Convert struct object to object_id
[git/git.git] / submodule.c
1 #include "cache.h"
2 #include "submodule-config.h"
3 #include "submodule.h"
4 #include "dir.h"
5 #include "diff.h"
6 #include "commit.h"
7 #include "revision.h"
8 #include "run-command.h"
9 #include "diffcore.h"
10 #include "refs.h"
11 #include "string-list.h"
12 #include "sha1-array.h"
13 #include "argv-array.h"
14 #include "blob.h"
15
16 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
17 static struct string_list changed_submodule_paths;
18 static int initialized_fetch_ref_tips;
19 static struct sha1_array ref_tips_before_fetch;
20 static struct sha1_array ref_tips_after_fetch;
21
22 /*
23 * The following flag is set if the .gitmodules file is unmerged. We then
24 * disable recursion for all submodules where .git/config doesn't have a
25 * matching config entry because we can't guess what might be configured in
26 * .gitmodules unless the user resolves the conflict. When a command line
27 * option is given (which always overrides configuration) this flag will be
28 * ignored.
29 */
30 static int gitmodules_is_unmerged;
31
32 /*
33 * This flag is set if the .gitmodules file had unstaged modifications on
34 * startup. This must be checked before allowing modifications to the
35 * .gitmodules file with the intention to stage them later, because when
36 * continuing we would stage the modifications the user didn't stage herself
37 * too. That might change in a future version when we learn to stage the
38 * changes we do ourselves without staging any previous modifications.
39 */
40 static int gitmodules_is_modified;
41
42 int is_staging_gitmodules_ok(void)
43 {
44 return !gitmodules_is_modified;
45 }
46
47 /*
48 * Try to update the "path" entry in the "submodule.<name>" section of the
49 * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
50 * with the correct path=<oldpath> setting was found and we could update it.
51 */
52 int update_path_in_gitmodules(const char *oldpath, const char *newpath)
53 {
54 struct strbuf entry = STRBUF_INIT;
55 const struct submodule *submodule;
56
57 if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
58 return -1;
59
60 if (gitmodules_is_unmerged)
61 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
62
63 submodule = submodule_from_path(null_sha1, oldpath);
64 if (!submodule || !submodule->name) {
65 warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
66 return -1;
67 }
68 strbuf_addstr(&entry, "submodule.");
69 strbuf_addstr(&entry, submodule->name);
70 strbuf_addstr(&entry, ".path");
71 if (git_config_set_in_file(".gitmodules", entry.buf, newpath) < 0) {
72 /* Maybe the user already did that, don't error out here */
73 warning(_("Could not update .gitmodules entry %s"), entry.buf);
74 strbuf_release(&entry);
75 return -1;
76 }
77 strbuf_release(&entry);
78 return 0;
79 }
80
81 /*
82 * Try to remove the "submodule.<name>" section from .gitmodules where the given
83 * path is configured. Return 0 only if a .gitmodules file was found, a section
84 * with the correct path=<path> setting was found and we could remove it.
85 */
86 int remove_path_from_gitmodules(const char *path)
87 {
88 struct strbuf sect = STRBUF_INIT;
89 const struct submodule *submodule;
90
91 if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
92 return -1;
93
94 if (gitmodules_is_unmerged)
95 die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
96
97 submodule = submodule_from_path(null_sha1, path);
98 if (!submodule || !submodule->name) {
99 warning(_("Could not find section in .gitmodules where path=%s"), path);
100 return -1;
101 }
102 strbuf_addstr(&sect, "submodule.");
103 strbuf_addstr(&sect, submodule->name);
104 if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
105 /* Maybe the user already did that, don't error out here */
106 warning(_("Could not remove .gitmodules entry for %s"), path);
107 strbuf_release(&sect);
108 return -1;
109 }
110 strbuf_release(&sect);
111 return 0;
112 }
113
114 void stage_updated_gitmodules(void)
115 {
116 if (add_file_to_cache(".gitmodules", 0))
117 die(_("staging updated .gitmodules failed"));
118 }
119
120 static int add_submodule_odb(const char *path)
121 {
122 struct strbuf objects_directory = STRBUF_INIT;
123 struct alternate_object_database *alt_odb;
124 int ret = 0;
125 int alloc;
126
127 strbuf_git_path_submodule(&objects_directory, path, "objects/");
128 if (!is_directory(objects_directory.buf)) {
129 ret = -1;
130 goto done;
131 }
132 /* avoid adding it twice */
133 prepare_alt_odb();
134 for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
135 if (alt_odb->name - alt_odb->base == objects_directory.len &&
136 !strncmp(alt_odb->base, objects_directory.buf,
137 objects_directory.len))
138 goto done;
139
140 alloc = objects_directory.len + 42; /* for "12/345..." sha1 */
141 alt_odb = xmalloc(sizeof(*alt_odb) + alloc);
142 alt_odb->next = alt_odb_list;
143 xsnprintf(alt_odb->base, alloc, "%s", objects_directory.buf);
144 alt_odb->name = alt_odb->base + objects_directory.len;
145 alt_odb->name[2] = '/';
146 alt_odb->name[40] = '\0';
147 alt_odb->name[41] = '\0';
148 alt_odb_list = alt_odb;
149
150 /* add possible alternates from the submodule */
151 read_info_alternates(objects_directory.buf, 0);
152 done:
153 strbuf_release(&objects_directory);
154 return ret;
155 }
156
157 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
158 const char *path)
159 {
160 const struct submodule *submodule = submodule_from_path(null_sha1, path);
161 if (submodule) {
162 if (submodule->ignore)
163 handle_ignore_submodules_arg(diffopt, submodule->ignore);
164 else if (gitmodules_is_unmerged)
165 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
166 }
167 }
168
169 int submodule_config(const char *var, const char *value, void *cb)
170 {
171 if (starts_with(var, "submodule."))
172 return parse_submodule_config_option(var, value);
173 else if (!strcmp(var, "fetch.recursesubmodules")) {
174 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
175 return 0;
176 }
177 return 0;
178 }
179
180 void gitmodules_config(void)
181 {
182 const char *work_tree = get_git_work_tree();
183 if (work_tree) {
184 struct strbuf gitmodules_path = STRBUF_INIT;
185 int pos;
186 strbuf_addstr(&gitmodules_path, work_tree);
187 strbuf_addstr(&gitmodules_path, "/.gitmodules");
188 if (read_cache() < 0)
189 die("index file corrupt");
190 pos = cache_name_pos(".gitmodules", 11);
191 if (pos < 0) { /* .gitmodules not found or isn't merged */
192 pos = -1 - pos;
193 if (active_nr > pos) { /* there is a .gitmodules */
194 const struct cache_entry *ce = active_cache[pos];
195 if (ce_namelen(ce) == 11 &&
196 !memcmp(ce->name, ".gitmodules", 11))
197 gitmodules_is_unmerged = 1;
198 }
199 } else if (pos < active_nr) {
200 struct stat st;
201 if (lstat(".gitmodules", &st) == 0 &&
202 ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
203 gitmodules_is_modified = 1;
204 }
205
206 if (!gitmodules_is_unmerged)
207 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
208 strbuf_release(&gitmodules_path);
209 }
210 }
211
212 void handle_ignore_submodules_arg(struct diff_options *diffopt,
213 const char *arg)
214 {
215 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
216 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
217 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
218
219 if (!strcmp(arg, "all"))
220 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
221 else if (!strcmp(arg, "untracked"))
222 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
223 else if (!strcmp(arg, "dirty"))
224 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
225 else if (strcmp(arg, "none"))
226 die("bad --ignore-submodules argument: %s", arg);
227 }
228
229 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
230 struct commit *left, struct commit *right,
231 int *fast_forward, int *fast_backward)
232 {
233 struct commit_list *merge_bases, *list;
234
235 init_revisions(rev, NULL);
236 setup_revisions(0, NULL, rev, NULL);
237 rev->left_right = 1;
238 rev->first_parent_only = 1;
239 left->object.flags |= SYMMETRIC_LEFT;
240 add_pending_object(rev, &left->object, path);
241 add_pending_object(rev, &right->object, path);
242 merge_bases = get_merge_bases(left, right);
243 if (merge_bases) {
244 if (merge_bases->item == left)
245 *fast_forward = 1;
246 else if (merge_bases->item == right)
247 *fast_backward = 1;
248 }
249 for (list = merge_bases; list; list = list->next) {
250 list->item->object.flags |= UNINTERESTING;
251 add_pending_object(rev, &list->item->object,
252 oid_to_hex(&list->item->object.oid));
253 }
254 return prepare_revision_walk(rev);
255 }
256
257 static void print_submodule_summary(struct rev_info *rev, FILE *f,
258 const char *line_prefix,
259 const char *del, const char *add, const char *reset)
260 {
261 static const char format[] = " %m %s";
262 struct strbuf sb = STRBUF_INIT;
263 struct commit *commit;
264
265 while ((commit = get_revision(rev))) {
266 struct pretty_print_context ctx = {0};
267 ctx.date_mode = rev->date_mode;
268 ctx.output_encoding = get_log_output_encoding();
269 strbuf_setlen(&sb, 0);
270 strbuf_addstr(&sb, line_prefix);
271 if (commit->object.flags & SYMMETRIC_LEFT) {
272 if (del)
273 strbuf_addstr(&sb, del);
274 }
275 else if (add)
276 strbuf_addstr(&sb, add);
277 format_commit_message(commit, format, &sb, &ctx);
278 if (reset)
279 strbuf_addstr(&sb, reset);
280 strbuf_addch(&sb, '\n');
281 fprintf(f, "%s", sb.buf);
282 }
283 strbuf_release(&sb);
284 }
285
286 void show_submodule_summary(FILE *f, const char *path,
287 const char *line_prefix,
288 unsigned char one[20], unsigned char two[20],
289 unsigned dirty_submodule, const char *meta,
290 const char *del, const char *add, const char *reset)
291 {
292 struct rev_info rev;
293 struct commit *left = NULL, *right = NULL;
294 const char *message = NULL;
295 struct strbuf sb = STRBUF_INIT;
296 int fast_forward = 0, fast_backward = 0;
297
298 if (is_null_sha1(two))
299 message = "(submodule deleted)";
300 else if (add_submodule_odb(path))
301 message = "(not checked out)";
302 else if (is_null_sha1(one))
303 message = "(new submodule)";
304 else if (!(left = lookup_commit_reference(one)) ||
305 !(right = lookup_commit_reference(two)))
306 message = "(commits not present)";
307 else if (prepare_submodule_summary(&rev, path, left, right,
308 &fast_forward, &fast_backward))
309 message = "(revision walker failed)";
310
311 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
312 fprintf(f, "%sSubmodule %s contains untracked content\n",
313 line_prefix, path);
314 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
315 fprintf(f, "%sSubmodule %s contains modified content\n",
316 line_prefix, path);
317
318 if (!hashcmp(one, two)) {
319 strbuf_release(&sb);
320 return;
321 }
322
323 strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
324 find_unique_abbrev(one, DEFAULT_ABBREV));
325 if (!fast_backward && !fast_forward)
326 strbuf_addch(&sb, '.');
327 strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
328 if (message)
329 strbuf_addf(&sb, " %s%s\n", message, reset);
330 else
331 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
332 fwrite(sb.buf, sb.len, 1, f);
333
334 if (!message) /* only NULL if we succeeded in setting up the walk */
335 print_submodule_summary(&rev, f, line_prefix, del, add, reset);
336 if (left)
337 clear_commit_marks(left, ~0);
338 if (right)
339 clear_commit_marks(right, ~0);
340
341 strbuf_release(&sb);
342 }
343
344 void set_config_fetch_recurse_submodules(int value)
345 {
346 config_fetch_recurse_submodules = value;
347 }
348
349 static int has_remote(const char *refname, const struct object_id *oid,
350 int flags, void *cb_data)
351 {
352 return 1;
353 }
354
355 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
356 {
357 if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
358 return 0;
359
360 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
361 struct child_process cp = CHILD_PROCESS_INIT;
362 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
363 struct strbuf buf = STRBUF_INIT;
364 int needs_pushing = 0;
365
366 argv[1] = sha1_to_hex(sha1);
367 cp.argv = argv;
368 cp.env = local_repo_env;
369 cp.git_cmd = 1;
370 cp.no_stdin = 1;
371 cp.out = -1;
372 cp.dir = path;
373 if (start_command(&cp))
374 die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
375 sha1_to_hex(sha1), path);
376 if (strbuf_read(&buf, cp.out, 41))
377 needs_pushing = 1;
378 finish_command(&cp);
379 close(cp.out);
380 strbuf_release(&buf);
381 return needs_pushing;
382 }
383
384 return 0;
385 }
386
387 static void collect_submodules_from_diff(struct diff_queue_struct *q,
388 struct diff_options *options,
389 void *data)
390 {
391 int i;
392 struct string_list *needs_pushing = data;
393
394 for (i = 0; i < q->nr; i++) {
395 struct diff_filepair *p = q->queue[i];
396 if (!S_ISGITLINK(p->two->mode))
397 continue;
398 if (submodule_needs_pushing(p->two->path, p->two->sha1))
399 string_list_insert(needs_pushing, p->two->path);
400 }
401 }
402
403 static void find_unpushed_submodule_commits(struct commit *commit,
404 struct string_list *needs_pushing)
405 {
406 struct rev_info rev;
407
408 init_revisions(&rev, NULL);
409 rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
410 rev.diffopt.format_callback = collect_submodules_from_diff;
411 rev.diffopt.format_callback_data = needs_pushing;
412 diff_tree_combined_merge(commit, 1, &rev);
413 }
414
415 int find_unpushed_submodules(unsigned char new_sha1[20],
416 const char *remotes_name, struct string_list *needs_pushing)
417 {
418 struct rev_info rev;
419 struct commit *commit;
420 const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
421 int argc = ARRAY_SIZE(argv) - 1;
422 char *sha1_copy;
423
424 struct strbuf remotes_arg = STRBUF_INIT;
425
426 strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
427 init_revisions(&rev, NULL);
428 sha1_copy = xstrdup(sha1_to_hex(new_sha1));
429 argv[1] = sha1_copy;
430 argv[3] = remotes_arg.buf;
431 setup_revisions(argc, argv, &rev, NULL);
432 if (prepare_revision_walk(&rev))
433 die("revision walk setup failed");
434
435 while ((commit = get_revision(&rev)) != NULL)
436 find_unpushed_submodule_commits(commit, needs_pushing);
437
438 reset_revision_walk();
439 free(sha1_copy);
440 strbuf_release(&remotes_arg);
441
442 return needs_pushing->nr;
443 }
444
445 static int push_submodule(const char *path)
446 {
447 if (add_submodule_odb(path))
448 return 1;
449
450 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
451 struct child_process cp = CHILD_PROCESS_INIT;
452 const char *argv[] = {"push", NULL};
453
454 cp.argv = argv;
455 cp.env = local_repo_env;
456 cp.git_cmd = 1;
457 cp.no_stdin = 1;
458 cp.dir = path;
459 if (run_command(&cp))
460 return 0;
461 close(cp.out);
462 }
463
464 return 1;
465 }
466
467 int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
468 {
469 int i, ret = 1;
470 struct string_list needs_pushing = STRING_LIST_INIT_DUP;
471
472 if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
473 return 1;
474
475 for (i = 0; i < needs_pushing.nr; i++) {
476 const char *path = needs_pushing.items[i].string;
477 fprintf(stderr, "Pushing submodule '%s'\n", path);
478 if (!push_submodule(path)) {
479 fprintf(stderr, "Unable to push submodule '%s'\n", path);
480 ret = 0;
481 }
482 }
483
484 string_list_clear(&needs_pushing, 0);
485
486 return ret;
487 }
488
489 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
490 {
491 int is_present = 0;
492 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
493 /* Even if the submodule is checked out and the commit is
494 * present, make sure it is reachable from a ref. */
495 struct child_process cp = CHILD_PROCESS_INIT;
496 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
497 struct strbuf buf = STRBUF_INIT;
498
499 argv[3] = sha1_to_hex(sha1);
500 cp.argv = argv;
501 cp.env = local_repo_env;
502 cp.git_cmd = 1;
503 cp.no_stdin = 1;
504 cp.dir = path;
505 if (!capture_command(&cp, &buf, 1024) && !buf.len)
506 is_present = 1;
507
508 strbuf_release(&buf);
509 }
510 return is_present;
511 }
512
513 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
514 struct diff_options *options,
515 void *data)
516 {
517 int i;
518 for (i = 0; i < q->nr; i++) {
519 struct diff_filepair *p = q->queue[i];
520 if (!S_ISGITLINK(p->two->mode))
521 continue;
522
523 if (S_ISGITLINK(p->one->mode)) {
524 /* NEEDSWORK: We should honor the name configured in
525 * the .gitmodules file of the commit we are examining
526 * here to be able to correctly follow submodules
527 * being moved around. */
528 struct string_list_item *path;
529 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
530 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
531 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
532 } else {
533 /* Submodule is new or was moved here */
534 /* NEEDSWORK: When the .git directories of submodules
535 * live inside the superprojects .git directory some
536 * day we should fetch new submodules directly into
537 * that location too when config or options request
538 * that so they can be checked out from there. */
539 continue;
540 }
541 }
542 }
543
544 static int add_sha1_to_array(const char *ref, const struct object_id *oid,
545 int flags, void *data)
546 {
547 sha1_array_append(data, oid->hash);
548 return 0;
549 }
550
551 void check_for_new_submodule_commits(unsigned char new_sha1[20])
552 {
553 if (!initialized_fetch_ref_tips) {
554 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
555 initialized_fetch_ref_tips = 1;
556 }
557
558 sha1_array_append(&ref_tips_after_fetch, new_sha1);
559 }
560
561 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
562 {
563 argv_array_push(data, sha1_to_hex(sha1));
564 }
565
566 static void calculate_changed_submodule_paths(void)
567 {
568 struct rev_info rev;
569 struct commit *commit;
570 struct argv_array argv = ARGV_ARRAY_INIT;
571
572 /* No need to check if there are no submodules configured */
573 if (!submodule_from_path(NULL, NULL))
574 return;
575
576 init_revisions(&rev, NULL);
577 argv_array_push(&argv, "--"); /* argv[0] program name */
578 sha1_array_for_each_unique(&ref_tips_after_fetch,
579 add_sha1_to_argv, &argv);
580 argv_array_push(&argv, "--not");
581 sha1_array_for_each_unique(&ref_tips_before_fetch,
582 add_sha1_to_argv, &argv);
583 setup_revisions(argv.argc, argv.argv, &rev, NULL);
584 if (prepare_revision_walk(&rev))
585 die("revision walk setup failed");
586
587 /*
588 * Collect all submodules (whether checked out or not) for which new
589 * commits have been recorded upstream in "changed_submodule_paths".
590 */
591 while ((commit = get_revision(&rev))) {
592 struct commit_list *parent = commit->parents;
593 while (parent) {
594 struct diff_options diff_opts;
595 diff_setup(&diff_opts);
596 DIFF_OPT_SET(&diff_opts, RECURSIVE);
597 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
598 diff_opts.format_callback = submodule_collect_changed_cb;
599 diff_setup_done(&diff_opts);
600 diff_tree_sha1(get_object_hash(parent->item->object), get_object_hash(commit->object), "", &diff_opts);
601 diffcore_std(&diff_opts);
602 diff_flush(&diff_opts);
603 parent = parent->next;
604 }
605 }
606
607 argv_array_clear(&argv);
608 sha1_array_clear(&ref_tips_before_fetch);
609 sha1_array_clear(&ref_tips_after_fetch);
610 initialized_fetch_ref_tips = 0;
611 }
612
613 int fetch_populated_submodules(const struct argv_array *options,
614 const char *prefix, int command_line_option,
615 int quiet)
616 {
617 int i, result = 0;
618 struct child_process cp = CHILD_PROCESS_INIT;
619 struct argv_array argv = ARGV_ARRAY_INIT;
620 const char *work_tree = get_git_work_tree();
621 if (!work_tree)
622 goto out;
623
624 if (read_cache() < 0)
625 die("index file corrupt");
626
627 argv_array_push(&argv, "fetch");
628 for (i = 0; i < options->argc; i++)
629 argv_array_push(&argv, options->argv[i]);
630 argv_array_push(&argv, "--recurse-submodules-default");
631 /* default value, "--submodule-prefix" and its value are added later */
632
633 cp.env = local_repo_env;
634 cp.git_cmd = 1;
635 cp.no_stdin = 1;
636
637 calculate_changed_submodule_paths();
638
639 for (i = 0; i < active_nr; i++) {
640 struct strbuf submodule_path = STRBUF_INIT;
641 struct strbuf submodule_git_dir = STRBUF_INIT;
642 struct strbuf submodule_prefix = STRBUF_INIT;
643 const struct cache_entry *ce = active_cache[i];
644 const char *git_dir, *default_argv;
645 const struct submodule *submodule;
646
647 if (!S_ISGITLINK(ce->ce_mode))
648 continue;
649
650 submodule = submodule_from_path(null_sha1, ce->name);
651 if (!submodule)
652 submodule = submodule_from_name(null_sha1, ce->name);
653
654 default_argv = "yes";
655 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
656 if (submodule &&
657 submodule->fetch_recurse !=
658 RECURSE_SUBMODULES_NONE) {
659 if (submodule->fetch_recurse ==
660 RECURSE_SUBMODULES_OFF)
661 continue;
662 if (submodule->fetch_recurse ==
663 RECURSE_SUBMODULES_ON_DEMAND) {
664 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
665 continue;
666 default_argv = "on-demand";
667 }
668 } else {
669 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
670 gitmodules_is_unmerged)
671 continue;
672 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
673 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
674 continue;
675 default_argv = "on-demand";
676 }
677 }
678 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
679 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
680 continue;
681 default_argv = "on-demand";
682 }
683
684 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
685 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
686 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
687 git_dir = read_gitfile(submodule_git_dir.buf);
688 if (!git_dir)
689 git_dir = submodule_git_dir.buf;
690 if (is_directory(git_dir)) {
691 if (!quiet)
692 printf("Fetching submodule %s%s\n", prefix, ce->name);
693 cp.dir = submodule_path.buf;
694 argv_array_push(&argv, default_argv);
695 argv_array_push(&argv, "--submodule-prefix");
696 argv_array_push(&argv, submodule_prefix.buf);
697 cp.argv = argv.argv;
698 if (run_command(&cp))
699 result = 1;
700 argv_array_pop(&argv);
701 argv_array_pop(&argv);
702 argv_array_pop(&argv);
703 }
704 strbuf_release(&submodule_path);
705 strbuf_release(&submodule_git_dir);
706 strbuf_release(&submodule_prefix);
707 }
708 argv_array_clear(&argv);
709 out:
710 string_list_clear(&changed_submodule_paths, 1);
711 return result;
712 }
713
714 unsigned is_submodule_modified(const char *path, int ignore_untracked)
715 {
716 ssize_t len;
717 struct child_process cp = CHILD_PROCESS_INIT;
718 const char *argv[] = {
719 "status",
720 "--porcelain",
721 NULL,
722 NULL,
723 };
724 struct strbuf buf = STRBUF_INIT;
725 unsigned dirty_submodule = 0;
726 const char *line, *next_line;
727 const char *git_dir;
728
729 strbuf_addf(&buf, "%s/.git", path);
730 git_dir = read_gitfile(buf.buf);
731 if (!git_dir)
732 git_dir = buf.buf;
733 if (!is_directory(git_dir)) {
734 strbuf_release(&buf);
735 /* The submodule is not checked out, so it is not modified */
736 return 0;
737
738 }
739 strbuf_reset(&buf);
740
741 if (ignore_untracked)
742 argv[2] = "-uno";
743
744 cp.argv = argv;
745 cp.env = local_repo_env;
746 cp.git_cmd = 1;
747 cp.no_stdin = 1;
748 cp.out = -1;
749 cp.dir = path;
750 if (start_command(&cp))
751 die("Could not run 'git status --porcelain' in submodule %s", path);
752
753 len = strbuf_read(&buf, cp.out, 1024);
754 line = buf.buf;
755 while (len > 2) {
756 if ((line[0] == '?') && (line[1] == '?')) {
757 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
758 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
759 break;
760 } else {
761 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
762 if (ignore_untracked ||
763 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
764 break;
765 }
766 next_line = strchr(line, '\n');
767 if (!next_line)
768 break;
769 next_line++;
770 len -= (next_line - line);
771 line = next_line;
772 }
773 close(cp.out);
774
775 if (finish_command(&cp))
776 die("'git status --porcelain' failed in submodule %s", path);
777
778 strbuf_release(&buf);
779 return dirty_submodule;
780 }
781
782 int submodule_uses_gitfile(const char *path)
783 {
784 struct child_process cp = CHILD_PROCESS_INIT;
785 const char *argv[] = {
786 "submodule",
787 "foreach",
788 "--quiet",
789 "--recursive",
790 "test -f .git",
791 NULL,
792 };
793 struct strbuf buf = STRBUF_INIT;
794 const char *git_dir;
795
796 strbuf_addf(&buf, "%s/.git", path);
797 git_dir = read_gitfile(buf.buf);
798 if (!git_dir) {
799 strbuf_release(&buf);
800 return 0;
801 }
802 strbuf_release(&buf);
803
804 /* Now test that all nested submodules use a gitfile too */
805 cp.argv = argv;
806 cp.env = local_repo_env;
807 cp.git_cmd = 1;
808 cp.no_stdin = 1;
809 cp.no_stderr = 1;
810 cp.no_stdout = 1;
811 cp.dir = path;
812 if (run_command(&cp))
813 return 0;
814
815 return 1;
816 }
817
818 int ok_to_remove_submodule(const char *path)
819 {
820 ssize_t len;
821 struct child_process cp = CHILD_PROCESS_INIT;
822 const char *argv[] = {
823 "status",
824 "--porcelain",
825 "-u",
826 "--ignore-submodules=none",
827 NULL,
828 };
829 struct strbuf buf = STRBUF_INIT;
830 int ok_to_remove = 1;
831
832 if (!file_exists(path) || is_empty_dir(path))
833 return 1;
834
835 if (!submodule_uses_gitfile(path))
836 return 0;
837
838 cp.argv = argv;
839 cp.env = local_repo_env;
840 cp.git_cmd = 1;
841 cp.no_stdin = 1;
842 cp.out = -1;
843 cp.dir = path;
844 if (start_command(&cp))
845 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
846
847 len = strbuf_read(&buf, cp.out, 1024);
848 if (len > 2)
849 ok_to_remove = 0;
850 close(cp.out);
851
852 if (finish_command(&cp))
853 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
854
855 strbuf_release(&buf);
856 return ok_to_remove;
857 }
858
859 static int find_first_merges(struct object_array *result, const char *path,
860 struct commit *a, struct commit *b)
861 {
862 int i, j;
863 struct object_array merges = OBJECT_ARRAY_INIT;
864 struct commit *commit;
865 int contains_another;
866
867 char merged_revision[42];
868 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
869 "--all", merged_revision, NULL };
870 struct rev_info revs;
871 struct setup_revision_opt rev_opts;
872
873 memset(result, 0, sizeof(struct object_array));
874 memset(&rev_opts, 0, sizeof(rev_opts));
875
876 /* get all revisions that merge commit a */
877 snprintf(merged_revision, sizeof(merged_revision), "^%s",
878 oid_to_hex(&a->object.oid));
879 init_revisions(&revs, NULL);
880 rev_opts.submodule = path;
881 setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
882
883 /* save all revisions from the above list that contain b */
884 if (prepare_revision_walk(&revs))
885 die("revision walk setup failed");
886 while ((commit = get_revision(&revs)) != NULL) {
887 struct object *o = &(commit->object);
888 if (in_merge_bases(b, commit))
889 add_object_array(o, NULL, &merges);
890 }
891 reset_revision_walk();
892
893 /* Now we've got all merges that contain a and b. Prune all
894 * merges that contain another found merge and save them in
895 * result.
896 */
897 for (i = 0; i < merges.nr; i++) {
898 struct commit *m1 = (struct commit *) merges.objects[i].item;
899
900 contains_another = 0;
901 for (j = 0; j < merges.nr; j++) {
902 struct commit *m2 = (struct commit *) merges.objects[j].item;
903 if (i != j && in_merge_bases(m2, m1)) {
904 contains_another = 1;
905 break;
906 }
907 }
908
909 if (!contains_another)
910 add_object_array(merges.objects[i].item, NULL, result);
911 }
912
913 free(merges.objects);
914 return result->nr;
915 }
916
917 static void print_commit(struct commit *commit)
918 {
919 struct strbuf sb = STRBUF_INIT;
920 struct pretty_print_context ctx = {0};
921 ctx.date_mode.type = DATE_NORMAL;
922 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
923 fprintf(stderr, "%s\n", sb.buf);
924 strbuf_release(&sb);
925 }
926
927 #define MERGE_WARNING(path, msg) \
928 warning("Failed to merge submodule %s (%s)", path, msg);
929
930 int merge_submodule(unsigned char result[20], const char *path,
931 const unsigned char base[20], const unsigned char a[20],
932 const unsigned char b[20], int search)
933 {
934 struct commit *commit_base, *commit_a, *commit_b;
935 int parent_count;
936 struct object_array merges;
937
938 int i;
939
940 /* store a in result in case we fail */
941 hashcpy(result, a);
942
943 /* we can not handle deletion conflicts */
944 if (is_null_sha1(base))
945 return 0;
946 if (is_null_sha1(a))
947 return 0;
948 if (is_null_sha1(b))
949 return 0;
950
951 if (add_submodule_odb(path)) {
952 MERGE_WARNING(path, "not checked out");
953 return 0;
954 }
955
956 if (!(commit_base = lookup_commit_reference(base)) ||
957 !(commit_a = lookup_commit_reference(a)) ||
958 !(commit_b = lookup_commit_reference(b))) {
959 MERGE_WARNING(path, "commits not present");
960 return 0;
961 }
962
963 /* check whether both changes are forward */
964 if (!in_merge_bases(commit_base, commit_a) ||
965 !in_merge_bases(commit_base, commit_b)) {
966 MERGE_WARNING(path, "commits don't follow merge-base");
967 return 0;
968 }
969
970 /* Case #1: a is contained in b or vice versa */
971 if (in_merge_bases(commit_a, commit_b)) {
972 hashcpy(result, b);
973 return 1;
974 }
975 if (in_merge_bases(commit_b, commit_a)) {
976 hashcpy(result, a);
977 return 1;
978 }
979
980 /*
981 * Case #2: There are one or more merges that contain a and b in
982 * the submodule. If there is only one, then present it as a
983 * suggestion to the user, but leave it marked unmerged so the
984 * user needs to confirm the resolution.
985 */
986
987 /* Skip the search if makes no sense to the calling context. */
988 if (!search)
989 return 0;
990
991 /* find commit which merges them */
992 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
993 switch (parent_count) {
994 case 0:
995 MERGE_WARNING(path, "merge following commits not found");
996 break;
997
998 case 1:
999 MERGE_WARNING(path, "not fast-forward");
1000 fprintf(stderr, "Found a possible merge resolution "
1001 "for the submodule:\n");
1002 print_commit((struct commit *) merges.objects[0].item);
1003 fprintf(stderr,
1004 "If this is correct simply add it to the index "
1005 "for example\n"
1006 "by using:\n\n"
1007 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
1008 "which will accept this suggestion.\n",
1009 oid_to_hex(&merges.objects[0].item->oid), path);
1010 break;
1011
1012 default:
1013 MERGE_WARNING(path, "multiple merges found");
1014 for (i = 0; i < merges.nr; i++)
1015 print_commit((struct commit *) merges.objects[i].item);
1016 }
1017
1018 free(merges.objects);
1019 return 0;
1020 }
1021
1022 /* Update gitfile and core.worktree setting to connect work tree and git dir */
1023 void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
1024 {
1025 struct strbuf file_name = STRBUF_INIT;
1026 struct strbuf rel_path = STRBUF_INIT;
1027 const char *real_work_tree = xstrdup(real_path(work_tree));
1028
1029 /* Update gitfile */
1030 strbuf_addf(&file_name, "%s/.git", work_tree);
1031 write_file(file_name.buf, "gitdir: %s",
1032 relative_path(git_dir, real_work_tree, &rel_path));
1033
1034 /* Update core.worktree setting */
1035 strbuf_reset(&file_name);
1036 strbuf_addf(&file_name, "%s/config", git_dir);
1037 if (git_config_set_in_file(file_name.buf, "core.worktree",
1038 relative_path(real_work_tree, git_dir,
1039 &rel_path)))
1040 die(_("Could not set core.worktree in %s"),
1041 file_name.buf);
1042
1043 strbuf_release(&file_name);
1044 strbuf_release(&rel_path);
1045 free((void *)real_work_tree);
1046 }