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"
13static struct string_list config_name_for_path;
15static struct string_list config_fetch_recurse_submodules_for_name;
16static struct string_list config_ignore_for_name;
17static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
18static struct string_list changed_submodule_paths;
19static int initialized_fetch_ref_tips;
20static struct sha1_array ref_tips_before_fetch;
21static struct sha1_array ref_tips_after_fetch;
22/*
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 */
31static int gitmodules_is_unmerged;
32static 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 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);
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 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 /* add possible alternates from the submodule */
68 read_info_alternates(objects_directory.buf, 0);
69 prepare_alt_odb();
70done:
71 strbuf_release(&objects_directory);
72 return ret;
73}
74void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
76 const char *path)
77{
78 struct string_list_item *path_option, *ignore_option;
79 path_option = unsorted_string_list_lookup(&config_name_for_path, path);
80 if (path_option) {
81 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
82 if (ignore_option)
83 handle_ignore_submodules_arg(diffopt, ignore_option->util);
84 else if (gitmodules_is_unmerged)
85 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
86 }
87}
88int submodule_config(const char *var, const char *value, void *cb)
90{
91 if (!prefixcmp(var, "submodule."))
92 return parse_submodule_config_option(var, value);
93 else if (!strcmp(var, "fetch.recursesubmodules")) {
94 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
95 return 0;
96 }
97 return 0;
98}
99void gitmodules_config(void)
101{
102 const char *work_tree = get_git_work_tree();
103 if (work_tree) {
104 struct strbuf gitmodules_path = STRBUF_INIT;
105 int pos;
106 strbuf_addstr(&gitmodules_path, work_tree);
107 strbuf_addstr(&gitmodules_path, "/.gitmodules");
108 if (read_cache() < 0)
109 die("index file corrupt");
110 pos = cache_name_pos(".gitmodules", 11);
111 if (pos < 0) { /* .gitmodules not found or isn't merged */
112 pos = -1 - pos;
113 if (active_nr > pos) { /* there is a .gitmodules */
114 const struct cache_entry *ce = active_cache[pos];
115 if (ce_namelen(ce) == 11 &&
116 !memcmp(ce->name, ".gitmodules", 11))
117 gitmodules_is_unmerged = 1;
118 }
119 }
120 if (!gitmodules_is_unmerged)
122 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
123 strbuf_release(&gitmodules_path);
124 }
125}
126int parse_submodule_config_option(const char *var, const char *value)
128{
129 int len;
130 struct string_list_item *config;
131 struct strbuf submodname = STRBUF_INIT;
132 var += 10; /* Skip "submodule." */
134 len = strlen(var);
136 if ((len > 5) && !strcmp(var + len - 5, ".path")) {
137 strbuf_add(&submodname, var, len - 5);
138 config = unsorted_string_list_lookup(&config_name_for_path, value);
139 if (config)
140 free(config->util);
141 else
142 config = string_list_append(&config_name_for_path, xstrdup(value));
143 config->util = strbuf_detach(&submodname, NULL);
144 strbuf_release(&submodname);
145 } else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
146 strbuf_add(&submodname, var, len - 23);
147 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
148 if (!config)
149 config = string_list_append(&config_fetch_recurse_submodules_for_name,
150 strbuf_detach(&submodname, NULL));
151 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
152 strbuf_release(&submodname);
153 } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
154 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
155 strcmp(value, "all") && strcmp(value, "none")) {
156 warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
157 return 0;
158 }
159 strbuf_add(&submodname, var, len - 7);
161 config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
162 if (config)
163 free(config->util);
164 else
165 config = string_list_append(&config_ignore_for_name,
166 strbuf_detach(&submodname, NULL));
167 strbuf_release(&submodname);
168 config->util = xstrdup(value);
169 return 0;
170 }
171 return 0;
172}
173void handle_ignore_submodules_arg(struct diff_options *diffopt,
175 const char *arg)
176{
177 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
178 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
179 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
180 if (!strcmp(arg, "all"))
182 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
183 else if (!strcmp(arg, "untracked"))
184 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
185 else if (!strcmp(arg, "dirty"))
186 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
187 else if (strcmp(arg, "none"))
188 die("bad --ignore-submodules argument: %s", arg);
189}
190static int prepare_submodule_summary(struct rev_info *rev, const char *path,
192 struct commit *left, struct commit *right,
193 int *fast_forward, int *fast_backward)
194{
195 struct commit_list *merge_bases, *list;
196 init_revisions(rev, NULL);
198 setup_revisions(0, NULL, rev, NULL);
199 rev->left_right = 1;
200 rev->first_parent_only = 1;
201 left->object.flags |= SYMMETRIC_LEFT;
202 add_pending_object(rev, &left->object, path);
203 add_pending_object(rev, &right->object, path);
204 merge_bases = get_merge_bases(left, right, 1);
205 if (merge_bases) {
206 if (merge_bases->item == left)
207 *fast_forward = 1;
208 else if (merge_bases->item == right)
209 *fast_backward = 1;
210 }
211 for (list = merge_bases; list; list = list->next) {
212 list->item->object.flags |= UNINTERESTING;
213 add_pending_object(rev, &list->item->object,
214 sha1_to_hex(list->item->object.sha1));
215 }
216 return prepare_revision_walk(rev);
217}
218static void print_submodule_summary(struct rev_info *rev, FILE *f,
220 const char *del, const char *add, const char *reset)
221{
222 static const char format[] = " %m %s";
223 struct strbuf sb = STRBUF_INIT;
224 struct commit *commit;
225 while ((commit = get_revision(rev))) {
227 struct pretty_print_context ctx = {0};
228 ctx.date_mode = rev->date_mode;
229 strbuf_setlen(&sb, 0);
230 if (commit->object.flags & SYMMETRIC_LEFT) {
231 if (del)
232 strbuf_addstr(&sb, del);
233 }
234 else if (add)
235 strbuf_addstr(&sb, add);
236 format_commit_message(commit, format, &sb, &ctx);
237 if (reset)
238 strbuf_addstr(&sb, reset);
239 strbuf_addch(&sb, '\n');
240 fprintf(f, "%s", sb.buf);
241 }
242 strbuf_release(&sb);
243}
244int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
246{
247 switch (git_config_maybe_bool(opt, arg)) {
248 case 1:
249 return RECURSE_SUBMODULES_ON;
250 case 0:
251 return RECURSE_SUBMODULES_OFF;
252 default:
253 if (!strcmp(arg, "on-demand"))
254 return RECURSE_SUBMODULES_ON_DEMAND;
255 die("bad %s argument: %s", opt, arg);
256 }
257}
258void show_submodule_summary(FILE *f, const char *path,
260 unsigned char one[20], unsigned char two[20],
261 unsigned dirty_submodule,
262 const char *del, const char *add, const char *reset)
263{
264 struct rev_info rev;
265 struct commit *left = left, *right = right;
266 const char *message = NULL;
267 struct strbuf sb = STRBUF_INIT;
268 int fast_forward = 0, fast_backward = 0;
269 if (is_null_sha1(two))
271 message = "(submodule deleted)";
272 else if (add_submodule_odb(path))
273 message = "(not checked out)";
274 else if (is_null_sha1(one))
275 message = "(new submodule)";
276 else if (!(left = lookup_commit_reference(one)) ||
277 !(right = lookup_commit_reference(two)))
278 message = "(commits not present)";
279 if (!message &&
281 prepare_submodule_summary(&rev, path, left, right,
282 &fast_forward, &fast_backward))
283 message = "(revision walker failed)";
284 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
286 fprintf(f, "Submodule %s contains untracked content\n", path);
287 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
288 fprintf(f, "Submodule %s contains modified content\n", path);
289 if (!hashcmp(one, two)) {
291 strbuf_release(&sb);
292 return;
293 }
294 strbuf_addf(&sb, "Submodule %s %s..", path,
296 find_unique_abbrev(one, DEFAULT_ABBREV));
297 if (!fast_backward && !fast_forward)
298 strbuf_addch(&sb, '.');
299 strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
300 if (message)
301 strbuf_addf(&sb, " %s\n", message);
302 else
303 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
304 fwrite(sb.buf, sb.len, 1, f);
305 if (!message) {
307 print_submodule_summary(&rev, f, del, add, reset);
308 clear_commit_marks(left, ~0);
309 clear_commit_marks(right, ~0);
310 }
311 strbuf_release(&sb);
313}
314void set_config_fetch_recurse_submodules(int value)
316{
317 config_fetch_recurse_submodules = value;
318}
319static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
321{
322 return 1;
323}
324static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
326{
327 if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
328 return 0;
329 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
331 struct child_process cp;
332 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
333 struct strbuf buf = STRBUF_INIT;
334 int needs_pushing = 0;
335 argv[1] = sha1_to_hex(sha1);
337 memset(&cp, 0, sizeof(cp));
338 cp.argv = argv;
339 cp.env = local_repo_env;
340 cp.git_cmd = 1;
341 cp.no_stdin = 1;
342 cp.out = -1;
343 cp.dir = path;
344 if (start_command(&cp))
345 die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
346 sha1_to_hex(sha1), path);
347 if (strbuf_read(&buf, cp.out, 41))
348 needs_pushing = 1;
349 finish_command(&cp);
350 close(cp.out);
351 strbuf_release(&buf);
352 return needs_pushing;
353 }
354 return 0;
356}
357static void collect_submodules_from_diff(struct diff_queue_struct *q,
359 struct diff_options *options,
360 void *data)
361{
362 int i;
363 struct string_list *needs_pushing = data;
364 for (i = 0; i < q->nr; i++) {
366 struct diff_filepair *p = q->queue[i];
367 if (!S_ISGITLINK(p->two->mode))
368 continue;
369 if (submodule_needs_pushing(p->two->path, p->two->sha1))
370 string_list_insert(needs_pushing, p->two->path);
371 }
372}
373static void find_unpushed_submodule_commits(struct commit *commit,
375 struct string_list *needs_pushing)
376{
377 struct rev_info rev;
378 init_revisions(&rev, NULL);
380 rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
381 rev.diffopt.format_callback = collect_submodules_from_diff;
382 rev.diffopt.format_callback_data = needs_pushing;
383 diff_tree_combined_merge(commit, 1, &rev);
384}
385int find_unpushed_submodules(unsigned char new_sha1[20],
387 const char *remotes_name, struct string_list *needs_pushing)
388{
389 struct rev_info rev;
390 struct commit *commit;
391 const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
392 int argc = ARRAY_SIZE(argv) - 1;
393 char *sha1_copy;
394 struct strbuf remotes_arg = STRBUF_INIT;
396 strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
398 init_revisions(&rev, NULL);
399 sha1_copy = xstrdup(sha1_to_hex(new_sha1));
400 argv[1] = sha1_copy;
401 argv[3] = remotes_arg.buf;
402 setup_revisions(argc, argv, &rev, NULL);
403 if (prepare_revision_walk(&rev))
404 die("revision walk setup failed");
405 while ((commit = get_revision(&rev)) != NULL)
407 find_unpushed_submodule_commits(commit, needs_pushing);
408 reset_revision_walk();
410 free(sha1_copy);
411 strbuf_release(&remotes_arg);
412 return needs_pushing->nr;
414}
415static int push_submodule(const char *path)
417{
418 if (add_submodule_odb(path))
419 return 1;
420 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
422 struct child_process cp;
423 const char *argv[] = {"push", NULL};
424 memset(&cp, 0, sizeof(cp));
426 cp.argv = argv;
427 cp.env = local_repo_env;
428 cp.git_cmd = 1;
429 cp.no_stdin = 1;
430 cp.dir = path;
431 if (run_command(&cp))
432 return 0;
433 close(cp.out);
434 }
435 return 1;
437}
438int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
440{
441 int i, ret = 1;
442 struct string_list needs_pushing;
443 memset(&needs_pushing, 0, sizeof(struct string_list));
445 needs_pushing.strdup_strings = 1;
446 if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
448 return 1;
449 for (i = 0; i < needs_pushing.nr; i++) {
451 const char *path = needs_pushing.items[i].string;
452 fprintf(stderr, "Pushing submodule '%s'\n", path);
453 if (!push_submodule(path)) {
454 fprintf(stderr, "Unable to push submodule '%s'\n", path);
455 ret = 0;
456 }
457 }
458 string_list_clear(&needs_pushing, 0);
460 return ret;
462}
463static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
465{
466 int is_present = 0;
467 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
468 /* Even if the submodule is checked out and the commit is
469 * present, make sure it is reachable from a ref. */
470 struct child_process cp;
471 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
472 struct strbuf buf = STRBUF_INIT;
473 argv[3] = sha1_to_hex(sha1);
475 memset(&cp, 0, sizeof(cp));
476 cp.argv = argv;
477 cp.env = local_repo_env;
478 cp.git_cmd = 1;
479 cp.no_stdin = 1;
480 cp.out = -1;
481 cp.dir = path;
482 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
483 is_present = 1;
484 close(cp.out);
486 strbuf_release(&buf);
487 }
488 return is_present;
489}
490static void submodule_collect_changed_cb(struct diff_queue_struct *q,
492 struct diff_options *options,
493 void *data)
494{
495 int i;
496 for (i = 0; i < q->nr; i++) {
497 struct diff_filepair *p = q->queue[i];
498 if (!S_ISGITLINK(p->two->mode))
499 continue;
500 if (S_ISGITLINK(p->one->mode)) {
502 /* NEEDSWORK: We should honor the name configured in
503 * the .gitmodules file of the commit we are examining
504 * here to be able to correctly follow submodules
505 * being moved around. */
506 struct string_list_item *path;
507 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
508 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
509 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
510 } else {
511 /* Submodule is new or was moved here */
512 /* NEEDSWORK: When the .git directories of submodules
513 * live inside the superprojects .git directory some
514 * day we should fetch new submodules directly into
515 * that location too when config or options request
516 * that so they can be checked out from there. */
517 continue;
518 }
519 }
520}
521static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
523 int flags, void *data)
524{
525 sha1_array_append(data, sha1);
526 return 0;
527}
528void check_for_new_submodule_commits(unsigned char new_sha1[20])
530{
531 if (!initialized_fetch_ref_tips) {
532 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
533 initialized_fetch_ref_tips = 1;
534 }
535 sha1_array_append(&ref_tips_after_fetch, new_sha1);
537}
538static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
540{
541 argv_array_push(data, sha1_to_hex(sha1));
542}
543static void calculate_changed_submodule_paths(void)
545{
546 struct rev_info rev;
547 struct commit *commit;
548 struct argv_array argv = ARGV_ARRAY_INIT;
549 /* No need to check if there are no submodules configured */
551 if (!config_name_for_path.nr)
552 return;
553 init_revisions(&rev, NULL);
555 argv_array_push(&argv, "--"); /* argv[0] program name */
556 sha1_array_for_each_unique(&ref_tips_after_fetch,
557 add_sha1_to_argv, &argv);
558 argv_array_push(&argv, "--not");
559 sha1_array_for_each_unique(&ref_tips_before_fetch,
560 add_sha1_to_argv, &argv);
561 setup_revisions(argv.argc, argv.argv, &rev, NULL);
562 if (prepare_revision_walk(&rev))
563 die("revision walk setup failed");
564 /*
566 * Collect all submodules (whether checked out or not) for which new
567 * commits have been recorded upstream in "changed_submodule_paths".
568 */
569 while ((commit = get_revision(&rev))) {
570 struct commit_list *parent = commit->parents;
571 while (parent) {
572 struct diff_options diff_opts;
573 diff_setup(&diff_opts);
574 DIFF_OPT_SET(&diff_opts, RECURSIVE);
575 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
576 diff_opts.format_callback = submodule_collect_changed_cb;
577 diff_setup_done(&diff_opts);
578 diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
579 diffcore_std(&diff_opts);
580 diff_flush(&diff_opts);
581 parent = parent->next;
582 }
583 }
584 argv_array_clear(&argv);
586 sha1_array_clear(&ref_tips_before_fetch);
587 sha1_array_clear(&ref_tips_after_fetch);
588 initialized_fetch_ref_tips = 0;
589}
590int fetch_populated_submodules(const struct argv_array *options,
592 const char *prefix, int command_line_option,
593 int quiet)
594{
595 int i, result = 0;
596 struct child_process cp;
597 struct argv_array argv = ARGV_ARRAY_INIT;
598 struct string_list_item *name_for_path;
599 const char *work_tree = get_git_work_tree();
600 if (!work_tree)
601 goto out;
602 if (!the_index.initialized)
604 if (read_cache() < 0)
605 die("index file corrupt");
606 argv_array_push(&argv, "fetch");
608 for (i = 0; i < options->argc; i++)
609 argv_array_push(&argv, options->argv[i]);
610 argv_array_push(&argv, "--recurse-submodules-default");
611 /* default value, "--submodule-prefix" and its value are added later */
612 memset(&cp, 0, sizeof(cp));
614 cp.env = local_repo_env;
615 cp.git_cmd = 1;
616 cp.no_stdin = 1;
617 calculate_changed_submodule_paths();
619 for (i = 0; i < active_nr; i++) {
621 struct strbuf submodule_path = STRBUF_INIT;
622 struct strbuf submodule_git_dir = STRBUF_INIT;
623 struct strbuf submodule_prefix = STRBUF_INIT;
624 struct cache_entry *ce = active_cache[i];
625 const char *git_dir, *name, *default_argv;
626 if (!S_ISGITLINK(ce->ce_mode))
628 continue;
629 name = ce->name;
631 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
632 if (name_for_path)
633 name = name_for_path->util;
634 default_argv = "yes";
636 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
637 struct string_list_item *fetch_recurse_submodules_option;
638 fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
639 if (fetch_recurse_submodules_option) {
640 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
641 continue;
642 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
643 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
644 continue;
645 default_argv = "on-demand";
646 }
647 } else {
648 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
649 gitmodules_is_unmerged)
650 continue;
651 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
652 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
653 continue;
654 default_argv = "on-demand";
655 }
656 }
657 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
658 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
659 continue;
660 default_argv = "on-demand";
661 }
662 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
664 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
665 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
666 git_dir = read_gitfile(submodule_git_dir.buf);
667 if (!git_dir)
668 git_dir = submodule_git_dir.buf;
669 if (is_directory(git_dir)) {
670 if (!quiet)
671 printf("Fetching submodule %s%s\n", prefix, ce->name);
672 cp.dir = submodule_path.buf;
673 argv_array_push(&argv, default_argv);
674 argv_array_push(&argv, "--submodule-prefix");
675 argv_array_push(&argv, submodule_prefix.buf);
676 cp.argv = argv.argv;
677 if (run_command(&cp))
678 result = 1;
679 argv_array_pop(&argv);
680 argv_array_pop(&argv);
681 argv_array_pop(&argv);
682 }
683 strbuf_release(&submodule_path);
684 strbuf_release(&submodule_git_dir);
685 strbuf_release(&submodule_prefix);
686 }
687 argv_array_clear(&argv);
688out:
689 string_list_clear(&changed_submodule_paths, 1);
690 return result;
691}
692unsigned is_submodule_modified(const char *path, int ignore_untracked)
694{
695 ssize_t len;
696 struct child_process cp;
697 const char *argv[] = {
698 "status",
699 "--porcelain",
700 NULL,
701 NULL,
702 };
703 struct strbuf buf = STRBUF_INIT;
704 unsigned dirty_submodule = 0;
705 const char *line, *next_line;
706 const char *git_dir;
707 strbuf_addf(&buf, "%s/.git", path);
709 git_dir = read_gitfile(buf.buf);
710 if (!git_dir)
711 git_dir = buf.buf;
712 if (!is_directory(git_dir)) {
713 strbuf_release(&buf);
714 /* The submodule is not checked out, so it is not modified */
715 return 0;
716 }
718 strbuf_reset(&buf);
719 if (ignore_untracked)
721 argv[2] = "-uno";
722 memset(&cp, 0, sizeof(cp));
724 cp.argv = argv;
725 cp.env = local_repo_env;
726 cp.git_cmd = 1;
727 cp.no_stdin = 1;
728 cp.out = -1;
729 cp.dir = path;
730 if (start_command(&cp))
731 die("Could not run 'git status --porcelain' in submodule %s", path);
732 len = strbuf_read(&buf, cp.out, 1024);
734 line = buf.buf;
735 while (len > 2) {
736 if ((line[0] == '?') && (line[1] == '?')) {
737 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
738 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
739 break;
740 } else {
741 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
742 if (ignore_untracked ||
743 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
744 break;
745 }
746 next_line = strchr(line, '\n');
747 if (!next_line)
748 break;
749 next_line++;
750 len -= (next_line - line);
751 line = next_line;
752 }
753 close(cp.out);
754 if (finish_command(&cp))
756 die("'git status --porcelain' failed in submodule %s", path);
757 strbuf_release(&buf);
759 return dirty_submodule;
760}
761static int find_first_merges(struct object_array *result, const char *path,
763 struct commit *a, struct commit *b)
764{
765 int i, j;
766 struct object_array merges;
767 struct commit *commit;
768 int contains_another;
769 char merged_revision[42];
771 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
772 "--all", merged_revision, NULL };
773 struct rev_info revs;
774 struct setup_revision_opt rev_opts;
775 memset(&merges, 0, sizeof(merges));
777 memset(result, 0, sizeof(struct object_array));
778 memset(&rev_opts, 0, sizeof(rev_opts));
779 /* get all revisions that merge commit a */
781 snprintf(merged_revision, sizeof(merged_revision), "^%s",
782 sha1_to_hex(a->object.sha1));
783 init_revisions(&revs, NULL);
784 rev_opts.submodule = path;
785 setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
786 /* save all revisions from the above list that contain b */
788 if (prepare_revision_walk(&revs))
789 die("revision walk setup failed");
790 while ((commit = get_revision(&revs)) != NULL) {
791 struct object *o = &(commit->object);
792 if (in_merge_bases(b, commit))
793 add_object_array(o, NULL, &merges);
794 }
795 reset_revision_walk();
796 /* Now we've got all merges that contain a and b. Prune all
798 * merges that contain another found merge and save them in
799 * result.
800 */
801 for (i = 0; i < merges.nr; i++) {
802 struct commit *m1 = (struct commit *) merges.objects[i].item;
803 contains_another = 0;
805 for (j = 0; j < merges.nr; j++) {
806 struct commit *m2 = (struct commit *) merges.objects[j].item;
807 if (i != j && in_merge_bases(m2, m1)) {
808 contains_another = 1;
809 break;
810 }
811 }
812 if (!contains_another)
814 add_object_array(merges.objects[i].item,
815 merges.objects[i].name, result);
816 }
817 free(merges.objects);
819 return result->nr;
820}
821static void print_commit(struct commit *commit)
823{
824 struct strbuf sb = STRBUF_INIT;
825 struct pretty_print_context ctx = {0};
826 ctx.date_mode = DATE_NORMAL;
827 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
828 fprintf(stderr, "%s\n", sb.buf);
829 strbuf_release(&sb);
830}
831#define MERGE_WARNING(path, msg) \
833 warning("Failed to merge submodule %s (%s)", path, msg);
834int merge_submodule(unsigned char result[20], const char *path,
836 const unsigned char base[20], const unsigned char a[20],
837 const unsigned char b[20], int search)
838{
839 struct commit *commit_base, *commit_a, *commit_b;
840 int parent_count;
841 struct object_array merges;
842 int i;
844 /* store a in result in case we fail */
846 hashcpy(result, a);
847 /* we can not handle deletion conflicts */
849 if (is_null_sha1(base))
850 return 0;
851 if (is_null_sha1(a))
852 return 0;
853 if (is_null_sha1(b))
854 return 0;
855 if (add_submodule_odb(path)) {
857 MERGE_WARNING(path, "not checked out");
858 return 0;
859 }
860 if (!(commit_base = lookup_commit_reference(base)) ||
862 !(commit_a = lookup_commit_reference(a)) ||
863 !(commit_b = lookup_commit_reference(b))) {
864 MERGE_WARNING(path, "commits not present");
865 return 0;
866 }
867 /* check whether both changes are forward */
869 if (!in_merge_bases(commit_base, commit_a) ||
870 !in_merge_bases(commit_base, commit_b)) {
871 MERGE_WARNING(path, "commits don't follow merge-base");
872 return 0;
873 }
874 /* Case #1: a is contained in b or vice versa */
876 if (in_merge_bases(commit_a, commit_b)) {
877 hashcpy(result, b);
878 return 1;
879 }
880 if (in_merge_bases(commit_b, commit_a)) {
881 hashcpy(result, a);
882 return 1;
883 }
884 /*
886 * Case #2: There are one or more merges that contain a and b in
887 * the submodule. If there is only one, then present it as a
888 * suggestion to the user, but leave it marked unmerged so the
889 * user needs to confirm the resolution.
890 */
891 /* Skip the search if makes no sense to the calling context. */
893 if (!search)
894 return 0;
895 /* find commit which merges them */
897 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
898 switch (parent_count) {
899 case 0:
900 MERGE_WARNING(path, "merge following commits not found");
901 break;
902 case 1:
904 MERGE_WARNING(path, "not fast-forward");
905 fprintf(stderr, "Found a possible merge resolution "
906 "for the submodule:\n");
907 print_commit((struct commit *) merges.objects[0].item);
908 fprintf(stderr,
909 "If this is correct simply add it to the index "
910 "for example\n"
911 "by using:\n\n"
912 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
913 "which will accept this suggestion.\n",
914 sha1_to_hex(merges.objects[0].item->sha1), path);
915 break;
916 default:
918 MERGE_WARNING(path, "multiple merges found");
919 for (i = 0; i < merges.nr; i++)
920 print_commit((struct commit *) merges.objects[i].item);
921 }
922 free(merges.objects);
924 return 0;
925}