run_hook: use argv_array API
[git/git.git] / submodule.c
1 #include "cache.h"
2 #include "submodule.h"
3 #include "dir.h"
4 #include "diff.h"
5 #include "commit.h"
6 #include "revision.h"
7 #include "run-command.h"
8 #include "diffcore.h"
9 #include "refs.h"
10 #include "string-list.h"
11 #include "sha1-array.h"
12 #include "argv-array.h"
13
14 static struct string_list config_name_for_path;
15 static struct string_list config_fetch_recurse_submodules_for_name;
16 static struct string_list config_ignore_for_name;
17 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
18 static struct string_list changed_submodule_paths;
19 static int initialized_fetch_ref_tips;
20 static struct sha1_array ref_tips_before_fetch;
21 static struct sha1_array ref_tips_after_fetch;
22
23 /*
24 * The following flag is set if the .gitmodules file is unmerged. We then
25 * disable recursion for all submodules where .git/config doesn't have a
26 * matching config entry because we can't guess what might be configured in
27 * .gitmodules unless the user resolves the conflict. When a command line
28 * option is given (which always overrides configuration) this flag will be
29 * ignored.
30 */
31 static int gitmodules_is_unmerged;
32
33 static int add_submodule_odb(const char *path)
34 {
35 struct strbuf objects_directory = STRBUF_INIT;
36 struct alternate_object_database *alt_odb;
37 int ret = 0;
38 const char *git_dir;
39
40 strbuf_addf(&objects_directory, "%s/.git", path);
41 git_dir = read_gitfile_gently(objects_directory.buf);
42 if (git_dir) {
43 strbuf_reset(&objects_directory);
44 strbuf_addstr(&objects_directory, git_dir);
45 }
46 strbuf_addstr(&objects_directory, "/objects/");
47 if (!is_directory(objects_directory.buf)) {
48 ret = -1;
49 goto done;
50 }
51 /* avoid adding it twice */
52 for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
53 if (alt_odb->name - alt_odb->base == objects_directory.len &&
54 !strncmp(alt_odb->base, objects_directory.buf,
55 objects_directory.len))
56 goto done;
57
58 alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
59 alt_odb->next = alt_odb_list;
60 strcpy(alt_odb->base, objects_directory.buf);
61 alt_odb->name = alt_odb->base + objects_directory.len;
62 alt_odb->name[2] = '/';
63 alt_odb->name[40] = '\0';
64 alt_odb->name[41] = '\0';
65 alt_odb_list = alt_odb;
66 prepare_alt_odb();
67 done:
68 strbuf_release(&objects_directory);
69 return ret;
70 }
71
72 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
73 const char *path)
74 {
75 struct string_list_item *path_option, *ignore_option;
76 path_option = unsorted_string_list_lookup(&config_name_for_path, path);
77 if (path_option) {
78 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
79 if (ignore_option)
80 handle_ignore_submodules_arg(diffopt, ignore_option->util);
81 else if (gitmodules_is_unmerged)
82 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
83 }
84 }
85
86 int submodule_config(const char *var, const char *value, void *cb)
87 {
88 if (!prefixcmp(var, "submodule."))
89 return parse_submodule_config_option(var, value);
90 else if (!strcmp(var, "fetch.recursesubmodules")) {
91 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
92 return 0;
93 }
94 return 0;
95 }
96
97 void gitmodules_config(void)
98 {
99 const char *work_tree = get_git_work_tree();
100 if (work_tree) {
101 struct strbuf gitmodules_path = STRBUF_INIT;
102 int pos;
103 strbuf_addstr(&gitmodules_path, work_tree);
104 strbuf_addstr(&gitmodules_path, "/.gitmodules");
105 if (read_cache() < 0)
106 die("index file corrupt");
107 pos = cache_name_pos(".gitmodules", 11);
108 if (pos < 0) { /* .gitmodules not found or isn't merged */
109 pos = -1 - pos;
110 if (active_nr > pos) { /* there is a .gitmodules */
111 const struct cache_entry *ce = active_cache[pos];
112 if (ce_namelen(ce) == 11 &&
113 !memcmp(ce->name, ".gitmodules", 11))
114 gitmodules_is_unmerged = 1;
115 }
116 }
117
118 if (!gitmodules_is_unmerged)
119 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
120 strbuf_release(&gitmodules_path);
121 }
122 }
123
124 int parse_submodule_config_option(const char *var, const char *value)
125 {
126 int len;
127 struct string_list_item *config;
128 struct strbuf submodname = STRBUF_INIT;
129
130 var += 10; /* Skip "submodule." */
131
132 len = strlen(var);
133 if ((len > 5) && !strcmp(var + len - 5, ".path")) {
134 strbuf_add(&submodname, var, len - 5);
135 config = unsorted_string_list_lookup(&config_name_for_path, value);
136 if (config)
137 free(config->util);
138 else
139 config = string_list_append(&config_name_for_path, xstrdup(value));
140 config->util = strbuf_detach(&submodname, NULL);
141 strbuf_release(&submodname);
142 } else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
143 strbuf_add(&submodname, var, len - 23);
144 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
145 if (!config)
146 config = string_list_append(&config_fetch_recurse_submodules_for_name,
147 strbuf_detach(&submodname, NULL));
148 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
149 strbuf_release(&submodname);
150 } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
151 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
152 strcmp(value, "all") && strcmp(value, "none")) {
153 warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
154 return 0;
155 }
156
157 strbuf_add(&submodname, var, len - 7);
158 config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
159 if (config)
160 free(config->util);
161 else
162 config = string_list_append(&config_ignore_for_name,
163 strbuf_detach(&submodname, NULL));
164 strbuf_release(&submodname);
165 config->util = xstrdup(value);
166 return 0;
167 }
168 return 0;
169 }
170
171 void handle_ignore_submodules_arg(struct diff_options *diffopt,
172 const char *arg)
173 {
174 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
175 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
176 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
177
178 if (!strcmp(arg, "all"))
179 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
180 else if (!strcmp(arg, "untracked"))
181 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
182 else if (!strcmp(arg, "dirty"))
183 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
184 else if (strcmp(arg, "none"))
185 die("bad --ignore-submodules argument: %s", arg);
186 }
187
188 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
189 struct commit *left, struct commit *right,
190 int *fast_forward, int *fast_backward)
191 {
192 struct commit_list *merge_bases, *list;
193
194 init_revisions(rev, NULL);
195 setup_revisions(0, NULL, rev, NULL);
196 rev->left_right = 1;
197 rev->first_parent_only = 1;
198 left->object.flags |= SYMMETRIC_LEFT;
199 add_pending_object(rev, &left->object, path);
200 add_pending_object(rev, &right->object, path);
201 merge_bases = get_merge_bases(left, right, 1);
202 if (merge_bases) {
203 if (merge_bases->item == left)
204 *fast_forward = 1;
205 else if (merge_bases->item == right)
206 *fast_backward = 1;
207 }
208 for (list = merge_bases; list; list = list->next) {
209 list->item->object.flags |= UNINTERESTING;
210 add_pending_object(rev, &list->item->object,
211 sha1_to_hex(list->item->object.sha1));
212 }
213 return prepare_revision_walk(rev);
214 }
215
216 static void print_submodule_summary(struct rev_info *rev, FILE *f,
217 const char *del, const char *add, const char *reset)
218 {
219 static const char format[] = " %m %s";
220 struct strbuf sb = STRBUF_INIT;
221 struct commit *commit;
222
223 while ((commit = get_revision(rev))) {
224 struct pretty_print_context ctx = {0};
225 ctx.date_mode = rev->date_mode;
226 strbuf_setlen(&sb, 0);
227 if (commit->object.flags & SYMMETRIC_LEFT) {
228 if (del)
229 strbuf_addstr(&sb, del);
230 }
231 else if (add)
232 strbuf_addstr(&sb, add);
233 format_commit_message(commit, format, &sb, &ctx);
234 if (reset)
235 strbuf_addstr(&sb, reset);
236 strbuf_addch(&sb, '\n');
237 fprintf(f, "%s", sb.buf);
238 }
239 strbuf_release(&sb);
240 }
241
242 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
243 {
244 switch (git_config_maybe_bool(opt, arg)) {
245 case 1:
246 return RECURSE_SUBMODULES_ON;
247 case 0:
248 return RECURSE_SUBMODULES_OFF;
249 default:
250 if (!strcmp(arg, "on-demand"))
251 return RECURSE_SUBMODULES_ON_DEMAND;
252 die("bad %s argument: %s", opt, arg);
253 }
254 }
255
256 void show_submodule_summary(FILE *f, const char *path,
257 unsigned char one[20], unsigned char two[20],
258 unsigned dirty_submodule,
259 const char *del, const char *add, const char *reset)
260 {
261 struct rev_info rev;
262 struct commit *left = left, *right = right;
263 const char *message = NULL;
264 struct strbuf sb = STRBUF_INIT;
265 int fast_forward = 0, fast_backward = 0;
266
267 if (is_null_sha1(two))
268 message = "(submodule deleted)";
269 else if (add_submodule_odb(path))
270 message = "(not checked out)";
271 else if (is_null_sha1(one))
272 message = "(new submodule)";
273 else if (!(left = lookup_commit_reference(one)) ||
274 !(right = lookup_commit_reference(two)))
275 message = "(commits not present)";
276
277 if (!message &&
278 prepare_submodule_summary(&rev, path, left, right,
279 &fast_forward, &fast_backward))
280 message = "(revision walker failed)";
281
282 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
283 fprintf(f, "Submodule %s contains untracked content\n", path);
284 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
285 fprintf(f, "Submodule %s contains modified content\n", path);
286
287 if (!hashcmp(one, two)) {
288 strbuf_release(&sb);
289 return;
290 }
291
292 strbuf_addf(&sb, "Submodule %s %s..", path,
293 find_unique_abbrev(one, DEFAULT_ABBREV));
294 if (!fast_backward && !fast_forward)
295 strbuf_addch(&sb, '.');
296 strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
297 if (message)
298 strbuf_addf(&sb, " %s\n", message);
299 else
300 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
301 fwrite(sb.buf, sb.len, 1, f);
302
303 if (!message) {
304 print_submodule_summary(&rev, f, del, add, reset);
305 clear_commit_marks(left, ~0);
306 clear_commit_marks(right, ~0);
307 }
308
309 strbuf_release(&sb);
310 }
311
312 void set_config_fetch_recurse_submodules(int value)
313 {
314 config_fetch_recurse_submodules = value;
315 }
316
317 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
318 {
319 int is_present = 0;
320 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
321 /* Even if the submodule is checked out and the commit is
322 * present, make sure it is reachable from a ref. */
323 struct child_process cp;
324 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
325 struct strbuf buf = STRBUF_INIT;
326
327 argv[3] = sha1_to_hex(sha1);
328 memset(&cp, 0, sizeof(cp));
329 cp.argv = argv;
330 cp.env = local_repo_env;
331 cp.git_cmd = 1;
332 cp.no_stdin = 1;
333 cp.out = -1;
334 cp.dir = path;
335 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
336 is_present = 1;
337
338 close(cp.out);
339 strbuf_release(&buf);
340 }
341 return is_present;
342 }
343
344 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
345 struct diff_options *options,
346 void *data)
347 {
348 int i;
349 for (i = 0; i < q->nr; i++) {
350 struct diff_filepair *p = q->queue[i];
351 if (!S_ISGITLINK(p->two->mode))
352 continue;
353
354 if (S_ISGITLINK(p->one->mode)) {
355 /* NEEDSWORK: We should honor the name configured in
356 * the .gitmodules file of the commit we are examining
357 * here to be able to correctly follow submodules
358 * being moved around. */
359 struct string_list_item *path;
360 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
361 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
362 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
363 } else {
364 /* Submodule is new or was moved here */
365 /* NEEDSWORK: When the .git directories of submodules
366 * live inside the superprojects .git directory some
367 * day we should fetch new submodules directly into
368 * that location too when config or options request
369 * that so they can be checked out from there. */
370 continue;
371 }
372 }
373 }
374
375 static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
376 int flags, void *data)
377 {
378 sha1_array_append(data, sha1);
379 return 0;
380 }
381
382 void check_for_new_submodule_commits(unsigned char new_sha1[20])
383 {
384 if (!initialized_fetch_ref_tips) {
385 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
386 initialized_fetch_ref_tips = 1;
387 }
388
389 sha1_array_append(&ref_tips_after_fetch, new_sha1);
390 }
391
392 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
393 {
394 argv_array_push(data, sha1_to_hex(sha1));
395 }
396
397 static void calculate_changed_submodule_paths(void)
398 {
399 struct rev_info rev;
400 struct commit *commit;
401 struct argv_array argv = ARGV_ARRAY_INIT;
402
403 init_revisions(&rev, NULL);
404 argv_array_push(&argv, "--"); /* argv[0] program name */
405 sha1_array_for_each_unique(&ref_tips_after_fetch,
406 add_sha1_to_argv, &argv);
407 argv_array_push(&argv, "--not");
408 sha1_array_for_each_unique(&ref_tips_before_fetch,
409 add_sha1_to_argv, &argv);
410 setup_revisions(argv.argc, argv.argv, &rev, NULL);
411 if (prepare_revision_walk(&rev))
412 die("revision walk setup failed");
413
414 /*
415 * Collect all submodules (whether checked out or not) for which new
416 * commits have been recorded upstream in "changed_submodule_paths".
417 */
418 while ((commit = get_revision(&rev))) {
419 struct commit_list *parent = commit->parents;
420 while (parent) {
421 struct diff_options diff_opts;
422 diff_setup(&diff_opts);
423 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
424 diff_opts.format_callback = submodule_collect_changed_cb;
425 if (diff_setup_done(&diff_opts) < 0)
426 die("diff_setup_done failed");
427 diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
428 diffcore_std(&diff_opts);
429 diff_flush(&diff_opts);
430 parent = parent->next;
431 }
432 }
433
434 argv_array_clear(&argv);
435 sha1_array_clear(&ref_tips_before_fetch);
436 sha1_array_clear(&ref_tips_after_fetch);
437 initialized_fetch_ref_tips = 0;
438 }
439
440 int fetch_populated_submodules(int num_options, const char **options,
441 const char *prefix, int command_line_option,
442 int quiet)
443 {
444 int i, result = 0, argc = 0, default_argc;
445 struct child_process cp;
446 const char **argv;
447 struct string_list_item *name_for_path;
448 const char *work_tree = get_git_work_tree();
449 if (!work_tree)
450 goto out;
451
452 if (!the_index.initialized)
453 if (read_cache() < 0)
454 die("index file corrupt");
455
456 /* 6: "fetch" (options) --recurse-submodules-default default "--submodule-prefix" prefix NULL */
457 argv = xcalloc(num_options + 6, sizeof(const char *));
458 argv[argc++] = "fetch";
459 for (i = 0; i < num_options; i++)
460 argv[argc++] = options[i];
461 argv[argc++] = "--recurse-submodules-default";
462 default_argc = argc++;
463 argv[argc++] = "--submodule-prefix";
464
465 memset(&cp, 0, sizeof(cp));
466 cp.argv = argv;
467 cp.env = local_repo_env;
468 cp.git_cmd = 1;
469 cp.no_stdin = 1;
470
471 calculate_changed_submodule_paths();
472
473 for (i = 0; i < active_nr; i++) {
474 struct strbuf submodule_path = STRBUF_INIT;
475 struct strbuf submodule_git_dir = STRBUF_INIT;
476 struct strbuf submodule_prefix = STRBUF_INIT;
477 struct cache_entry *ce = active_cache[i];
478 const char *git_dir, *name, *default_argv;
479
480 if (!S_ISGITLINK(ce->ce_mode))
481 continue;
482
483 name = ce->name;
484 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
485 if (name_for_path)
486 name = name_for_path->util;
487
488 default_argv = "yes";
489 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
490 struct string_list_item *fetch_recurse_submodules_option;
491 fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
492 if (fetch_recurse_submodules_option) {
493 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
494 continue;
495 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
496 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
497 continue;
498 default_argv = "on-demand";
499 }
500 } else {
501 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
502 gitmodules_is_unmerged)
503 continue;
504 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
505 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
506 continue;
507 default_argv = "on-demand";
508 }
509 }
510 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
511 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
512 continue;
513 default_argv = "on-demand";
514 }
515
516 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
517 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
518 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
519 git_dir = read_gitfile_gently(submodule_git_dir.buf);
520 if (!git_dir)
521 git_dir = submodule_git_dir.buf;
522 if (is_directory(git_dir)) {
523 if (!quiet)
524 printf("Fetching submodule %s%s\n", prefix, ce->name);
525 cp.dir = submodule_path.buf;
526 argv[default_argc] = default_argv;
527 argv[argc] = submodule_prefix.buf;
528 if (run_command(&cp))
529 result = 1;
530 }
531 strbuf_release(&submodule_path);
532 strbuf_release(&submodule_git_dir);
533 strbuf_release(&submodule_prefix);
534 }
535 free(argv);
536 out:
537 string_list_clear(&changed_submodule_paths, 1);
538 return result;
539 }
540
541 unsigned is_submodule_modified(const char *path, int ignore_untracked)
542 {
543 ssize_t len;
544 struct child_process cp;
545 const char *argv[] = {
546 "status",
547 "--porcelain",
548 NULL,
549 NULL,
550 };
551 struct strbuf buf = STRBUF_INIT;
552 unsigned dirty_submodule = 0;
553 const char *line, *next_line;
554 const char *git_dir;
555
556 strbuf_addf(&buf, "%s/.git", path);
557 git_dir = read_gitfile_gently(buf.buf);
558 if (!git_dir)
559 git_dir = buf.buf;
560 if (!is_directory(git_dir)) {
561 strbuf_release(&buf);
562 /* The submodule is not checked out, so it is not modified */
563 return 0;
564
565 }
566 strbuf_reset(&buf);
567
568 if (ignore_untracked)
569 argv[2] = "-uno";
570
571 memset(&cp, 0, sizeof(cp));
572 cp.argv = argv;
573 cp.env = local_repo_env;
574 cp.git_cmd = 1;
575 cp.no_stdin = 1;
576 cp.out = -1;
577 cp.dir = path;
578 if (start_command(&cp))
579 die("Could not run git status --porcelain");
580
581 len = strbuf_read(&buf, cp.out, 1024);
582 line = buf.buf;
583 while (len > 2) {
584 if ((line[0] == '?') && (line[1] == '?')) {
585 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
586 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
587 break;
588 } else {
589 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
590 if (ignore_untracked ||
591 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
592 break;
593 }
594 next_line = strchr(line, '\n');
595 if (!next_line)
596 break;
597 next_line++;
598 len -= (next_line - line);
599 line = next_line;
600 }
601 close(cp.out);
602
603 if (finish_command(&cp))
604 die("git status --porcelain failed");
605
606 strbuf_release(&buf);
607 return dirty_submodule;
608 }
609
610 static int find_first_merges(struct object_array *result, const char *path,
611 struct commit *a, struct commit *b)
612 {
613 int i, j;
614 struct object_array merges;
615 struct commit *commit;
616 int contains_another;
617
618 char merged_revision[42];
619 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
620 "--all", merged_revision, NULL };
621 struct rev_info revs;
622 struct setup_revision_opt rev_opts;
623
624 memset(&merges, 0, sizeof(merges));
625 memset(result, 0, sizeof(struct object_array));
626 memset(&rev_opts, 0, sizeof(rev_opts));
627
628 /* get all revisions that merge commit a */
629 snprintf(merged_revision, sizeof(merged_revision), "^%s",
630 sha1_to_hex(a->object.sha1));
631 init_revisions(&revs, NULL);
632 rev_opts.submodule = path;
633 setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
634
635 /* save all revisions from the above list that contain b */
636 if (prepare_revision_walk(&revs))
637 die("revision walk setup failed");
638 while ((commit = get_revision(&revs)) != NULL) {
639 struct object *o = &(commit->object);
640 if (in_merge_bases(b, &commit, 1))
641 add_object_array(o, NULL, &merges);
642 }
643
644 /* Now we've got all merges that contain a and b. Prune all
645 * merges that contain another found merge and save them in
646 * result.
647 */
648 for (i = 0; i < merges.nr; i++) {
649 struct commit *m1 = (struct commit *) merges.objects[i].item;
650
651 contains_another = 0;
652 for (j = 0; j < merges.nr; j++) {
653 struct commit *m2 = (struct commit *) merges.objects[j].item;
654 if (i != j && in_merge_bases(m2, &m1, 1)) {
655 contains_another = 1;
656 break;
657 }
658 }
659
660 if (!contains_another)
661 add_object_array(merges.objects[i].item,
662 merges.objects[i].name, result);
663 }
664
665 free(merges.objects);
666 return result->nr;
667 }
668
669 static void print_commit(struct commit *commit)
670 {
671 struct strbuf sb = STRBUF_INIT;
672 struct pretty_print_context ctx = {0};
673 ctx.date_mode = DATE_NORMAL;
674 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
675 fprintf(stderr, "%s\n", sb.buf);
676 strbuf_release(&sb);
677 }
678
679 #define MERGE_WARNING(path, msg) \
680 warning("Failed to merge submodule %s (%s)", path, msg);
681
682 int merge_submodule(unsigned char result[20], const char *path,
683 const unsigned char base[20], const unsigned char a[20],
684 const unsigned char b[20])
685 {
686 struct commit *commit_base, *commit_a, *commit_b;
687 int parent_count;
688 struct object_array merges;
689
690 int i;
691
692 /* store a in result in case we fail */
693 hashcpy(result, a);
694
695 /* we can not handle deletion conflicts */
696 if (is_null_sha1(base))
697 return 0;
698 if (is_null_sha1(a))
699 return 0;
700 if (is_null_sha1(b))
701 return 0;
702
703 if (add_submodule_odb(path)) {
704 MERGE_WARNING(path, "not checked out");
705 return 0;
706 }
707
708 if (!(commit_base = lookup_commit_reference(base)) ||
709 !(commit_a = lookup_commit_reference(a)) ||
710 !(commit_b = lookup_commit_reference(b))) {
711 MERGE_WARNING(path, "commits not present");
712 return 0;
713 }
714
715 /* check whether both changes are forward */
716 if (!in_merge_bases(commit_base, &commit_a, 1) ||
717 !in_merge_bases(commit_base, &commit_b, 1)) {
718 MERGE_WARNING(path, "commits don't follow merge-base");
719 return 0;
720 }
721
722 /* Case #1: a is contained in b or vice versa */
723 if (in_merge_bases(commit_a, &commit_b, 1)) {
724 hashcpy(result, b);
725 return 1;
726 }
727 if (in_merge_bases(commit_b, &commit_a, 1)) {
728 hashcpy(result, a);
729 return 1;
730 }
731
732 /*
733 * Case #2: There are one or more merges that contain a and b in
734 * the submodule. If there is only one, then present it as a
735 * suggestion to the user, but leave it marked unmerged so the
736 * user needs to confirm the resolution.
737 */
738
739 /* find commit which merges them */
740 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
741 switch (parent_count) {
742 case 0:
743 MERGE_WARNING(path, "merge following commits not found");
744 break;
745
746 case 1:
747 MERGE_WARNING(path, "not fast-forward");
748 fprintf(stderr, "Found a possible merge resolution "
749 "for the submodule:\n");
750 print_commit((struct commit *) merges.objects[0].item);
751 fprintf(stderr,
752 "If this is correct simply add it to the index "
753 "for example\n"
754 "by using:\n\n"
755 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
756 "which will accept this suggestion.\n",
757 sha1_to_hex(merges.objects[0].item->sha1), path);
758 break;
759
760 default:
761 MERGE_WARNING(path, "multiple merges found");
762 for (i = 0; i < merges.nr; i++)
763 print_commit((struct commit *) merges.objects[i].item);
764 }
765
766 free(merges.objects);
767 return 0;
768 }