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Merge branch 'jk/unavailable-can-be-missing'
[alt-git.git] / submodule.c
blobeb08cf0782ad13d2629c54b8154f4afe78bd0650
1 #define NO_THE_INDEX_COMPATIBILITY_MACROS
2
3 #include "cache.h"
4 #include "repository.h"
5 #include "config.h"
6 #include "submodule-config.h"
7 #include "submodule.h"
8 #include "dir.h"
9 #include "diff.h"
10 #include "commit.h"
11 #include "revision.h"
12 #include "run-command.h"
13 #include "diffcore.h"
14 #include "refs.h"
15 #include "string-list.h"
16 #include "sha1-array.h"
17 #include "argv-array.h"
18 #include "blob.h"
19 #include "thread-utils.h"
20 #include "quote.h"
21 #include "remote.h"
22 #include "worktree.h"
23 #include "parse-options.h"
24 #include "object-store.h"
25
26 static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
27 static struct string_list changed_submodule_names = STRING_LIST_INIT_DUP;
28 static int initialized_fetch_ref_tips;
29 static struct oid_array ref_tips_before_fetch;
30 static struct oid_array ref_tips_after_fetch;
31
32 /*
33 * Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
34 * will be disabled because we can't guess what might be configured in
35 * .gitmodules unless the user resolves the conflict.
36 */
37 int is_gitmodules_unmerged(const struct index_state *istate)
38 {
39 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
40 if (pos < 0) { /* .gitmodules not found or isn't merged */
41 pos = -1 - pos;
42 if (istate->cache_nr > pos) { /* there is a .gitmodules */
43 const struct cache_entry *ce = istate->cache[pos];
44 if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
45 !strcmp(ce->name, GITMODULES_FILE))
46 return 1;
47 }
48 }
49
50 return 0;
51 }
52
53 /*
54 * Check if the .gitmodules file has unstaged modifications. This must be
55 * checked before allowing modifications to the .gitmodules file with the
56 * intention to stage them later, because when continuing we would stage the
57 * modifications the user didn't stage herself too. That might change in a
58 * future version when we learn to stage the changes we do ourselves without
59 * staging any previous modifications.
60 */
61 int is_staging_gitmodules_ok(struct index_state *istate)
62 {
63 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
64
65 if ((pos >= 0) && (pos < istate->cache_nr)) {
66 struct stat st;
67 if (lstat(GITMODULES_FILE, &st) == 0 &&
68 ie_match_stat(istate, istate->cache[pos], &st,
69 CE_MATCH_IGNORE_FSMONITOR) & DATA_CHANGED)
70 return 0;
71 }
72
73 return 1;
74 }
75
76 static int for_each_remote_ref_submodule(const char *submodule,
77 each_ref_fn fn, void *cb_data)
78 {
79 return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
80 fn, cb_data);
81 }
82
83 /*
84 * Try to update the "path" entry in the "submodule.<name>" section of the
85 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
86 * with the correct path=<oldpath> setting was found and we could update it.
87 */
88 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
89 {
90 struct strbuf entry = STRBUF_INIT;
91 const struct submodule *submodule;
92
93 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
94 return -1;
95
96 if (is_gitmodules_unmerged(&the_index))
97 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
98
99 submodule = submodule_from_path(the_repository, &null_oid, oldpath);
100 if (!submodule || !submodule->name) {
101 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
102 return -1;
103 }
104 strbuf_addstr(&entry, "submodule.");
105 strbuf_addstr(&entry, submodule->name);
106 strbuf_addstr(&entry, ".path");
107 if (git_config_set_in_file_gently(GITMODULES_FILE, entry.buf, newpath) < 0) {
108 /* Maybe the user already did that, don't error out here */
109 warning(_("Could not update .gitmodules entry %s"), entry.buf);
110 strbuf_release(&entry);
111 return -1;
112 }
113 strbuf_release(&entry);
114 return 0;
115 }
116
117 /*
118 * Try to remove the "submodule.<name>" section from .gitmodules where the given
119 * path is configured. Return 0 only if a .gitmodules file was found, a section
120 * with the correct path=<path> setting was found and we could remove it.
121 */
122 int remove_path_from_gitmodules(const char *path)
123 {
124 struct strbuf sect = STRBUF_INIT;
125 const struct submodule *submodule;
126
127 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
128 return -1;
129
130 if (is_gitmodules_unmerged(&the_index))
131 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
132
133 submodule = submodule_from_path(the_repository, &null_oid, path);
134 if (!submodule || !submodule->name) {
135 warning(_("Could not find section in .gitmodules where path=%s"), path);
136 return -1;
137 }
138 strbuf_addstr(&sect, "submodule.");
139 strbuf_addstr(&sect, submodule->name);
140 if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
141 /* Maybe the user already did that, don't error out here */
142 warning(_("Could not remove .gitmodules entry for %s"), path);
143 strbuf_release(&sect);
144 return -1;
145 }
146 strbuf_release(&sect);
147 return 0;
148 }
149
150 void stage_updated_gitmodules(struct index_state *istate)
151 {
152 if (add_file_to_index(istate, GITMODULES_FILE, 0))
153 die(_("staging updated .gitmodules failed"));
154 }
155
156 static int add_submodule_odb(const char *path)
157 {
158 struct strbuf objects_directory = STRBUF_INIT;
159 int ret = 0;
160
161 ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
162 if (ret)
163 goto done;
164 if (!is_directory(objects_directory.buf)) {
165 ret = -1;
166 goto done;
167 }
168 add_to_alternates_memory(objects_directory.buf);
169 done:
170 strbuf_release(&objects_directory);
171 return ret;
172 }
173
174 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
175 const char *path)
176 {
177 const struct submodule *submodule = submodule_from_path(the_repository,
178 &null_oid, path);
179 if (submodule) {
180 const char *ignore;
181 char *key;
182
183 key = xstrfmt("submodule.%s.ignore", submodule->name);
184 if (repo_config_get_string_const(the_repository, key, &ignore))
185 ignore = submodule->ignore;
186 free(key);
187
188 if (ignore)
189 handle_ignore_submodules_arg(diffopt, ignore);
190 else if (is_gitmodules_unmerged(&the_index))
191 diffopt->flags.ignore_submodules = 1;
192 }
193 }
194
195 /* Cheap function that only determines if we're interested in submodules at all */
196 int git_default_submodule_config(const char *var, const char *value, void *cb)
197 {
198 if (!strcmp(var, "submodule.recurse")) {
199 int v = git_config_bool(var, value) ?
200 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
201 config_update_recurse_submodules = v;
202 }
203 return 0;
204 }
205
206 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
207 const char *arg, int unset)
208 {
209 if (unset) {
210 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
211 return 0;
212 }
213 if (arg)
214 config_update_recurse_submodules =
215 parse_update_recurse_submodules_arg(opt->long_name,
216 arg);
217 else
218 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
219
220 return 0;
221 }
222
223 /*
224 * Determine if a submodule has been initialized at a given 'path'
225 */
226 int is_submodule_active(struct repository *repo, const char *path)
227 {
228 int ret = 0;
229 char *key = NULL;
230 char *value = NULL;
231 const struct string_list *sl;
232 const struct submodule *module;
233
234 module = submodule_from_path(repo, &null_oid, path);
235
236 /* early return if there isn't a path->module mapping */
237 if (!module)
238 return 0;
239
240 /* submodule.<name>.active is set */
241 key = xstrfmt("submodule.%s.active", module->name);
242 if (!repo_config_get_bool(repo, key, &ret)) {
243 free(key);
244 return ret;
245 }
246 free(key);
247
248 /* submodule.active is set */
249 sl = repo_config_get_value_multi(repo, "submodule.active");
250 if (sl) {
251 struct pathspec ps;
252 struct argv_array args = ARGV_ARRAY_INIT;
253 const struct string_list_item *item;
254
255 for_each_string_list_item(item, sl) {
256 argv_array_push(&args, item->string);
257 }
258
259 parse_pathspec(&ps, 0, 0, NULL, args.argv);
260 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
261
262 argv_array_clear(&args);
263 clear_pathspec(&ps);
264 return ret;
265 }
266
267 /* fallback to checking if the URL is set */
268 key = xstrfmt("submodule.%s.url", module->name);
269 ret = !repo_config_get_string(repo, key, &value);
270
271 free(value);
272 free(key);
273 return ret;
274 }
275
276 int is_submodule_populated_gently(const char *path, int *return_error_code)
277 {
278 int ret = 0;
279 char *gitdir = xstrfmt("%s/.git", path);
280
281 if (resolve_gitdir_gently(gitdir, return_error_code))
282 ret = 1;
283
284 free(gitdir);
285 return ret;
286 }
287
288 /*
289 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
290 */
291 void die_in_unpopulated_submodule(const struct index_state *istate,
292 const char *prefix)
293 {
294 int i, prefixlen;
295
296 if (!prefix)
297 return;
298
299 prefixlen = strlen(prefix);
300
301 for (i = 0; i < istate->cache_nr; i++) {
302 struct cache_entry *ce = istate->cache[i];
303 int ce_len = ce_namelen(ce);
304
305 if (!S_ISGITLINK(ce->ce_mode))
306 continue;
307 if (prefixlen <= ce_len)
308 continue;
309 if (strncmp(ce->name, prefix, ce_len))
310 continue;
311 if (prefix[ce_len] != '/')
312 continue;
313
314 die(_("in unpopulated submodule '%s'"), ce->name);
315 }
316 }
317
318 /*
319 * Dies if any paths in the provided pathspec descends into a submodule
320 */
321 void die_path_inside_submodule(const struct index_state *istate,
322 const struct pathspec *ps)
323 {
324 int i, j;
325
326 for (i = 0; i < istate->cache_nr; i++) {
327 struct cache_entry *ce = istate->cache[i];
328 int ce_len = ce_namelen(ce);
329
330 if (!S_ISGITLINK(ce->ce_mode))
331 continue;
332
333 for (j = 0; j < ps->nr ; j++) {
334 const struct pathspec_item *item = &ps->items[j];
335
336 if (item->len <= ce_len)
337 continue;
338 if (item->match[ce_len] != '/')
339 continue;
340 if (strncmp(ce->name, item->match, ce_len))
341 continue;
342 if (item->len == ce_len + 1)
343 continue;
344
345 die(_("Pathspec '%s' is in submodule '%.*s'"),
346 item->original, ce_len, ce->name);
347 }
348 }
349 }
350
351 enum submodule_update_type parse_submodule_update_type(const char *value)
352 {
353 if (!strcmp(value, "none"))
354 return SM_UPDATE_NONE;
355 else if (!strcmp(value, "checkout"))
356 return SM_UPDATE_CHECKOUT;
357 else if (!strcmp(value, "rebase"))
358 return SM_UPDATE_REBASE;
359 else if (!strcmp(value, "merge"))
360 return SM_UPDATE_MERGE;
361 else if (*value == '!')
362 return SM_UPDATE_COMMAND;
363 else
364 return SM_UPDATE_UNSPECIFIED;
365 }
366
367 int parse_submodule_update_strategy(const char *value,
368 struct submodule_update_strategy *dst)
369 {
370 enum submodule_update_type type;
371
372 free((void*)dst->command);
373 dst->command = NULL;
374
375 type = parse_submodule_update_type(value);
376 if (type == SM_UPDATE_UNSPECIFIED)
377 return -1;
378
379 dst->type = type;
380 if (type == SM_UPDATE_COMMAND)
381 dst->command = xstrdup(value + 1);
382
383 return 0;
384 }
385
386 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
387 {
388 struct strbuf sb = STRBUF_INIT;
389 switch (s->type) {
390 case SM_UPDATE_CHECKOUT:
391 return "checkout";
392 case SM_UPDATE_MERGE:
393 return "merge";
394 case SM_UPDATE_REBASE:
395 return "rebase";
396 case SM_UPDATE_NONE:
397 return "none";
398 case SM_UPDATE_UNSPECIFIED:
399 return NULL;
400 case SM_UPDATE_COMMAND:
401 strbuf_addf(&sb, "!%s", s->command);
402 return strbuf_detach(&sb, NULL);
403 }
404 return NULL;
405 }
406
407 void handle_ignore_submodules_arg(struct diff_options *diffopt,
408 const char *arg)
409 {
410 diffopt->flags.ignore_submodules = 0;
411 diffopt->flags.ignore_untracked_in_submodules = 0;
412 diffopt->flags.ignore_dirty_submodules = 0;
413
414 if (!strcmp(arg, "all"))
415 diffopt->flags.ignore_submodules = 1;
416 else if (!strcmp(arg, "untracked"))
417 diffopt->flags.ignore_untracked_in_submodules = 1;
418 else if (!strcmp(arg, "dirty"))
419 diffopt->flags.ignore_dirty_submodules = 1;
420 else if (strcmp(arg, "none"))
421 die("bad --ignore-submodules argument: %s", arg);
422 }
423
424 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
425 struct commit *left, struct commit *right,
426 struct commit_list *merge_bases)
427 {
428 struct commit_list *list;
429
430 init_revisions(rev, NULL);
431 setup_revisions(0, NULL, rev, NULL);
432 rev->left_right = 1;
433 rev->first_parent_only = 1;
434 left->object.flags |= SYMMETRIC_LEFT;
435 add_pending_object(rev, &left->object, path);
436 add_pending_object(rev, &right->object, path);
437 for (list = merge_bases; list; list = list->next) {
438 list->item->object.flags |= UNINTERESTING;
439 add_pending_object(rev, &list->item->object,
440 oid_to_hex(&list->item->object.oid));
441 }
442 return prepare_revision_walk(rev);
443 }
444
445 static void print_submodule_summary(struct rev_info *rev, struct diff_options *o)
446 {
447 static const char format[] = " %m %s";
448 struct strbuf sb = STRBUF_INIT;
449 struct commit *commit;
450
451 while ((commit = get_revision(rev))) {
452 struct pretty_print_context ctx = {0};
453 ctx.date_mode = rev->date_mode;
454 ctx.output_encoding = get_log_output_encoding();
455 strbuf_setlen(&sb, 0);
456 format_commit_message(commit, format, &sb, &ctx);
457 strbuf_addch(&sb, '\n');
458 if (commit->object.flags & SYMMETRIC_LEFT)
459 diff_emit_submodule_del(o, sb.buf);
460 else
461 diff_emit_submodule_add(o, sb.buf);
462 }
463 strbuf_release(&sb);
464 }
465
466 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
467 {
468 const char * const *var;
469
470 for (var = local_repo_env; *var; var++) {
471 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
472 argv_array_push(out, *var);
473 }
474 }
475
476 void prepare_submodule_repo_env(struct argv_array *out)
477 {
478 prepare_submodule_repo_env_no_git_dir(out);
479 argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
480 DEFAULT_GIT_DIR_ENVIRONMENT);
481 }
482
483 /* Helper function to display the submodule header line prior to the full
484 * summary output. If it can locate the submodule objects directory it will
485 * attempt to lookup both the left and right commits and put them into the
486 * left and right pointers.
487 */
488 static void show_submodule_header(struct diff_options *o, const char *path,
489 struct object_id *one, struct object_id *two,
490 unsigned dirty_submodule,
491 struct commit **left, struct commit **right,
492 struct commit_list **merge_bases)
493 {
494 const char *message = NULL;
495 struct strbuf sb = STRBUF_INIT;
496 int fast_forward = 0, fast_backward = 0;
497
498 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
499 diff_emit_submodule_untracked(o, path);
500
501 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
502 diff_emit_submodule_modified(o, path);
503
504 if (is_null_oid(one))
505 message = "(new submodule)";
506 else if (is_null_oid(two))
507 message = "(submodule deleted)";
508
509 if (add_submodule_odb(path)) {
510 if (!message)
511 message = "(commits not present)";
512 goto output_header;
513 }
514
515 /*
516 * Attempt to lookup the commit references, and determine if this is
517 * a fast forward or fast backwards update.
518 */
519 *left = lookup_commit_reference(one);
520 *right = lookup_commit_reference(two);
521
522 /*
523 * Warn about missing commits in the submodule project, but only if
524 * they aren't null.
525 */
526 if ((!is_null_oid(one) && !*left) ||
527 (!is_null_oid(two) && !*right))
528 message = "(commits not present)";
529
530 *merge_bases = get_merge_bases(*left, *right);
531 if (*merge_bases) {
532 if ((*merge_bases)->item == *left)
533 fast_forward = 1;
534 else if ((*merge_bases)->item == *right)
535 fast_backward = 1;
536 }
537
538 if (!oidcmp(one, two)) {
539 strbuf_release(&sb);
540 return;
541 }
542
543 output_header:
544 strbuf_addf(&sb, "Submodule %s ", path);
545 strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
546 strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
547 strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
548 if (message)
549 strbuf_addf(&sb, " %s\n", message);
550 else
551 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
552 diff_emit_submodule_header(o, sb.buf);
553
554 strbuf_release(&sb);
555 }
556
557 void show_submodule_summary(struct diff_options *o, const char *path,
558 struct object_id *one, struct object_id *two,
559 unsigned dirty_submodule)
560 {
561 struct rev_info rev;
562 struct commit *left = NULL, *right = NULL;
563 struct commit_list *merge_bases = NULL;
564
565 show_submodule_header(o, path, one, two, dirty_submodule,
566 &left, &right, &merge_bases);
567
568 /*
569 * If we don't have both a left and a right pointer, there is no
570 * reason to try and display a summary. The header line should contain
571 * all the information the user needs.
572 */
573 if (!left || !right)
574 goto out;
575
576 /* Treat revision walker failure the same as missing commits */
577 if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
578 diff_emit_submodule_error(o, "(revision walker failed)\n");
579 goto out;
580 }
581
582 print_submodule_summary(&rev, o);
583
584 out:
585 if (merge_bases)
586 free_commit_list(merge_bases);
587 clear_commit_marks(left, ~0);
588 clear_commit_marks(right, ~0);
589 }
590
591 void show_submodule_inline_diff(struct diff_options *o, const char *path,
592 struct object_id *one, struct object_id *two,
593 unsigned dirty_submodule)
594 {
595 const struct object_id *old_oid = the_hash_algo->empty_tree, *new_oid = the_hash_algo->empty_tree;
596 struct commit *left = NULL, *right = NULL;
597 struct commit_list *merge_bases = NULL;
598 struct child_process cp = CHILD_PROCESS_INIT;
599 struct strbuf sb = STRBUF_INIT;
600
601 show_submodule_header(o, path, one, two, dirty_submodule,
602 &left, &right, &merge_bases);
603
604 /* We need a valid left and right commit to display a difference */
605 if (!(left || is_null_oid(one)) ||
606 !(right || is_null_oid(two)))
607 goto done;
608
609 if (left)
610 old_oid = one;
611 if (right)
612 new_oid = two;
613
614 cp.git_cmd = 1;
615 cp.dir = path;
616 cp.out = -1;
617 cp.no_stdin = 1;
618
619 /* TODO: other options may need to be passed here. */
620 argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
621 argv_array_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
622 "always" : "never");
623
624 if (o->flags.reverse_diff) {
625 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
626 o->b_prefix, path);
627 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
628 o->a_prefix, path);
629 } else {
630 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
631 o->a_prefix, path);
632 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
633 o->b_prefix, path);
634 }
635 argv_array_push(&cp.args, oid_to_hex(old_oid));
636 /*
637 * If the submodule has modified content, we will diff against the
638 * work tree, under the assumption that the user has asked for the
639 * diff format and wishes to actually see all differences even if they
640 * haven't yet been committed to the submodule yet.
641 */
642 if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
643 argv_array_push(&cp.args, oid_to_hex(new_oid));
644
645 prepare_submodule_repo_env(&cp.env_array);
646 if (start_command(&cp))
647 diff_emit_submodule_error(o, "(diff failed)\n");
648
649 while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
650 diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
651
652 if (finish_command(&cp))
653 diff_emit_submodule_error(o, "(diff failed)\n");
654
655 done:
656 strbuf_release(&sb);
657 if (merge_bases)
658 free_commit_list(merge_bases);
659 if (left)
660 clear_commit_marks(left, ~0);
661 if (right)
662 clear_commit_marks(right, ~0);
663 }
664
665 int should_update_submodules(void)
666 {
667 return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
668 }
669
670 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
671 {
672 if (!S_ISGITLINK(ce->ce_mode))
673 return NULL;
674
675 if (!should_update_submodules())
676 return NULL;
677
678 return submodule_from_path(the_repository, &null_oid, ce->name);
679 }
680
681 static struct oid_array *submodule_commits(struct string_list *submodules,
682 const char *name)
683 {
684 struct string_list_item *item;
685
686 item = string_list_insert(submodules, name);
687 if (item->util)
688 return (struct oid_array *) item->util;
689
690 /* NEEDSWORK: should we have oid_array_init()? */
691 item->util = xcalloc(1, sizeof(struct oid_array));
692 return (struct oid_array *) item->util;
693 }
694
695 struct collect_changed_submodules_cb_data {
696 struct string_list *changed;
697 const struct object_id *commit_oid;
698 };
699
700 /*
701 * this would normally be two functions: default_name_from_path() and
702 * path_from_default_name(). Since the default name is the same as
703 * the submodule path we can get away with just one function which only
704 * checks whether there is a submodule in the working directory at that
705 * location.
706 */
707 static const char *default_name_or_path(const char *path_or_name)
708 {
709 int error_code;
710
711 if (!is_submodule_populated_gently(path_or_name, &error_code))
712 return NULL;
713
714 return path_or_name;
715 }
716
717 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
718 struct diff_options *options,
719 void *data)
720 {
721 struct collect_changed_submodules_cb_data *me = data;
722 struct string_list *changed = me->changed;
723 const struct object_id *commit_oid = me->commit_oid;
724 int i;
725
726 for (i = 0; i < q->nr; i++) {
727 struct diff_filepair *p = q->queue[i];
728 struct oid_array *commits;
729 const struct submodule *submodule;
730 const char *name;
731
732 if (!S_ISGITLINK(p->two->mode))
733 continue;
734
735 submodule = submodule_from_path(the_repository,
736 commit_oid, p->two->path);
737 if (submodule)
738 name = submodule->name;
739 else {
740 name = default_name_or_path(p->two->path);
741 /* make sure name does not collide with existing one */
742 submodule = submodule_from_name(the_repository, commit_oid, name);
743 if (submodule) {
744 warning("Submodule in commit %s at path: "
745 "'%s' collides with a submodule named "
746 "the same. Skipping it.",
747 oid_to_hex(commit_oid), name);
748 name = NULL;
749 }
750 }
751
752 if (!name)
753 continue;
754
755 commits = submodule_commits(changed, name);
756 oid_array_append(commits, &p->two->oid);
757 }
758 }
759
760 /*
761 * Collect the paths of submodules in 'changed' which have changed based on
762 * the revisions as specified in 'argv'. Each entry in 'changed' will also
763 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
764 * what the submodule pointers were updated to during the change.
765 */
766 static void collect_changed_submodules(struct string_list *changed,
767 struct argv_array *argv)
768 {
769 struct rev_info rev;
770 const struct commit *commit;
771
772 init_revisions(&rev, NULL);
773 setup_revisions(argv->argc, argv->argv, &rev, NULL);
774 if (prepare_revision_walk(&rev))
775 die("revision walk setup failed");
776
777 while ((commit = get_revision(&rev))) {
778 struct rev_info diff_rev;
779 struct collect_changed_submodules_cb_data data;
780 data.changed = changed;
781 data.commit_oid = &commit->object.oid;
782
783 init_revisions(&diff_rev, NULL);
784 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
785 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
786 diff_rev.diffopt.format_callback_data = &data;
787 diff_tree_combined_merge(commit, 1, &diff_rev);
788 }
789
790 reset_revision_walk();
791 }
792
793 static void free_submodules_oids(struct string_list *submodules)
794 {
795 struct string_list_item *item;
796 for_each_string_list_item(item, submodules)
797 oid_array_clear((struct oid_array *) item->util);
798 string_list_clear(submodules, 1);
799 }
800
801 static int has_remote(const char *refname, const struct object_id *oid,
802 int flags, void *cb_data)
803 {
804 return 1;
805 }
806
807 static int append_oid_to_argv(const struct object_id *oid, void *data)
808 {
809 struct argv_array *argv = data;
810 argv_array_push(argv, oid_to_hex(oid));
811 return 0;
812 }
813
814 struct has_commit_data {
815 int result;
816 const char *path;
817 };
818
819 static int check_has_commit(const struct object_id *oid, void *data)
820 {
821 struct has_commit_data *cb = data;
822
823 enum object_type type = oid_object_info(the_repository, oid, NULL);
824
825 switch (type) {
826 case OBJ_COMMIT:
827 return 0;
828 case OBJ_BAD:
829 /*
830 * Object is missing or invalid. If invalid, an error message
831 * has already been printed.
832 */
833 cb->result = 0;
834 return 0;
835 default:
836 die(_("submodule entry '%s' (%s) is a %s, not a commit"),
837 cb->path, oid_to_hex(oid), type_name(type));
838 }
839 }
840
841 static int submodule_has_commits(const char *path, struct oid_array *commits)
842 {
843 struct has_commit_data has_commit = { 1, path };
844
845 /*
846 * Perform a cheap, but incorrect check for the existence of 'commits'.
847 * This is done by adding the submodule's object store to the in-core
848 * object store, and then querying for each commit's existence. If we
849 * do not have the commit object anywhere, there is no chance we have
850 * it in the object store of the correct submodule and have it
851 * reachable from a ref, so we can fail early without spawning rev-list
852 * which is expensive.
853 */
854 if (add_submodule_odb(path))
855 return 0;
856
857 oid_array_for_each_unique(commits, check_has_commit, &has_commit);
858
859 if (has_commit.result) {
860 /*
861 * Even if the submodule is checked out and the commit is
862 * present, make sure it exists in the submodule's object store
863 * and that it is reachable from a ref.
864 */
865 struct child_process cp = CHILD_PROCESS_INIT;
866 struct strbuf out = STRBUF_INIT;
867
868 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
869 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
870 argv_array_pushl(&cp.args, "--not", "--all", NULL);
871
872 prepare_submodule_repo_env(&cp.env_array);
873 cp.git_cmd = 1;
874 cp.no_stdin = 1;
875 cp.dir = path;
876
877 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
878 has_commit.result = 0;
879
880 strbuf_release(&out);
881 }
882
883 return has_commit.result;
884 }
885
886 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
887 {
888 if (!submodule_has_commits(path, commits))
889 /*
890 * NOTE: We do consider it safe to return "no" here. The
891 * correct answer would be "We do not know" instead of
892 * "No push needed", but it is quite hard to change
893 * the submodule pointer without having the submodule
894 * around. If a user did however change the submodules
895 * without having the submodule around, this indicates
896 * an expert who knows what they are doing or a
897 * maintainer integrating work from other people. In
898 * both cases it should be safe to skip this check.
899 */
900 return 0;
901
902 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
903 struct child_process cp = CHILD_PROCESS_INIT;
904 struct strbuf buf = STRBUF_INIT;
905 int needs_pushing = 0;
906
907 argv_array_push(&cp.args, "rev-list");
908 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
909 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
910
911 prepare_submodule_repo_env(&cp.env_array);
912 cp.git_cmd = 1;
913 cp.no_stdin = 1;
914 cp.out = -1;
915 cp.dir = path;
916 if (start_command(&cp))
917 die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
918 path);
919 if (strbuf_read(&buf, cp.out, 41))
920 needs_pushing = 1;
921 finish_command(&cp);
922 close(cp.out);
923 strbuf_release(&buf);
924 return needs_pushing;
925 }
926
927 return 0;
928 }
929
930 int find_unpushed_submodules(struct oid_array *commits,
931 const char *remotes_name, struct string_list *needs_pushing)
932 {
933 struct string_list submodules = STRING_LIST_INIT_DUP;
934 struct string_list_item *name;
935 struct argv_array argv = ARGV_ARRAY_INIT;
936
937 /* argv.argv[0] will be ignored by setup_revisions */
938 argv_array_push(&argv, "find_unpushed_submodules");
939 oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
940 argv_array_push(&argv, "--not");
941 argv_array_pushf(&argv, "--remotes=%s", remotes_name);
942
943 collect_changed_submodules(&submodules, &argv);
944
945 for_each_string_list_item(name, &submodules) {
946 struct oid_array *commits = name->util;
947 const struct submodule *submodule;
948 const char *path = NULL;
949
950 submodule = submodule_from_name(the_repository, &null_oid, name->string);
951 if (submodule)
952 path = submodule->path;
953 else
954 path = default_name_or_path(name->string);
955
956 if (!path)
957 continue;
958
959 if (submodule_needs_pushing(path, commits))
960 string_list_insert(needs_pushing, path);
961 }
962
963 free_submodules_oids(&submodules);
964 argv_array_clear(&argv);
965
966 return needs_pushing->nr;
967 }
968
969 static int push_submodule(const char *path,
970 const struct remote *remote,
971 const char **refspec, int refspec_nr,
972 const struct string_list *push_options,
973 int dry_run)
974 {
975 if (add_submodule_odb(path))
976 return 1;
977
978 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
979 struct child_process cp = CHILD_PROCESS_INIT;
980 argv_array_push(&cp.args, "push");
981 if (dry_run)
982 argv_array_push(&cp.args, "--dry-run");
983
984 if (push_options && push_options->nr) {
985 const struct string_list_item *item;
986 for_each_string_list_item(item, push_options)
987 argv_array_pushf(&cp.args, "--push-option=%s",
988 item->string);
989 }
990
991 if (remote->origin != REMOTE_UNCONFIGURED) {
992 int i;
993 argv_array_push(&cp.args, remote->name);
994 for (i = 0; i < refspec_nr; i++)
995 argv_array_push(&cp.args, refspec[i]);
996 }
997
998 prepare_submodule_repo_env(&cp.env_array);
999 cp.git_cmd = 1;
1000 cp.no_stdin = 1;
1001 cp.dir = path;
1002 if (run_command(&cp))
1003 return 0;
1004 close(cp.out);
1005 }
1006
1007 return 1;
1008 }
1009
1010 /*
1011 * Perform a check in the submodule to see if the remote and refspec work.
1012 * Die if the submodule can't be pushed.
1013 */
1014 static void submodule_push_check(const char *path, const char *head,
1015 const struct remote *remote,
1016 const char **refspec, int refspec_nr)
1017 {
1018 struct child_process cp = CHILD_PROCESS_INIT;
1019 int i;
1020
1021 argv_array_push(&cp.args, "submodule--helper");
1022 argv_array_push(&cp.args, "push-check");
1023 argv_array_push(&cp.args, head);
1024 argv_array_push(&cp.args, remote->name);
1025
1026 for (i = 0; i < refspec_nr; i++)
1027 argv_array_push(&cp.args, refspec[i]);
1028
1029 prepare_submodule_repo_env(&cp.env_array);
1030 cp.git_cmd = 1;
1031 cp.no_stdin = 1;
1032 cp.no_stdout = 1;
1033 cp.dir = path;
1034
1035 /*
1036 * Simply indicate if 'submodule--helper push-check' failed.
1037 * More detailed error information will be provided by the
1038 * child process.
1039 */
1040 if (run_command(&cp))
1041 die("process for submodule '%s' failed", path);
1042 }
1043
1044 int push_unpushed_submodules(struct oid_array *commits,
1045 const struct remote *remote,
1046 const char **refspec, int refspec_nr,
1047 const struct string_list *push_options,
1048 int dry_run)
1049 {
1050 int i, ret = 1;
1051 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1052
1053 if (!find_unpushed_submodules(commits, remote->name, &needs_pushing))
1054 return 1;
1055
1056 /*
1057 * Verify that the remote and refspec can be propagated to all
1058 * submodules. This check can be skipped if the remote and refspec
1059 * won't be propagated due to the remote being unconfigured (e.g. a URL
1060 * instead of a remote name).
1061 */
1062 if (remote->origin != REMOTE_UNCONFIGURED) {
1063 char *head;
1064 struct object_id head_oid;
1065
1066 head = resolve_refdup("HEAD", 0, &head_oid, NULL);
1067 if (!head)
1068 die(_("Failed to resolve HEAD as a valid ref."));
1069
1070 for (i = 0; i < needs_pushing.nr; i++)
1071 submodule_push_check(needs_pushing.items[i].string,
1072 head, remote,
1073 refspec, refspec_nr);
1074 free(head);
1075 }
1076
1077 /* Actually push the submodules */
1078 for (i = 0; i < needs_pushing.nr; i++) {
1079 const char *path = needs_pushing.items[i].string;
1080 fprintf(stderr, "Pushing submodule '%s'\n", path);
1081 if (!push_submodule(path, remote, refspec, refspec_nr,
1082 push_options, dry_run)) {
1083 fprintf(stderr, "Unable to push submodule '%s'\n", path);
1084 ret = 0;
1085 }
1086 }
1087
1088 string_list_clear(&needs_pushing, 0);
1089
1090 return ret;
1091 }
1092
1093 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1094 int flags, void *data)
1095 {
1096 struct oid_array *array = data;
1097 oid_array_append(array, oid);
1098 return 0;
1099 }
1100
1101 void check_for_new_submodule_commits(struct object_id *oid)
1102 {
1103 if (!initialized_fetch_ref_tips) {
1104 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1105 initialized_fetch_ref_tips = 1;
1106 }
1107
1108 oid_array_append(&ref_tips_after_fetch, oid);
1109 }
1110
1111 static void calculate_changed_submodule_paths(void)
1112 {
1113 struct argv_array argv = ARGV_ARRAY_INIT;
1114 struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1115 const struct string_list_item *name;
1116
1117 /* No need to check if there are no submodules configured */
1118 if (!submodule_from_path(the_repository, NULL, NULL))
1119 return;
1120
1121 argv_array_push(&argv, "--"); /* argv[0] program name */
1122 oid_array_for_each_unique(&ref_tips_after_fetch,
1123 append_oid_to_argv, &argv);
1124 argv_array_push(&argv, "--not");
1125 oid_array_for_each_unique(&ref_tips_before_fetch,
1126 append_oid_to_argv, &argv);
1127
1128 /*
1129 * Collect all submodules (whether checked out or not) for which new
1130 * commits have been recorded upstream in "changed_submodule_names".
1131 */
1132 collect_changed_submodules(&changed_submodules, &argv);
1133
1134 for_each_string_list_item(name, &changed_submodules) {
1135 struct oid_array *commits = name->util;
1136 const struct submodule *submodule;
1137 const char *path = NULL;
1138
1139 submodule = submodule_from_name(the_repository, &null_oid, name->string);
1140 if (submodule)
1141 path = submodule->path;
1142 else
1143 path = default_name_or_path(name->string);
1144
1145 if (!path)
1146 continue;
1147
1148 if (!submodule_has_commits(path, commits))
1149 string_list_append(&changed_submodule_names, name->string);
1150 }
1151
1152 free_submodules_oids(&changed_submodules);
1153 argv_array_clear(&argv);
1154 oid_array_clear(&ref_tips_before_fetch);
1155 oid_array_clear(&ref_tips_after_fetch);
1156 initialized_fetch_ref_tips = 0;
1157 }
1158
1159 int submodule_touches_in_range(struct object_id *excl_oid,
1160 struct object_id *incl_oid)
1161 {
1162 struct string_list subs = STRING_LIST_INIT_DUP;
1163 struct argv_array args = ARGV_ARRAY_INIT;
1164 int ret;
1165
1166 /* No need to check if there are no submodules configured */
1167 if (!submodule_from_path(the_repository, NULL, NULL))
1168 return 0;
1169
1170 argv_array_push(&args, "--"); /* args[0] program name */
1171 argv_array_push(&args, oid_to_hex(incl_oid));
1172 argv_array_push(&args, "--not");
1173 argv_array_push(&args, oid_to_hex(excl_oid));
1174
1175 collect_changed_submodules(&subs, &args);
1176 ret = subs.nr;
1177
1178 argv_array_clear(&args);
1179
1180 free_submodules_oids(&subs);
1181 return ret;
1182 }
1183
1184 struct submodule_parallel_fetch {
1185 int count;
1186 struct argv_array args;
1187 struct repository *r;
1188 const char *prefix;
1189 int command_line_option;
1190 int default_option;
1191 int quiet;
1192 int result;
1193 };
1194 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}
1195
1196 static int get_fetch_recurse_config(const struct submodule *submodule,
1197 struct submodule_parallel_fetch *spf)
1198 {
1199 if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
1200 return spf->command_line_option;
1201
1202 if (submodule) {
1203 char *key;
1204 const char *value;
1205
1206 int fetch_recurse = submodule->fetch_recurse;
1207 key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
1208 if (!repo_config_get_string_const(spf->r, key, &value)) {
1209 fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
1210 }
1211 free(key);
1212
1213 if (fetch_recurse != RECURSE_SUBMODULES_NONE)
1214 /* local config overrules everything except commandline */
1215 return fetch_recurse;
1216 }
1217
1218 return spf->default_option;
1219 }
1220
1221 static int get_next_submodule(struct child_process *cp,
1222 struct strbuf *err, void *data, void **task_cb)
1223 {
1224 int ret = 0;
1225 struct submodule_parallel_fetch *spf = data;
1226
1227 for (; spf->count < spf->r->index->cache_nr; spf->count++) {
1228 struct strbuf submodule_path = STRBUF_INIT;
1229 struct strbuf submodule_git_dir = STRBUF_INIT;
1230 struct strbuf submodule_prefix = STRBUF_INIT;
1231 const struct cache_entry *ce = spf->r->index->cache[spf->count];
1232 const char *git_dir, *default_argv;
1233 const struct submodule *submodule;
1234 struct submodule default_submodule = SUBMODULE_INIT;
1235
1236 if (!S_ISGITLINK(ce->ce_mode))
1237 continue;
1238
1239 submodule = submodule_from_path(spf->r, &null_oid, ce->name);
1240 if (!submodule) {
1241 const char *name = default_name_or_path(ce->name);
1242 if (name) {
1243 default_submodule.path = default_submodule.name = name;
1244 submodule = &default_submodule;
1245 }
1246 }
1247
1248 switch (get_fetch_recurse_config(submodule, spf))
1249 {
1250 default:
1251 case RECURSE_SUBMODULES_DEFAULT:
1252 case RECURSE_SUBMODULES_ON_DEMAND:
1253 if (!submodule || !unsorted_string_list_lookup(&changed_submodule_names,
1254 submodule->name))
1255 continue;
1256 default_argv = "on-demand";
1257 break;
1258 case RECURSE_SUBMODULES_ON:
1259 default_argv = "yes";
1260 break;
1261 case RECURSE_SUBMODULES_OFF:
1262 continue;
1263 }
1264
1265 strbuf_repo_worktree_path(&submodule_path, spf->r, "%s", ce->name);
1266 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1267 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1268 git_dir = read_gitfile(submodule_git_dir.buf);
1269 if (!git_dir)
1270 git_dir = submodule_git_dir.buf;
1271 if (is_directory(git_dir)) {
1272 child_process_init(cp);
1273 cp->dir = strbuf_detach(&submodule_path, NULL);
1274 prepare_submodule_repo_env(&cp->env_array);
1275 cp->git_cmd = 1;
1276 if (!spf->quiet)
1277 strbuf_addf(err, "Fetching submodule %s%s\n",
1278 spf->prefix, ce->name);
1279 argv_array_init(&cp->args);
1280 argv_array_pushv(&cp->args, spf->args.argv);
1281 argv_array_push(&cp->args, default_argv);
1282 argv_array_push(&cp->args, "--submodule-prefix");
1283 argv_array_push(&cp->args, submodule_prefix.buf);
1284 ret = 1;
1285 }
1286 strbuf_release(&submodule_path);
1287 strbuf_release(&submodule_git_dir);
1288 strbuf_release(&submodule_prefix);
1289 if (ret) {
1290 spf->count++;
1291 return 1;
1292 }
1293 }
1294 return 0;
1295 }
1296
1297 static int fetch_start_failure(struct strbuf *err,
1298 void *cb, void *task_cb)
1299 {
1300 struct submodule_parallel_fetch *spf = cb;
1301
1302 spf->result = 1;
1303
1304 return 0;
1305 }
1306
1307 static int fetch_finish(int retvalue, struct strbuf *err,
1308 void *cb, void *task_cb)
1309 {
1310 struct submodule_parallel_fetch *spf = cb;
1311
1312 if (retvalue)
1313 spf->result = 1;
1314
1315 return 0;
1316 }
1317
1318 int fetch_populated_submodules(struct repository *r,
1319 const struct argv_array *options,
1320 const char *prefix, int command_line_option,
1321 int default_option,
1322 int quiet, int max_parallel_jobs)
1323 {
1324 int i;
1325 struct submodule_parallel_fetch spf = SPF_INIT;
1326
1327 spf.r = r;
1328 spf.command_line_option = command_line_option;
1329 spf.default_option = default_option;
1330 spf.quiet = quiet;
1331 spf.prefix = prefix;
1332
1333 if (!r->worktree)
1334 goto out;
1335
1336 if (repo_read_index(r) < 0)
1337 die("index file corrupt");
1338
1339 argv_array_push(&spf.args, "fetch");
1340 for (i = 0; i < options->argc; i++)
1341 argv_array_push(&spf.args, options->argv[i]);
1342 argv_array_push(&spf.args, "--recurse-submodules-default");
1343 /* default value, "--submodule-prefix" and its value are added later */
1344
1345 calculate_changed_submodule_paths();
1346 run_processes_parallel(max_parallel_jobs,
1347 get_next_submodule,
1348 fetch_start_failure,
1349 fetch_finish,
1350 &spf);
1351
1352 argv_array_clear(&spf.args);
1353 out:
1354 string_list_clear(&changed_submodule_names, 1);
1355 return spf.result;
1356 }
1357
1358 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1359 {
1360 struct child_process cp = CHILD_PROCESS_INIT;
1361 struct strbuf buf = STRBUF_INIT;
1362 FILE *fp;
1363 unsigned dirty_submodule = 0;
1364 const char *git_dir;
1365 int ignore_cp_exit_code = 0;
1366
1367 strbuf_addf(&buf, "%s/.git", path);
1368 git_dir = read_gitfile(buf.buf);
1369 if (!git_dir)
1370 git_dir = buf.buf;
1371 if (!is_git_directory(git_dir)) {
1372 if (is_directory(git_dir))
1373 die(_("'%s' not recognized as a git repository"), git_dir);
1374 strbuf_release(&buf);
1375 /* The submodule is not checked out, so it is not modified */
1376 return 0;
1377 }
1378 strbuf_reset(&buf);
1379
1380 argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1381 if (ignore_untracked)
1382 argv_array_push(&cp.args, "-uno");
1383
1384 prepare_submodule_repo_env(&cp.env_array);
1385 cp.git_cmd = 1;
1386 cp.no_stdin = 1;
1387 cp.out = -1;
1388 cp.dir = path;
1389 if (start_command(&cp))
1390 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1391
1392 fp = xfdopen(cp.out, "r");
1393 while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1394 /* regular untracked files */
1395 if (buf.buf[0] == '?')
1396 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1397
1398 if (buf.buf[0] == 'u' ||
1399 buf.buf[0] == '1' ||
1400 buf.buf[0] == '2') {
1401 /* T = line type, XY = status, SSSS = submodule state */
1402 if (buf.len < strlen("T XY SSSS"))
1403 BUG("invalid status --porcelain=2 line %s",
1404 buf.buf);
1405
1406 if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1407 /* nested untracked file */
1408 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1409
1410 if (buf.buf[0] == 'u' ||
1411 buf.buf[0] == '2' ||
1412 memcmp(buf.buf + 5, "S..U", 4))
1413 /* other change */
1414 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1415 }
1416
1417 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1418 ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1419 ignore_untracked)) {
1420 /*
1421 * We're not interested in any further information from
1422 * the child any more, neither output nor its exit code.
1423 */
1424 ignore_cp_exit_code = 1;
1425 break;
1426 }
1427 }
1428 fclose(fp);
1429
1430 if (finish_command(&cp) && !ignore_cp_exit_code)
1431 die("'git status --porcelain=2' failed in submodule %s", path);
1432
1433 strbuf_release(&buf);
1434 return dirty_submodule;
1435 }
1436
1437 int submodule_uses_gitfile(const char *path)
1438 {
1439 struct child_process cp = CHILD_PROCESS_INIT;
1440 const char *argv[] = {
1441 "submodule",
1442 "foreach",
1443 "--quiet",
1444 "--recursive",
1445 "test -f .git",
1446 NULL,
1447 };
1448 struct strbuf buf = STRBUF_INIT;
1449 const char *git_dir;
1450
1451 strbuf_addf(&buf, "%s/.git", path);
1452 git_dir = read_gitfile(buf.buf);
1453 if (!git_dir) {
1454 strbuf_release(&buf);
1455 return 0;
1456 }
1457 strbuf_release(&buf);
1458
1459 /* Now test that all nested submodules use a gitfile too */
1460 cp.argv = argv;
1461 prepare_submodule_repo_env(&cp.env_array);
1462 cp.git_cmd = 1;
1463 cp.no_stdin = 1;
1464 cp.no_stderr = 1;
1465 cp.no_stdout = 1;
1466 cp.dir = path;
1467 if (run_command(&cp))
1468 return 0;
1469
1470 return 1;
1471 }
1472
1473 /*
1474 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1475 * when doing so.
1476 *
1477 * Return 1 if we'd lose data, return 0 if the removal is fine,
1478 * and negative values for errors.
1479 */
1480 int bad_to_remove_submodule(const char *path, unsigned flags)
1481 {
1482 ssize_t len;
1483 struct child_process cp = CHILD_PROCESS_INIT;
1484 struct strbuf buf = STRBUF_INIT;
1485 int ret = 0;
1486
1487 if (!file_exists(path) || is_empty_dir(path))
1488 return 0;
1489
1490 if (!submodule_uses_gitfile(path))
1491 return 1;
1492
1493 argv_array_pushl(&cp.args, "status", "--porcelain",
1494 "--ignore-submodules=none", NULL);
1495
1496 if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1497 argv_array_push(&cp.args, "-uno");
1498 else
1499 argv_array_push(&cp.args, "-uall");
1500
1501 if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1502 argv_array_push(&cp.args, "--ignored");
1503
1504 prepare_submodule_repo_env(&cp.env_array);
1505 cp.git_cmd = 1;
1506 cp.no_stdin = 1;
1507 cp.out = -1;
1508 cp.dir = path;
1509 if (start_command(&cp)) {
1510 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1511 die(_("could not start 'git status' in submodule '%s'"),
1512 path);
1513 ret = -1;
1514 goto out;
1515 }
1516
1517 len = strbuf_read(&buf, cp.out, 1024);
1518 if (len > 2)
1519 ret = 1;
1520 close(cp.out);
1521
1522 if (finish_command(&cp)) {
1523 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1524 die(_("could not run 'git status' in submodule '%s'"),
1525 path);
1526 ret = -1;
1527 }
1528 out:
1529 strbuf_release(&buf);
1530 return ret;
1531 }
1532
1533 static const char *get_super_prefix_or_empty(void)
1534 {
1535 const char *s = get_super_prefix();
1536 if (!s)
1537 s = "";
1538 return s;
1539 }
1540
1541 static int submodule_has_dirty_index(const struct submodule *sub)
1542 {
1543 struct child_process cp = CHILD_PROCESS_INIT;
1544
1545 prepare_submodule_repo_env(&cp.env_array);
1546
1547 cp.git_cmd = 1;
1548 argv_array_pushl(&cp.args, "diff-index", "--quiet",
1549 "--cached", "HEAD", NULL);
1550 cp.no_stdin = 1;
1551 cp.no_stdout = 1;
1552 cp.dir = sub->path;
1553 if (start_command(&cp))
1554 die("could not recurse into submodule '%s'", sub->path);
1555
1556 return finish_command(&cp);
1557 }
1558
1559 static void submodule_reset_index(const char *path)
1560 {
1561 struct child_process cp = CHILD_PROCESS_INIT;
1562 prepare_submodule_repo_env(&cp.env_array);
1563
1564 cp.git_cmd = 1;
1565 cp.no_stdin = 1;
1566 cp.dir = path;
1567
1568 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1569 get_super_prefix_or_empty(), path);
1570 argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1571
1572 argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1573
1574 if (run_command(&cp))
1575 die("could not reset submodule index");
1576 }
1577
1578 /**
1579 * Moves a submodule at a given path from a given head to another new head.
1580 * For edge cases (a submodule coming into existence or removing a submodule)
1581 * pass NULL for old or new respectively.
1582 */
1583 int submodule_move_head(const char *path,
1584 const char *old_head,
1585 const char *new_head,
1586 unsigned flags)
1587 {
1588 int ret = 0;
1589 struct child_process cp = CHILD_PROCESS_INIT;
1590 const struct submodule *sub;
1591 int *error_code_ptr, error_code;
1592
1593 if (!is_submodule_active(the_repository, path))
1594 return 0;
1595
1596 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1597 /*
1598 * Pass non NULL pointer to is_submodule_populated_gently
1599 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1600 * to fixup the submodule in the force case later.
1601 */
1602 error_code_ptr = &error_code;
1603 else
1604 error_code_ptr = NULL;
1605
1606 if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
1607 return 0;
1608
1609 sub = submodule_from_path(the_repository, &null_oid, path);
1610
1611 if (!sub)
1612 BUG("could not get submodule information for '%s'", path);
1613
1614 if (old_head && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1615 /* Check if the submodule has a dirty index. */
1616 if (submodule_has_dirty_index(sub))
1617 return error(_("submodule '%s' has dirty index"), path);
1618 }
1619
1620 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1621 if (old_head) {
1622 if (!submodule_uses_gitfile(path))
1623 absorb_git_dir_into_superproject("", path,
1624 ABSORB_GITDIR_RECURSE_SUBMODULES);
1625 } else {
1626 char *gitdir = xstrfmt("%s/modules/%s",
1627 get_git_common_dir(), sub->name);
1628 connect_work_tree_and_git_dir(path, gitdir, 0);
1629 free(gitdir);
1630
1631 /* make sure the index is clean as well */
1632 submodule_reset_index(path);
1633 }
1634
1635 if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1636 char *gitdir = xstrfmt("%s/modules/%s",
1637 get_git_common_dir(), sub->name);
1638 connect_work_tree_and_git_dir(path, gitdir, 1);
1639 free(gitdir);
1640 }
1641 }
1642
1643 prepare_submodule_repo_env(&cp.env_array);
1644
1645 cp.git_cmd = 1;
1646 cp.no_stdin = 1;
1647 cp.dir = path;
1648
1649 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1650 get_super_prefix_or_empty(), path);
1651 argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1652
1653 if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1654 argv_array_push(&cp.args, "-n");
1655 else
1656 argv_array_push(&cp.args, "-u");
1657
1658 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1659 argv_array_push(&cp.args, "--reset");
1660 else
1661 argv_array_push(&cp.args, "-m");
1662
1663 if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
1664 argv_array_push(&cp.args, old_head ? old_head : EMPTY_TREE_SHA1_HEX);
1665
1666 argv_array_push(&cp.args, new_head ? new_head : EMPTY_TREE_SHA1_HEX);
1667
1668 if (run_command(&cp)) {
1669 ret = -1;
1670 goto out;
1671 }
1672
1673 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1674 if (new_head) {
1675 child_process_init(&cp);
1676 /* also set the HEAD accordingly */
1677 cp.git_cmd = 1;
1678 cp.no_stdin = 1;
1679 cp.dir = path;
1680
1681 prepare_submodule_repo_env(&cp.env_array);
1682 argv_array_pushl(&cp.args, "update-ref", "HEAD",
1683 "--no-deref", new_head, NULL);
1684
1685 if (run_command(&cp)) {
1686 ret = -1;
1687 goto out;
1688 }
1689 } else {
1690 struct strbuf sb = STRBUF_INIT;
1691
1692 strbuf_addf(&sb, "%s/.git", path);
1693 unlink_or_warn(sb.buf);
1694 strbuf_release(&sb);
1695
1696 if (is_empty_dir(path))
1697 rmdir_or_warn(path);
1698 }
1699 }
1700 out:
1701 return ret;
1702 }
1703
1704 static int find_first_merges(struct object_array *result, const char *path,
1705 struct commit *a, struct commit *b)
1706 {
1707 int i, j;
1708 struct object_array merges = OBJECT_ARRAY_INIT;
1709 struct commit *commit;
1710 int contains_another;
1711
1712 char merged_revision[42];
1713 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1714 "--all", merged_revision, NULL };
1715 struct rev_info revs;
1716 struct setup_revision_opt rev_opts;
1717
1718 memset(result, 0, sizeof(struct object_array));
1719 memset(&rev_opts, 0, sizeof(rev_opts));
1720
1721 /* get all revisions that merge commit a */
1722 xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1723 oid_to_hex(&a->object.oid));
1724 init_revisions(&revs, NULL);
1725 rev_opts.submodule = path;
1726 /* FIXME: can't handle linked worktrees in submodules yet */
1727 revs.single_worktree = path != NULL;
1728 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1729
1730 /* save all revisions from the above list that contain b */
1731 if (prepare_revision_walk(&revs))
1732 die("revision walk setup failed");
1733 while ((commit = get_revision(&revs)) != NULL) {
1734 struct object *o = &(commit->object);
1735 if (in_merge_bases(b, commit))
1736 add_object_array(o, NULL, &merges);
1737 }
1738 reset_revision_walk();
1739
1740 /* Now we've got all merges that contain a and b. Prune all
1741 * merges that contain another found merge and save them in
1742 * result.
1743 */
1744 for (i = 0; i < merges.nr; i++) {
1745 struct commit *m1 = (struct commit *) merges.objects[i].item;
1746
1747 contains_another = 0;
1748 for (j = 0; j < merges.nr; j++) {
1749 struct commit *m2 = (struct commit *) merges.objects[j].item;
1750 if (i != j && in_merge_bases(m2, m1)) {
1751 contains_another = 1;
1752 break;
1753 }
1754 }
1755
1756 if (!contains_another)
1757 add_object_array(merges.objects[i].item, NULL, result);
1758 }
1759
1760 object_array_clear(&merges);
1761 return result->nr;
1762 }
1763
1764 static void print_commit(struct commit *commit)
1765 {
1766 struct strbuf sb = STRBUF_INIT;
1767 struct pretty_print_context ctx = {0};
1768 ctx.date_mode.type = DATE_NORMAL;
1769 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1770 fprintf(stderr, "%s\n", sb.buf);
1771 strbuf_release(&sb);
1772 }
1773
1774 #define MERGE_WARNING(path, msg) \
1775 warning("Failed to merge submodule %s (%s)", path, msg);
1776
1777 int merge_submodule(struct object_id *result, const char *path,
1778 const struct object_id *base, const struct object_id *a,
1779 const struct object_id *b, int search)
1780 {
1781 struct commit *commit_base, *commit_a, *commit_b;
1782 int parent_count;
1783 struct object_array merges;
1784
1785 int i;
1786
1787 /* store a in result in case we fail */
1788 oidcpy(result, a);
1789
1790 /* we can not handle deletion conflicts */
1791 if (is_null_oid(base))
1792 return 0;
1793 if (is_null_oid(a))
1794 return 0;
1795 if (is_null_oid(b))
1796 return 0;
1797
1798 if (add_submodule_odb(path)) {
1799 MERGE_WARNING(path, "not checked out");
1800 return 0;
1801 }
1802
1803 if (!(commit_base = lookup_commit_reference(base)) ||
1804 !(commit_a = lookup_commit_reference(a)) ||
1805 !(commit_b = lookup_commit_reference(b))) {
1806 MERGE_WARNING(path, "commits not present");
1807 return 0;
1808 }
1809
1810 /* check whether both changes are forward */
1811 if (!in_merge_bases(commit_base, commit_a) ||
1812 !in_merge_bases(commit_base, commit_b)) {
1813 MERGE_WARNING(path, "commits don't follow merge-base");
1814 return 0;
1815 }
1816
1817 /* Case #1: a is contained in b or vice versa */
1818 if (in_merge_bases(commit_a, commit_b)) {
1819 oidcpy(result, b);
1820 return 1;
1821 }
1822 if (in_merge_bases(commit_b, commit_a)) {
1823 oidcpy(result, a);
1824 return 1;
1825 }
1826
1827 /*
1828 * Case #2: There are one or more merges that contain a and b in
1829 * the submodule. If there is only one, then present it as a
1830 * suggestion to the user, but leave it marked unmerged so the
1831 * user needs to confirm the resolution.
1832 */
1833
1834 /* Skip the search if makes no sense to the calling context. */
1835 if (!search)
1836 return 0;
1837
1838 /* find commit which merges them */
1839 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1840 switch (parent_count) {
1841 case 0:
1842 MERGE_WARNING(path, "merge following commits not found");
1843 break;
1844
1845 case 1:
1846 MERGE_WARNING(path, "not fast-forward");
1847 fprintf(stderr, "Found a possible merge resolution "
1848 "for the submodule:\n");
1849 print_commit((struct commit *) merges.objects[0].item);
1850 fprintf(stderr,
1851 "If this is correct simply add it to the index "
1852 "for example\n"
1853 "by using:\n\n"
1854 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1855 "which will accept this suggestion.\n",
1856 oid_to_hex(&merges.objects[0].item->oid), path);
1857 break;
1858
1859 default:
1860 MERGE_WARNING(path, "multiple merges found");
1861 for (i = 0; i < merges.nr; i++)
1862 print_commit((struct commit *) merges.objects[i].item);
1863 }
1864
1865 object_array_clear(&merges);
1866 return 0;
1867 }
1868
1869 /*
1870 * Embeds a single submodules git directory into the superprojects git dir,
1871 * non recursively.
1872 */
1873 static void relocate_single_git_dir_into_superproject(const char *prefix,
1874 const char *path)
1875 {
1876 char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1877 const char *new_git_dir;
1878 const struct submodule *sub;
1879
1880 if (submodule_uses_worktrees(path))
1881 die(_("relocate_gitdir for submodule '%s' with "
1882 "more than one worktree not supported"), path);
1883
1884 old_git_dir = xstrfmt("%s/.git", path);
1885 if (read_gitfile(old_git_dir))
1886 /* If it is an actual gitfile, it doesn't need migration. */
1887 return;
1888
1889 real_old_git_dir = real_pathdup(old_git_dir, 1);
1890
1891 sub = submodule_from_path(the_repository, &null_oid, path);
1892 if (!sub)
1893 die(_("could not lookup name for submodule '%s'"), path);
1894
1895 new_git_dir = git_path("modules/%s", sub->name);
1896 if (safe_create_leading_directories_const(new_git_dir) < 0)
1897 die(_("could not create directory '%s'"), new_git_dir);
1898 real_new_git_dir = real_pathdup(new_git_dir, 1);
1899
1900 fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1901 get_super_prefix_or_empty(), path,
1902 real_old_git_dir, real_new_git_dir);
1903
1904 relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1905
1906 free(old_git_dir);
1907 free(real_old_git_dir);
1908 free(real_new_git_dir);
1909 }
1910
1911 /*
1912 * Migrate the git directory of the submodule given by path from
1913 * having its git directory within the working tree to the git dir nested
1914 * in its superprojects git dir under modules/.
1915 */
1916 void absorb_git_dir_into_superproject(const char *prefix,
1917 const char *path,
1918 unsigned flags)
1919 {
1920 int err_code;
1921 const char *sub_git_dir;
1922 struct strbuf gitdir = STRBUF_INIT;
1923 strbuf_addf(&gitdir, "%s/.git", path);
1924 sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1925
1926 /* Not populated? */
1927 if (!sub_git_dir) {
1928 const struct submodule *sub;
1929
1930 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1931 /* unpopulated as expected */
1932 strbuf_release(&gitdir);
1933 return;
1934 }
1935
1936 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1937 /* We don't know what broke here. */
1938 read_gitfile_error_die(err_code, path, NULL);
1939
1940 /*
1941 * Maybe populated, but no git directory was found?
1942 * This can happen if the superproject is a submodule
1943 * itself and was just absorbed. The absorption of the
1944 * superproject did not rewrite the git file links yet,
1945 * fix it now.
1946 */
1947 sub = submodule_from_path(the_repository, &null_oid, path);
1948 if (!sub)
1949 die(_("could not lookup name for submodule '%s'"), path);
1950 connect_work_tree_and_git_dir(path,
1951 git_path("modules/%s", sub->name), 0);
1952 } else {
1953 /* Is it already absorbed into the superprojects git dir? */
1954 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1955 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1956
1957 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1958 relocate_single_git_dir_into_superproject(prefix, path);
1959
1960 free(real_sub_git_dir);
1961 free(real_common_git_dir);
1962 }
1963 strbuf_release(&gitdir);
1964
1965 if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1966 struct child_process cp = CHILD_PROCESS_INIT;
1967 struct strbuf sb = STRBUF_INIT;
1968
1969 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1970 BUG("we don't know how to pass the flags down?");
1971
1972 strbuf_addstr(&sb, get_super_prefix_or_empty());
1973 strbuf_addstr(&sb, path);
1974 strbuf_addch(&sb, '/');
1975
1976 cp.dir = path;
1977 cp.git_cmd = 1;
1978 cp.no_stdin = 1;
1979 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1980 "submodule--helper",
1981 "absorb-git-dirs", NULL);
1982 prepare_submodule_repo_env(&cp.env_array);
1983 if (run_command(&cp))
1984 die(_("could not recurse into submodule '%s'"), path);
1985
1986 strbuf_release(&sb);
1987 }
1988 }
1989
1990 const char *get_superproject_working_tree(void)
1991 {
1992 struct child_process cp = CHILD_PROCESS_INIT;
1993 struct strbuf sb = STRBUF_INIT;
1994 const char *one_up = real_path_if_valid("../");
1995 const char *cwd = xgetcwd();
1996 const char *ret = NULL;
1997 const char *subpath;
1998 int code;
1999 ssize_t len;
2000
2001 if (!is_inside_work_tree())
2002 /*
2003 * FIXME:
2004 * We might have a superproject, but it is harder
2005 * to determine.
2006 */
2007 return NULL;
2008
2009 if (!one_up)
2010 return NULL;
2011
2012 subpath = relative_path(cwd, one_up, &sb);
2013
2014 prepare_submodule_repo_env(&cp.env_array);
2015 argv_array_pop(&cp.env_array);
2016
2017 argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
2018 "ls-files", "-z", "--stage", "--full-name", "--",
2019 subpath, NULL);
2020 strbuf_reset(&sb);
2021
2022 cp.no_stdin = 1;
2023 cp.no_stderr = 1;
2024 cp.out = -1;
2025 cp.git_cmd = 1;
2026
2027 if (start_command(&cp))
2028 die(_("could not start ls-files in .."));
2029
2030 len = strbuf_read(&sb, cp.out, PATH_MAX);
2031 close(cp.out);
2032
2033 if (starts_with(sb.buf, "160000")) {
2034 int super_sub_len;
2035 int cwd_len = strlen(cwd);
2036 char *super_sub, *super_wt;
2037
2038 /*
2039 * There is a superproject having this repo as a submodule.
2040 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
2041 * We're only interested in the name after the tab.
2042 */
2043 super_sub = strchr(sb.buf, '\t') + 1;
2044 super_sub_len = sb.buf + sb.len - super_sub - 1;
2045
2046 if (super_sub_len > cwd_len ||
2047 strcmp(&cwd[cwd_len - super_sub_len], super_sub))
2048 BUG("returned path string doesn't match cwd?");
2049
2050 super_wt = xstrdup(cwd);
2051 super_wt[cwd_len - super_sub_len] = '\0';
2052
2053 ret = real_path(super_wt);
2054 free(super_wt);
2055 }
2056 strbuf_release(&sb);
2057
2058 code = finish_command(&cp);
2059
2060 if (code == 128)
2061 /* '../' is not a git repository */
2062 return NULL;
2063 if (code == 0 && len == 0)
2064 /* There is an unrelated git repository at '../' */
2065 return NULL;
2066 if (code)
2067 die(_("ls-tree returned unexpected return code %d"), code);
2068
2069 return ret;
2070 }
2071
2072 /*
2073 * Put the gitdir for a submodule (given relative to the main
2074 * repository worktree) into `buf`, or return -1 on error.
2075 */
2076 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
2077 {
2078 const struct submodule *sub;
2079 const char *git_dir;
2080 int ret = 0;
2081
2082 strbuf_reset(buf);
2083 strbuf_addstr(buf, submodule);
2084 strbuf_complete(buf, '/');
2085 strbuf_addstr(buf, ".git");
2086
2087 git_dir = read_gitfile(buf->buf);
2088 if (git_dir) {
2089 strbuf_reset(buf);
2090 strbuf_addstr(buf, git_dir);
2091 }
2092 if (!is_git_directory(buf->buf)) {
2093 sub = submodule_from_path(the_repository, &null_oid, submodule);
2094 if (!sub) {
2095 ret = -1;
2096 goto cleanup;
2097 }
2098 strbuf_reset(buf);
2099 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
2100 }
2101
2102 cleanup:
2103 return ret;
2104 }
Alternate source for your git.git needs