submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / submodule.c
blob0b709bc2914335853e7525076f5e1d026d5dd779
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"
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;
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.
31 static int gitmodules_is_unmerged;
33 static int add_submodule_odb(const char *path)
35 struct strbuf objects_directory = STRBUF_INIT;
36 struct alternate_object_database *alt_odb;
37 int ret = 0;
38 const char *git_dir;
40 strbuf_addf(&objects_directory, "%s/.git", path);
41 git_dir = read_gitfile(objects_directory.buf);
42 if (git_dir) {
43 strbuf_reset(&objects_directory);
44 strbuf_addstr(&objects_directory, git_dir);
46 strbuf_addstr(&objects_directory, "/objects/");
47 if (!is_directory(objects_directory.buf)) {
48 ret = -1;
49 goto done;
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;
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;
72 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
73 const char *path)
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);
86 int submodule_config(const char *var, const char *value, void *cb)
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;
94 return 0;
97 void gitmodules_config(void)
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;
118 if (!gitmodules_is_unmerged)
119 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
120 strbuf_release(&gitmodules_path);
124 int parse_submodule_config_option(const char *var, const char *value)
126 int len;
127 struct string_list_item *config;
128 struct strbuf submodname = STRBUF_INIT;
130 var += 10; /* Skip "submodule." */
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;
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;
168 return 0;
171 void handle_ignore_submodules_arg(struct diff_options *diffopt,
172 const char *arg)
174 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
175 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
176 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
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);
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)
192 struct commit_list *merge_bases, *list;
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;
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));
213 return prepare_revision_walk(rev);
216 static void print_submodule_summary(struct rev_info *rev, FILE *f,
217 const char *del, const char *add, const char *reset)
219 static const char format[] = " %m %s";
220 struct strbuf sb = STRBUF_INIT;
221 struct commit *commit;
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);
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);
239 strbuf_release(&sb);
242 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
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);
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)
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;
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)";
277 if (!message &&
278 prepare_submodule_summary(&rev, path, left, right,
279 &fast_forward, &fast_backward))
280 message = "(revision walker failed)";
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);
287 if (!hashcmp(one, two)) {
288 strbuf_release(&sb);
289 return;
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);
303 if (!message) {
304 print_submodule_summary(&rev, f, del, add, reset);
305 clear_commit_marks(left, ~0);
306 clear_commit_marks(right, ~0);
309 strbuf_release(&sb);
312 void set_config_fetch_recurse_submodules(int value)
314 config_fetch_recurse_submodules = value;
317 static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
319 return 1;
322 static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
324 if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
325 return 0;
327 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
328 struct child_process cp;
329 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
330 struct strbuf buf = STRBUF_INIT;
331 int needs_pushing = 0;
333 argv[1] = sha1_to_hex(sha1);
334 memset(&cp, 0, sizeof(cp));
335 cp.argv = argv;
336 cp.env = local_repo_env;
337 cp.git_cmd = 1;
338 cp.no_stdin = 1;
339 cp.out = -1;
340 cp.dir = path;
341 if (start_command(&cp))
342 die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
343 sha1_to_hex(sha1), path);
344 if (strbuf_read(&buf, cp.out, 41))
345 needs_pushing = 1;
346 finish_command(&cp);
347 close(cp.out);
348 strbuf_release(&buf);
349 return needs_pushing;
352 return 0;
355 static void collect_submodules_from_diff(struct diff_queue_struct *q,
356 struct diff_options *options,
357 void *data)
359 int i;
360 int *needs_pushing = data;
362 for (i = 0; i < q->nr; i++) {
363 struct diff_filepair *p = q->queue[i];
364 if (!S_ISGITLINK(p->two->mode))
365 continue;
366 if (submodule_needs_pushing(p->two->path, p->two->sha1)) {
367 *needs_pushing = 1;
368 break;
374 static void commit_need_pushing(struct commit *commit, struct commit_list *parent, int *needs_pushing)
376 const unsigned char (*parents)[20];
377 unsigned int i, n;
378 struct rev_info rev;
380 n = commit_list_count(parent);
381 parents = xmalloc(n * sizeof(*parents));
383 for (i = 0; i < n; i++) {
384 hashcpy((unsigned char *)(parents + i), parent->item->object.sha1);
385 parent = parent->next;
388 init_revisions(&rev, NULL);
389 rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
390 rev.diffopt.format_callback = collect_submodules_from_diff;
391 rev.diffopt.format_callback_data = needs_pushing;
392 diff_tree_combined(commit->object.sha1, parents, n, 1, &rev);
394 free(parents);
397 int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remotes_name)
399 struct rev_info rev;
400 struct commit *commit;
401 const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
402 int argc = ARRAY_SIZE(argv) - 1;
403 char *sha1_copy;
404 int needs_pushing = 0;
405 struct strbuf remotes_arg = STRBUF_INIT;
407 strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
408 init_revisions(&rev, NULL);
409 sha1_copy = xstrdup(sha1_to_hex(new_sha1));
410 argv[1] = sha1_copy;
411 argv[3] = remotes_arg.buf;
412 setup_revisions(argc, argv, &rev, NULL);
413 if (prepare_revision_walk(&rev))
414 die("revision walk setup failed");
416 while ((commit = get_revision(&rev)) && !needs_pushing)
417 commit_need_pushing(commit, commit->parents, &needs_pushing);
419 free(sha1_copy);
420 strbuf_release(&remotes_arg);
422 return needs_pushing;
425 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
427 int is_present = 0;
428 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
429 /* Even if the submodule is checked out and the commit is
430 * present, make sure it is reachable from a ref. */
431 struct child_process cp;
432 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
433 struct strbuf buf = STRBUF_INIT;
435 argv[3] = sha1_to_hex(sha1);
436 memset(&cp, 0, sizeof(cp));
437 cp.argv = argv;
438 cp.env = local_repo_env;
439 cp.git_cmd = 1;
440 cp.no_stdin = 1;
441 cp.out = -1;
442 cp.dir = path;
443 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
444 is_present = 1;
446 close(cp.out);
447 strbuf_release(&buf);
449 return is_present;
452 static void submodule_collect_changed_cb(struct diff_queue_struct *q,
453 struct diff_options *options,
454 void *data)
456 int i;
457 for (i = 0; i < q->nr; i++) {
458 struct diff_filepair *p = q->queue[i];
459 if (!S_ISGITLINK(p->two->mode))
460 continue;
462 if (S_ISGITLINK(p->one->mode)) {
463 /* NEEDSWORK: We should honor the name configured in
464 * the .gitmodules file of the commit we are examining
465 * here to be able to correctly follow submodules
466 * being moved around. */
467 struct string_list_item *path;
468 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
469 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
470 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
471 } else {
472 /* Submodule is new or was moved here */
473 /* NEEDSWORK: When the .git directories of submodules
474 * live inside the superprojects .git directory some
475 * day we should fetch new submodules directly into
476 * that location too when config or options request
477 * that so they can be checked out from there. */
478 continue;
483 static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
484 int flags, void *data)
486 sha1_array_append(data, sha1);
487 return 0;
490 void check_for_new_submodule_commits(unsigned char new_sha1[20])
492 if (!initialized_fetch_ref_tips) {
493 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
494 initialized_fetch_ref_tips = 1;
497 sha1_array_append(&ref_tips_after_fetch, new_sha1);
500 static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
502 argv_array_push(data, sha1_to_hex(sha1));
505 static void calculate_changed_submodule_paths(void)
507 struct rev_info rev;
508 struct commit *commit;
509 struct argv_array argv = ARGV_ARRAY_INIT;
511 /* No need to check if there are no submodules configured */
512 if (!config_name_for_path.nr)
513 return;
515 init_revisions(&rev, NULL);
516 argv_array_push(&argv, "--"); /* argv[0] program name */
517 sha1_array_for_each_unique(&ref_tips_after_fetch,
518 add_sha1_to_argv, &argv);
519 argv_array_push(&argv, "--not");
520 sha1_array_for_each_unique(&ref_tips_before_fetch,
521 add_sha1_to_argv, &argv);
522 setup_revisions(argv.argc, argv.argv, &rev, NULL);
523 if (prepare_revision_walk(&rev))
524 die("revision walk setup failed");
527 * Collect all submodules (whether checked out or not) for which new
528 * commits have been recorded upstream in "changed_submodule_paths".
530 while ((commit = get_revision(&rev))) {
531 struct commit_list *parent = commit->parents;
532 while (parent) {
533 struct diff_options diff_opts;
534 diff_setup(&diff_opts);
535 DIFF_OPT_SET(&diff_opts, RECURSIVE);
536 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
537 diff_opts.format_callback = submodule_collect_changed_cb;
538 if (diff_setup_done(&diff_opts) < 0)
539 die("diff_setup_done failed");
540 diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
541 diffcore_std(&diff_opts);
542 diff_flush(&diff_opts);
543 parent = parent->next;
547 argv_array_clear(&argv);
548 sha1_array_clear(&ref_tips_before_fetch);
549 sha1_array_clear(&ref_tips_after_fetch);
550 initialized_fetch_ref_tips = 0;
553 int fetch_populated_submodules(int num_options, const char **options,
554 const char *prefix, int command_line_option,
555 int quiet)
557 int i, result = 0, argc = 0, default_argc;
558 struct child_process cp;
559 const char **argv;
560 struct string_list_item *name_for_path;
561 const char *work_tree = get_git_work_tree();
562 if (!work_tree)
563 goto out;
565 if (!the_index.initialized)
566 if (read_cache() < 0)
567 die("index file corrupt");
569 /* 6: "fetch" (options) --recurse-submodules-default default "--submodule-prefix" prefix NULL */
570 argv = xcalloc(num_options + 6, sizeof(const char *));
571 argv[argc++] = "fetch";
572 for (i = 0; i < num_options; i++)
573 argv[argc++] = options[i];
574 argv[argc++] = "--recurse-submodules-default";
575 default_argc = argc++;
576 argv[argc++] = "--submodule-prefix";
578 memset(&cp, 0, sizeof(cp));
579 cp.argv = argv;
580 cp.env = local_repo_env;
581 cp.git_cmd = 1;
582 cp.no_stdin = 1;
584 calculate_changed_submodule_paths();
586 for (i = 0; i < active_nr; i++) {
587 struct strbuf submodule_path = STRBUF_INIT;
588 struct strbuf submodule_git_dir = STRBUF_INIT;
589 struct strbuf submodule_prefix = STRBUF_INIT;
590 struct cache_entry *ce = active_cache[i];
591 const char *git_dir, *name, *default_argv;
593 if (!S_ISGITLINK(ce->ce_mode))
594 continue;
596 name = ce->name;
597 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
598 if (name_for_path)
599 name = name_for_path->util;
601 default_argv = "yes";
602 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
603 struct string_list_item *fetch_recurse_submodules_option;
604 fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
605 if (fetch_recurse_submodules_option) {
606 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
607 continue;
608 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
609 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
610 continue;
611 default_argv = "on-demand";
613 } else {
614 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
615 gitmodules_is_unmerged)
616 continue;
617 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
618 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
619 continue;
620 default_argv = "on-demand";
623 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
624 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
625 continue;
626 default_argv = "on-demand";
629 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
630 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
631 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
632 git_dir = read_gitfile(submodule_git_dir.buf);
633 if (!git_dir)
634 git_dir = submodule_git_dir.buf;
635 if (is_directory(git_dir)) {
636 if (!quiet)
637 printf("Fetching submodule %s%s\n", prefix, ce->name);
638 cp.dir = submodule_path.buf;
639 argv[default_argc] = default_argv;
640 argv[argc] = submodule_prefix.buf;
641 if (run_command(&cp))
642 result = 1;
644 strbuf_release(&submodule_path);
645 strbuf_release(&submodule_git_dir);
646 strbuf_release(&submodule_prefix);
648 free(argv);
649 out:
650 string_list_clear(&changed_submodule_paths, 1);
651 return result;
654 unsigned is_submodule_modified(const char *path, int ignore_untracked)
656 ssize_t len;
657 struct child_process cp;
658 const char *argv[] = {
659 "status",
660 "--porcelain",
661 NULL,
662 NULL,
664 struct strbuf buf = STRBUF_INIT;
665 unsigned dirty_submodule = 0;
666 const char *line, *next_line;
667 const char *git_dir;
669 strbuf_addf(&buf, "%s/.git", path);
670 git_dir = read_gitfile(buf.buf);
671 if (!git_dir)
672 git_dir = buf.buf;
673 if (!is_directory(git_dir)) {
674 strbuf_release(&buf);
675 /* The submodule is not checked out, so it is not modified */
676 return 0;
679 strbuf_reset(&buf);
681 if (ignore_untracked)
682 argv[2] = "-uno";
684 memset(&cp, 0, sizeof(cp));
685 cp.argv = argv;
686 cp.env = local_repo_env;
687 cp.git_cmd = 1;
688 cp.no_stdin = 1;
689 cp.out = -1;
690 cp.dir = path;
691 if (start_command(&cp))
692 die("Could not run git status --porcelain");
694 len = strbuf_read(&buf, cp.out, 1024);
695 line = buf.buf;
696 while (len > 2) {
697 if ((line[0] == '?') && (line[1] == '?')) {
698 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
699 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
700 break;
701 } else {
702 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
703 if (ignore_untracked ||
704 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
705 break;
707 next_line = strchr(line, '\n');
708 if (!next_line)
709 break;
710 next_line++;
711 len -= (next_line - line);
712 line = next_line;
714 close(cp.out);
716 if (finish_command(&cp))
717 die("git status --porcelain failed");
719 strbuf_release(&buf);
720 return dirty_submodule;
723 static int find_first_merges(struct object_array *result, const char *path,
724 struct commit *a, struct commit *b)
726 int i, j;
727 struct object_array merges;
728 struct commit *commit;
729 int contains_another;
731 char merged_revision[42];
732 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
733 "--all", merged_revision, NULL };
734 struct rev_info revs;
735 struct setup_revision_opt rev_opts;
737 memset(&merges, 0, sizeof(merges));
738 memset(result, 0, sizeof(struct object_array));
739 memset(&rev_opts, 0, sizeof(rev_opts));
741 /* get all revisions that merge commit a */
742 snprintf(merged_revision, sizeof(merged_revision), "^%s",
743 sha1_to_hex(a->object.sha1));
744 init_revisions(&revs, NULL);
745 rev_opts.submodule = path;
746 setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
748 /* save all revisions from the above list that contain b */
749 if (prepare_revision_walk(&revs))
750 die("revision walk setup failed");
751 while ((commit = get_revision(&revs)) != NULL) {
752 struct object *o = &(commit->object);
753 if (in_merge_bases(b, &commit, 1))
754 add_object_array(o, NULL, &merges);
757 /* Now we've got all merges that contain a and b. Prune all
758 * merges that contain another found merge and save them in
759 * result.
761 for (i = 0; i < merges.nr; i++) {
762 struct commit *m1 = (struct commit *) merges.objects[i].item;
764 contains_another = 0;
765 for (j = 0; j < merges.nr; j++) {
766 struct commit *m2 = (struct commit *) merges.objects[j].item;
767 if (i != j && in_merge_bases(m2, &m1, 1)) {
768 contains_another = 1;
769 break;
773 if (!contains_another)
774 add_object_array(merges.objects[i].item,
775 merges.objects[i].name, result);
778 free(merges.objects);
779 return result->nr;
782 static void print_commit(struct commit *commit)
784 struct strbuf sb = STRBUF_INIT;
785 struct pretty_print_context ctx = {0};
786 ctx.date_mode = DATE_NORMAL;
787 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
788 fprintf(stderr, "%s\n", sb.buf);
789 strbuf_release(&sb);
792 #define MERGE_WARNING(path, msg) \
793 warning("Failed to merge submodule %s (%s)", path, msg);
795 int merge_submodule(unsigned char result[20], const char *path,
796 const unsigned char base[20], const unsigned char a[20],
797 const unsigned char b[20])
799 struct commit *commit_base, *commit_a, *commit_b;
800 int parent_count;
801 struct object_array merges;
803 int i;
805 /* store a in result in case we fail */
806 hashcpy(result, a);
808 /* we can not handle deletion conflicts */
809 if (is_null_sha1(base))
810 return 0;
811 if (is_null_sha1(a))
812 return 0;
813 if (is_null_sha1(b))
814 return 0;
816 if (add_submodule_odb(path)) {
817 MERGE_WARNING(path, "not checked out");
818 return 0;
821 if (!(commit_base = lookup_commit_reference(base)) ||
822 !(commit_a = lookup_commit_reference(a)) ||
823 !(commit_b = lookup_commit_reference(b))) {
824 MERGE_WARNING(path, "commits not present");
825 return 0;
828 /* check whether both changes are forward */
829 if (!in_merge_bases(commit_base, &commit_a, 1) ||
830 !in_merge_bases(commit_base, &commit_b, 1)) {
831 MERGE_WARNING(path, "commits don't follow merge-base");
832 return 0;
835 /* Case #1: a is contained in b or vice versa */
836 if (in_merge_bases(commit_a, &commit_b, 1)) {
837 hashcpy(result, b);
838 return 1;
840 if (in_merge_bases(commit_b, &commit_a, 1)) {
841 hashcpy(result, a);
842 return 1;
846 * Case #2: There are one or more merges that contain a and b in
847 * the submodule. If there is only one, then present it as a
848 * suggestion to the user, but leave it marked unmerged so the
849 * user needs to confirm the resolution.
852 /* find commit which merges them */
853 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
854 switch (parent_count) {
855 case 0:
856 MERGE_WARNING(path, "merge following commits not found");
857 break;
859 case 1:
860 MERGE_WARNING(path, "not fast-forward");
861 fprintf(stderr, "Found a possible merge resolution "
862 "for the submodule:\n");
863 print_commit((struct commit *) merges.objects[0].item);
864 fprintf(stderr,
865 "If this is correct simply add it to the index "
866 "for example\n"
867 "by using:\n\n"
868 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
869 "which will accept this suggestion.\n",
870 sha1_to_hex(merges.objects[0].item->sha1), path);
871 break;
873 default:
874 MERGE_WARNING(path, "multiple merges found");
875 for (i = 0; i < merges.nr; i++)
876 print_commit((struct commit *) merges.objects[i].item);
879 free(merges.objects);
880 return 0;