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Merge branch 'nd/prune-in-worktree'
[alt-git.git] / submodule.c
blob075c55f3ca8101e06731ef3b45e51d11ec00c7f6
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "submodule-config.h"
5 #include "submodule.h"
6 #include "dir.h"
7 #include "diff.h"
8 #include "commit.h"
9 #include "revision.h"
10 #include "run-command.h"
11 #include "diffcore.h"
12 #include "refs.h"
13 #include "string-list.h"
14 #include "sha1-array.h"
15 #include "argv-array.h"
16 #include "blob.h"
17 #include "thread-utils.h"
18 #include "quote.h"
19 #include "remote.h"
20 #include "worktree.h"
21 #include "parse-options.h"
22
23 static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
24 static struct string_list changed_submodule_paths = STRING_LIST_INIT_DUP;
25 static int initialized_fetch_ref_tips;
26 static struct oid_array ref_tips_before_fetch;
27 static struct oid_array ref_tips_after_fetch;
28
29 /*
30 * Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
31 * will be disabled because we can't guess what might be configured in
32 * .gitmodules unless the user resolves the conflict.
33 */
34 int is_gitmodules_unmerged(const struct index_state *istate)
35 {
36 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
37 if (pos < 0) { /* .gitmodules not found or isn't merged */
38 pos = -1 - pos;
39 if (istate->cache_nr > pos) { /* there is a .gitmodules */
40 const struct cache_entry *ce = istate->cache[pos];
41 if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
42 !strcmp(ce->name, GITMODULES_FILE))
43 return 1;
44 }
45 }
46
47 return 0;
48 }
49
50 /*
51 * Check if the .gitmodules file has unstaged modifications. This must be
52 * checked before allowing modifications to the .gitmodules file with the
53 * intention to stage them later, because when continuing we would stage the
54 * modifications the user didn't stage herself too. That might change in a
55 * future version when we learn to stage the changes we do ourselves without
56 * staging any previous modifications.
57 */
58 int is_staging_gitmodules_ok(const struct index_state *istate)
59 {
60 int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
61
62 if ((pos >= 0) && (pos < istate->cache_nr)) {
63 struct stat st;
64 if (lstat(GITMODULES_FILE, &st) == 0 &&
65 ce_match_stat(istate->cache[pos], &st, 0) & DATA_CHANGED)
66 return 0;
67 }
68
69 return 1;
70 }
71
72 static int for_each_remote_ref_submodule(const char *submodule,
73 each_ref_fn fn, void *cb_data)
74 {
75 return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
76 fn, cb_data);
77 }
78
79 /*
80 * Try to update the "path" entry in the "submodule.<name>" section of the
81 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
82 * with the correct path=<oldpath> setting was found and we could update it.
83 */
84 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
85 {
86 struct strbuf entry = STRBUF_INIT;
87 const struct submodule *submodule;
88
89 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
90 return -1;
91
92 if (is_gitmodules_unmerged(&the_index))
93 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
94
95 submodule = submodule_from_path(&null_oid, oldpath);
96 if (!submodule || !submodule->name) {
97 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
98 return -1;
99 }
100 strbuf_addstr(&entry, "submodule.");
101 strbuf_addstr(&entry, submodule->name);
102 strbuf_addstr(&entry, ".path");
103 if (git_config_set_in_file_gently(GITMODULES_FILE, entry.buf, newpath) < 0) {
104 /* Maybe the user already did that, don't error out here */
105 warning(_("Could not update .gitmodules entry %s"), entry.buf);
106 strbuf_release(&entry);
107 return -1;
108 }
109 strbuf_release(&entry);
110 return 0;
111 }
112
113 /*
114 * Try to remove the "submodule.<name>" section from .gitmodules where the given
115 * path is configured. Return 0 only if a .gitmodules file was found, a section
116 * with the correct path=<path> setting was found and we could remove it.
117 */
118 int remove_path_from_gitmodules(const char *path)
119 {
120 struct strbuf sect = STRBUF_INIT;
121 const struct submodule *submodule;
122
123 if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
124 return -1;
125
126 if (is_gitmodules_unmerged(&the_index))
127 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
128
129 submodule = submodule_from_path(&null_oid, path);
130 if (!submodule || !submodule->name) {
131 warning(_("Could not find section in .gitmodules where path=%s"), path);
132 return -1;
133 }
134 strbuf_addstr(&sect, "submodule.");
135 strbuf_addstr(&sect, submodule->name);
136 if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
137 /* Maybe the user already did that, don't error out here */
138 warning(_("Could not remove .gitmodules entry for %s"), path);
139 strbuf_release(&sect);
140 return -1;
141 }
142 strbuf_release(&sect);
143 return 0;
144 }
145
146 void stage_updated_gitmodules(void)
147 {
148 if (add_file_to_cache(GITMODULES_FILE, 0))
149 die(_("staging updated .gitmodules failed"));
150 }
151
152 static int add_submodule_odb(const char *path)
153 {
154 struct strbuf objects_directory = STRBUF_INIT;
155 int ret = 0;
156
157 ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
158 if (ret)
159 goto done;
160 if (!is_directory(objects_directory.buf)) {
161 ret = -1;
162 goto done;
163 }
164 add_to_alternates_memory(objects_directory.buf);
165 done:
166 strbuf_release(&objects_directory);
167 return ret;
168 }
169
170 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
171 const char *path)
172 {
173 const struct submodule *submodule = submodule_from_path(&null_oid, path);
174 if (submodule) {
175 const char *ignore;
176 char *key;
177
178 key = xstrfmt("submodule.%s.ignore", submodule->name);
179 if (repo_config_get_string_const(the_repository, key, &ignore))
180 ignore = submodule->ignore;
181 free(key);
182
183 if (ignore)
184 handle_ignore_submodules_arg(diffopt, ignore);
185 else if (is_gitmodules_unmerged(&the_index))
186 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
187 }
188 }
189
190 /* Cheap function that only determines if we're interested in submodules at all */
191 int git_default_submodule_config(const char *var, const char *value, void *cb)
192 {
193 if (!strcmp(var, "submodule.recurse")) {
194 int v = git_config_bool(var, value) ?
195 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
196 config_update_recurse_submodules = v;
197 }
198 return 0;
199 }
200
201 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
202 const char *arg, int unset)
203 {
204 if (unset) {
205 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
206 return 0;
207 }
208 if (arg)
209 config_update_recurse_submodules =
210 parse_update_recurse_submodules_arg(opt->long_name,
211 arg);
212 else
213 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
214
215 return 0;
216 }
217
218 /*
219 * Determine if a submodule has been initialized at a given 'path'
220 */
221 int is_submodule_active(struct repository *repo, const char *path)
222 {
223 int ret = 0;
224 char *key = NULL;
225 char *value = NULL;
226 const struct string_list *sl;
227 const struct submodule *module;
228
229 module = submodule_from_cache(repo, &null_oid, path);
230
231 /* early return if there isn't a path->module mapping */
232 if (!module)
233 return 0;
234
235 /* submodule.<name>.active is set */
236 key = xstrfmt("submodule.%s.active", module->name);
237 if (!repo_config_get_bool(repo, key, &ret)) {
238 free(key);
239 return ret;
240 }
241 free(key);
242
243 /* submodule.active is set */
244 sl = repo_config_get_value_multi(repo, "submodule.active");
245 if (sl) {
246 struct pathspec ps;
247 struct argv_array args = ARGV_ARRAY_INIT;
248 const struct string_list_item *item;
249
250 for_each_string_list_item(item, sl) {
251 argv_array_push(&args, item->string);
252 }
253
254 parse_pathspec(&ps, 0, 0, NULL, args.argv);
255 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
256
257 argv_array_clear(&args);
258 clear_pathspec(&ps);
259 return ret;
260 }
261
262 /* fallback to checking if the URL is set */
263 key = xstrfmt("submodule.%s.url", module->name);
264 ret = !repo_config_get_string(repo, key, &value);
265
266 free(value);
267 free(key);
268 return ret;
269 }
270
271 int is_submodule_populated_gently(const char *path, int *return_error_code)
272 {
273 int ret = 0;
274 char *gitdir = xstrfmt("%s/.git", path);
275
276 if (resolve_gitdir_gently(gitdir, return_error_code))
277 ret = 1;
278
279 free(gitdir);
280 return ret;
281 }
282
283 /*
284 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
285 */
286 void die_in_unpopulated_submodule(const struct index_state *istate,
287 const char *prefix)
288 {
289 int i, prefixlen;
290
291 if (!prefix)
292 return;
293
294 prefixlen = strlen(prefix);
295
296 for (i = 0; i < istate->cache_nr; i++) {
297 struct cache_entry *ce = istate->cache[i];
298 int ce_len = ce_namelen(ce);
299
300 if (!S_ISGITLINK(ce->ce_mode))
301 continue;
302 if (prefixlen <= ce_len)
303 continue;
304 if (strncmp(ce->name, prefix, ce_len))
305 continue;
306 if (prefix[ce_len] != '/')
307 continue;
308
309 die(_("in unpopulated submodule '%s'"), ce->name);
310 }
311 }
312
313 /*
314 * Dies if any paths in the provided pathspec descends into a submodule
315 */
316 void die_path_inside_submodule(const struct index_state *istate,
317 const struct pathspec *ps)
318 {
319 int i, j;
320
321 for (i = 0; i < istate->cache_nr; i++) {
322 struct cache_entry *ce = istate->cache[i];
323 int ce_len = ce_namelen(ce);
324
325 if (!S_ISGITLINK(ce->ce_mode))
326 continue;
327
328 for (j = 0; j < ps->nr ; j++) {
329 const struct pathspec_item *item = &ps->items[j];
330
331 if (item->len <= ce_len)
332 continue;
333 if (item->match[ce_len] != '/')
334 continue;
335 if (strncmp(ce->name, item->match, ce_len))
336 continue;
337 if (item->len == ce_len + 1)
338 continue;
339
340 die(_("Pathspec '%s' is in submodule '%.*s'"),
341 item->original, ce_len, ce->name);
342 }
343 }
344 }
345
346 enum submodule_update_type parse_submodule_update_type(const char *value)
347 {
348 if (!strcmp(value, "none"))
349 return SM_UPDATE_NONE;
350 else if (!strcmp(value, "checkout"))
351 return SM_UPDATE_CHECKOUT;
352 else if (!strcmp(value, "rebase"))
353 return SM_UPDATE_REBASE;
354 else if (!strcmp(value, "merge"))
355 return SM_UPDATE_MERGE;
356 else if (*value == '!')
357 return SM_UPDATE_COMMAND;
358 else
359 return SM_UPDATE_UNSPECIFIED;
360 }
361
362 int parse_submodule_update_strategy(const char *value,
363 struct submodule_update_strategy *dst)
364 {
365 enum submodule_update_type type;
366
367 free((void*)dst->command);
368 dst->command = NULL;
369
370 type = parse_submodule_update_type(value);
371 if (type == SM_UPDATE_UNSPECIFIED)
372 return -1;
373
374 dst->type = type;
375 if (type == SM_UPDATE_COMMAND)
376 dst->command = xstrdup(value + 1);
377
378 return 0;
379 }
380
381 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
382 {
383 struct strbuf sb = STRBUF_INIT;
384 switch (s->type) {
385 case SM_UPDATE_CHECKOUT:
386 return "checkout";
387 case SM_UPDATE_MERGE:
388 return "merge";
389 case SM_UPDATE_REBASE:
390 return "rebase";
391 case SM_UPDATE_NONE:
392 return "none";
393 case SM_UPDATE_UNSPECIFIED:
394 return NULL;
395 case SM_UPDATE_COMMAND:
396 strbuf_addf(&sb, "!%s", s->command);
397 return strbuf_detach(&sb, NULL);
398 }
399 return NULL;
400 }
401
402 void handle_ignore_submodules_arg(struct diff_options *diffopt,
403 const char *arg)
404 {
405 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
406 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
407 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
408
409 if (!strcmp(arg, "all"))
410 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
411 else if (!strcmp(arg, "untracked"))
412 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
413 else if (!strcmp(arg, "dirty"))
414 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
415 else if (strcmp(arg, "none"))
416 die("bad --ignore-submodules argument: %s", arg);
417 }
418
419 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
420 struct commit *left, struct commit *right,
421 struct commit_list *merge_bases)
422 {
423 struct commit_list *list;
424
425 init_revisions(rev, NULL);
426 setup_revisions(0, NULL, rev, NULL);
427 rev->left_right = 1;
428 rev->first_parent_only = 1;
429 left->object.flags |= SYMMETRIC_LEFT;
430 add_pending_object(rev, &left->object, path);
431 add_pending_object(rev, &right->object, path);
432 for (list = merge_bases; list; list = list->next) {
433 list->item->object.flags |= UNINTERESTING;
434 add_pending_object(rev, &list->item->object,
435 oid_to_hex(&list->item->object.oid));
436 }
437 return prepare_revision_walk(rev);
438 }
439
440 static void print_submodule_summary(struct rev_info *rev, struct diff_options *o)
441 {
442 static const char format[] = " %m %s";
443 struct strbuf sb = STRBUF_INIT;
444 struct commit *commit;
445
446 while ((commit = get_revision(rev))) {
447 struct pretty_print_context ctx = {0};
448 ctx.date_mode = rev->date_mode;
449 ctx.output_encoding = get_log_output_encoding();
450 strbuf_setlen(&sb, 0);
451 format_commit_message(commit, format, &sb, &ctx);
452 strbuf_addch(&sb, '\n');
453 if (commit->object.flags & SYMMETRIC_LEFT)
454 diff_emit_submodule_del(o, sb.buf);
455 else
456 diff_emit_submodule_add(o, sb.buf);
457 }
458 strbuf_release(&sb);
459 }
460
461 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
462 {
463 const char * const *var;
464
465 for (var = local_repo_env; *var; var++) {
466 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
467 argv_array_push(out, *var);
468 }
469 }
470
471 void prepare_submodule_repo_env(struct argv_array *out)
472 {
473 prepare_submodule_repo_env_no_git_dir(out);
474 argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
475 DEFAULT_GIT_DIR_ENVIRONMENT);
476 }
477
478 /* Helper function to display the submodule header line prior to the full
479 * summary output. If it can locate the submodule objects directory it will
480 * attempt to lookup both the left and right commits and put them into the
481 * left and right pointers.
482 */
483 static void show_submodule_header(struct diff_options *o, const char *path,
484 struct object_id *one, struct object_id *two,
485 unsigned dirty_submodule,
486 struct commit **left, struct commit **right,
487 struct commit_list **merge_bases)
488 {
489 const char *message = NULL;
490 struct strbuf sb = STRBUF_INIT;
491 int fast_forward = 0, fast_backward = 0;
492
493 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
494 diff_emit_submodule_untracked(o, path);
495
496 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
497 diff_emit_submodule_modified(o, path);
498
499 if (is_null_oid(one))
500 message = "(new submodule)";
501 else if (is_null_oid(two))
502 message = "(submodule deleted)";
503
504 if (add_submodule_odb(path)) {
505 if (!message)
506 message = "(not initialized)";
507 goto output_header;
508 }
509
510 /*
511 * Attempt to lookup the commit references, and determine if this is
512 * a fast forward or fast backwards update.
513 */
514 *left = lookup_commit_reference(one);
515 *right = lookup_commit_reference(two);
516
517 /*
518 * Warn about missing commits in the submodule project, but only if
519 * they aren't null.
520 */
521 if ((!is_null_oid(one) && !*left) ||
522 (!is_null_oid(two) && !*right))
523 message = "(commits not present)";
524
525 *merge_bases = get_merge_bases(*left, *right);
526 if (*merge_bases) {
527 if ((*merge_bases)->item == *left)
528 fast_forward = 1;
529 else if ((*merge_bases)->item == *right)
530 fast_backward = 1;
531 }
532
533 if (!oidcmp(one, two)) {
534 strbuf_release(&sb);
535 return;
536 }
537
538 output_header:
539 strbuf_addf(&sb, "Submodule %s ", path);
540 strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
541 strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
542 strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
543 if (message)
544 strbuf_addf(&sb, " %s\n", message);
545 else
546 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
547 diff_emit_submodule_header(o, sb.buf);
548
549 strbuf_release(&sb);
550 }
551
552 void show_submodule_summary(struct diff_options *o, const char *path,
553 struct object_id *one, struct object_id *two,
554 unsigned dirty_submodule)
555 {
556 struct rev_info rev;
557 struct commit *left = NULL, *right = NULL;
558 struct commit_list *merge_bases = NULL;
559
560 show_submodule_header(o, path, one, two, dirty_submodule,
561 &left, &right, &merge_bases);
562
563 /*
564 * If we don't have both a left and a right pointer, there is no
565 * reason to try and display a summary. The header line should contain
566 * all the information the user needs.
567 */
568 if (!left || !right)
569 goto out;
570
571 /* Treat revision walker failure the same as missing commits */
572 if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
573 diff_emit_submodule_error(o, "(revision walker failed)\n");
574 goto out;
575 }
576
577 print_submodule_summary(&rev, o);
578
579 out:
580 if (merge_bases)
581 free_commit_list(merge_bases);
582 clear_commit_marks(left, ~0);
583 clear_commit_marks(right, ~0);
584 }
585
586 void show_submodule_inline_diff(struct diff_options *o, const char *path,
587 struct object_id *one, struct object_id *two,
588 unsigned dirty_submodule)
589 {
590 const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
591 struct commit *left = NULL, *right = NULL;
592 struct commit_list *merge_bases = NULL;
593 struct child_process cp = CHILD_PROCESS_INIT;
594 struct strbuf sb = STRBUF_INIT;
595
596 show_submodule_header(o, path, one, two, dirty_submodule,
597 &left, &right, &merge_bases);
598
599 /* We need a valid left and right commit to display a difference */
600 if (!(left || is_null_oid(one)) ||
601 !(right || is_null_oid(two)))
602 goto done;
603
604 if (left)
605 old = one;
606 if (right)
607 new = two;
608
609 cp.git_cmd = 1;
610 cp.dir = path;
611 cp.out = -1;
612 cp.no_stdin = 1;
613
614 /* TODO: other options may need to be passed here. */
615 argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
616 argv_array_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
617 "always" : "never");
618
619 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
620 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
621 o->b_prefix, path);
622 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
623 o->a_prefix, path);
624 } else {
625 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
626 o->a_prefix, path);
627 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
628 o->b_prefix, path);
629 }
630 argv_array_push(&cp.args, oid_to_hex(old));
631 /*
632 * If the submodule has modified content, we will diff against the
633 * work tree, under the assumption that the user has asked for the
634 * diff format and wishes to actually see all differences even if they
635 * haven't yet been committed to the submodule yet.
636 */
637 if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
638 argv_array_push(&cp.args, oid_to_hex(new));
639
640 prepare_submodule_repo_env(&cp.env_array);
641 if (start_command(&cp))
642 diff_emit_submodule_error(o, "(diff failed)\n");
643
644 while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
645 diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
646
647 if (finish_command(&cp))
648 diff_emit_submodule_error(o, "(diff failed)\n");
649
650 done:
651 strbuf_release(&sb);
652 if (merge_bases)
653 free_commit_list(merge_bases);
654 if (left)
655 clear_commit_marks(left, ~0);
656 if (right)
657 clear_commit_marks(right, ~0);
658 }
659
660 int should_update_submodules(void)
661 {
662 return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
663 }
664
665 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
666 {
667 if (!S_ISGITLINK(ce->ce_mode))
668 return NULL;
669
670 if (!should_update_submodules())
671 return NULL;
672
673 return submodule_from_path(&null_oid, ce->name);
674 }
675
676 static struct oid_array *submodule_commits(struct string_list *submodules,
677 const char *path)
678 {
679 struct string_list_item *item;
680
681 item = string_list_insert(submodules, path);
682 if (item->util)
683 return (struct oid_array *) item->util;
684
685 /* NEEDSWORK: should we have oid_array_init()? */
686 item->util = xcalloc(1, sizeof(struct oid_array));
687 return (struct oid_array *) item->util;
688 }
689
690 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
691 struct diff_options *options,
692 void *data)
693 {
694 int i;
695 struct string_list *changed = data;
696
697 for (i = 0; i < q->nr; i++) {
698 struct diff_filepair *p = q->queue[i];
699 struct oid_array *commits;
700 if (!S_ISGITLINK(p->two->mode))
701 continue;
702
703 if (S_ISGITLINK(p->one->mode)) {
704 /*
705 * NEEDSWORK: We should honor the name configured in
706 * the .gitmodules file of the commit we are examining
707 * here to be able to correctly follow submodules
708 * being moved around.
709 */
710 commits = submodule_commits(changed, p->two->path);
711 oid_array_append(commits, &p->two->oid);
712 } else {
713 /* Submodule is new or was moved here */
714 /*
715 * NEEDSWORK: When the .git directories of submodules
716 * live inside the superprojects .git directory some
717 * day we should fetch new submodules directly into
718 * that location too when config or options request
719 * that so they can be checked out from there.
720 */
721 continue;
722 }
723 }
724 }
725
726 /*
727 * Collect the paths of submodules in 'changed' which have changed based on
728 * the revisions as specified in 'argv'. Each entry in 'changed' will also
729 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
730 * what the submodule pointers were updated to during the change.
731 */
732 static void collect_changed_submodules(struct string_list *changed,
733 struct argv_array *argv)
734 {
735 struct rev_info rev;
736 const struct commit *commit;
737
738 init_revisions(&rev, NULL);
739 setup_revisions(argv->argc, argv->argv, &rev, NULL);
740 if (prepare_revision_walk(&rev))
741 die("revision walk setup failed");
742
743 while ((commit = get_revision(&rev))) {
744 struct rev_info diff_rev;
745
746 init_revisions(&diff_rev, NULL);
747 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
748 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
749 diff_rev.diffopt.format_callback_data = changed;
750 diff_tree_combined_merge(commit, 1, &diff_rev);
751 }
752
753 reset_revision_walk();
754 }
755
756 static void free_submodules_oids(struct string_list *submodules)
757 {
758 struct string_list_item *item;
759 for_each_string_list_item(item, submodules)
760 oid_array_clear((struct oid_array *) item->util);
761 string_list_clear(submodules, 1);
762 }
763
764 static int has_remote(const char *refname, const struct object_id *oid,
765 int flags, void *cb_data)
766 {
767 return 1;
768 }
769
770 static int append_oid_to_argv(const struct object_id *oid, void *data)
771 {
772 struct argv_array *argv = data;
773 argv_array_push(argv, oid_to_hex(oid));
774 return 0;
775 }
776
777 static int check_has_commit(const struct object_id *oid, void *data)
778 {
779 int *has_commit = data;
780
781 if (!lookup_commit_reference(oid))
782 *has_commit = 0;
783
784 return 0;
785 }
786
787 static int submodule_has_commits(const char *path, struct oid_array *commits)
788 {
789 int has_commit = 1;
790
791 /*
792 * Perform a cheap, but incorrect check for the existence of 'commits'.
793 * This is done by adding the submodule's object store to the in-core
794 * object store, and then querying for each commit's existence. If we
795 * do not have the commit object anywhere, there is no chance we have
796 * it in the object store of the correct submodule and have it
797 * reachable from a ref, so we can fail early without spawning rev-list
798 * which is expensive.
799 */
800 if (add_submodule_odb(path))
801 return 0;
802
803 oid_array_for_each_unique(commits, check_has_commit, &has_commit);
804
805 if (has_commit) {
806 /*
807 * Even if the submodule is checked out and the commit is
808 * present, make sure it exists in the submodule's object store
809 * and that it is reachable from a ref.
810 */
811 struct child_process cp = CHILD_PROCESS_INIT;
812 struct strbuf out = STRBUF_INIT;
813
814 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
815 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
816 argv_array_pushl(&cp.args, "--not", "--all", NULL);
817
818 prepare_submodule_repo_env(&cp.env_array);
819 cp.git_cmd = 1;
820 cp.no_stdin = 1;
821 cp.dir = path;
822
823 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
824 has_commit = 0;
825
826 strbuf_release(&out);
827 }
828
829 return has_commit;
830 }
831
832 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
833 {
834 if (!submodule_has_commits(path, commits))
835 /*
836 * NOTE: We do consider it safe to return "no" here. The
837 * correct answer would be "We do not know" instead of
838 * "No push needed", but it is quite hard to change
839 * the submodule pointer without having the submodule
840 * around. If a user did however change the submodules
841 * without having the submodule around, this indicates
842 * an expert who knows what they are doing or a
843 * maintainer integrating work from other people. In
844 * both cases it should be safe to skip this check.
845 */
846 return 0;
847
848 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
849 struct child_process cp = CHILD_PROCESS_INIT;
850 struct strbuf buf = STRBUF_INIT;
851 int needs_pushing = 0;
852
853 argv_array_push(&cp.args, "rev-list");
854 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
855 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
856
857 prepare_submodule_repo_env(&cp.env_array);
858 cp.git_cmd = 1;
859 cp.no_stdin = 1;
860 cp.out = -1;
861 cp.dir = path;
862 if (start_command(&cp))
863 die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
864 path);
865 if (strbuf_read(&buf, cp.out, 41))
866 needs_pushing = 1;
867 finish_command(&cp);
868 close(cp.out);
869 strbuf_release(&buf);
870 return needs_pushing;
871 }
872
873 return 0;
874 }
875
876 int find_unpushed_submodules(struct oid_array *commits,
877 const char *remotes_name, struct string_list *needs_pushing)
878 {
879 struct string_list submodules = STRING_LIST_INIT_DUP;
880 struct string_list_item *submodule;
881 struct argv_array argv = ARGV_ARRAY_INIT;
882
883 /* argv.argv[0] will be ignored by setup_revisions */
884 argv_array_push(&argv, "find_unpushed_submodules");
885 oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
886 argv_array_push(&argv, "--not");
887 argv_array_pushf(&argv, "--remotes=%s", remotes_name);
888
889 collect_changed_submodules(&submodules, &argv);
890
891 for_each_string_list_item(submodule, &submodules) {
892 struct oid_array *commits = submodule->util;
893 const char *path = submodule->string;
894
895 if (submodule_needs_pushing(path, commits))
896 string_list_insert(needs_pushing, path);
897 }
898
899 free_submodules_oids(&submodules);
900 argv_array_clear(&argv);
901
902 return needs_pushing->nr;
903 }
904
905 static int push_submodule(const char *path,
906 const struct remote *remote,
907 const char **refspec, int refspec_nr,
908 const struct string_list *push_options,
909 int dry_run)
910 {
911 if (add_submodule_odb(path))
912 return 1;
913
914 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
915 struct child_process cp = CHILD_PROCESS_INIT;
916 argv_array_push(&cp.args, "push");
917 if (dry_run)
918 argv_array_push(&cp.args, "--dry-run");
919
920 if (push_options && push_options->nr) {
921 const struct string_list_item *item;
922 for_each_string_list_item(item, push_options)
923 argv_array_pushf(&cp.args, "--push-option=%s",
924 item->string);
925 }
926
927 if (remote->origin != REMOTE_UNCONFIGURED) {
928 int i;
929 argv_array_push(&cp.args, remote->name);
930 for (i = 0; i < refspec_nr; i++)
931 argv_array_push(&cp.args, refspec[i]);
932 }
933
934 prepare_submodule_repo_env(&cp.env_array);
935 cp.git_cmd = 1;
936 cp.no_stdin = 1;
937 cp.dir = path;
938 if (run_command(&cp))
939 return 0;
940 close(cp.out);
941 }
942
943 return 1;
944 }
945
946 /*
947 * Perform a check in the submodule to see if the remote and refspec work.
948 * Die if the submodule can't be pushed.
949 */
950 static void submodule_push_check(const char *path, const char *head,
951 const struct remote *remote,
952 const char **refspec, int refspec_nr)
953 {
954 struct child_process cp = CHILD_PROCESS_INIT;
955 int i;
956
957 argv_array_push(&cp.args, "submodule--helper");
958 argv_array_push(&cp.args, "push-check");
959 argv_array_push(&cp.args, head);
960 argv_array_push(&cp.args, remote->name);
961
962 for (i = 0; i < refspec_nr; i++)
963 argv_array_push(&cp.args, refspec[i]);
964
965 prepare_submodule_repo_env(&cp.env_array);
966 cp.git_cmd = 1;
967 cp.no_stdin = 1;
968 cp.no_stdout = 1;
969 cp.dir = path;
970
971 /*
972 * Simply indicate if 'submodule--helper push-check' failed.
973 * More detailed error information will be provided by the
974 * child process.
975 */
976 if (run_command(&cp))
977 die("process for submodule '%s' failed", path);
978 }
979
980 int push_unpushed_submodules(struct oid_array *commits,
981 const struct remote *remote,
982 const char **refspec, int refspec_nr,
983 const struct string_list *push_options,
984 int dry_run)
985 {
986 int i, ret = 1;
987 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
988
989 if (!find_unpushed_submodules(commits, remote->name, &needs_pushing))
990 return 1;
991
992 /*
993 * Verify that the remote and refspec can be propagated to all
994 * submodules. This check can be skipped if the remote and refspec
995 * won't be propagated due to the remote being unconfigured (e.g. a URL
996 * instead of a remote name).
997 */
998 if (remote->origin != REMOTE_UNCONFIGURED) {
999 char *head;
1000 struct object_id head_oid;
1001
1002 head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
1003 if (!head)
1004 die(_("Failed to resolve HEAD as a valid ref."));
1005
1006 for (i = 0; i < needs_pushing.nr; i++)
1007 submodule_push_check(needs_pushing.items[i].string,
1008 head, remote,
1009 refspec, refspec_nr);
1010 free(head);
1011 }
1012
1013 /* Actually push the submodules */
1014 for (i = 0; i < needs_pushing.nr; i++) {
1015 const char *path = needs_pushing.items[i].string;
1016 fprintf(stderr, "Pushing submodule '%s'\n", path);
1017 if (!push_submodule(path, remote, refspec, refspec_nr,
1018 push_options, dry_run)) {
1019 fprintf(stderr, "Unable to push submodule '%s'\n", path);
1020 ret = 0;
1021 }
1022 }
1023
1024 string_list_clear(&needs_pushing, 0);
1025
1026 return ret;
1027 }
1028
1029 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1030 int flags, void *data)
1031 {
1032 struct oid_array *array = data;
1033 oid_array_append(array, oid);
1034 return 0;
1035 }
1036
1037 void check_for_new_submodule_commits(struct object_id *oid)
1038 {
1039 if (!initialized_fetch_ref_tips) {
1040 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1041 initialized_fetch_ref_tips = 1;
1042 }
1043
1044 oid_array_append(&ref_tips_after_fetch, oid);
1045 }
1046
1047 static void calculate_changed_submodule_paths(void)
1048 {
1049 struct argv_array argv = ARGV_ARRAY_INIT;
1050 struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1051 const struct string_list_item *item;
1052
1053 /* No need to check if there are no submodules configured */
1054 if (!submodule_from_path(NULL, NULL))
1055 return;
1056
1057 argv_array_push(&argv, "--"); /* argv[0] program name */
1058 oid_array_for_each_unique(&ref_tips_after_fetch,
1059 append_oid_to_argv, &argv);
1060 argv_array_push(&argv, "--not");
1061 oid_array_for_each_unique(&ref_tips_before_fetch,
1062 append_oid_to_argv, &argv);
1063
1064 /*
1065 * Collect all submodules (whether checked out or not) for which new
1066 * commits have been recorded upstream in "changed_submodule_paths".
1067 */
1068 collect_changed_submodules(&changed_submodules, &argv);
1069
1070 for_each_string_list_item(item, &changed_submodules) {
1071 struct oid_array *commits = item->util;
1072 const char *path = item->string;
1073
1074 if (!submodule_has_commits(path, commits))
1075 string_list_append(&changed_submodule_paths, path);
1076 }
1077
1078 free_submodules_oids(&changed_submodules);
1079 argv_array_clear(&argv);
1080 oid_array_clear(&ref_tips_before_fetch);
1081 oid_array_clear(&ref_tips_after_fetch);
1082 initialized_fetch_ref_tips = 0;
1083 }
1084
1085 int submodule_touches_in_range(struct object_id *excl_oid,
1086 struct object_id *incl_oid)
1087 {
1088 struct string_list subs = STRING_LIST_INIT_DUP;
1089 struct argv_array args = ARGV_ARRAY_INIT;
1090 int ret;
1091
1092 /* No need to check if there are no submodules configured */
1093 if (!submodule_from_path(NULL, NULL))
1094 return 0;
1095
1096 argv_array_push(&args, "--"); /* args[0] program name */
1097 argv_array_push(&args, oid_to_hex(incl_oid));
1098 argv_array_push(&args, "--not");
1099 argv_array_push(&args, oid_to_hex(excl_oid));
1100
1101 collect_changed_submodules(&subs, &args);
1102 ret = subs.nr;
1103
1104 argv_array_clear(&args);
1105
1106 free_submodules_oids(&subs);
1107 return ret;
1108 }
1109
1110 struct submodule_parallel_fetch {
1111 int count;
1112 struct argv_array args;
1113 const char *work_tree;
1114 const char *prefix;
1115 int command_line_option;
1116 int default_option;
1117 int quiet;
1118 int result;
1119 };
1120 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0, 0}
1121
1122 static int get_next_submodule(struct child_process *cp,
1123 struct strbuf *err, void *data, void **task_cb)
1124 {
1125 int ret = 0;
1126 struct submodule_parallel_fetch *spf = data;
1127
1128 for (; spf->count < active_nr; spf->count++) {
1129 struct strbuf submodule_path = STRBUF_INIT;
1130 struct strbuf submodule_git_dir = STRBUF_INIT;
1131 struct strbuf submodule_prefix = STRBUF_INIT;
1132 const struct cache_entry *ce = active_cache[spf->count];
1133 const char *git_dir, *default_argv;
1134 const struct submodule *submodule;
1135
1136 if (!S_ISGITLINK(ce->ce_mode))
1137 continue;
1138
1139 submodule = submodule_from_path(&null_oid, ce->name);
1140
1141 default_argv = "yes";
1142 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
1143 int fetch_recurse = RECURSE_SUBMODULES_NONE;
1144
1145 if (submodule) {
1146 char *key;
1147 const char *value;
1148
1149 fetch_recurse = submodule->fetch_recurse;
1150 key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
1151 if (!repo_config_get_string_const(the_repository, key, &value)) {
1152 fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
1153 }
1154 free(key);
1155 }
1156
1157 if (fetch_recurse != RECURSE_SUBMODULES_NONE) {
1158 if (fetch_recurse == RECURSE_SUBMODULES_OFF)
1159 continue;
1160 if (fetch_recurse == RECURSE_SUBMODULES_ON_DEMAND) {
1161 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1162 continue;
1163 default_argv = "on-demand";
1164 }
1165 } else {
1166 if (spf->default_option == RECURSE_SUBMODULES_OFF)
1167 continue;
1168 if (spf->default_option == RECURSE_SUBMODULES_ON_DEMAND) {
1169 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1170 continue;
1171 default_argv = "on-demand";
1172 }
1173 }
1174 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
1175 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1176 continue;
1177 default_argv = "on-demand";
1178 }
1179
1180 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
1181 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1182 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1183 git_dir = read_gitfile(submodule_git_dir.buf);
1184 if (!git_dir)
1185 git_dir = submodule_git_dir.buf;
1186 if (is_directory(git_dir)) {
1187 child_process_init(cp);
1188 cp->dir = strbuf_detach(&submodule_path, NULL);
1189 prepare_submodule_repo_env(&cp->env_array);
1190 cp->git_cmd = 1;
1191 if (!spf->quiet)
1192 strbuf_addf(err, "Fetching submodule %s%s\n",
1193 spf->prefix, ce->name);
1194 argv_array_init(&cp->args);
1195 argv_array_pushv(&cp->args, spf->args.argv);
1196 argv_array_push(&cp->args, default_argv);
1197 argv_array_push(&cp->args, "--submodule-prefix");
1198 argv_array_push(&cp->args, submodule_prefix.buf);
1199 ret = 1;
1200 }
1201 strbuf_release(&submodule_path);
1202 strbuf_release(&submodule_git_dir);
1203 strbuf_release(&submodule_prefix);
1204 if (ret) {
1205 spf->count++;
1206 return 1;
1207 }
1208 }
1209 return 0;
1210 }
1211
1212 static int fetch_start_failure(struct strbuf *err,
1213 void *cb, void *task_cb)
1214 {
1215 struct submodule_parallel_fetch *spf = cb;
1216
1217 spf->result = 1;
1218
1219 return 0;
1220 }
1221
1222 static int fetch_finish(int retvalue, struct strbuf *err,
1223 void *cb, void *task_cb)
1224 {
1225 struct submodule_parallel_fetch *spf = cb;
1226
1227 if (retvalue)
1228 spf->result = 1;
1229
1230 return 0;
1231 }
1232
1233 int fetch_populated_submodules(const struct argv_array *options,
1234 const char *prefix, int command_line_option,
1235 int default_option,
1236 int quiet, int max_parallel_jobs)
1237 {
1238 int i;
1239 struct submodule_parallel_fetch spf = SPF_INIT;
1240
1241 spf.work_tree = get_git_work_tree();
1242 spf.command_line_option = command_line_option;
1243 spf.default_option = default_option;
1244 spf.quiet = quiet;
1245 spf.prefix = prefix;
1246
1247 if (!spf.work_tree)
1248 goto out;
1249
1250 if (read_cache() < 0)
1251 die("index file corrupt");
1252
1253 argv_array_push(&spf.args, "fetch");
1254 for (i = 0; i < options->argc; i++)
1255 argv_array_push(&spf.args, options->argv[i]);
1256 argv_array_push(&spf.args, "--recurse-submodules-default");
1257 /* default value, "--submodule-prefix" and its value are added later */
1258
1259 calculate_changed_submodule_paths();
1260 run_processes_parallel(max_parallel_jobs,
1261 get_next_submodule,
1262 fetch_start_failure,
1263 fetch_finish,
1264 &spf);
1265
1266 argv_array_clear(&spf.args);
1267 out:
1268 string_list_clear(&changed_submodule_paths, 1);
1269 return spf.result;
1270 }
1271
1272 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1273 {
1274 struct child_process cp = CHILD_PROCESS_INIT;
1275 struct strbuf buf = STRBUF_INIT;
1276 FILE *fp;
1277 unsigned dirty_submodule = 0;
1278 const char *git_dir;
1279 int ignore_cp_exit_code = 0;
1280
1281 strbuf_addf(&buf, "%s/.git", path);
1282 git_dir = read_gitfile(buf.buf);
1283 if (!git_dir)
1284 git_dir = buf.buf;
1285 if (!is_git_directory(git_dir)) {
1286 if (is_directory(git_dir))
1287 die(_("'%s' not recognized as a git repository"), git_dir);
1288 strbuf_release(&buf);
1289 /* The submodule is not checked out, so it is not modified */
1290 return 0;
1291 }
1292 strbuf_reset(&buf);
1293
1294 argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1295 if (ignore_untracked)
1296 argv_array_push(&cp.args, "-uno");
1297
1298 prepare_submodule_repo_env(&cp.env_array);
1299 cp.git_cmd = 1;
1300 cp.no_stdin = 1;
1301 cp.out = -1;
1302 cp.dir = path;
1303 if (start_command(&cp))
1304 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1305
1306 fp = xfdopen(cp.out, "r");
1307 while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1308 /* regular untracked files */
1309 if (buf.buf[0] == '?')
1310 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1311
1312 if (buf.buf[0] == 'u' ||
1313 buf.buf[0] == '1' ||
1314 buf.buf[0] == '2') {
1315 /* T = line type, XY = status, SSSS = submodule state */
1316 if (buf.len < strlen("T XY SSSS"))
1317 die("BUG: invalid status --porcelain=2 line %s",
1318 buf.buf);
1319
1320 if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1321 /* nested untracked file */
1322 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1323
1324 if (buf.buf[0] == 'u' ||
1325 buf.buf[0] == '2' ||
1326 memcmp(buf.buf + 5, "S..U", 4))
1327 /* other change */
1328 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1329 }
1330
1331 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1332 ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1333 ignore_untracked)) {
1334 /*
1335 * We're not interested in any further information from
1336 * the child any more, neither output nor its exit code.
1337 */
1338 ignore_cp_exit_code = 1;
1339 break;
1340 }
1341 }
1342 fclose(fp);
1343
1344 if (finish_command(&cp) && !ignore_cp_exit_code)
1345 die("'git status --porcelain=2' failed in submodule %s", path);
1346
1347 strbuf_release(&buf);
1348 return dirty_submodule;
1349 }
1350
1351 int submodule_uses_gitfile(const char *path)
1352 {
1353 struct child_process cp = CHILD_PROCESS_INIT;
1354 const char *argv[] = {
1355 "submodule",
1356 "foreach",
1357 "--quiet",
1358 "--recursive",
1359 "test -f .git",
1360 NULL,
1361 };
1362 struct strbuf buf = STRBUF_INIT;
1363 const char *git_dir;
1364
1365 strbuf_addf(&buf, "%s/.git", path);
1366 git_dir = read_gitfile(buf.buf);
1367 if (!git_dir) {
1368 strbuf_release(&buf);
1369 return 0;
1370 }
1371 strbuf_release(&buf);
1372
1373 /* Now test that all nested submodules use a gitfile too */
1374 cp.argv = argv;
1375 prepare_submodule_repo_env(&cp.env_array);
1376 cp.git_cmd = 1;
1377 cp.no_stdin = 1;
1378 cp.no_stderr = 1;
1379 cp.no_stdout = 1;
1380 cp.dir = path;
1381 if (run_command(&cp))
1382 return 0;
1383
1384 return 1;
1385 }
1386
1387 /*
1388 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1389 * when doing so.
1390 *
1391 * Return 1 if we'd lose data, return 0 if the removal is fine,
1392 * and negative values for errors.
1393 */
1394 int bad_to_remove_submodule(const char *path, unsigned flags)
1395 {
1396 ssize_t len;
1397 struct child_process cp = CHILD_PROCESS_INIT;
1398 struct strbuf buf = STRBUF_INIT;
1399 int ret = 0;
1400
1401 if (!file_exists(path) || is_empty_dir(path))
1402 return 0;
1403
1404 if (!submodule_uses_gitfile(path))
1405 return 1;
1406
1407 argv_array_pushl(&cp.args, "status", "--porcelain",
1408 "--ignore-submodules=none", NULL);
1409
1410 if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1411 argv_array_push(&cp.args, "-uno");
1412 else
1413 argv_array_push(&cp.args, "-uall");
1414
1415 if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1416 argv_array_push(&cp.args, "--ignored");
1417
1418 prepare_submodule_repo_env(&cp.env_array);
1419 cp.git_cmd = 1;
1420 cp.no_stdin = 1;
1421 cp.out = -1;
1422 cp.dir = path;
1423 if (start_command(&cp)) {
1424 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1425 die(_("could not start 'git status' in submodule '%s'"),
1426 path);
1427 ret = -1;
1428 goto out;
1429 }
1430
1431 len = strbuf_read(&buf, cp.out, 1024);
1432 if (len > 2)
1433 ret = 1;
1434 close(cp.out);
1435
1436 if (finish_command(&cp)) {
1437 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1438 die(_("could not run 'git status' in submodule '%s'"),
1439 path);
1440 ret = -1;
1441 }
1442 out:
1443 strbuf_release(&buf);
1444 return ret;
1445 }
1446
1447 static const char *get_super_prefix_or_empty(void)
1448 {
1449 const char *s = get_super_prefix();
1450 if (!s)
1451 s = "";
1452 return s;
1453 }
1454
1455 static int submodule_has_dirty_index(const struct submodule *sub)
1456 {
1457 struct child_process cp = CHILD_PROCESS_INIT;
1458
1459 prepare_submodule_repo_env(&cp.env_array);
1460
1461 cp.git_cmd = 1;
1462 argv_array_pushl(&cp.args, "diff-index", "--quiet",
1463 "--cached", "HEAD", NULL);
1464 cp.no_stdin = 1;
1465 cp.no_stdout = 1;
1466 cp.dir = sub->path;
1467 if (start_command(&cp))
1468 die("could not recurse into submodule '%s'", sub->path);
1469
1470 return finish_command(&cp);
1471 }
1472
1473 static void submodule_reset_index(const char *path)
1474 {
1475 struct child_process cp = CHILD_PROCESS_INIT;
1476 prepare_submodule_repo_env(&cp.env_array);
1477
1478 cp.git_cmd = 1;
1479 cp.no_stdin = 1;
1480 cp.dir = path;
1481
1482 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1483 get_super_prefix_or_empty(), path);
1484 argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1485
1486 argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1487
1488 if (run_command(&cp))
1489 die("could not reset submodule index");
1490 }
1491
1492 /**
1493 * Moves a submodule at a given path from a given head to another new head.
1494 * For edge cases (a submodule coming into existence or removing a submodule)
1495 * pass NULL for old or new respectively.
1496 */
1497 int submodule_move_head(const char *path,
1498 const char *old,
1499 const char *new,
1500 unsigned flags)
1501 {
1502 int ret = 0;
1503 struct child_process cp = CHILD_PROCESS_INIT;
1504 const struct submodule *sub;
1505 int *error_code_ptr, error_code;
1506
1507 if (!is_submodule_active(the_repository, path))
1508 return 0;
1509
1510 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1511 /*
1512 * Pass non NULL pointer to is_submodule_populated_gently
1513 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1514 * to fixup the submodule in the force case later.
1515 */
1516 error_code_ptr = &error_code;
1517 else
1518 error_code_ptr = NULL;
1519
1520 if (old && !is_submodule_populated_gently(path, error_code_ptr))
1521 return 0;
1522
1523 sub = submodule_from_path(&null_oid, path);
1524
1525 if (!sub)
1526 die("BUG: could not get submodule information for '%s'", path);
1527
1528 if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1529 /* Check if the submodule has a dirty index. */
1530 if (submodule_has_dirty_index(sub))
1531 return error(_("submodule '%s' has dirty index"), path);
1532 }
1533
1534 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1535 if (old) {
1536 if (!submodule_uses_gitfile(path))
1537 absorb_git_dir_into_superproject("", path,
1538 ABSORB_GITDIR_RECURSE_SUBMODULES);
1539 } else {
1540 char *gitdir = xstrfmt("%s/modules/%s",
1541 get_git_common_dir(), sub->name);
1542 connect_work_tree_and_git_dir(path, gitdir);
1543 free(gitdir);
1544
1545 /* make sure the index is clean as well */
1546 submodule_reset_index(path);
1547 }
1548
1549 if (old && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1550 char *gitdir = xstrfmt("%s/modules/%s",
1551 get_git_common_dir(), sub->name);
1552 connect_work_tree_and_git_dir(path, gitdir);
1553 free(gitdir);
1554 }
1555 }
1556
1557 prepare_submodule_repo_env(&cp.env_array);
1558
1559 cp.git_cmd = 1;
1560 cp.no_stdin = 1;
1561 cp.dir = path;
1562
1563 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1564 get_super_prefix_or_empty(), path);
1565 argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1566
1567 if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1568 argv_array_push(&cp.args, "-n");
1569 else
1570 argv_array_push(&cp.args, "-u");
1571
1572 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1573 argv_array_push(&cp.args, "--reset");
1574 else
1575 argv_array_push(&cp.args, "-m");
1576
1577 argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
1578 argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
1579
1580 if (run_command(&cp)) {
1581 ret = -1;
1582 goto out;
1583 }
1584
1585 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1586 if (new) {
1587 child_process_init(&cp);
1588 /* also set the HEAD accordingly */
1589 cp.git_cmd = 1;
1590 cp.no_stdin = 1;
1591 cp.dir = path;
1592
1593 prepare_submodule_repo_env(&cp.env_array);
1594 argv_array_pushl(&cp.args, "update-ref", "HEAD", new, NULL);
1595
1596 if (run_command(&cp)) {
1597 ret = -1;
1598 goto out;
1599 }
1600 } else {
1601 struct strbuf sb = STRBUF_INIT;
1602
1603 strbuf_addf(&sb, "%s/.git", path);
1604 unlink_or_warn(sb.buf);
1605 strbuf_release(&sb);
1606
1607 if (is_empty_dir(path))
1608 rmdir_or_warn(path);
1609 }
1610 }
1611 out:
1612 return ret;
1613 }
1614
1615 static int find_first_merges(struct object_array *result, const char *path,
1616 struct commit *a, struct commit *b)
1617 {
1618 int i, j;
1619 struct object_array merges = OBJECT_ARRAY_INIT;
1620 struct commit *commit;
1621 int contains_another;
1622
1623 char merged_revision[42];
1624 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1625 "--all", merged_revision, NULL };
1626 struct rev_info revs;
1627 struct setup_revision_opt rev_opts;
1628
1629 memset(result, 0, sizeof(struct object_array));
1630 memset(&rev_opts, 0, sizeof(rev_opts));
1631
1632 /* get all revisions that merge commit a */
1633 xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1634 oid_to_hex(&a->object.oid));
1635 init_revisions(&revs, NULL);
1636 rev_opts.submodule = path;
1637 /* FIXME: can't handle linked worktrees in submodules yet */
1638 revs.single_worktree = path != NULL;
1639 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1640
1641 /* save all revisions from the above list that contain b */
1642 if (prepare_revision_walk(&revs))
1643 die("revision walk setup failed");
1644 while ((commit = get_revision(&revs)) != NULL) {
1645 struct object *o = &(commit->object);
1646 if (in_merge_bases(b, commit))
1647 add_object_array(o, NULL, &merges);
1648 }
1649 reset_revision_walk();
1650
1651 /* Now we've got all merges that contain a and b. Prune all
1652 * merges that contain another found merge and save them in
1653 * result.
1654 */
1655 for (i = 0; i < merges.nr; i++) {
1656 struct commit *m1 = (struct commit *) merges.objects[i].item;
1657
1658 contains_another = 0;
1659 for (j = 0; j < merges.nr; j++) {
1660 struct commit *m2 = (struct commit *) merges.objects[j].item;
1661 if (i != j && in_merge_bases(m2, m1)) {
1662 contains_another = 1;
1663 break;
1664 }
1665 }
1666
1667 if (!contains_another)
1668 add_object_array(merges.objects[i].item, NULL, result);
1669 }
1670
1671 free(merges.objects);
1672 return result->nr;
1673 }
1674
1675 static void print_commit(struct commit *commit)
1676 {
1677 struct strbuf sb = STRBUF_INIT;
1678 struct pretty_print_context ctx = {0};
1679 ctx.date_mode.type = DATE_NORMAL;
1680 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1681 fprintf(stderr, "%s\n", sb.buf);
1682 strbuf_release(&sb);
1683 }
1684
1685 #define MERGE_WARNING(path, msg) \
1686 warning("Failed to merge submodule %s (%s)", path, msg);
1687
1688 int merge_submodule(struct object_id *result, const char *path,
1689 const struct object_id *base, const struct object_id *a,
1690 const struct object_id *b, int search)
1691 {
1692 struct commit *commit_base, *commit_a, *commit_b;
1693 int parent_count;
1694 struct object_array merges;
1695
1696 int i;
1697
1698 /* store a in result in case we fail */
1699 oidcpy(result, a);
1700
1701 /* we can not handle deletion conflicts */
1702 if (is_null_oid(base))
1703 return 0;
1704 if (is_null_oid(a))
1705 return 0;
1706 if (is_null_oid(b))
1707 return 0;
1708
1709 if (add_submodule_odb(path)) {
1710 MERGE_WARNING(path, "not checked out");
1711 return 0;
1712 }
1713
1714 if (!(commit_base = lookup_commit_reference(base)) ||
1715 !(commit_a = lookup_commit_reference(a)) ||
1716 !(commit_b = lookup_commit_reference(b))) {
1717 MERGE_WARNING(path, "commits not present");
1718 return 0;
1719 }
1720
1721 /* check whether both changes are forward */
1722 if (!in_merge_bases(commit_base, commit_a) ||
1723 !in_merge_bases(commit_base, commit_b)) {
1724 MERGE_WARNING(path, "commits don't follow merge-base");
1725 return 0;
1726 }
1727
1728 /* Case #1: a is contained in b or vice versa */
1729 if (in_merge_bases(commit_a, commit_b)) {
1730 oidcpy(result, b);
1731 return 1;
1732 }
1733 if (in_merge_bases(commit_b, commit_a)) {
1734 oidcpy(result, a);
1735 return 1;
1736 }
1737
1738 /*
1739 * Case #2: There are one or more merges that contain a and b in
1740 * the submodule. If there is only one, then present it as a
1741 * suggestion to the user, but leave it marked unmerged so the
1742 * user needs to confirm the resolution.
1743 */
1744
1745 /* Skip the search if makes no sense to the calling context. */
1746 if (!search)
1747 return 0;
1748
1749 /* find commit which merges them */
1750 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1751 switch (parent_count) {
1752 case 0:
1753 MERGE_WARNING(path, "merge following commits not found");
1754 break;
1755
1756 case 1:
1757 MERGE_WARNING(path, "not fast-forward");
1758 fprintf(stderr, "Found a possible merge resolution "
1759 "for the submodule:\n");
1760 print_commit((struct commit *) merges.objects[0].item);
1761 fprintf(stderr,
1762 "If this is correct simply add it to the index "
1763 "for example\n"
1764 "by using:\n\n"
1765 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1766 "which will accept this suggestion.\n",
1767 oid_to_hex(&merges.objects[0].item->oid), path);
1768 break;
1769
1770 default:
1771 MERGE_WARNING(path, "multiple merges found");
1772 for (i = 0; i < merges.nr; i++)
1773 print_commit((struct commit *) merges.objects[i].item);
1774 }
1775
1776 free(merges.objects);
1777 return 0;
1778 }
1779
1780 /*
1781 * Embeds a single submodules git directory into the superprojects git dir,
1782 * non recursively.
1783 */
1784 static void relocate_single_git_dir_into_superproject(const char *prefix,
1785 const char *path)
1786 {
1787 char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1788 const char *new_git_dir;
1789 const struct submodule *sub;
1790
1791 if (submodule_uses_worktrees(path))
1792 die(_("relocate_gitdir for submodule '%s' with "
1793 "more than one worktree not supported"), path);
1794
1795 old_git_dir = xstrfmt("%s/.git", path);
1796 if (read_gitfile(old_git_dir))
1797 /* If it is an actual gitfile, it doesn't need migration. */
1798 return;
1799
1800 real_old_git_dir = real_pathdup(old_git_dir, 1);
1801
1802 sub = submodule_from_path(&null_oid, path);
1803 if (!sub)
1804 die(_("could not lookup name for submodule '%s'"), path);
1805
1806 new_git_dir = git_path("modules/%s", sub->name);
1807 if (safe_create_leading_directories_const(new_git_dir) < 0)
1808 die(_("could not create directory '%s'"), new_git_dir);
1809 real_new_git_dir = real_pathdup(new_git_dir, 1);
1810
1811 fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1812 get_super_prefix_or_empty(), path,
1813 real_old_git_dir, real_new_git_dir);
1814
1815 relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1816
1817 free(old_git_dir);
1818 free(real_old_git_dir);
1819 free(real_new_git_dir);
1820 }
1821
1822 /*
1823 * Migrate the git directory of the submodule given by path from
1824 * having its git directory within the working tree to the git dir nested
1825 * in its superprojects git dir under modules/.
1826 */
1827 void absorb_git_dir_into_superproject(const char *prefix,
1828 const char *path,
1829 unsigned flags)
1830 {
1831 int err_code;
1832 const char *sub_git_dir;
1833 struct strbuf gitdir = STRBUF_INIT;
1834 strbuf_addf(&gitdir, "%s/.git", path);
1835 sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1836
1837 /* Not populated? */
1838 if (!sub_git_dir) {
1839 const struct submodule *sub;
1840
1841 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1842 /* unpopulated as expected */
1843 strbuf_release(&gitdir);
1844 return;
1845 }
1846
1847 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1848 /* We don't know what broke here. */
1849 read_gitfile_error_die(err_code, path, NULL);
1850
1851 /*
1852 * Maybe populated, but no git directory was found?
1853 * This can happen if the superproject is a submodule
1854 * itself and was just absorbed. The absorption of the
1855 * superproject did not rewrite the git file links yet,
1856 * fix it now.
1857 */
1858 sub = submodule_from_path(&null_oid, path);
1859 if (!sub)
1860 die(_("could not lookup name for submodule '%s'"), path);
1861 connect_work_tree_and_git_dir(path,
1862 git_path("modules/%s", sub->name));
1863 } else {
1864 /* Is it already absorbed into the superprojects git dir? */
1865 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1866 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1867
1868 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1869 relocate_single_git_dir_into_superproject(prefix, path);
1870
1871 free(real_sub_git_dir);
1872 free(real_common_git_dir);
1873 }
1874 strbuf_release(&gitdir);
1875
1876 if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1877 struct child_process cp = CHILD_PROCESS_INIT;
1878 struct strbuf sb = STRBUF_INIT;
1879
1880 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1881 die("BUG: we don't know how to pass the flags down?");
1882
1883 strbuf_addstr(&sb, get_super_prefix_or_empty());
1884 strbuf_addstr(&sb, path);
1885 strbuf_addch(&sb, '/');
1886
1887 cp.dir = path;
1888 cp.git_cmd = 1;
1889 cp.no_stdin = 1;
1890 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1891 "submodule--helper",
1892 "absorb-git-dirs", NULL);
1893 prepare_submodule_repo_env(&cp.env_array);
1894 if (run_command(&cp))
1895 die(_("could not recurse into submodule '%s'"), path);
1896
1897 strbuf_release(&sb);
1898 }
1899 }
1900
1901 const char *get_superproject_working_tree(void)
1902 {
1903 struct child_process cp = CHILD_PROCESS_INIT;
1904 struct strbuf sb = STRBUF_INIT;
1905 const char *one_up = real_path_if_valid("../");
1906 const char *cwd = xgetcwd();
1907 const char *ret = NULL;
1908 const char *subpath;
1909 int code;
1910 ssize_t len;
1911
1912 if (!is_inside_work_tree())
1913 /*
1914 * FIXME:
1915 * We might have a superproject, but it is harder
1916 * to determine.
1917 */
1918 return NULL;
1919
1920 if (!one_up)
1921 return NULL;
1922
1923 subpath = relative_path(cwd, one_up, &sb);
1924
1925 prepare_submodule_repo_env(&cp.env_array);
1926 argv_array_pop(&cp.env_array);
1927
1928 argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
1929 "ls-files", "-z", "--stage", "--full-name", "--",
1930 subpath, NULL);
1931 strbuf_reset(&sb);
1932
1933 cp.no_stdin = 1;
1934 cp.no_stderr = 1;
1935 cp.out = -1;
1936 cp.git_cmd = 1;
1937
1938 if (start_command(&cp))
1939 die(_("could not start ls-files in .."));
1940
1941 len = strbuf_read(&sb, cp.out, PATH_MAX);
1942 close(cp.out);
1943
1944 if (starts_with(sb.buf, "160000")) {
1945 int super_sub_len;
1946 int cwd_len = strlen(cwd);
1947 char *super_sub, *super_wt;
1948
1949 /*
1950 * There is a superproject having this repo as a submodule.
1951 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
1952 * We're only interested in the name after the tab.
1953 */
1954 super_sub = strchr(sb.buf, '\t') + 1;
1955 super_sub_len = sb.buf + sb.len - super_sub - 1;
1956
1957 if (super_sub_len > cwd_len ||
1958 strcmp(&cwd[cwd_len - super_sub_len], super_sub))
1959 die (_("BUG: returned path string doesn't match cwd?"));
1960
1961 super_wt = xstrdup(cwd);
1962 super_wt[cwd_len - super_sub_len] = '\0';
1963
1964 ret = real_path(super_wt);
1965 free(super_wt);
1966 }
1967 strbuf_release(&sb);
1968
1969 code = finish_command(&cp);
1970
1971 if (code == 128)
1972 /* '../' is not a git repository */
1973 return NULL;
1974 if (code == 0 && len == 0)
1975 /* There is an unrelated git repository at '../' */
1976 return NULL;
1977 if (code)
1978 die(_("ls-tree returned unexpected return code %d"), code);
1979
1980 return ret;
1981 }
1982
1983 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
1984 {
1985 const struct submodule *sub;
1986 const char *git_dir;
1987 int ret = 0;
1988
1989 strbuf_reset(buf);
1990 strbuf_addstr(buf, submodule);
1991 strbuf_complete(buf, '/');
1992 strbuf_addstr(buf, ".git");
1993
1994 git_dir = read_gitfile(buf->buf);
1995 if (git_dir) {
1996 strbuf_reset(buf);
1997 strbuf_addstr(buf, git_dir);
1998 }
1999 if (!is_git_directory(buf->buf)) {
2000 sub = submodule_from_path(&null_oid, submodule);
2001 if (!sub) {
2002 ret = -1;
2003 goto cleanup;
2004 }
2005 strbuf_reset(buf);
2006 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
2007 }
2008
2009 cleanup:
2010 return ret;
2011 }
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