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