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"
11static struct string_list config_name_for_path;
13static struct string_list config_fetch_recurse_submodules_for_name;
14static struct string_list config_ignore_for_name;
15static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
16static struct string_list changed_submodule_paths;
17/*
18 * The following flag is set if the .gitmodules file is unmerged. We then
19 * disable recursion for all submodules where .git/config doesn't have a
20 * matching config entry because we can't guess what might be configured in
21 * .gitmodules unless the user resolves the conflict. When a command line
22 * option is given (which always overrides configuration) this flag will be
23 * ignored.
24 */
25static int gitmodules_is_unmerged;
26static int add_submodule_odb(const char *path)
28{
29 struct strbuf objects_directory = STRBUF_INIT;
30 struct alternate_object_database *alt_odb;
31 int ret = 0;
32 const char *git_dir;
33 strbuf_addf(&objects_directory, "%s/.git", path);
35 git_dir = read_gitfile(objects_directory.buf);
36 if (git_dir) {
37 strbuf_reset(&objects_directory);
38 strbuf_addstr(&objects_directory, git_dir);
39 }
40 strbuf_addstr(&objects_directory, "/objects/");
41 if (!is_directory(objects_directory.buf)) {
42 ret = -1;
43 goto done;
44 }
45 /* avoid adding it twice */
46 for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
47 if (alt_odb->name - alt_odb->base == objects_directory.len &&
48 !strncmp(alt_odb->base, objects_directory.buf,
49 objects_directory.len))
50 goto done;
51 alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
53 alt_odb->next = alt_odb_list;
54 strcpy(alt_odb->base, objects_directory.buf);
55 alt_odb->name = alt_odb->base + objects_directory.len;
56 alt_odb->name[2] = '/';
57 alt_odb->name[40] = '\0';
58 alt_odb->name[41] = '\0';
59 alt_odb_list = alt_odb;
60 prepare_alt_odb();
61done:
62 strbuf_release(&objects_directory);
63 return ret;
64}
65void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
67 const char *path)
68{
69 struct string_list_item *path_option, *ignore_option;
70 path_option = unsorted_string_list_lookup(&config_name_for_path, path);
71 if (path_option) {
72 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
73 if (ignore_option)
74 handle_ignore_submodules_arg(diffopt, ignore_option->util);
75 else if (gitmodules_is_unmerged)
76 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
77 }
78}
79int submodule_config(const char *var, const char *value, void *cb)
81{
82 if (!prefixcmp(var, "submodule."))
83 return parse_submodule_config_option(var, value);
84 else if (!strcmp(var, "fetch.recursesubmodules")) {
85 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
86 return 0;
87 }
88 return 0;
89}
90void gitmodules_config(void)
92{
93 const char *work_tree = get_git_work_tree();
94 if (work_tree) {
95 struct strbuf gitmodules_path = STRBUF_INIT;
96 int pos;
97 strbuf_addstr(&gitmodules_path, work_tree);
98 strbuf_addstr(&gitmodules_path, "/.gitmodules");
99 if (read_cache() < 0)
100 die("index file corrupt");
101 pos = cache_name_pos(".gitmodules", 11);
102 if (pos < 0) { /* .gitmodules not found or isn't merged */
103 pos = -1 - pos;
104 if (active_nr > pos) { /* there is a .gitmodules */
105 const struct cache_entry *ce = active_cache[pos];
106 if (ce_namelen(ce) == 11 &&
107 !memcmp(ce->name, ".gitmodules", 11))
108 gitmodules_is_unmerged = 1;
109 }
110 }
111 if (!gitmodules_is_unmerged)
113 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
114 strbuf_release(&gitmodules_path);
115 }
116}
117int parse_submodule_config_option(const char *var, const char *value)
119{
120 int len;
121 struct string_list_item *config;
122 struct strbuf submodname = STRBUF_INIT;
123 var += 10; /* Skip "submodule." */
125 len = strlen(var);
127 if ((len > 5) && !strcmp(var + len - 5, ".path")) {
128 strbuf_add(&submodname, var, len - 5);
129 config = unsorted_string_list_lookup(&config_name_for_path, value);
130 if (config)
131 free(config->util);
132 else
133 config = string_list_append(&config_name_for_path, xstrdup(value));
134 config->util = strbuf_detach(&submodname, NULL);
135 strbuf_release(&submodname);
136 } else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
137 strbuf_add(&submodname, var, len - 23);
138 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
139 if (!config)
140 config = string_list_append(&config_fetch_recurse_submodules_for_name,
141 strbuf_detach(&submodname, NULL));
142 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
143 strbuf_release(&submodname);
144 } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
145 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
146 strcmp(value, "all") && strcmp(value, "none")) {
147 warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
148 return 0;
149 }
150 strbuf_add(&submodname, var, len - 7);
152 config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
153 if (config)
154 free(config->util);
155 else
156 config = string_list_append(&config_ignore_for_name,
157 strbuf_detach(&submodname, NULL));
158 strbuf_release(&submodname);
159 config->util = xstrdup(value);
160 return 0;
161 }
162 return 0;
163}
164void handle_ignore_submodules_arg(struct diff_options *diffopt,
166 const char *arg)
167{
168 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
169 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
170 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
171 if (!strcmp(arg, "all"))
173 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
174 else if (!strcmp(arg, "untracked"))
175 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
176 else if (!strcmp(arg, "dirty"))
177 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
178 else if (strcmp(arg, "none"))
179 die("bad --ignore-submodules argument: %s", arg);
180}
181static int prepare_submodule_summary(struct rev_info *rev, const char *path,
183 struct commit *left, struct commit *right,
184 int *fast_forward, int *fast_backward)
185{
186 struct commit_list *merge_bases, *list;
187 init_revisions(rev, NULL);
189 setup_revisions(0, NULL, rev, NULL);
190 rev->left_right = 1;
191 rev->first_parent_only = 1;
192 left->object.flags |= SYMMETRIC_LEFT;
193 add_pending_object(rev, &left->object, path);
194 add_pending_object(rev, &right->object, path);
195 merge_bases = get_merge_bases(left, right, 1);
196 if (merge_bases) {
197 if (merge_bases->item == left)
198 *fast_forward = 1;
199 else if (merge_bases->item == right)
200 *fast_backward = 1;
201 }
202 for (list = merge_bases; list; list = list->next) {
203 list->item->object.flags |= UNINTERESTING;
204 add_pending_object(rev, &list->item->object,
205 sha1_to_hex(list->item->object.sha1));
206 }
207 return prepare_revision_walk(rev);
208}
209static void print_submodule_summary(struct rev_info *rev, FILE *f,
211 const char *del, const char *add, const char *reset)
212{
213 static const char format[] = " %m %s";
214 struct strbuf sb = STRBUF_INIT;
215 struct commit *commit;
216 while ((commit = get_revision(rev))) {
218 struct pretty_print_context ctx = {0};
219 ctx.date_mode = rev->date_mode;
220 strbuf_setlen(&sb, 0);
221 if (commit->object.flags & SYMMETRIC_LEFT) {
222 if (del)
223 strbuf_addstr(&sb, del);
224 }
225 else if (add)
226 strbuf_addstr(&sb, add);
227 format_commit_message(commit, format, &sb, &ctx);
228 if (reset)
229 strbuf_addstr(&sb, reset);
230 strbuf_addch(&sb, '\n');
231 fprintf(f, "%s", sb.buf);
232 }
233 strbuf_release(&sb);
234}
235int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
237{
238 switch (git_config_maybe_bool(opt, arg)) {
239 case 1:
240 return RECURSE_SUBMODULES_ON;
241 case 0:
242 return RECURSE_SUBMODULES_OFF;
243 default:
244 if (!strcmp(arg, "on-demand"))
245 return RECURSE_SUBMODULES_ON_DEMAND;
246 die("bad %s argument: %s", opt, arg);
247 }
248}
249void show_submodule_summary(FILE *f, const char *path,
251 unsigned char one[20], unsigned char two[20],
252 unsigned dirty_submodule,
253 const char *del, const char *add, const char *reset)
254{
255 struct rev_info rev;
256 struct commit *left = left, *right = right;
257 const char *message = NULL;
258 struct strbuf sb = STRBUF_INIT;
259 int fast_forward = 0, fast_backward = 0;
260 if (is_null_sha1(two))
262 message = "(submodule deleted)";
263 else if (add_submodule_odb(path))
264 message = "(not checked out)";
265 else if (is_null_sha1(one))
266 message = "(new submodule)";
267 else if (!(left = lookup_commit_reference(one)) ||
268 !(right = lookup_commit_reference(two)))
269 message = "(commits not present)";
270 if (!message &&
272 prepare_submodule_summary(&rev, path, left, right,
273 &fast_forward, &fast_backward))
274 message = "(revision walker failed)";
275 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
277 fprintf(f, "Submodule %s contains untracked content\n", path);
278 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
279 fprintf(f, "Submodule %s contains modified content\n", path);
280 if (!hashcmp(one, two)) {
282 strbuf_release(&sb);
283 return;
284 }
285 strbuf_addf(&sb, "Submodule %s %s..", path,
287 find_unique_abbrev(one, DEFAULT_ABBREV));
288 if (!fast_backward && !fast_forward)
289 strbuf_addch(&sb, '.');
290 strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
291 if (message)
292 strbuf_addf(&sb, " %s\n", message);
293 else
294 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
295 fwrite(sb.buf, sb.len, 1, f);
296 if (!message) {
298 print_submodule_summary(&rev, f, del, add, reset);
299 clear_commit_marks(left, ~0);
300 clear_commit_marks(right, ~0);
301 }
302 strbuf_release(&sb);
304}
305void set_config_fetch_recurse_submodules(int value)
307{
308 config_fetch_recurse_submodules = value;
309}
310static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
312{
313 return 1;
314}
315static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
317{
318 if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
319 return 0;
320 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
322 struct child_process cp;
323 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
324 struct strbuf buf = STRBUF_INIT;
325 int needs_pushing = 0;
326 argv[1] = 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 (start_command(&cp))
336 die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
337 sha1_to_hex(sha1), path);
338 if (strbuf_read(&buf, cp.out, 41))
339 needs_pushing = 1;
340 finish_command(&cp);
341 close(cp.out);
342 strbuf_release(&buf);
343 return needs_pushing;
344 }
345 return 0;
347}
348static void collect_submodules_from_diff(struct diff_queue_struct *q,
350 struct diff_options *options,
351 void *data)
352{
353 int i;
354 int *needs_pushing = data;
355 for (i = 0; i < q->nr; i++) {
357 struct diff_filepair *p = q->queue[i];
358 if (!S_ISGITLINK(p->two->mode))
359 continue;
360 if (submodule_needs_pushing(p->two->path, p->two->sha1)) {
361 *needs_pushing = 1;
362 break;
363 }
364 }
365}
366static void commit_need_pushing(struct commit *commit, struct commit_list *parent, int *needs_pushing)
369{
370 const unsigned char (*parents)[20];
371 unsigned int i, n;
372 struct rev_info rev;
373 n = commit_list_count(parent);
375 parents = xmalloc(n * sizeof(*parents));
376 for (i = 0; i < n; i++) {
378 hashcpy((unsigned char *)(parents + i), parent->item->object.sha1);
379 parent = parent->next;
380 }
381 init_revisions(&rev, NULL);
383 rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
384 rev.diffopt.format_callback = collect_submodules_from_diff;
385 rev.diffopt.format_callback_data = needs_pushing;
386 diff_tree_combined(commit->object.sha1, parents, n, 1, &rev);
387 free(parents);
389}
390int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remotes_name)
392{
393 struct rev_info rev;
394 struct commit *commit;
395 const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
396 int argc = ARRAY_SIZE(argv) - 1;
397 char *sha1_copy;
398 int needs_pushing = 0;
399 struct strbuf remotes_arg = STRBUF_INIT;
400 strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
402 init_revisions(&rev, NULL);
403 sha1_copy = xstrdup(sha1_to_hex(new_sha1));
404 argv[1] = sha1_copy;
405 argv[3] = remotes_arg.buf;
406 setup_revisions(argc, argv, &rev, NULL);
407 if (prepare_revision_walk(&rev))
408 die("revision walk setup failed");
409 while ((commit = get_revision(&rev)) && !needs_pushing)
411 commit_need_pushing(commit, commit->parents, &needs_pushing);
412 free(sha1_copy);
414 strbuf_release(&remotes_arg);
415 return needs_pushing;
417}
418static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
420{
421 int is_present = 0;
422 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
423 /* Even if the submodule is checked out and the commit is
424 * present, make sure it is reachable from a ref. */
425 struct child_process cp;
426 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
427 struct strbuf buf = STRBUF_INIT;
428 argv[3] = sha1_to_hex(sha1);
430 memset(&cp, 0, sizeof(cp));
431 cp.argv = argv;
432 cp.env = local_repo_env;
433 cp.git_cmd = 1;
434 cp.no_stdin = 1;
435 cp.out = -1;
436 cp.dir = path;
437 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
438 is_present = 1;
439 close(cp.out);
441 strbuf_release(&buf);
442 }
443 return is_present;
444}
445static void submodule_collect_changed_cb(struct diff_queue_struct *q,
447 struct diff_options *options,
448 void *data)
449{
450 int i;
451 for (i = 0; i < q->nr; i++) {
452 struct diff_filepair *p = q->queue[i];
453 if (!S_ISGITLINK(p->two->mode))
454 continue;
455 if (S_ISGITLINK(p->one->mode)) {
457 /* NEEDSWORK: We should honor the name configured in
458 * the .gitmodules file of the commit we are examining
459 * here to be able to correctly follow submodules
460 * being moved around. */
461 struct string_list_item *path;
462 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
463 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
464 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
465 } else {
466 /* Submodule is new or was moved here */
467 /* NEEDSWORK: When the .git directories of submodules
468 * live inside the superprojects .git directory some
469 * day we should fetch new submodules directly into
470 * that location too when config or options request
471 * that so they can be checked out from there. */
472 continue;
473 }
474 }
475}
476void check_for_new_submodule_commits(unsigned char new_sha1[20])
478{
479 struct rev_info rev;
480 struct commit *commit;
481 const char *argv[] = {NULL, NULL, "--not", "--all", NULL};
482 int argc = ARRAY_SIZE(argv) - 1;
483 /* No need to check if there are no submodules configured */
485 if (!config_name_for_path.nr)
486 return;
487 init_revisions(&rev, NULL);
489 argv[1] = xstrdup(sha1_to_hex(new_sha1));
490 setup_revisions(argc, argv, &rev, NULL);
491 if (prepare_revision_walk(&rev))
492 die("revision walk setup failed");
493 /*
495 * Collect all submodules (whether checked out or not) for which new
496 * commits have been recorded upstream in "changed_submodule_paths".
497 */
498 while ((commit = get_revision(&rev))) {
499 struct commit_list *parent = commit->parents;
500 while (parent) {
501 struct diff_options diff_opts;
502 diff_setup(&diff_opts);
503 DIFF_OPT_SET(&diff_opts, RECURSIVE);
504 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
505 diff_opts.format_callback = submodule_collect_changed_cb;
506 if (diff_setup_done(&diff_opts) < 0)
507 die("diff_setup_done failed");
508 diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
509 diffcore_std(&diff_opts);
510 diff_flush(&diff_opts);
511 parent = parent->next;
512 }
513 }
514 free((char *)argv[1]);
515}
516int fetch_populated_submodules(int num_options, const char **options,
518 const char *prefix, int command_line_option,
519 int quiet)
520{
521 int i, result = 0, argc = 0, default_argc;
522 struct child_process cp;
523 const char **argv;
524 struct string_list_item *name_for_path;
525 const char *work_tree = get_git_work_tree();
526 if (!work_tree)
527 goto out;
528 if (!the_index.initialized)
530 if (read_cache() < 0)
531 die("index file corrupt");
532 /* 6: "fetch" (options) --recurse-submodules-default default "--submodule-prefix" prefix NULL */
534 argv = xcalloc(num_options + 6, sizeof(const char *));
535 argv[argc++] = "fetch";
536 for (i = 0; i < num_options; i++)
537 argv[argc++] = options[i];
538 argv[argc++] = "--recurse-submodules-default";
539 default_argc = argc++;
540 argv[argc++] = "--submodule-prefix";
541 memset(&cp, 0, sizeof(cp));
543 cp.argv = argv;
544 cp.env = local_repo_env;
545 cp.git_cmd = 1;
546 cp.no_stdin = 1;
547 for (i = 0; i < active_nr; i++) {
549 struct strbuf submodule_path = STRBUF_INIT;
550 struct strbuf submodule_git_dir = STRBUF_INIT;
551 struct strbuf submodule_prefix = STRBUF_INIT;
552 struct cache_entry *ce = active_cache[i];
553 const char *git_dir, *name, *default_argv;
554 if (!S_ISGITLINK(ce->ce_mode))
556 continue;
557 name = ce->name;
559 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
560 if (name_for_path)
561 name = name_for_path->util;
562 default_argv = "yes";
564 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
565 struct string_list_item *fetch_recurse_submodules_option;
566 fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
567 if (fetch_recurse_submodules_option) {
568 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
569 continue;
570 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
571 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
572 continue;
573 default_argv = "on-demand";
574 }
575 } else {
576 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
577 gitmodules_is_unmerged)
578 continue;
579 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
580 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
581 continue;
582 default_argv = "on-demand";
583 }
584 }
585 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
586 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
587 continue;
588 default_argv = "on-demand";
589 }
590 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
592 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
593 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
594 git_dir = read_gitfile(submodule_git_dir.buf);
595 if (!git_dir)
596 git_dir = submodule_git_dir.buf;
597 if (is_directory(git_dir)) {
598 if (!quiet)
599 printf("Fetching submodule %s%s\n", prefix, ce->name);
600 cp.dir = submodule_path.buf;
601 argv[default_argc] = default_argv;
602 argv[argc] = submodule_prefix.buf;
603 if (run_command(&cp))
604 result = 1;
605 }
606 strbuf_release(&submodule_path);
607 strbuf_release(&submodule_git_dir);
608 strbuf_release(&submodule_prefix);
609 }
610 free(argv);
611out:
612 string_list_clear(&changed_submodule_paths, 1);
613 return result;
614}
615unsigned is_submodule_modified(const char *path, int ignore_untracked)
617{
618 ssize_t len;
619 struct child_process cp;
620 const char *argv[] = {
621 "status",
622 "--porcelain",
623 NULL,
624 NULL,
625 };
626 struct strbuf buf = STRBUF_INIT;
627 unsigned dirty_submodule = 0;
628 const char *line, *next_line;
629 const char *git_dir;
630 strbuf_addf(&buf, "%s/.git", path);
632 git_dir = read_gitfile(buf.buf);
633 if (!git_dir)
634 git_dir = buf.buf;
635 if (!is_directory(git_dir)) {
636 strbuf_release(&buf);
637 /* The submodule is not checked out, so it is not modified */
638 return 0;
639 }
641 strbuf_reset(&buf);
642 if (ignore_untracked)
644 argv[2] = "-uno";
645 memset(&cp, 0, sizeof(cp));
647 cp.argv = argv;
648 cp.env = local_repo_env;
649 cp.git_cmd = 1;
650 cp.no_stdin = 1;
651 cp.out = -1;
652 cp.dir = path;
653 if (start_command(&cp))
654 die("Could not run git status --porcelain");
655 len = strbuf_read(&buf, cp.out, 1024);
657 line = buf.buf;
658 while (len > 2) {
659 if ((line[0] == '?') && (line[1] == '?')) {
660 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
661 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
662 break;
663 } else {
664 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
665 if (ignore_untracked ||
666 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
667 break;
668 }
669 next_line = strchr(line, '\n');
670 if (!next_line)
671 break;
672 next_line++;
673 len -= (next_line - line);
674 line = next_line;
675 }
676 close(cp.out);
677 if (finish_command(&cp))
679 die("git status --porcelain failed");
680 strbuf_release(&buf);
682 return dirty_submodule;
683}
684static int find_first_merges(struct object_array *result, const char *path,
686 struct commit *a, struct commit *b)
687{
688 int i, j;
689 struct object_array merges;
690 struct commit *commit;
691 int contains_another;
692 char merged_revision[42];
694 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
695 "--all", merged_revision, NULL };
696 struct rev_info revs;
697 struct setup_revision_opt rev_opts;
698 memset(&merges, 0, sizeof(merges));
700 memset(result, 0, sizeof(struct object_array));
701 memset(&rev_opts, 0, sizeof(rev_opts));
702 /* get all revisions that merge commit a */
704 snprintf(merged_revision, sizeof(merged_revision), "^%s",
705 sha1_to_hex(a->object.sha1));
706 init_revisions(&revs, NULL);
707 rev_opts.submodule = path;
708 setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
709 /* save all revisions from the above list that contain b */
711 if (prepare_revision_walk(&revs))
712 die("revision walk setup failed");
713 while ((commit = get_revision(&revs)) != NULL) {
714 struct object *o = &(commit->object);
715 if (in_merge_bases(b, &commit, 1))
716 add_object_array(o, NULL, &merges);
717 }
718 /* Now we've got all merges that contain a and b. Prune all
720 * merges that contain another found merge and save them in
721 * result.
722 */
723 for (i = 0; i < merges.nr; i++) {
724 struct commit *m1 = (struct commit *) merges.objects[i].item;
725 contains_another = 0;
727 for (j = 0; j < merges.nr; j++) {
728 struct commit *m2 = (struct commit *) merges.objects[j].item;
729 if (i != j && in_merge_bases(m2, &m1, 1)) {
730 contains_another = 1;
731 break;
732 }
733 }
734 if (!contains_another)
736 add_object_array(merges.objects[i].item,
737 merges.objects[i].name, result);
738 }
739 free(merges.objects);
741 return result->nr;
742}
743static void print_commit(struct commit *commit)
745{
746 struct strbuf sb = STRBUF_INIT;
747 struct pretty_print_context ctx = {0};
748 ctx.date_mode = DATE_NORMAL;
749 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
750 fprintf(stderr, "%s\n", sb.buf);
751 strbuf_release(&sb);
752}
753#define MERGE_WARNING(path, msg) \
755 warning("Failed to merge submodule %s (%s)", path, msg);
756int merge_submodule(unsigned char result[20], const char *path,
758 const unsigned char base[20], const unsigned char a[20],
759 const unsigned char b[20])
760{
761 struct commit *commit_base, *commit_a, *commit_b;
762 int parent_count;
763 struct object_array merges;
764 int i;
766 /* store a in result in case we fail */
768 hashcpy(result, a);
769 /* we can not handle deletion conflicts */
771 if (is_null_sha1(base))
772 return 0;
773 if (is_null_sha1(a))
774 return 0;
775 if (is_null_sha1(b))
776 return 0;
777 if (add_submodule_odb(path)) {
779 MERGE_WARNING(path, "not checked out");
780 return 0;
781 }
782 if (!(commit_base = lookup_commit_reference(base)) ||
784 !(commit_a = lookup_commit_reference(a)) ||
785 !(commit_b = lookup_commit_reference(b))) {
786 MERGE_WARNING(path, "commits not present");
787 return 0;
788 }
789 /* check whether both changes are forward */
791 if (!in_merge_bases(commit_base, &commit_a, 1) ||
792 !in_merge_bases(commit_base, &commit_b, 1)) {
793 MERGE_WARNING(path, "commits don't follow merge-base");
794 return 0;
795 }
796 /* Case #1: a is contained in b or vice versa */
798 if (in_merge_bases(commit_a, &commit_b, 1)) {
799 hashcpy(result, b);
800 return 1;
801 }
802 if (in_merge_bases(commit_b, &commit_a, 1)) {
803 hashcpy(result, a);
804 return 1;
805 }
806 /*
808 * Case #2: There are one or more merges that contain a and b in
809 * the submodule. If there is only one, then present it as a
810 * suggestion to the user, but leave it marked unmerged so the
811 * user needs to confirm the resolution.
812 */
813 /* find commit which merges them */
815 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
816 switch (parent_count) {
817 case 0:
818 MERGE_WARNING(path, "merge following commits not found");
819 break;
820 case 1:
822 MERGE_WARNING(path, "not fast-forward");
823 fprintf(stderr, "Found a possible merge resolution "
824 "for the submodule:\n");
825 print_commit((struct commit *) merges.objects[0].item);
826 fprintf(stderr,
827 "If this is correct simply add it to the index "
828 "for example\n"
829 "by using:\n\n"
830 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
831 "which will accept this suggestion.\n",
832 sha1_to_hex(merges.objects[0].item->sha1), path);
833 break;
834 default:
836 MERGE_WARNING(path, "multiple merges found");
837 for (i = 0; i < merges.nr; i++)
838 print_commit((struct commit *) merges.objects[i].item);
839 }
840 free(merges.objects);
842 return 0;
843}