-u");
1650
1651 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1652 argv_array_push(&cp.args, "--reset");
1653 else
1654 argv_array_push(&cp.args, "-m");
1655
1656 argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
1657 argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
1658
1659 if (run_command(&cp)) {
1660 ret = -1;
1661 goto out;
1662 }
1663
1664 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1665 if (new) {
1666 child_process_init(&cp);
1667 /* also set the HEAD accordingly */
1668 cp.git_cmd = 1;
1669 cp.no_stdin = 1;
1670 cp.dir = path;
1671
1672 prepare_submodule_repo_env(&cp.env_array);
1673 argv_array_pushl(&cp.args, "update-ref", "HEAD",
1674 "--no-deref", new, NULL);
1675
1676 if (run_command(&cp)) {
1677 ret = -1;
1678 goto out;
1679 }
1680 } else {
1681 struct strbuf sb = STRBUF_INIT;
1682
1683 strbuf_addf(&sb, "%s/.git", path);
1684 unlink_or_warn(sb.buf);
1685 strbuf_release(&sb);
1686
1687 if (is_empty_dir(path))
1688 rmdir_or_warn(path);
1689 }
1690 }
1691 out:
1692 return ret;
1693 }
1694
1695 static int find_first_merges(struct object_array *result, const char *path,
1696 struct commit *a, struct commit *b)
1697 {
1698 int i, j;
1699 struct object_array merges = OBJECT_ARRAY_INIT;
1700 struct commit *commit;
1701 int contains_another;
1702
1703 char merged_revision[42];
1704 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1705 "--all", merged_revision, NULL };
1706 struct rev_info revs;
1707 struct setup_revision_opt rev_opts;
1708
1709 memset(result, 0, sizeof(struct object_array));
1710 memset(&rev_opts, 0, sizeof(rev_opts));
1711
1712 /* get all revisions that merge commit a */
1713 xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1714 oid_to_hex(&a->object.oid));
1715 init_revisions(&revs, NULL);
1716 rev_opts.submodule = path;
1717 /* FIXME: can't handle linked worktrees in submodules yet */
1718 revs.single_worktree = path != NULL;
1719 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1720
1721 /* save all revisions from the above list that contain b */
1722 if (prepare_revision_walk(&revs))
1723 die("revision walk setup failed");
1724 while ((commit = get_revision(&revs)) != NULL) {
1725 struct object *o = &(commit->object);
1726 if (in_merge_bases(b, commit))
1727 add_object_array(o, NULL, &merges);
1728 }
1729 reset_revision_walk();
1730
1731 /* Now we've got all merges that contain a and b. Prune all
1732 * merges that contain another found merge and save them in
1733 * result.
1734 */
1735 for (i = 0; i < merges.nr; i++) {
1736 struct commit *m1 = (struct commit *) merges.objects[i].item;
1737
1738 contains_another = 0;
1739 for (j = 0; j < merges.nr; j++) {
1740 struct commit *m2 = (struct commit *) merges.objects[j].item;
1741 if (i != j && in_merge_bases(m2, m1)) {
1742 contains_another = 1;
1743 break;
1744 }
1745 }
1746
1747 if (!contains_another)
1748 add_object_array(merges.objects[i].item, NULL, result);
1749 }
1750
1751 object_array_clear(&merges);
1752 return result->nr;
1753 }
1754
1755 static void print_commit(struct commit *commit)
1756 {
1757 struct strbuf sb = STRBUF_INIT;
1758 struct pretty_print_context ctx = {0};
1759 ctx.date_mode.type = DATE_NORMAL;
1760 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1761 fprintf(stderr, "%s\n", sb.buf);
1762 strbuf_release(&sb);
1763 }
1764
1765 #define MERGE_WARNING(path, msg) \
1766 warning("Failed to merge submodule %s (%s)", path, msg);
1767
1768 int merge_submodule(struct object_id *result, const char *path,
1769 const struct object_id *base, const struct object_id *a,
1770 const struct object_id *b, int search)
1771 {
1772 struct commit *commit_base, *commit_a, *commit_b;
1773 int parent_count;
1774 struct object_array merges;
1775
1776 int i;
1777
1778 /* store a in result in case we fail */
1779 oidcpy(result, a);
1780
1781 /* we can not handle deletion conflicts */
1782 if (is_null_oid(base))
1783 return 0;
1784 if (is_null_oid(a))
1785 return 0;
1786 if (is_null_oid(b))
1787 return 0;
1788
1789 if (add_submodule_odb(path)) {
1790 MERGE_WARNING(path, "not checked out");
1791 return 0;
1792 }
1793
1794 if (!(commit_base = lookup_commit_reference(base)) ||
1795 !(commit_a = lookup_commit_reference(a)) ||
1796 !(commit_b = lookup_commit_reference(b))) {
1797 MERGE_WARNING(path, "commits not present");
1798 return 0;
1799 }
1800
1801 /* check whether both changes are forward */
1802 if (!in_merge_bases(commit_base, commit_a) ||
1803 !in_merge_bases(commit_base, commit_b)) {
1804 MERGE_WARNING(path, "commits don't follow merge-base");
1805 return 0;
1806 }
1807
1808 /* Case #1: a is contained in b or vice versa */
1809 if (in_merge_bases(commit_a, commit_b)) {
1810 oidcpy(result, b);
1811 return 1;
1812 }
1813 if (in_merge_bases(commit_b, commit_a)) {
1814 oidcpy(result, a);
1815 return 1;
1816 }
1817
1818 /*
1819 * Case #2: There are one or more merges that contain a and b in
1820 * the submodule. If there is only one, then present it as a
1821 * suggestion to the user, but leave it marked unmerged so the
1822 * user needs to confirm the resolution.
1823 */
1824
1825 /* Skip the search if makes no sense to the calling context. */
1826 if (!search)
1827 return 0;
1828
1829 /* find commit which merges them */
1830 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1831 switch (parent_count) {
1832 case 0:
1833 MERGE_WARNING(path, "merge following commits not found");
1834 break;
1835
1836 case 1:
1837 MERGE_WARNING(path, "not fast-forward");
1838 fprintf(stderr, "Found a possible merge resolution "
1839 "for the submodule:\n");
1840 print_commit((struct commit *) merges.objects[0].item);
1841 fprintf(stderr,
1842 "If this is correct simply add it to the index "
1843 "for example\n"
1844 "by using:\n\n"
1845 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1846 "which will accept this suggestion.\n",
1847 oid_to_hex(&merges.objects[0].item->oid), path);
1848 break;
1849
1850 default:
1851 MERGE_WARNING(path, "multiple merges found");
1852 for (i = 0; i < merges.nr; i++)
1853 print_commit((struct commit *) merges.objects[i].item);
1854 }
1855
1856 object_array_clear(&merges);
1857 return 0;
1858 }
1859
1860 /*
1861 * Embeds a single submodules git directory into the superprojects git dir,
1862 * non recursively.
1863 */
1864 static void relocate_single_git_dir_into_superproject(const char *prefix,
1865 const char *path)
1866 {
1867 char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1868 const char *new_git_dir;
1869 const struct submodule *sub;
1870
1871 if (submodule_uses_worktrees(path))
1872 die(_("relocate_gitdir for submodule '%s' with "
1873 "more than one worktree not supported"), path);
1874
1875 old_git_dir = xstrfmt("%s/.git", path);
1876 if (read_gitfile(old_git_dir))
1877 /* If it is an actual gitfile, it doesn't need migration. */
1878 return;
1879
1880 real_old_git_dir = real_pathdup(old_git_dir, 1);
1881
1882 sub = submodule_from_path(&null_oid, path);
1883 if (!sub)
1884 die(_("could not lookup name for submodule '%s'"), path);
1885
1886 new_git_dir = git_path("modules/%s", sub->name);
1887 if (safe_create_leading_directories_const(new_git_dir) < 0)
1888 die(_("could not create directory '%s'"), new_git_dir);
1889 real_new_git_dir = real_pathdup(new_git_dir, 1);
1890
1891 fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1892 get_super_prefix_or_empty(), path,
1893 real_old_git_dir, real_new_git_dir);
1894
1895 relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1896
1897 free(old_git_dir);
1898 free(real_old_git_dir);
1899 free(real_new_git_dir);
1900 }
1901
1902 /*
1903 * Migrate the git directory of the submodule given by path from
1904 * having its git directory within the working tree to the git dir nested
1905 * in its superprojects git dir under modules/.
1906 */
1907 void absorb_git_dir_into_superproject(const char *prefix,
1908 const char *path,
1909 unsigned flags)
1910 {
1911 int err_code;
1912 const char *sub_git_dir;
1913 struct strbuf gitdir = STRBUF_INIT;
1914 strbuf_addf(&gitdir, "%s/.git", path);
1915 sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1916
1917 /* Not populated? */
1918 if (!sub_git_dir) {
1919 const struct submodule *sub;
1920
1921 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1922 /* unpopulated as expected */
1923 strbuf_release(&gitdir);
1924 return;
1925 }
1926
1927 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1928 /* We don't know what broke here. */
1929 read_gitfile_error_die(err_code, path, NULL);
1930
1931 /*
1932 * Maybe populated, but no git directory was found?
1933 * This can happen if the superproject is a submodule
1934 * itself and was just absorbed. The absorption of the
1935 * superproject did not rewrite the git file links yet,
1936 * fix it now.
1937 */
1938 sub = submodule_from_path(&null_oid, path);
1939 if (!sub)
1940 die(_("could not lookup name for submodule '%s'"), path);
1941 connect_work_tree_and_git_dir(path,
1942 git_path("modules/%s", sub->name));
1943 } else {
1944 /* Is it already absorbed into the superprojects git dir? */
1945 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1946 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1947
1948 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1949 relocate_single_git_dir_into_superproject(prefix, path);
1950
1951 free(real_sub_git_dir);
1952 free(real_common_git_dir);
1953 }
1954 strbuf_release(&gitdir);
1955
1956 if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1957 struct child_process cp = CHILD_PROCESS_INIT;
1958 struct strbuf sb = STRBUF_INIT;
1959
1960 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1961 die("BUG: we don't know how to pass the flags down?");
1962
1963 strbuf_addstr(&sb, get_super_prefix_or_empty());
1964 strbuf_addstr(&sb, path);
1965 strbuf_addch(&sb, '/');
1966
1967 cp.dir = path;
1968 cp.git_cmd = 1;
1969 cp.no_stdin = 1;
1970 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1971 "submodule--helper",
1972 "absorb-git-dirs", NULL);
1973 prepare_submodule_repo_env(&cp.env_array);
1974 if (run_command(&cp))
1975 die(_("could not recurse into submodule '%s'"), path);
1976
1977 strbuf_release(&sb);
1978 }
1979 }
1980
1981 const char *get_superproject_working_tree(void)
1982 {
1983 struct child_process cp = CHILD_PROCESS_INIT;
1984 struct strbuf sb = STRBUF_INIT;
1985 const char *one_up = real_path_if_valid("../");
1986 const char *cwd = xgetcwd();
1987 const char *ret = NULL;
1988 const char *subpath;
1989 int code;
1990 ssize_t len;
1991
1992 if (!is_inside_work_tree())
1993 /*
1994 * FIXME:
1995 * We might have a superproject, but it is harder
1996 * to determine.
1997 */
1998 return NULL;
1999
2000 if (!one_up)
2001 return NULL;
2002
2003 subpath = relative_path(cwd, one_up, &sb);
2004
2005 prepare_submodule_repo_env(&cp.env_array);
2006 argv_array_pop(&cp.env_array);
2007
2008 argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
2009 "ls-files", "-z", "--stage", "--full-name", "--",
2010 subpath, NULL);
2011 strbuf_reset(&sb);
2012
2013 cp.no_stdin = 1;
2014 cp.no_stderr = 1;
2015 cp.out = -1;
2016 cp.git_cmd = 1;
2017
2018 if (start_command(&cp))
2019 die(_("could not start ls-files in .."));
2020
2021 len = strbuf_read(&sb, cp.out, PATH_MAX);
2022 close(cp.out);
2023
2024 if (starts_with(sb.buf, "160000")) {
2025 int super_sub_len;
2026 int cwd_len = strlen(cwd);
2027 char *super_sub, *super_wt;
2028
2029 /*
2030 * There is a superproject having this repo as a submodule.
2031 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
2032 * We're only interested in the name after the tab.
2033 */
2034 super_sub = strchr(sb.buf, '\t') + 1;
2035 super_sub_len = sb.buf + sb.len - super_sub - 1;
2036
2037 if (super_sub_len > cwd_len ||
2038 strcmp(&cwd[cwd_len - super_sub_len], super_sub))
2039 die (_("BUG: returned path string doesn't match cwd?"));
2040
2041 super_wt = xstrdup(cwd);
2042 super_wt[cwd_len - super_sub_len] = '\0';
2043
2044 ret = real_path(super_wt);
2045 free(super_wt);
2046 }
2047 strbuf_release(&sb);
2048
2049 code = finish_command(&cp);
2050
2051 if (code == 128)
2052 /* '../' is not a git repository */
2053 return NULL;
2054 if (code == 0 && len == 0)
2055 /* There is an unrelated git repository at '../' */
2056 return NULL;
2057 if (code)
2058 die(_("ls-tree returned unexpected return code %d"), code);
2059
2060 return ret;
2061 }
2062
2063 /*
2064 * Put the gitdir for a submodule (given relative to the main
2065 * repository worktree) into `buf`, or return -1 on error.
2066 */
2067 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
2068 {
2069 const struct submodule *sub;
2070 const char *git_dir;
2071 int ret = 0;
2072
2073 strbuf_reset(buf);
2074 strbuf_addstr(buf, submodule);
2075 strbuf_complete(buf, '/');
2076 strbuf_addstr(buf, ".git");
2077
2078 git_dir = read_gitfile(buf->buf);
2079 if (git_dir) {
2080 strbuf_reset(buf);
2081 strbuf_addstr(buf, git_dir);
2082 }
2083 if (!is_git_directory(buf->buf)) {
2084 sub = submodule_from_path(&null_oid, submodule);
2085 if (!sub) {
2086 ret = -1;
2087 goto cleanup;
2088 }
2089 strbuf_reset(buf);
2090 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
2091 }
2092
2093 cleanup:
2094 return ret;
2095 }
git for Debian