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t4015: prefer --color to -c color.diff=always
[git/debian.git] / submodule.c
blobda2b4848791382b30147cd8fe921996cfb8a92a7
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_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
24 static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
25 static int parallel_jobs = 1;
26 static struct string_list changed_submodule_paths = STRING_LIST_INIT_DUP;
27 static int initialized_fetch_ref_tips;
28 static struct oid_array ref_tips_before_fetch;
29 static struct oid_array ref_tips_after_fetch;
30
31 /*
32 * The following flag is set if the .gitmodules file is unmerged. We then
33 * disable recursion for all submodules where .git/config doesn't have a
34 * matching config entry because we can't guess what might be configured in
35 * .gitmodules unless the user resolves the conflict. When a command line
36 * option is given (which always overrides configuration) this flag will be
37 * ignored.
38 */
39 static int gitmodules_is_unmerged;
40
41 /*
42 * This flag is set if the .gitmodules file had unstaged modifications on
43 * startup. This must be checked before allowing modifications to the
44 * .gitmodules file with the intention to stage them later, because when
45 * continuing we would stage the modifications the user didn't stage herself
46 * too. That might change in a future version when we learn to stage the
47 * changes we do ourselves without staging any previous modifications.
48 */
49 static int gitmodules_is_modified;
50
51 int is_staging_gitmodules_ok(void)
52 {
53 return !gitmodules_is_modified;
54 }
55
56 /*
57 * Try to update the "path" entry in the "submodule.<name>" section of the
58 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
59 * with the correct path=<oldpath> setting was found and we could update it.
60 */
61 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
62 {
63 struct strbuf entry = STRBUF_INIT;
64 const struct submodule *submodule;
65
66 if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
67 return -1;
68
69 if (gitmodules_is_unmerged)
70 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
71
72 submodule = submodule_from_path(null_sha1, oldpath);
73 if (!submodule || !submodule->name) {
74 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
75 return -1;
76 }
77 strbuf_addstr(&entry, "submodule.");
78 strbuf_addstr(&entry, submodule->name);
79 strbuf_addstr(&entry, ".path");
80 if (git_config_set_in_file_gently(".gitmodules", entry.buf, newpath) < 0) {
81 /* Maybe the user already did that, don't error out here */
82 warning(_("Could not update .gitmodules entry %s"), entry.buf);
83 strbuf_release(&entry);
84 return -1;
85 }
86 strbuf_release(&entry);
87 return 0;
88 }
89
90 /*
91 * Try to remove the "submodule.<name>" section from .gitmodules where the given
92 * path is configured. Return 0 only if a .gitmodules file was found, a section
93 * with the correct path=<path> setting was found and we could remove it.
94 */
95 int remove_path_from_gitmodules(const char *path)
96 {
97 struct strbuf sect = STRBUF_INIT;
98 const struct submodule *submodule;
99
100 if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
101 return -1;
102
103 if (gitmodules_is_unmerged)
104 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
105
106 submodule = submodule_from_path(null_sha1, path);
107 if (!submodule || !submodule->name) {
108 warning(_("Could not find section in .gitmodules where path=%s"), path);
109 return -1;
110 }
111 strbuf_addstr(&sect, "submodule.");
112 strbuf_addstr(&sect, submodule->name);
113 if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
114 /* Maybe the user already did that, don't error out here */
115 warning(_("Could not remove .gitmodules entry for %s"), path);
116 strbuf_release(&sect);
117 return -1;
118 }
119 strbuf_release(&sect);
120 return 0;
121 }
122
123 void stage_updated_gitmodules(void)
124 {
125 if (add_file_to_cache(".gitmodules", 0))
126 die(_("staging updated .gitmodules failed"));
127 }
128
129 static int add_submodule_odb(const char *path)
130 {
131 struct strbuf objects_directory = STRBUF_INIT;
132 int ret = 0;
133
134 ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
135 if (ret)
136 goto done;
137 if (!is_directory(objects_directory.buf)) {
138 ret = -1;
139 goto done;
140 }
141 add_to_alternates_memory(objects_directory.buf);
142 done:
143 strbuf_release(&objects_directory);
144 return ret;
145 }
146
147 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
148 const char *path)
149 {
150 const struct submodule *submodule = submodule_from_path(null_sha1, path);
151 if (submodule) {
152 if (submodule->ignore)
153 handle_ignore_submodules_arg(diffopt, submodule->ignore);
154 else if (gitmodules_is_unmerged)
155 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
156 }
157 }
158
159 /* For loading from the .gitmodules file. */
160 static int git_modules_config(const char *var, const char *value, void *cb)
161 {
162 if (!strcmp(var, "submodule.fetchjobs")) {
163 parallel_jobs = git_config_int(var, value);
164 if (parallel_jobs < 0)
165 die(_("negative values not allowed for submodule.fetchJobs"));
166 return 0;
167 } else if (starts_with(var, "submodule."))
168 return parse_submodule_config_option(var, value);
169 else if (!strcmp(var, "fetch.recursesubmodules")) {
170 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
171 return 0;
172 }
173 return 0;
174 }
175
176 /* Loads all submodule settings from the config. */
177 int submodule_config(const char *var, const char *value, void *cb)
178 {
179 if (!strcmp(var, "submodule.recurse")) {
180 int v = git_config_bool(var, value) ?
181 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
182 config_update_recurse_submodules = v;
183 return 0;
184 } else {
185 return git_modules_config(var, value, cb);
186 }
187 }
188
189 /* Cheap function that only determines if we're interested in submodules at all */
190 int git_default_submodule_config(const char *var, const char *value, void *cb)
191 {
192 if (!strcmp(var, "submodule.recurse")) {
193 int v = git_config_bool(var, value) ?
194 RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
195 config_update_recurse_submodules = v;
196 }
197 return 0;
198 }
199
200 int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
201 const char *arg, int unset)
202 {
203 if (unset) {
204 config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
205 return 0;
206 }
207 if (arg)
208 config_update_recurse_submodules =
209 parse_update_recurse_submodules_arg(opt->long_name,
210 arg);
211 else
212 config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
213
214 return 0;
215 }
216
217 void load_submodule_cache(void)
218 {
219 if (config_update_recurse_submodules == RECURSE_SUBMODULES_OFF)
220 return;
221
222 gitmodules_config();
223 git_config(submodule_config, NULL);
224 }
225
226 void gitmodules_config(void)
227 {
228 const char *work_tree = get_git_work_tree();
229 if (work_tree) {
230 struct strbuf gitmodules_path = STRBUF_INIT;
231 int pos;
232 strbuf_addstr(&gitmodules_path, work_tree);
233 strbuf_addstr(&gitmodules_path, "/.gitmodules");
234 if (read_cache() < 0)
235 die("index file corrupt");
236 pos = cache_name_pos(".gitmodules", 11);
237 if (pos < 0) { /* .gitmodules not found or isn't merged */
238 pos = -1 - pos;
239 if (active_nr > pos) { /* there is a .gitmodules */
240 const struct cache_entry *ce = active_cache[pos];
241 if (ce_namelen(ce) == 11 &&
242 !memcmp(ce->name, ".gitmodules", 11))
243 gitmodules_is_unmerged = 1;
244 }
245 } else if (pos < active_nr) {
246 struct stat st;
247 if (lstat(".gitmodules", &st) == 0 &&
248 ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
249 gitmodules_is_modified = 1;
250 }
251
252 if (!gitmodules_is_unmerged)
253 git_config_from_file(git_modules_config,
254 gitmodules_path.buf, NULL);
255 strbuf_release(&gitmodules_path);
256 }
257 }
258
259 static int gitmodules_cb(const char *var, const char *value, void *data)
260 {
261 struct repository *repo = data;
262 return submodule_config_option(repo, var, value);
263 }
264
265 void repo_read_gitmodules(struct repository *repo)
266 {
267 char *gitmodules_path = repo_worktree_path(repo, ".gitmodules");
268
269 git_config_from_file(gitmodules_cb, gitmodules_path, repo);
270 free(gitmodules_path);
271 }
272
273 void gitmodules_config_sha1(const unsigned char *commit_sha1)
274 {
275 struct strbuf rev = STRBUF_INIT;
276 unsigned char sha1[20];
277
278 if (gitmodule_sha1_from_commit(commit_sha1, sha1, &rev)) {
279 git_config_from_blob_sha1(git_modules_config, rev.buf,
280 sha1, NULL);
281 }
282 strbuf_release(&rev);
283 }
284
285 /*
286 * Determine if a submodule has been initialized at a given 'path'
287 */
288 int is_submodule_active(struct repository *repo, const char *path)
289 {
290 int ret = 0;
291 char *key = NULL;
292 char *value = NULL;
293 const struct string_list *sl;
294 const struct submodule *module;
295
296 module = submodule_from_cache(repo, null_sha1, path);
297
298 /* early return if there isn't a path->module mapping */
299 if (!module)
300 return 0;
301
302 /* submodule.<name>.active is set */
303 key = xstrfmt("submodule.%s.active", module->name);
304 if (!repo_config_get_bool(repo, key, &ret)) {
305 free(key);
306 return ret;
307 }
308 free(key);
309
310 /* submodule.active is set */
311 sl = repo_config_get_value_multi(repo, "submodule.active");
312 if (sl) {
313 struct pathspec ps;
314 struct argv_array args = ARGV_ARRAY_INIT;
315 const struct string_list_item *item;
316
317 for_each_string_list_item(item, sl) {
318 argv_array_push(&args, item->string);
319 }
320
321 parse_pathspec(&ps, 0, 0, NULL, args.argv);
322 ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1);
323
324 argv_array_clear(&args);
325 clear_pathspec(&ps);
326 return ret;
327 }
328
329 /* fallback to checking if the URL is set */
330 key = xstrfmt("submodule.%s.url", module->name);
331 ret = !repo_config_get_string(repo, key, &value);
332
333 free(value);
334 free(key);
335 return ret;
336 }
337
338 int is_submodule_populated_gently(const char *path, int *return_error_code)
339 {
340 int ret = 0;
341 char *gitdir = xstrfmt("%s/.git", path);
342
343 if (resolve_gitdir_gently(gitdir, return_error_code))
344 ret = 1;
345
346 free(gitdir);
347 return ret;
348 }
349
350 /*
351 * Dies if the provided 'prefix' corresponds to an unpopulated submodule
352 */
353 void die_in_unpopulated_submodule(const struct index_state *istate,
354 const char *prefix)
355 {
356 int i, prefixlen;
357
358 if (!prefix)
359 return;
360
361 prefixlen = strlen(prefix);
362
363 for (i = 0; i < istate->cache_nr; i++) {
364 struct cache_entry *ce = istate->cache[i];
365 int ce_len = ce_namelen(ce);
366
367 if (!S_ISGITLINK(ce->ce_mode))
368 continue;
369 if (prefixlen <= ce_len)
370 continue;
371 if (strncmp(ce->name, prefix, ce_len))
372 continue;
373 if (prefix[ce_len] != '/')
374 continue;
375
376 die(_("in unpopulated submodule '%s'"), ce->name);
377 }
378 }
379
380 /*
381 * Dies if any paths in the provided pathspec descends into a submodule
382 */
383 void die_path_inside_submodule(const struct index_state *istate,
384 const struct pathspec *ps)
385 {
386 int i, j;
387
388 for (i = 0; i < istate->cache_nr; i++) {
389 struct cache_entry *ce = istate->cache[i];
390 int ce_len = ce_namelen(ce);
391
392 if (!S_ISGITLINK(ce->ce_mode))
393 continue;
394
395 for (j = 0; j < ps->nr ; j++) {
396 const struct pathspec_item *item = &ps->items[j];
397
398 if (item->len <= ce_len)
399 continue;
400 if (item->match[ce_len] != '/')
401 continue;
402 if (strncmp(ce->name, item->match, ce_len))
403 continue;
404 if (item->len == ce_len + 1)
405 continue;
406
407 die(_("Pathspec '%s' is in submodule '%.*s'"),
408 item->original, ce_len, ce->name);
409 }
410 }
411 }
412
413 int parse_submodule_update_strategy(const char *value,
414 struct submodule_update_strategy *dst)
415 {
416 free((void*)dst->command);
417 dst->command = NULL;
418 if (!strcmp(value, "none"))
419 dst->type = SM_UPDATE_NONE;
420 else if (!strcmp(value, "checkout"))
421 dst->type = SM_UPDATE_CHECKOUT;
422 else if (!strcmp(value, "rebase"))
423 dst->type = SM_UPDATE_REBASE;
424 else if (!strcmp(value, "merge"))
425 dst->type = SM_UPDATE_MERGE;
426 else if (skip_prefix(value, "!", &value)) {
427 dst->type = SM_UPDATE_COMMAND;
428 dst->command = xstrdup(value);
429 } else
430 return -1;
431 return 0;
432 }
433
434 const char *submodule_strategy_to_string(const struct submodule_update_strategy *s)
435 {
436 struct strbuf sb = STRBUF_INIT;
437 switch (s->type) {
438 case SM_UPDATE_CHECKOUT:
439 return "checkout";
440 case SM_UPDATE_MERGE:
441 return "merge";
442 case SM_UPDATE_REBASE:
443 return "rebase";
444 case SM_UPDATE_NONE:
445 return "none";
446 case SM_UPDATE_UNSPECIFIED:
447 return NULL;
448 case SM_UPDATE_COMMAND:
449 strbuf_addf(&sb, "!%s", s->command);
450 return strbuf_detach(&sb, NULL);
451 }
452 return NULL;
453 }
454
455 void handle_ignore_submodules_arg(struct diff_options *diffopt,
456 const char *arg)
457 {
458 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
459 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
460 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
461
462 if (!strcmp(arg, "all"))
463 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
464 else if (!strcmp(arg, "untracked"))
465 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
466 else if (!strcmp(arg, "dirty"))
467 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
468 else if (strcmp(arg, "none"))
469 die("bad --ignore-submodules argument: %s", arg);
470 }
471
472 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
473 struct commit *left, struct commit *right,
474 struct commit_list *merge_bases)
475 {
476 struct commit_list *list;
477
478 init_revisions(rev, NULL);
479 setup_revisions(0, NULL, rev, NULL);
480 rev->left_right = 1;
481 rev->first_parent_only = 1;
482 left->object.flags |= SYMMETRIC_LEFT;
483 add_pending_object(rev, &left->object, path);
484 add_pending_object(rev, &right->object, path);
485 for (list = merge_bases; list; list = list->next) {
486 list->item->object.flags |= UNINTERESTING;
487 add_pending_object(rev, &list->item->object,
488 oid_to_hex(&list->item->object.oid));
489 }
490 return prepare_revision_walk(rev);
491 }
492
493 static void print_submodule_summary(struct rev_info *rev, FILE *f,
494 const char *line_prefix,
495 const char *del, const char *add, const char *reset)
496 {
497 static const char format[] = " %m %s";
498 struct strbuf sb = STRBUF_INIT;
499 struct commit *commit;
500
501 while ((commit = get_revision(rev))) {
502 struct pretty_print_context ctx = {0};
503 ctx.date_mode = rev->date_mode;
504 ctx.output_encoding = get_log_output_encoding();
505 strbuf_setlen(&sb, 0);
506 strbuf_addstr(&sb, line_prefix);
507 if (commit->object.flags & SYMMETRIC_LEFT) {
508 if (del)
509 strbuf_addstr(&sb, del);
510 }
511 else if (add)
512 strbuf_addstr(&sb, add);
513 format_commit_message(commit, format, &sb, &ctx);
514 if (reset)
515 strbuf_addstr(&sb, reset);
516 strbuf_addch(&sb, '\n');
517 fprintf(f, "%s", sb.buf);
518 }
519 strbuf_release(&sb);
520 }
521
522 static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out)
523 {
524 const char * const *var;
525
526 for (var = local_repo_env; *var; var++) {
527 if (strcmp(*var, CONFIG_DATA_ENVIRONMENT))
528 argv_array_push(out, *var);
529 }
530 }
531
532 void prepare_submodule_repo_env(struct argv_array *out)
533 {
534 prepare_submodule_repo_env_no_git_dir(out);
535 argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT,
536 DEFAULT_GIT_DIR_ENVIRONMENT);
537 }
538
539 /* Helper function to display the submodule header line prior to the full
540 * summary output. If it can locate the submodule objects directory it will
541 * attempt to lookup both the left and right commits and put them into the
542 * left and right pointers.
543 */
544 static void show_submodule_header(FILE *f, const char *path,
545 const char *line_prefix,
546 struct object_id *one, struct object_id *two,
547 unsigned dirty_submodule, const char *meta,
548 const char *reset,
549 struct commit **left, struct commit **right,
550 struct commit_list **merge_bases)
551 {
552 const char *message = NULL;
553 struct strbuf sb = STRBUF_INIT;
554 int fast_forward = 0, fast_backward = 0;
555
556 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
557 fprintf(f, "%sSubmodule %s contains untracked content\n",
558 line_prefix, path);
559 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
560 fprintf(f, "%sSubmodule %s contains modified content\n",
561 line_prefix, path);
562
563 if (is_null_oid(one))
564 message = "(new submodule)";
565 else if (is_null_oid(two))
566 message = "(submodule deleted)";
567
568 if (add_submodule_odb(path)) {
569 if (!message)
570 message = "(not initialized)";
571 goto output_header;
572 }
573
574 /*
575 * Attempt to lookup the commit references, and determine if this is
576 * a fast forward or fast backwards update.
577 */
578 *left = lookup_commit_reference(one);
579 *right = lookup_commit_reference(two);
580
581 /*
582 * Warn about missing commits in the submodule project, but only if
583 * they aren't null.
584 */
585 if ((!is_null_oid(one) && !*left) ||
586 (!is_null_oid(two) && !*right))
587 message = "(commits not present)";
588
589 *merge_bases = get_merge_bases(*left, *right);
590 if (*merge_bases) {
591 if ((*merge_bases)->item == *left)
592 fast_forward = 1;
593 else if ((*merge_bases)->item == *right)
594 fast_backward = 1;
595 }
596
597 if (!oidcmp(one, two)) {
598 strbuf_release(&sb);
599 return;
600 }
601
602 output_header:
603 strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path);
604 strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV);
605 strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
606 strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV);
607 if (message)
608 strbuf_addf(&sb, " %s%s\n", message, reset);
609 else
610 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
611 fwrite(sb.buf, sb.len, 1, f);
612
613 strbuf_release(&sb);
614 }
615
616 void show_submodule_summary(FILE *f, const char *path,
617 const char *line_prefix,
618 struct object_id *one, struct object_id *two,
619 unsigned dirty_submodule, const char *meta,
620 const char *del, const char *add, const char *reset)
621 {
622 struct rev_info rev;
623 struct commit *left = NULL, *right = NULL;
624 struct commit_list *merge_bases = NULL;
625
626 show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
627 meta, reset, &left, &right, &merge_bases);
628
629 /*
630 * If we don't have both a left and a right pointer, there is no
631 * reason to try and display a summary. The header line should contain
632 * all the information the user needs.
633 */
634 if (!left || !right)
635 goto out;
636
637 /* Treat revision walker failure the same as missing commits */
638 if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) {
639 fprintf(f, "%s(revision walker failed)\n", line_prefix);
640 goto out;
641 }
642
643 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
644
645 out:
646 if (merge_bases)
647 free_commit_list(merge_bases);
648 clear_commit_marks(left, ~0);
649 clear_commit_marks(right, ~0);
650 }
651
652 void show_submodule_inline_diff(FILE *f, const char *path,
653 const char *line_prefix,
654 struct object_id *one, struct object_id *two,
655 unsigned dirty_submodule, const char *meta,
656 const char *del, const char *add, const char *reset,
657 const struct diff_options *o)
658 {
659 const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
660 struct commit *left = NULL, *right = NULL;
661 struct commit_list *merge_bases = NULL;
662 struct strbuf submodule_dir = STRBUF_INIT;
663 struct child_process cp = CHILD_PROCESS_INIT;
664
665 show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
666 meta, reset, &left, &right, &merge_bases);
667
668 /* We need a valid left and right commit to display a difference */
669 if (!(left || is_null_oid(one)) ||
670 !(right || is_null_oid(two)))
671 goto done;
672
673 if (left)
674 old = one;
675 if (right)
676 new = two;
677
678 fflush(f);
679 cp.git_cmd = 1;
680 cp.dir = path;
681 cp.out = dup(fileno(f));
682 cp.no_stdin = 1;
683
684 /* TODO: other options may need to be passed here. */
685 argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
686
687 argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
688 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
689 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
690 o->b_prefix, path);
691 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
692 o->a_prefix, path);
693 } else {
694 argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
695 o->a_prefix, path);
696 argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
697 o->b_prefix, path);
698 }
699 argv_array_push(&cp.args, oid_to_hex(old));
700 /*
701 * If the submodule has modified content, we will diff against the
702 * work tree, under the assumption that the user has asked for the
703 * diff format and wishes to actually see all differences even if they
704 * haven't yet been committed to the submodule yet.
705 */
706 if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
707 argv_array_push(&cp.args, oid_to_hex(new));
708
709 prepare_submodule_repo_env(&cp.env_array);
710 if (run_command(&cp))
711 fprintf(f, "(diff failed)\n");
712
713 done:
714 strbuf_release(&submodule_dir);
715 if (merge_bases)
716 free_commit_list(merge_bases);
717 if (left)
718 clear_commit_marks(left, ~0);
719 if (right)
720 clear_commit_marks(right, ~0);
721 }
722
723 void set_config_fetch_recurse_submodules(int value)
724 {
725 config_fetch_recurse_submodules = value;
726 }
727
728 int should_update_submodules(void)
729 {
730 return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
731 }
732
733 const struct submodule *submodule_from_ce(const struct cache_entry *ce)
734 {
735 if (!S_ISGITLINK(ce->ce_mode))
736 return NULL;
737
738 if (!should_update_submodules())
739 return NULL;
740
741 return submodule_from_path(null_sha1, ce->name);
742 }
743
744 static struct oid_array *submodule_commits(struct string_list *submodules,
745 const char *path)
746 {
747 struct string_list_item *item;
748
749 item = string_list_insert(submodules, path);
750 if (item->util)
751 return (struct oid_array *) item->util;
752
753 /* NEEDSWORK: should we have oid_array_init()? */
754 item->util = xcalloc(1, sizeof(struct oid_array));
755 return (struct oid_array *) item->util;
756 }
757
758 static void collect_changed_submodules_cb(struct diff_queue_struct *q,
759 struct diff_options *options,
760 void *data)
761 {
762 int i;
763 struct string_list *changed = data;
764
765 for (i = 0; i < q->nr; i++) {
766 struct diff_filepair *p = q->queue[i];
767 struct oid_array *commits;
768 if (!S_ISGITLINK(p->two->mode))
769 continue;
770
771 if (S_ISGITLINK(p->one->mode)) {
772 /*
773 * NEEDSWORK: We should honor the name configured in
774 * the .gitmodules file of the commit we are examining
775 * here to be able to correctly follow submodules
776 * being moved around.
777 */
778 commits = submodule_commits(changed, p->two->path);
779 oid_array_append(commits, &p->two->oid);
780 } else {
781 /* Submodule is new or was moved here */
782 /*
783 * NEEDSWORK: When the .git directories of submodules
784 * live inside the superprojects .git directory some
785 * day we should fetch new submodules directly into
786 * that location too when config or options request
787 * that so they can be checked out from there.
788 */
789 continue;
790 }
791 }
792 }
793
794 /*
795 * Collect the paths of submodules in 'changed' which have changed based on
796 * the revisions as specified in 'argv'. Each entry in 'changed' will also
797 * have a corresponding 'struct oid_array' (in the 'util' field) which lists
798 * what the submodule pointers were updated to during the change.
799 */
800 static void collect_changed_submodules(struct string_list *changed,
801 struct argv_array *argv)
802 {
803 struct rev_info rev;
804 const struct commit *commit;
805
806 init_revisions(&rev, NULL);
807 setup_revisions(argv->argc, argv->argv, &rev, NULL);
808 if (prepare_revision_walk(&rev))
809 die("revision walk setup failed");
810
811 while ((commit = get_revision(&rev))) {
812 struct rev_info diff_rev;
813
814 init_revisions(&diff_rev, NULL);
815 diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
816 diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
817 diff_rev.diffopt.format_callback_data = changed;
818 diff_tree_combined_merge(commit, 1, &diff_rev);
819 }
820
821 reset_revision_walk();
822 }
823
824 static void free_submodules_oids(struct string_list *submodules)
825 {
826 struct string_list_item *item;
827 for_each_string_list_item(item, submodules)
828 oid_array_clear((struct oid_array *) item->util);
829 string_list_clear(submodules, 1);
830 }
831
832 static int has_remote(const char *refname, const struct object_id *oid,
833 int flags, void *cb_data)
834 {
835 return 1;
836 }
837
838 static int append_oid_to_argv(const struct object_id *oid, void *data)
839 {
840 struct argv_array *argv = data;
841 argv_array_push(argv, oid_to_hex(oid));
842 return 0;
843 }
844
845 static int check_has_commit(const struct object_id *oid, void *data)
846 {
847 int *has_commit = data;
848
849 if (!lookup_commit_reference(oid))
850 *has_commit = 0;
851
852 return 0;
853 }
854
855 static int submodule_has_commits(const char *path, struct oid_array *commits)
856 {
857 int has_commit = 1;
858
859 /*
860 * Perform a cheap, but incorrect check for the existence of 'commits'.
861 * This is done by adding the submodule's object store to the in-core
862 * object store, and then querying for each commit's existence. If we
863 * do not have the commit object anywhere, there is no chance we have
864 * it in the object store of the correct submodule and have it
865 * reachable from a ref, so we can fail early without spawning rev-list
866 * which is expensive.
867 */
868 if (add_submodule_odb(path))
869 return 0;
870
871 oid_array_for_each_unique(commits, check_has_commit, &has_commit);
872
873 if (has_commit) {
874 /*
875 * Even if the submodule is checked out and the commit is
876 * present, make sure it exists in the submodule's object store
877 * and that it is reachable from a ref.
878 */
879 struct child_process cp = CHILD_PROCESS_INIT;
880 struct strbuf out = STRBUF_INIT;
881
882 argv_array_pushl(&cp.args, "rev-list", "-n", "1", NULL);
883 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
884 argv_array_pushl(&cp.args, "--not", "--all", NULL);
885
886 prepare_submodule_repo_env(&cp.env_array);
887 cp.git_cmd = 1;
888 cp.no_stdin = 1;
889 cp.dir = path;
890
891 if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
892 has_commit = 0;
893
894 strbuf_release(&out);
895 }
896
897 return has_commit;
898 }
899
900 static int submodule_needs_pushing(const char *path, struct oid_array *commits)
901 {
902 if (!submodule_has_commits(path, commits))
903 /*
904 * NOTE: We do consider it safe to return "no" here. The
905 * correct answer would be "We do not know" instead of
906 * "No push needed", but it is quite hard to change
907 * the submodule pointer without having the submodule
908 * around. If a user did however change the submodules
909 * without having the submodule around, this indicates
910 * an expert who knows what they are doing or a
911 * maintainer integrating work from other people. In
912 * both cases it should be safe to skip this check.
913 */
914 return 0;
915
916 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
917 struct child_process cp = CHILD_PROCESS_INIT;
918 struct strbuf buf = STRBUF_INIT;
919 int needs_pushing = 0;
920
921 argv_array_push(&cp.args, "rev-list");
922 oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
923 argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
924
925 prepare_submodule_repo_env(&cp.env_array);
926 cp.git_cmd = 1;
927 cp.no_stdin = 1;
928 cp.out = -1;
929 cp.dir = path;
930 if (start_command(&cp))
931 die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s",
932 path);
933 if (strbuf_read(&buf, cp.out, 41))
934 needs_pushing = 1;
935 finish_command(&cp);
936 close(cp.out);
937 strbuf_release(&buf);
938 return needs_pushing;
939 }
940
941 return 0;
942 }
943
944 int find_unpushed_submodules(struct oid_array *commits,
945 const char *remotes_name, struct string_list *needs_pushing)
946 {
947 struct string_list submodules = STRING_LIST_INIT_DUP;
948 struct string_list_item *submodule;
949 struct argv_array argv = ARGV_ARRAY_INIT;
950
951 /* argv.argv[0] will be ignored by setup_revisions */
952 argv_array_push(&argv, "find_unpushed_submodules");
953 oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
954 argv_array_push(&argv, "--not");
955 argv_array_pushf(&argv, "--remotes=%s", remotes_name);
956
957 collect_changed_submodules(&submodules, &argv);
958
959 for_each_string_list_item(submodule, &submodules) {
960 struct oid_array *commits = submodule->util;
961 const char *path = submodule->string;
962
963 if (submodule_needs_pushing(path, commits))
964 string_list_insert(needs_pushing, path);
965 }
966
967 free_submodules_oids(&submodules);
968 argv_array_clear(&argv);
969
970 return needs_pushing->nr;
971 }
972
973 static int push_submodule(const char *path,
974 const struct remote *remote,
975 const char **refspec, int refspec_nr,
976 const struct string_list *push_options,
977 int dry_run)
978 {
979 if (add_submodule_odb(path))
980 return 1;
981
982 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
983 struct child_process cp = CHILD_PROCESS_INIT;
984 argv_array_push(&cp.args, "push");
985 if (dry_run)
986 argv_array_push(&cp.args, "--dry-run");
987
988 if (push_options && push_options->nr) {
989 const struct string_list_item *item;
990 for_each_string_list_item(item, push_options)
991 argv_array_pushf(&cp.args, "--push-option=%s",
992 item->string);
993 }
994
995 if (remote->origin != REMOTE_UNCONFIGURED) {
996 int i;
997 argv_array_push(&cp.args, remote->name);
998 for (i = 0; i < refspec_nr; i++)
999 argv_array_push(&cp.args, refspec[i]);
1000 }
1001
1002 prepare_submodule_repo_env(&cp.env_array);
1003 cp.git_cmd = 1;
1004 cp.no_stdin = 1;
1005 cp.dir = path;
1006 if (run_command(&cp))
1007 return 0;
1008 close(cp.out);
1009 }
1010
1011 return 1;
1012 }
1013
1014 /*
1015 * Perform a check in the submodule to see if the remote and refspec work.
1016 * Die if the submodule can't be pushed.
1017 */
1018 static void submodule_push_check(const char *path, const struct remote *remote,
1019 const char **refspec, int refspec_nr)
1020 {
1021 struct child_process cp = CHILD_PROCESS_INIT;
1022 int i;
1023
1024 argv_array_push(&cp.args, "submodule--helper");
1025 argv_array_push(&cp.args, "push-check");
1026 argv_array_push(&cp.args, remote->name);
1027
1028 for (i = 0; i < refspec_nr; i++)
1029 argv_array_push(&cp.args, refspec[i]);
1030
1031 prepare_submodule_repo_env(&cp.env_array);
1032 cp.git_cmd = 1;
1033 cp.no_stdin = 1;
1034 cp.no_stdout = 1;
1035 cp.dir = path;
1036
1037 /*
1038 * Simply indicate if 'submodule--helper push-check' failed.
1039 * More detailed error information will be provided by the
1040 * child process.
1041 */
1042 if (run_command(&cp))
1043 die("process for submodule '%s' failed", path);
1044 }
1045
1046 int push_unpushed_submodules(struct oid_array *commits,
1047 const struct remote *remote,
1048 const char **refspec, int refspec_nr,
1049 const struct string_list *push_options,
1050 int dry_run)
1051 {
1052 int i, ret = 1;
1053 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1054
1055 if (!find_unpushed_submodules(commits, remote->name, &needs_pushing))
1056 return 1;
1057
1058 /*
1059 * Verify that the remote and refspec can be propagated to all
1060 * submodules. This check can be skipped if the remote and refspec
1061 * won't be propagated due to the remote being unconfigured (e.g. a URL
1062 * instead of a remote name).
1063 */
1064 if (remote->origin != REMOTE_UNCONFIGURED)
1065 for (i = 0; i < needs_pushing.nr; i++)
1066 submodule_push_check(needs_pushing.items[i].string,
1067 remote, refspec, refspec_nr);
1068
1069 /* Actually push the submodules */
1070 for (i = 0; i < needs_pushing.nr; i++) {
1071 const char *path = needs_pushing.items[i].string;
1072 fprintf(stderr, "Pushing submodule '%s'\n", path);
1073 if (!push_submodule(path, remote, refspec, refspec_nr,
1074 push_options, dry_run)) {
1075 fprintf(stderr, "Unable to push submodule '%s'\n", path);
1076 ret = 0;
1077 }
1078 }
1079
1080 string_list_clear(&needs_pushing, 0);
1081
1082 return ret;
1083 }
1084
1085 static int append_oid_to_array(const char *ref, const struct object_id *oid,
1086 int flags, void *data)
1087 {
1088 struct oid_array *array = data;
1089 oid_array_append(array, oid);
1090 return 0;
1091 }
1092
1093 void check_for_new_submodule_commits(struct object_id *oid)
1094 {
1095 if (!initialized_fetch_ref_tips) {
1096 for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
1097 initialized_fetch_ref_tips = 1;
1098 }
1099
1100 oid_array_append(&ref_tips_after_fetch, oid);
1101 }
1102
1103 static void calculate_changed_submodule_paths(void)
1104 {
1105 struct argv_array argv = ARGV_ARRAY_INIT;
1106 struct string_list changed_submodules = STRING_LIST_INIT_DUP;
1107 const struct string_list_item *item;
1108
1109 /* No need to check if there are no submodules configured */
1110 if (!submodule_from_path(NULL, NULL))
1111 return;
1112
1113 argv_array_push(&argv, "--"); /* argv[0] program name */
1114 oid_array_for_each_unique(&ref_tips_after_fetch,
1115 append_oid_to_argv, &argv);
1116 argv_array_push(&argv, "--not");
1117 oid_array_for_each_unique(&ref_tips_before_fetch,
1118 append_oid_to_argv, &argv);
1119
1120 /*
1121 * Collect all submodules (whether checked out or not) for which new
1122 * commits have been recorded upstream in "changed_submodule_paths".
1123 */
1124 collect_changed_submodules(&changed_submodules, &argv);
1125
1126 for_each_string_list_item(item, &changed_submodules) {
1127 struct oid_array *commits = item->util;
1128 const char *path = item->string;
1129
1130 if (!submodule_has_commits(path, commits))
1131 string_list_append(&changed_submodule_paths, path);
1132 }
1133
1134 free_submodules_oids(&changed_submodules);
1135 argv_array_clear(&argv);
1136 oid_array_clear(&ref_tips_before_fetch);
1137 oid_array_clear(&ref_tips_after_fetch);
1138 initialized_fetch_ref_tips = 0;
1139 }
1140
1141 struct submodule_parallel_fetch {
1142 int count;
1143 struct argv_array args;
1144 const char *work_tree;
1145 const char *prefix;
1146 int command_line_option;
1147 int quiet;
1148 int result;
1149 };
1150 #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0}
1151
1152 static int get_next_submodule(struct child_process *cp,
1153 struct strbuf *err, void *data, void **task_cb)
1154 {
1155 int ret = 0;
1156 struct submodule_parallel_fetch *spf = data;
1157
1158 for (; spf->count < active_nr; spf->count++) {
1159 struct strbuf submodule_path = STRBUF_INIT;
1160 struct strbuf submodule_git_dir = STRBUF_INIT;
1161 struct strbuf submodule_prefix = STRBUF_INIT;
1162 const struct cache_entry *ce = active_cache[spf->count];
1163 const char *git_dir, *default_argv;
1164 const struct submodule *submodule;
1165
1166 if (!S_ISGITLINK(ce->ce_mode))
1167 continue;
1168
1169 submodule = submodule_from_path(null_sha1, ce->name);
1170 if (!submodule)
1171 submodule = submodule_from_name(null_sha1, ce->name);
1172
1173 default_argv = "yes";
1174 if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) {
1175 if (submodule &&
1176 submodule->fetch_recurse !=
1177 RECURSE_SUBMODULES_NONE) {
1178 if (submodule->fetch_recurse ==
1179 RECURSE_SUBMODULES_OFF)
1180 continue;
1181 if (submodule->fetch_recurse ==
1182 RECURSE_SUBMODULES_ON_DEMAND) {
1183 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1184 continue;
1185 default_argv = "on-demand";
1186 }
1187 } else {
1188 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
1189 gitmodules_is_unmerged)
1190 continue;
1191 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
1192 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1193 continue;
1194 default_argv = "on-demand";
1195 }
1196 }
1197 } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
1198 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
1199 continue;
1200 default_argv = "on-demand";
1201 }
1202
1203 strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name);
1204 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
1205 strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name);
1206 git_dir = read_gitfile(submodule_git_dir.buf);
1207 if (!git_dir)
1208 git_dir = submodule_git_dir.buf;
1209 if (is_directory(git_dir)) {
1210 child_process_init(cp);
1211 cp->dir = strbuf_detach(&submodule_path, NULL);
1212 prepare_submodule_repo_env(&cp->env_array);
1213 cp->git_cmd = 1;
1214 if (!spf->quiet)
1215 strbuf_addf(err, "Fetching submodule %s%s\n",
1216 spf->prefix, ce->name);
1217 argv_array_init(&cp->args);
1218 argv_array_pushv(&cp->args, spf->args.argv);
1219 argv_array_push(&cp->args, default_argv);
1220 argv_array_push(&cp->args, "--submodule-prefix");
1221 argv_array_push(&cp->args, submodule_prefix.buf);
1222 ret = 1;
1223 }
1224 strbuf_release(&submodule_path);
1225 strbuf_release(&submodule_git_dir);
1226 strbuf_release(&submodule_prefix);
1227 if (ret) {
1228 spf->count++;
1229 return 1;
1230 }
1231 }
1232 return 0;
1233 }
1234
1235 static int fetch_start_failure(struct strbuf *err,
1236 void *cb, void *task_cb)
1237 {
1238 struct submodule_parallel_fetch *spf = cb;
1239
1240 spf->result = 1;
1241
1242 return 0;
1243 }
1244
1245 static int fetch_finish(int retvalue, struct strbuf *err,
1246 void *cb, void *task_cb)
1247 {
1248 struct submodule_parallel_fetch *spf = cb;
1249
1250 if (retvalue)
1251 spf->result = 1;
1252
1253 return 0;
1254 }
1255
1256 int fetch_populated_submodules(const struct argv_array *options,
1257 const char *prefix, int command_line_option,
1258 int quiet, int max_parallel_jobs)
1259 {
1260 int i;
1261 struct submodule_parallel_fetch spf = SPF_INIT;
1262
1263 spf.work_tree = get_git_work_tree();
1264 spf.command_line_option = command_line_option;
1265 spf.quiet = quiet;
1266 spf.prefix = prefix;
1267
1268 if (!spf.work_tree)
1269 goto out;
1270
1271 if (read_cache() < 0)
1272 die("index file corrupt");
1273
1274 argv_array_push(&spf.args, "fetch");
1275 for (i = 0; i < options->argc; i++)
1276 argv_array_push(&spf.args, options->argv[i]);
1277 argv_array_push(&spf.args, "--recurse-submodules-default");
1278 /* default value, "--submodule-prefix" and its value are added later */
1279
1280 if (max_parallel_jobs < 0)
1281 max_parallel_jobs = parallel_jobs;
1282
1283 calculate_changed_submodule_paths();
1284 run_processes_parallel(max_parallel_jobs,
1285 get_next_submodule,
1286 fetch_start_failure,
1287 fetch_finish,
1288 &spf);
1289
1290 argv_array_clear(&spf.args);
1291 out:
1292 string_list_clear(&changed_submodule_paths, 1);
1293 return spf.result;
1294 }
1295
1296 unsigned is_submodule_modified(const char *path, int ignore_untracked)
1297 {
1298 struct child_process cp = CHILD_PROCESS_INIT;
1299 struct strbuf buf = STRBUF_INIT;
1300 FILE *fp;
1301 unsigned dirty_submodule = 0;
1302 const char *git_dir;
1303 int ignore_cp_exit_code = 0;
1304
1305 strbuf_addf(&buf, "%s/.git", path);
1306 git_dir = read_gitfile(buf.buf);
1307 if (!git_dir)
1308 git_dir = buf.buf;
1309 if (!is_git_directory(git_dir)) {
1310 if (is_directory(git_dir))
1311 die(_("'%s' not recognized as a git repository"), git_dir);
1312 strbuf_release(&buf);
1313 /* The submodule is not checked out, so it is not modified */
1314 return 0;
1315 }
1316 strbuf_reset(&buf);
1317
1318 argv_array_pushl(&cp.args, "status", "--porcelain=2", NULL);
1319 if (ignore_untracked)
1320 argv_array_push(&cp.args, "-uno");
1321
1322 prepare_submodule_repo_env(&cp.env_array);
1323 cp.git_cmd = 1;
1324 cp.no_stdin = 1;
1325 cp.out = -1;
1326 cp.dir = path;
1327 if (start_command(&cp))
1328 die("Could not run 'git status --porcelain=2' in submodule %s", path);
1329
1330 fp = xfdopen(cp.out, "r");
1331 while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1332 /* regular untracked files */
1333 if (buf.buf[0] == '?')
1334 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1335
1336 if (buf.buf[0] == 'u' ||
1337 buf.buf[0] == '1' ||
1338 buf.buf[0] == '2') {
1339 /* T = line type, XY = status, SSSS = submodule state */
1340 if (buf.len < strlen("T XY SSSS"))
1341 die("BUG: invalid status --porcelain=2 line %s",
1342 buf.buf);
1343
1344 if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1345 /* nested untracked file */
1346 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
1347
1348 if (buf.buf[0] == 'u' ||
1349 buf.buf[0] == '2' ||
1350 memcmp(buf.buf + 5, "S..U", 4))
1351 /* other change */
1352 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
1353 }
1354
1355 if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1356 ((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
1357 ignore_untracked)) {
1358 /*
1359 * We're not interested in any further information from
1360 * the child any more, neither output nor its exit code.
1361 */
1362 ignore_cp_exit_code = 1;
1363 break;
1364 }
1365 }
1366 fclose(fp);
1367
1368 if (finish_command(&cp) && !ignore_cp_exit_code)
1369 die("'git status --porcelain=2' failed in submodule %s", path);
1370
1371 strbuf_release(&buf);
1372 return dirty_submodule;
1373 }
1374
1375 int submodule_uses_gitfile(const char *path)
1376 {
1377 struct child_process cp = CHILD_PROCESS_INIT;
1378 const char *argv[] = {
1379 "submodule",
1380 "foreach",
1381 "--quiet",
1382 "--recursive",
1383 "test -f .git",
1384 NULL,
1385 };
1386 struct strbuf buf = STRBUF_INIT;
1387 const char *git_dir;
1388
1389 strbuf_addf(&buf, "%s/.git", path);
1390 git_dir = read_gitfile(buf.buf);
1391 if (!git_dir) {
1392 strbuf_release(&buf);
1393 return 0;
1394 }
1395 strbuf_release(&buf);
1396
1397 /* Now test that all nested submodules use a gitfile too */
1398 cp.argv = argv;
1399 prepare_submodule_repo_env(&cp.env_array);
1400 cp.git_cmd = 1;
1401 cp.no_stdin = 1;
1402 cp.no_stderr = 1;
1403 cp.no_stdout = 1;
1404 cp.dir = path;
1405 if (run_command(&cp))
1406 return 0;
1407
1408 return 1;
1409 }
1410
1411 /*
1412 * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1413 * when doing so.
1414 *
1415 * Return 1 if we'd lose data, return 0 if the removal is fine,
1416 * and negative values for errors.
1417 */
1418 int bad_to_remove_submodule(const char *path, unsigned flags)
1419 {
1420 ssize_t len;
1421 struct child_process cp = CHILD_PROCESS_INIT;
1422 struct strbuf buf = STRBUF_INIT;
1423 int ret = 0;
1424
1425 if (!file_exists(path) || is_empty_dir(path))
1426 return 0;
1427
1428 if (!submodule_uses_gitfile(path))
1429 return 1;
1430
1431 argv_array_pushl(&cp.args, "status", "--porcelain",
1432 "--ignore-submodules=none", NULL);
1433
1434 if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
1435 argv_array_push(&cp.args, "-uno");
1436 else
1437 argv_array_push(&cp.args, "-uall");
1438
1439 if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
1440 argv_array_push(&cp.args, "--ignored");
1441
1442 prepare_submodule_repo_env(&cp.env_array);
1443 cp.git_cmd = 1;
1444 cp.no_stdin = 1;
1445 cp.out = -1;
1446 cp.dir = path;
1447 if (start_command(&cp)) {
1448 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1449 die(_("could not start 'git status' in submodule '%s'"),
1450 path);
1451 ret = -1;
1452 goto out;
1453 }
1454
1455 len = strbuf_read(&buf, cp.out, 1024);
1456 if (len > 2)
1457 ret = 1;
1458 close(cp.out);
1459
1460 if (finish_command(&cp)) {
1461 if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
1462 die(_("could not run 'git status' in submodule '%s'"),
1463 path);
1464 ret = -1;
1465 }
1466 out:
1467 strbuf_release(&buf);
1468 return ret;
1469 }
1470
1471 static const char *get_super_prefix_or_empty(void)
1472 {
1473 const char *s = get_super_prefix();
1474 if (!s)
1475 s = "";
1476 return s;
1477 }
1478
1479 static int submodule_has_dirty_index(const struct submodule *sub)
1480 {
1481 struct child_process cp = CHILD_PROCESS_INIT;
1482
1483 prepare_submodule_repo_env(&cp.env_array);
1484
1485 cp.git_cmd = 1;
1486 argv_array_pushl(&cp.args, "diff-index", "--quiet",
1487 "--cached", "HEAD", NULL);
1488 cp.no_stdin = 1;
1489 cp.no_stdout = 1;
1490 cp.dir = sub->path;
1491 if (start_command(&cp))
1492 die("could not recurse into submodule '%s'", sub->path);
1493
1494 return finish_command(&cp);
1495 }
1496
1497 static void submodule_reset_index(const char *path)
1498 {
1499 struct child_process cp = CHILD_PROCESS_INIT;
1500 prepare_submodule_repo_env(&cp.env_array);
1501
1502 cp.git_cmd = 1;
1503 cp.no_stdin = 1;
1504 cp.dir = path;
1505
1506 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1507 get_super_prefix_or_empty(), path);
1508 argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
1509
1510 argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX);
1511
1512 if (run_command(&cp))
1513 die("could not reset submodule index");
1514 }
1515
1516 /**
1517 * Moves a submodule at a given path from a given head to another new head.
1518 * For edge cases (a submodule coming into existence or removing a submodule)
1519 * pass NULL for old or new respectively.
1520 */
1521 int submodule_move_head(const char *path,
1522 const char *old,
1523 const char *new,
1524 unsigned flags)
1525 {
1526 int ret = 0;
1527 struct child_process cp = CHILD_PROCESS_INIT;
1528 const struct submodule *sub;
1529 int *error_code_ptr, error_code;
1530
1531 if (!is_submodule_active(the_repository, path))
1532 return 0;
1533
1534 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1535 /*
1536 * Pass non NULL pointer to is_submodule_populated_gently
1537 * to prevent die()-ing. We'll use connect_work_tree_and_git_dir
1538 * to fixup the submodule in the force case later.
1539 */
1540 error_code_ptr = &error_code;
1541 else
1542 error_code_ptr = NULL;
1543
1544 if (old && !is_submodule_populated_gently(path, error_code_ptr))
1545 return 0;
1546
1547 sub = submodule_from_path(null_sha1, path);
1548
1549 if (!sub)
1550 die("BUG: could not get submodule information for '%s'", path);
1551
1552 if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1553 /* Check if the submodule has a dirty index. */
1554 if (submodule_has_dirty_index(sub))
1555 return error(_("submodule '%s' has dirty index"), path);
1556 }
1557
1558 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1559 if (old) {
1560 if (!submodule_uses_gitfile(path))
1561 absorb_git_dir_into_superproject("", path,
1562 ABSORB_GITDIR_RECURSE_SUBMODULES);
1563 } else {
1564 char *gitdir = xstrfmt("%s/modules/%s",
1565 get_git_common_dir(), sub->name);
1566 connect_work_tree_and_git_dir(path, gitdir);
1567 free(gitdir);
1568
1569 /* make sure the index is clean as well */
1570 submodule_reset_index(path);
1571 }
1572
1573 if (old && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
1574 char *gitdir = xstrfmt("%s/modules/%s",
1575 get_git_common_dir(), sub->name);
1576 connect_work_tree_and_git_dir(path, gitdir);
1577 free(gitdir);
1578 }
1579 }
1580
1581 prepare_submodule_repo_env(&cp.env_array);
1582
1583 cp.git_cmd = 1;
1584 cp.no_stdin = 1;
1585 cp.dir = path;
1586
1587 argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
1588 get_super_prefix_or_empty(), path);
1589 argv_array_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
1590
1591 if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
1592 argv_array_push(&cp.args, "-n");
1593 else
1594 argv_array_push(&cp.args, "-u");
1595
1596 if (flags & SUBMODULE_MOVE_HEAD_FORCE)
1597 argv_array_push(&cp.args, "--reset");
1598 else
1599 argv_array_push(&cp.args, "-m");
1600
1601 argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX);
1602 argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX);
1603
1604 if (run_command(&cp)) {
1605 ret = -1;
1606 goto out;
1607 }
1608
1609 if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
1610 if (new) {
1611 child_process_init(&cp);
1612 /* also set the HEAD accordingly */
1613 cp.git_cmd = 1;
1614 cp.no_stdin = 1;
1615 cp.dir = path;
1616
1617 prepare_submodule_repo_env(&cp.env_array);
1618 argv_array_pushl(&cp.args, "update-ref", "HEAD", new, NULL);
1619
1620 if (run_command(&cp)) {
1621 ret = -1;
1622 goto out;
1623 }
1624 } else {
1625 struct strbuf sb = STRBUF_INIT;
1626
1627 strbuf_addf(&sb, "%s/.git", path);
1628 unlink_or_warn(sb.buf);
1629 strbuf_release(&sb);
1630
1631 if (is_empty_dir(path))
1632 rmdir_or_warn(path);
1633 }
1634 }
1635 out:
1636 return ret;
1637 }
1638
1639 static int find_first_merges(struct object_array *result, const char *path,
1640 struct commit *a, struct commit *b)
1641 {
1642 int i, j;
1643 struct object_array merges = OBJECT_ARRAY_INIT;
1644 struct commit *commit;
1645 int contains_another;
1646
1647 char merged_revision[42];
1648 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
1649 "--all", merged_revision, NULL };
1650 struct rev_info revs;
1651 struct setup_revision_opt rev_opts;
1652
1653 memset(result, 0, sizeof(struct object_array));
1654 memset(&rev_opts, 0, sizeof(rev_opts));
1655
1656 /* get all revisions that merge commit a */
1657 xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
1658 oid_to_hex(&a->object.oid));
1659 init_revisions(&revs, NULL);
1660 rev_opts.submodule = path;
1661 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
1662
1663 /* save all revisions from the above list that contain b */
1664 if (prepare_revision_walk(&revs))
1665 die("revision walk setup failed");
1666 while ((commit = get_revision(&revs)) != NULL) {
1667 struct object *o = &(commit->object);
1668 if (in_merge_bases(b, commit))
1669 add_object_array(o, NULL, &merges);
1670 }
1671 reset_revision_walk();
1672
1673 /* Now we've got all merges that contain a and b. Prune all
1674 * merges that contain another found merge and save them in
1675 * result.
1676 */
1677 for (i = 0; i < merges.nr; i++) {
1678 struct commit *m1 = (struct commit *) merges.objects[i].item;
1679
1680 contains_another = 0;
1681 for (j = 0; j < merges.nr; j++) {
1682 struct commit *m2 = (struct commit *) merges.objects[j].item;
1683 if (i != j && in_merge_bases(m2, m1)) {
1684 contains_another = 1;
1685 break;
1686 }
1687 }
1688
1689 if (!contains_another)
1690 add_object_array(merges.objects[i].item, NULL, result);
1691 }
1692
1693 free(merges.objects);
1694 return result->nr;
1695 }
1696
1697 static void print_commit(struct commit *commit)
1698 {
1699 struct strbuf sb = STRBUF_INIT;
1700 struct pretty_print_context ctx = {0};
1701 ctx.date_mode.type = DATE_NORMAL;
1702 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
1703 fprintf(stderr, "%s\n", sb.buf);
1704 strbuf_release(&sb);
1705 }
1706
1707 #define MERGE_WARNING(path, msg) \
1708 warning("Failed to merge submodule %s (%s)", path, msg);
1709
1710 int merge_submodule(struct object_id *result, const char *path,
1711 const struct object_id *base, const struct object_id *a,
1712 const struct object_id *b, int search)
1713 {
1714 struct commit *commit_base, *commit_a, *commit_b;
1715 int parent_count;
1716 struct object_array merges;
1717
1718 int i;
1719
1720 /* store a in result in case we fail */
1721 oidcpy(result, a);
1722
1723 /* we can not handle deletion conflicts */
1724 if (is_null_oid(base))
1725 return 0;
1726 if (is_null_oid(a))
1727 return 0;
1728 if (is_null_oid(b))
1729 return 0;
1730
1731 if (add_submodule_odb(path)) {
1732 MERGE_WARNING(path, "not checked out");
1733 return 0;
1734 }
1735
1736 if (!(commit_base = lookup_commit_reference(base)) ||
1737 !(commit_a = lookup_commit_reference(a)) ||
1738 !(commit_b = lookup_commit_reference(b))) {
1739 MERGE_WARNING(path, "commits not present");
1740 return 0;
1741 }
1742
1743 /* check whether both changes are forward */
1744 if (!in_merge_bases(commit_base, commit_a) ||
1745 !in_merge_bases(commit_base, commit_b)) {
1746 MERGE_WARNING(path, "commits don't follow merge-base");
1747 return 0;
1748 }
1749
1750 /* Case #1: a is contained in b or vice versa */
1751 if (in_merge_bases(commit_a, commit_b)) {
1752 oidcpy(result, b);
1753 return 1;
1754 }
1755 if (in_merge_bases(commit_b, commit_a)) {
1756 oidcpy(result, a);
1757 return 1;
1758 }
1759
1760 /*
1761 * Case #2: There are one or more merges that contain a and b in
1762 * the submodule. If there is only one, then present it as a
1763 * suggestion to the user, but leave it marked unmerged so the
1764 * user needs to confirm the resolution.
1765 */
1766
1767 /* Skip the search if makes no sense to the calling context. */
1768 if (!search)
1769 return 0;
1770
1771 /* find commit which merges them */
1772 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
1773 switch (parent_count) {
1774 case 0:
1775 MERGE_WARNING(path, "merge following commits not found");
1776 break;
1777
1778 case 1:
1779 MERGE_WARNING(path, "not fast-forward");
1780 fprintf(stderr, "Found a possible merge resolution "
1781 "for the submodule:\n");
1782 print_commit((struct commit *) merges.objects[0].item);
1783 fprintf(stderr,
1784 "If this is correct simply add it to the index "
1785 "for example\n"
1786 "by using:\n\n"
1787 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1788 "which will accept this suggestion.\n",
1789 oid_to_hex(&merges.objects[0].item->oid), path);
1790 break;
1791
1792 default:
1793 MERGE_WARNING(path, "multiple merges found");
1794 for (i = 0; i < merges.nr; i++)
1795 print_commit((struct commit *) merges.objects[i].item);
1796 }
1797
1798 free(merges.objects);
1799 return 0;
1800 }
1801
1802 int parallel_submodules(void)
1803 {
1804 return parallel_jobs;
1805 }
1806
1807 /*
1808 * Embeds a single submodules git directory into the superprojects git dir,
1809 * non recursively.
1810 */
1811 static void relocate_single_git_dir_into_superproject(const char *prefix,
1812 const char *path)
1813 {
1814 char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
1815 const char *new_git_dir;
1816 const struct submodule *sub;
1817
1818 if (submodule_uses_worktrees(path))
1819 die(_("relocate_gitdir for submodule '%s' with "
1820 "more than one worktree not supported"), path);
1821
1822 old_git_dir = xstrfmt("%s/.git", path);
1823 if (read_gitfile(old_git_dir))
1824 /* If it is an actual gitfile, it doesn't need migration. */
1825 return;
1826
1827 real_old_git_dir = real_pathdup(old_git_dir, 1);
1828
1829 sub = submodule_from_path(null_sha1, path);
1830 if (!sub)
1831 die(_("could not lookup name for submodule '%s'"), path);
1832
1833 new_git_dir = git_path("modules/%s", sub->name);
1834 if (safe_create_leading_directories_const(new_git_dir) < 0)
1835 die(_("could not create directory '%s'"), new_git_dir);
1836 real_new_git_dir = real_pathdup(new_git_dir, 1);
1837
1838 fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
1839 get_super_prefix_or_empty(), path,
1840 real_old_git_dir, real_new_git_dir);
1841
1842 relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
1843
1844 free(old_git_dir);
1845 free(real_old_git_dir);
1846 free(real_new_git_dir);
1847 }
1848
1849 /*
1850 * Migrate the git directory of the submodule given by path from
1851 * having its git directory within the working tree to the git dir nested
1852 * in its superprojects git dir under modules/.
1853 */
1854 void absorb_git_dir_into_superproject(const char *prefix,
1855 const char *path,
1856 unsigned flags)
1857 {
1858 int err_code;
1859 const char *sub_git_dir;
1860 struct strbuf gitdir = STRBUF_INIT;
1861 strbuf_addf(&gitdir, "%s/.git", path);
1862 sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
1863
1864 /* Not populated? */
1865 if (!sub_git_dir) {
1866 const struct submodule *sub;
1867
1868 if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
1869 /* unpopulated as expected */
1870 strbuf_release(&gitdir);
1871 return;
1872 }
1873
1874 if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
1875 /* We don't know what broke here. */
1876 read_gitfile_error_die(err_code, path, NULL);
1877
1878 /*
1879 * Maybe populated, but no git directory was found?
1880 * This can happen if the superproject is a submodule
1881 * itself and was just absorbed. The absorption of the
1882 * superproject did not rewrite the git file links yet,
1883 * fix it now.
1884 */
1885 sub = submodule_from_path(null_sha1, path);
1886 if (!sub)
1887 die(_("could not lookup name for submodule '%s'"), path);
1888 connect_work_tree_and_git_dir(path,
1889 git_path("modules/%s", sub->name));
1890 } else {
1891 /* Is it already absorbed into the superprojects git dir? */
1892 char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
1893 char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
1894
1895 if (!starts_with(real_sub_git_dir, real_common_git_dir))
1896 relocate_single_git_dir_into_superproject(prefix, path);
1897
1898 free(real_sub_git_dir);
1899 free(real_common_git_dir);
1900 }
1901 strbuf_release(&gitdir);
1902
1903 if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
1904 struct child_process cp = CHILD_PROCESS_INIT;
1905 struct strbuf sb = STRBUF_INIT;
1906
1907 if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES)
1908 die("BUG: we don't know how to pass the flags down?");
1909
1910 strbuf_addstr(&sb, get_super_prefix_or_empty());
1911 strbuf_addstr(&sb, path);
1912 strbuf_addch(&sb, '/');
1913
1914 cp.dir = path;
1915 cp.git_cmd = 1;
1916 cp.no_stdin = 1;
1917 argv_array_pushl(&cp.args, "--super-prefix", sb.buf,
1918 "submodule--helper",
1919 "absorb-git-dirs", NULL);
1920 prepare_submodule_repo_env(&cp.env_array);
1921 if (run_command(&cp))
1922 die(_("could not recurse into submodule '%s'"), path);
1923
1924 strbuf_release(&sb);
1925 }
1926 }
1927
1928 const char *get_superproject_working_tree(void)
1929 {
1930 struct child_process cp = CHILD_PROCESS_INIT;
1931 struct strbuf sb = STRBUF_INIT;
1932 const char *one_up = real_path_if_valid("../");
1933 const char *cwd = xgetcwd();
1934 const char *ret = NULL;
1935 const char *subpath;
1936 int code;
1937 ssize_t len;
1938
1939 if (!is_inside_work_tree())
1940 /*
1941 * FIXME:
1942 * We might have a superproject, but it is harder
1943 * to determine.
1944 */
1945 return NULL;
1946
1947 if (!one_up)
1948 return NULL;
1949
1950 subpath = relative_path(cwd, one_up, &sb);
1951
1952 prepare_submodule_repo_env(&cp.env_array);
1953 argv_array_pop(&cp.env_array);
1954
1955 argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
1956 "ls-files", "-z", "--stage", "--full-name", "--",
1957 subpath, NULL);
1958 strbuf_reset(&sb);
1959
1960 cp.no_stdin = 1;
1961 cp.no_stderr = 1;
1962 cp.out = -1;
1963 cp.git_cmd = 1;
1964
1965 if (start_command(&cp))
1966 die(_("could not start ls-files in .."));
1967
1968 len = strbuf_read(&sb, cp.out, PATH_MAX);
1969 close(cp.out);
1970
1971 if (starts_with(sb.buf, "160000")) {
1972 int super_sub_len;
1973 int cwd_len = strlen(cwd);
1974 char *super_sub, *super_wt;
1975
1976 /*
1977 * There is a superproject having this repo as a submodule.
1978 * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
1979 * We're only interested in the name after the tab.
1980 */
1981 super_sub = strchr(sb.buf, '\t') + 1;
1982 super_sub_len = sb.buf + sb.len - super_sub - 1;
1983
1984 if (super_sub_len > cwd_len ||
1985 strcmp(&cwd[cwd_len - super_sub_len], super_sub))
1986 die (_("BUG: returned path string doesn't match cwd?"));
1987
1988 super_wt = xstrdup(cwd);
1989 super_wt[cwd_len - super_sub_len] = '\0';
1990
1991 ret = real_path(super_wt);
1992 free(super_wt);
1993 }
1994 strbuf_release(&sb);
1995
1996 code = finish_command(&cp);
1997
1998 if (code == 128)
1999 /* '../' is not a git repository */
2000 return NULL;
2001 if (code == 0 && len == 0)
2002 /* There is an unrelated git repository at '../' */
2003 return NULL;
2004 if (code)
2005 die(_("ls-tree returned unexpected return code %d"), code);
2006
2007 return ret;
2008 }
2009
2010 int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
2011 {
2012 const struct submodule *sub;
2013 const char *git_dir;
2014 int ret = 0;
2015
2016 strbuf_reset(buf);
2017 strbuf_addstr(buf, submodule);
2018 strbuf_complete(buf, '/');
2019 strbuf_addstr(buf, ".git");
2020
2021 git_dir = read_gitfile(buf->buf);
2022 if (git_dir) {
2023 strbuf_reset(buf);
2024 strbuf_addstr(buf, git_dir);
2025 }
2026 if (!is_git_directory(buf->buf)) {
2027 gitmodules_config();
2028 sub = submodule_from_path(null_sha1, submodule);
2029 if (!sub) {
2030 ret = -1;
2031 goto cleanup;
2032 }
2033 strbuf_reset(buf);
2034 strbuf_git_path(buf, "%s/%s", "modules", sub->name);
2035 }
2036
2037 cleanup:
2038 return ret;
2039 }
git for Debian