Sync with maint
[git/git.git] / submodule.c
CommitLineData
752c0c24
JS
1#include "cache.h"
2#include "submodule.h"
3#include "dir.h"
4#include "diff.h"
5#include "commit.h"
6#include "revision.h"
ee6fc514 7#include "run-command.h"
c7e1a736 8#include "diffcore.h"
68d03e4a 9#include "refs.h"
aee9c7d6 10#include "string-list.h"
6859de45 11#include "sha1-array.h"
c1189cae 12#include "argv-array.h"
aee9c7d6 13
c2e86add
SB
14static 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;
88a21979 17static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
2071fb01 18static struct string_list changed_submodule_paths;
6859de45
JK
19static int initialized_fetch_ref_tips;
20static struct sha1_array ref_tips_before_fetch;
21static struct sha1_array ref_tips_after_fetch;
22
d4e98b58
JL
23/*
24 * The following flag is set if the .gitmodules file is unmerged. We then
25 * disable recursion for all submodules where .git/config doesn't have a
26 * matching config entry because we can't guess what might be configured in
27 * .gitmodules unless the user resolves the conflict. When a command line
28 * option is given (which always overrides configuration) this flag will be
29 * ignored.
30 */
31static int gitmodules_is_unmerged;
752c0c24 32
cb58c932 33static int add_submodule_odb(const char *path)
752c0c24
JS
34{
35 struct strbuf objects_directory = STRBUF_INIT;
36 struct alternate_object_database *alt_odb;
de7a7960 37 int ret = 0;
eee49b6c 38 const char *git_dir;
752c0c24 39
eee49b6c 40 strbuf_addf(&objects_directory, "%s/.git", path);
13d6ec91 41 git_dir = read_gitfile(objects_directory.buf);
eee49b6c
JL
42 if (git_dir) {
43 strbuf_reset(&objects_directory);
44 strbuf_addstr(&objects_directory, git_dir);
45 }
46 strbuf_addstr(&objects_directory, "/objects/");
de7a7960
JL
47 if (!is_directory(objects_directory.buf)) {
48 ret = -1;
49 goto done;
50 }
752c0c24
JS
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))
de7a7960 56 goto done;
752c0c24
JS
57
58 alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
59 alt_odb->next = alt_odb_list;
60 strcpy(alt_odb->base, objects_directory.buf);
61 alt_odb->name = alt_odb->base + objects_directory.len;
62 alt_odb->name[2] = '/';
63 alt_odb->name[40] = '\0';
64 alt_odb->name[41] = '\0';
65 alt_odb_list = alt_odb;
5e73633d
HV
66
67 /* add possible alternates from the submodule */
68 read_info_alternates(objects_directory.buf, 0);
752c0c24 69 prepare_alt_odb();
de7a7960
JL
70done:
71 strbuf_release(&objects_directory);
72 return ret;
752c0c24
JS
73}
74
aee9c7d6
JL
75void 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);
d4e98b58
JL
84 else if (gitmodules_is_unmerged)
85 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
aee9c7d6
JL
86 }
87}
88
7dce19d3 89int submodule_config(const char *var, const char *value, void *cb)
302ad7a9
JL
90{
91 if (!prefixcmp(var, "submodule."))
92 return parse_submodule_config_option(var, value);
be254a0e 93 else if (!strcmp(var, "fetch.recursesubmodules")) {
1fb25502 94 config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
be254a0e
JL
95 return 0;
96 }
302ad7a9
JL
97 return 0;
98}
99
100void gitmodules_config(void)
101{
102 const char *work_tree = get_git_work_tree();
103 if (work_tree) {
104 struct strbuf gitmodules_path = STRBUF_INIT;
d4e98b58 105 int pos;
302ad7a9
JL
106 strbuf_addstr(&gitmodules_path, work_tree);
107 strbuf_addstr(&gitmodules_path, "/.gitmodules");
d4e98b58
JL
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
121 if (!gitmodules_is_unmerged)
122 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
302ad7a9
JL
123 strbuf_release(&gitmodules_path);
124 }
125}
126
aee9c7d6
JL
127int parse_submodule_config_option(const char *var, const char *value)
128{
aee9c7d6 129 struct string_list_item *config;
9edbb8b1
JK
130 const char *name, *key;
131 int namelen;
aee9c7d6 132
9edbb8b1
JK
133 if (parse_config_key(var, "submodule", &name, &namelen, &key) < 0 || !name)
134 return 0;
aee9c7d6 135
9edbb8b1 136 if (!strcmp(key, "path")) {
aee9c7d6
JL
137 config = unsorted_string_list_lookup(&config_name_for_path, value);
138 if (config)
139 free(config->util);
140 else
141 config = string_list_append(&config_name_for_path, xstrdup(value));
6bfe19ee 142 config->util = xmemdupz(name, namelen);
9edbb8b1 143 } else if (!strcmp(key, "fetchrecursesubmodules")) {
6bfe19ee
JK
144 char *name_cstr = xmemdupz(name, namelen);
145 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name_cstr);
c1a3c364 146 if (!config)
6bfe19ee
JK
147 config = string_list_append(&config_fetch_recurse_submodules_for_name, name_cstr);
148 else
149 free(name_cstr);
bf42b384 150 config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
9edbb8b1 151 } else if (!strcmp(key, "ignore")) {
6bfe19ee
JK
152 char *name_cstr;
153
aee9c7d6
JL
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
6bfe19ee
JK
160 name_cstr = xmemdupz(name, namelen);
161 config = unsorted_string_list_lookup(&config_ignore_for_name, name_cstr);
162 if (config) {
aee9c7d6 163 free(config->util);
6bfe19ee
JK
164 free(name_cstr);
165 } else
166 config = string_list_append(&config_ignore_for_name, name_cstr);
aee9c7d6
JL
167 config->util = xstrdup(value);
168 return 0;
169 }
170 return 0;
171}
172
46a958b3
JL
173void handle_ignore_submodules_arg(struct diff_options *diffopt,
174 const char *arg)
175{
be4f2b40
JS
176 DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
177 DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
178 DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
179
46a958b3
JL
180 if (!strcmp(arg, "all"))
181 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
182 else if (!strcmp(arg, "untracked"))
183 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
184 else if (!strcmp(arg, "dirty"))
185 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
aee9c7d6 186 else if (strcmp(arg, "none"))
46a958b3
JL
187 die("bad --ignore-submodules argument: %s", arg);
188}
189
808a95dc
JN
190static int prepare_submodule_summary(struct rev_info *rev, const char *path,
191 struct commit *left, struct commit *right,
192 int *fast_forward, int *fast_backward)
193{
194 struct commit_list *merge_bases, *list;
195
196 init_revisions(rev, NULL);
197 setup_revisions(0, NULL, rev, NULL);
198 rev->left_right = 1;
199 rev->first_parent_only = 1;
200 left->object.flags |= SYMMETRIC_LEFT;
201 add_pending_object(rev, &left->object, path);
202 add_pending_object(rev, &right->object, path);
203 merge_bases = get_merge_bases(left, right, 1);
204 if (merge_bases) {
205 if (merge_bases->item == left)
206 *fast_forward = 1;
207 else if (merge_bases->item == right)
208 *fast_backward = 1;
209 }
210 for (list = merge_bases; list; list = list->next) {
211 list->item->object.flags |= UNINTERESTING;
212 add_pending_object(rev, &list->item->object,
213 sha1_to_hex(list->item->object.sha1));
214 }
215 return prepare_revision_walk(rev);
216}
217
218static void print_submodule_summary(struct rev_info *rev, FILE *f,
219 const char *del, const char *add, const char *reset)
220{
221 static const char format[] = " %m %s";
222 struct strbuf sb = STRBUF_INIT;
223 struct commit *commit;
224
225 while ((commit = get_revision(rev))) {
226 struct pretty_print_context ctx = {0};
227 ctx.date_mode = rev->date_mode;
228 strbuf_setlen(&sb, 0);
229 if (commit->object.flags & SYMMETRIC_LEFT) {
230 if (del)
231 strbuf_addstr(&sb, del);
232 }
233 else if (add)
234 strbuf_addstr(&sb, add);
235 format_commit_message(commit, format, &sb, &ctx);
236 if (reset)
237 strbuf_addstr(&sb, reset);
238 strbuf_addch(&sb, '\n');
239 fprintf(f, "%s", sb.buf);
240 }
241 strbuf_release(&sb);
242}
243
88a21979
JL
244int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
245{
246 switch (git_config_maybe_bool(opt, arg)) {
247 case 1:
248 return RECURSE_SUBMODULES_ON;
249 case 0:
250 return RECURSE_SUBMODULES_OFF;
251 default:
252 if (!strcmp(arg, "on-demand"))
253 return RECURSE_SUBMODULES_ON_DEMAND;
254 die("bad %s argument: %s", opt, arg);
255 }
256}
257
752c0c24
JS
258void show_submodule_summary(FILE *f, const char *path,
259 unsigned char one[20], unsigned char two[20],
4e215131 260 unsigned dirty_submodule, const char *meta,
752c0c24
JS
261 const char *del, const char *add, const char *reset)
262{
263 struct rev_info rev;
83715497 264 struct commit *left = NULL, *right = NULL;
752c0c24
JS
265 const char *message = NULL;
266 struct strbuf sb = STRBUF_INIT;
752c0c24
JS
267 int fast_forward = 0, fast_backward = 0;
268
269 if (is_null_sha1(two))
270 message = "(submodule deleted)";
271 else if (add_submodule_odb(path))
272 message = "(not checked out)";
273 else if (is_null_sha1(one))
274 message = "(new submodule)";
275 else if (!(left = lookup_commit_reference(one)) ||
276 !(right = lookup_commit_reference(two)))
277 message = "(commits not present)";
83715497
JK
278 else if (prepare_submodule_summary(&rev, path, left, right,
279 &fast_forward, &fast_backward))
808a95dc 280 message = "(revision walker failed)";
752c0c24 281
c7e1a736
JL
282 if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
283 fprintf(f, "Submodule %s contains untracked content\n", path);
284 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
285 fprintf(f, "Submodule %s contains modified content\n", path);
286
287 if (!hashcmp(one, two)) {
288 strbuf_release(&sb);
289 return;
290 }
291
4e215131 292 strbuf_addf(&sb, "%sSubmodule %s %s..", meta, path,
752c0c24
JS
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)
4e215131 298 strbuf_addf(&sb, " %s%s\n", message, reset);
752c0c24 299 else
4e215131 300 strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
752c0c24
JS
301 fwrite(sb.buf, sb.len, 1, f);
302
83715497 303 if (!message) /* only NULL if we succeeded in setting up the walk */
808a95dc 304 print_submodule_summary(&rev, f, del, add, reset);
83715497 305 if (left)
752c0c24 306 clear_commit_marks(left, ~0);
83715497 307 if (right)
752c0c24 308 clear_commit_marks(right, ~0);
808a95dc 309
752c0c24
JS
310 strbuf_release(&sb);
311}
ee6fc514 312
be254a0e
JL
313void set_config_fetch_recurse_submodules(int value)
314{
315 config_fetch_recurse_submodules = value;
316}
317
d2b17b32
FG
318static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
319{
320 return 1;
321}
322
323static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
324{
325 if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
326 return 0;
327
328 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
329 struct child_process cp;
330 const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
331 struct strbuf buf = STRBUF_INIT;
332 int needs_pushing = 0;
333
334 argv[1] = sha1_to_hex(sha1);
335 memset(&cp, 0, sizeof(cp));
336 cp.argv = argv;
337 cp.env = local_repo_env;
338 cp.git_cmd = 1;
339 cp.no_stdin = 1;
340 cp.out = -1;
341 cp.dir = path;
342 if (start_command(&cp))
343 die("Could not run 'git rev-list %s --not --remotes -n 1' command in submodule %s",
344 sha1_to_hex(sha1), path);
345 if (strbuf_read(&buf, cp.out, 41))
346 needs_pushing = 1;
347 finish_command(&cp);
348 close(cp.out);
349 strbuf_release(&buf);
350 return needs_pushing;
351 }
352
353 return 0;
354}
355
356static void collect_submodules_from_diff(struct diff_queue_struct *q,
357 struct diff_options *options,
358 void *data)
359{
360 int i;
a762e51e 361 struct string_list *needs_pushing = data;
d2b17b32
FG
362
363 for (i = 0; i < q->nr; i++) {
364 struct diff_filepair *p = q->queue[i];
365 if (!S_ISGITLINK(p->two->mode))
366 continue;
a762e51e
HV
367 if (submodule_needs_pushing(p->two->path, p->two->sha1))
368 string_list_insert(needs_pushing, p->two->path);
d2b17b32
FG
369 }
370}
371
a762e51e
HV
372static void find_unpushed_submodule_commits(struct commit *commit,
373 struct string_list *needs_pushing)
d2b17b32 374{
d2b17b32
FG
375 struct rev_info rev;
376
d2b17b32
FG
377 init_revisions(&rev, NULL);
378 rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
379 rev.diffopt.format_callback = collect_submodules_from_diff;
380 rev.diffopt.format_callback_data = needs_pushing;
78e98eaf 381 diff_tree_combined_merge(commit, 1, &rev);
d2b17b32
FG
382}
383
a762e51e
HV
384int find_unpushed_submodules(unsigned char new_sha1[20],
385 const char *remotes_name, struct string_list *needs_pushing)
d2b17b32
FG
386{
387 struct rev_info rev;
388 struct commit *commit;
389 const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
390 int argc = ARRAY_SIZE(argv) - 1;
391 char *sha1_copy;
a762e51e 392
d2b17b32
FG
393 struct strbuf remotes_arg = STRBUF_INIT;
394
395 strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
396 init_revisions(&rev, NULL);
397 sha1_copy = xstrdup(sha1_to_hex(new_sha1));
398 argv[1] = sha1_copy;
399 argv[3] = remotes_arg.buf;
400 setup_revisions(argc, argv, &rev, NULL);
401 if (prepare_revision_walk(&rev))
402 die("revision walk setup failed");
403
a762e51e
HV
404 while ((commit = get_revision(&rev)) != NULL)
405 find_unpushed_submodule_commits(commit, needs_pushing);
d2b17b32 406
bcc0a3ea 407 reset_revision_walk();
d2b17b32
FG
408 free(sha1_copy);
409 strbuf_release(&remotes_arg);
410
a762e51e 411 return needs_pushing->nr;
d2b17b32
FG
412}
413
eb21c732
HV
414static int push_submodule(const char *path)
415{
416 if (add_submodule_odb(path))
417 return 1;
418
419 if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
420 struct child_process cp;
421 const char *argv[] = {"push", NULL};
422
423 memset(&cp, 0, sizeof(cp));
424 cp.argv = argv;
425 cp.env = local_repo_env;
426 cp.git_cmd = 1;
427 cp.no_stdin = 1;
428 cp.dir = path;
429 if (run_command(&cp))
430 return 0;
431 close(cp.out);
432 }
433
434 return 1;
435}
436
437int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
438{
439 int i, ret = 1;
440 struct string_list needs_pushing;
441
442 memset(&needs_pushing, 0, sizeof(struct string_list));
443 needs_pushing.strdup_strings = 1;
444
445 if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
446 return 1;
447
448 for (i = 0; i < needs_pushing.nr; i++) {
449 const char *path = needs_pushing.items[i].string;
450 fprintf(stderr, "Pushing submodule '%s'\n", path);
451 if (!push_submodule(path)) {
452 fprintf(stderr, "Unable to push submodule '%s'\n", path);
453 ret = 0;
454 }
455 }
456
457 string_list_clear(&needs_pushing, 0);
458
459 return ret;
460}
461
c16c3e40
JL
462static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
463{
464 int is_present = 0;
465 if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
466 /* Even if the submodule is checked out and the commit is
467 * present, make sure it is reachable from a ref. */
468 struct child_process cp;
469 const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
470 struct strbuf buf = STRBUF_INIT;
471
472 argv[3] = sha1_to_hex(sha1);
473 memset(&cp, 0, sizeof(cp));
474 cp.argv = argv;
475 cp.env = local_repo_env;
476 cp.git_cmd = 1;
477 cp.no_stdin = 1;
478 cp.out = -1;
479 cp.dir = path;
480 if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
481 is_present = 1;
482
483 close(cp.out);
484 strbuf_release(&buf);
485 }
486 return is_present;
487}
488
88a21979
JL
489static void submodule_collect_changed_cb(struct diff_queue_struct *q,
490 struct diff_options *options,
491 void *data)
492{
493 int i;
494 for (i = 0; i < q->nr; i++) {
495 struct diff_filepair *p = q->queue[i];
496 if (!S_ISGITLINK(p->two->mode))
497 continue;
498
499 if (S_ISGITLINK(p->one->mode)) {
500 /* NEEDSWORK: We should honor the name configured in
501 * the .gitmodules file of the commit we are examining
502 * here to be able to correctly follow submodules
503 * being moved around. */
504 struct string_list_item *path;
505 path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
c16c3e40 506 if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
88a21979
JL
507 string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
508 } else {
509 /* Submodule is new or was moved here */
510 /* NEEDSWORK: When the .git directories of submodules
511 * live inside the superprojects .git directory some
512 * day we should fetch new submodules directly into
513 * that location too when config or options request
514 * that so they can be checked out from there. */
515 continue;
516 }
517 }
518}
519
6859de45
JK
520static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
521 int flags, void *data)
522{
523 sha1_array_append(data, sha1);
524 return 0;
525}
526
88a21979 527void check_for_new_submodule_commits(unsigned char new_sha1[20])
6859de45
JK
528{
529 if (!initialized_fetch_ref_tips) {
530 for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
531 initialized_fetch_ref_tips = 1;
532 }
533
534 sha1_array_append(&ref_tips_after_fetch, new_sha1);
535}
536
6859de45
JK
537static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
538{
c1189cae 539 argv_array_push(data, sha1_to_hex(sha1));
6859de45
JK
540}
541
542static void calculate_changed_submodule_paths(void)
88a21979
JL
543{
544 struct rev_info rev;
545 struct commit *commit;
c1189cae 546 struct argv_array argv = ARGV_ARRAY_INIT;
88a21979 547
18322bad
JL
548 /* No need to check if there are no submodules configured */
549 if (!config_name_for_path.nr)
550 return;
551
88a21979 552 init_revisions(&rev, NULL);
c1189cae 553 argv_array_push(&argv, "--"); /* argv[0] program name */
6859de45
JK
554 sha1_array_for_each_unique(&ref_tips_after_fetch,
555 add_sha1_to_argv, &argv);
c1189cae 556 argv_array_push(&argv, "--not");
6859de45
JK
557 sha1_array_for_each_unique(&ref_tips_before_fetch,
558 add_sha1_to_argv, &argv);
559 setup_revisions(argv.argc, argv.argv, &rev, NULL);
88a21979
JL
560 if (prepare_revision_walk(&rev))
561 die("revision walk setup failed");
562
563 /*
564 * Collect all submodules (whether checked out or not) for which new
565 * commits have been recorded upstream in "changed_submodule_paths".
566 */
567 while ((commit = get_revision(&rev))) {
568 struct commit_list *parent = commit->parents;
569 while (parent) {
570 struct diff_options diff_opts;
571 diff_setup(&diff_opts);
ea2d325b 572 DIFF_OPT_SET(&diff_opts, RECURSIVE);
88a21979
JL
573 diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
574 diff_opts.format_callback = submodule_collect_changed_cb;
28452655 575 diff_setup_done(&diff_opts);
88a21979
JL
576 diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
577 diffcore_std(&diff_opts);
578 diff_flush(&diff_opts);
579 parent = parent->next;
580 }
581 }
6859de45 582
c1189cae 583 argv_array_clear(&argv);
6859de45
JK
584 sha1_array_clear(&ref_tips_before_fetch);
585 sha1_array_clear(&ref_tips_after_fetch);
586 initialized_fetch_ref_tips = 0;
88a21979
JL
587}
588
50d89ad6 589int fetch_populated_submodules(const struct argv_array *options,
8f0700dd 590 const char *prefix, int command_line_option,
be254a0e 591 int quiet)
7dce19d3 592{
50d89ad6 593 int i, result = 0;
7dce19d3 594 struct child_process cp;
50d89ad6 595 struct argv_array argv = ARGV_ARRAY_INIT;
7dce19d3
JL
596 struct string_list_item *name_for_path;
597 const char *work_tree = get_git_work_tree();
598 if (!work_tree)
88a21979 599 goto out;
7dce19d3
JL
600
601 if (!the_index.initialized)
602 if (read_cache() < 0)
603 die("index file corrupt");
604
50d89ad6
JL
605 argv_array_push(&argv, "fetch");
606 for (i = 0; i < options->argc; i++)
607 argv_array_push(&argv, options->argv[i]);
608 argv_array_push(&argv, "--recurse-submodules-default");
609 /* default value, "--submodule-prefix" and its value are added later */
7dce19d3
JL
610
611 memset(&cp, 0, sizeof(cp));
7dce19d3
JL
612 cp.env = local_repo_env;
613 cp.git_cmd = 1;
614 cp.no_stdin = 1;
615
6859de45
JK
616 calculate_changed_submodule_paths();
617
7dce19d3
JL
618 for (i = 0; i < active_nr; i++) {
619 struct strbuf submodule_path = STRBUF_INIT;
620 struct strbuf submodule_git_dir = STRBUF_INIT;
621 struct strbuf submodule_prefix = STRBUF_INIT;
622 struct cache_entry *ce = active_cache[i];
88a21979 623 const char *git_dir, *name, *default_argv;
7dce19d3
JL
624
625 if (!S_ISGITLINK(ce->ce_mode))
626 continue;
627
628 name = ce->name;
629 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
630 if (name_for_path)
631 name = name_for_path->util;
632
88a21979 633 default_argv = "yes";
8f0700dd 634 if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
c1a3c364
JL
635 struct string_list_item *fetch_recurse_submodules_option;
636 fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
637 if (fetch_recurse_submodules_option) {
bf42b384 638 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
c1a3c364 639 continue;
bf42b384
JL
640 if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
641 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
642 continue;
643 default_argv = "on-demand";
644 }
c1a3c364 645 } else {
d4e98b58
JL
646 if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
647 gitmodules_is_unmerged)
c1a3c364 648 continue;
88a21979
JL
649 if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
650 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
651 continue;
652 default_argv = "on-demand";
653 }
c1a3c364 654 }
8f0700dd
JL
655 } else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
656 if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
657 continue;
658 default_argv = "on-demand";
be254a0e
JL
659 }
660
7dce19d3
JL
661 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
662 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
663 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
13d6ec91 664 git_dir = read_gitfile(submodule_git_dir.buf);
7dce19d3
JL
665 if (!git_dir)
666 git_dir = submodule_git_dir.buf;
667 if (is_directory(git_dir)) {
668 if (!quiet)
669 printf("Fetching submodule %s%s\n", prefix, ce->name);
670 cp.dir = submodule_path.buf;
50d89ad6
JL
671 argv_array_push(&argv, default_argv);
672 argv_array_push(&argv, "--submodule-prefix");
673 argv_array_push(&argv, submodule_prefix.buf);
674 cp.argv = argv.argv;
7dce19d3
JL
675 if (run_command(&cp))
676 result = 1;
50d89ad6
JL
677 argv_array_pop(&argv);
678 argv_array_pop(&argv);
679 argv_array_pop(&argv);
7dce19d3
JL
680 }
681 strbuf_release(&submodule_path);
682 strbuf_release(&submodule_git_dir);
683 strbuf_release(&submodule_prefix);
684 }
50d89ad6 685 argv_array_clear(&argv);
88a21979
JL
686out:
687 string_list_clear(&changed_submodule_paths, 1);
7dce19d3
JL
688 return result;
689}
690
3bfc4504 691unsigned is_submodule_modified(const char *path, int ignore_untracked)
ee6fc514 692{
c7e1a736 693 ssize_t len;
ee6fc514
JL
694 struct child_process cp;
695 const char *argv[] = {
696 "status",
697 "--porcelain",
698 NULL,
3bfc4504 699 NULL,
ee6fc514 700 };
ee6fc514 701 struct strbuf buf = STRBUF_INIT;
c7e1a736
JL
702 unsigned dirty_submodule = 0;
703 const char *line, *next_line;
eee49b6c 704 const char *git_dir;
ee6fc514 705
eee49b6c 706 strbuf_addf(&buf, "%s/.git", path);
13d6ec91 707 git_dir = read_gitfile(buf.buf);
eee49b6c
JL
708 if (!git_dir)
709 git_dir = buf.buf;
710 if (!is_directory(git_dir)) {
ee6fc514
JL
711 strbuf_release(&buf);
712 /* The submodule is not checked out, so it is not modified */
713 return 0;
714
715 }
716 strbuf_reset(&buf);
717
3bfc4504
JL
718 if (ignore_untracked)
719 argv[2] = "-uno";
720
ee6fc514
JL
721 memset(&cp, 0, sizeof(cp));
722 cp.argv = argv;
eee49b6c 723 cp.env = local_repo_env;
ee6fc514
JL
724 cp.git_cmd = 1;
725 cp.no_stdin = 1;
726 cp.out = -1;
eee49b6c 727 cp.dir = path;
ee6fc514 728 if (start_command(&cp))
6a5cedac 729 die("Could not run 'git status --porcelain' in submodule %s", path);
ee6fc514
JL
730
731 len = strbuf_read(&buf, cp.out, 1024);
c7e1a736
JL
732 line = buf.buf;
733 while (len > 2) {
734 if ((line[0] == '?') && (line[1] == '?')) {
735 dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
736 if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
737 break;
738 } else {
739 dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
3bfc4504
JL
740 if (ignore_untracked ||
741 (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
c7e1a736
JL
742 break;
743 }
744 next_line = strchr(line, '\n');
745 if (!next_line)
746 break;
747 next_line++;
748 len -= (next_line - line);
749 line = next_line;
750 }
ee6fc514
JL
751 close(cp.out);
752
753 if (finish_command(&cp))
6a5cedac 754 die("'git status --porcelain' failed in submodule %s", path);
ee6fc514 755
ee6fc514 756 strbuf_release(&buf);
c7e1a736 757 return dirty_submodule;
ee6fc514 758}
68d03e4a 759
293ab15e
JL
760int submodule_uses_gitfile(const char *path)
761{
762 struct child_process cp;
763 const char *argv[] = {
764 "submodule",
765 "foreach",
766 "--quiet",
767 "--recursive",
768 "test -f .git",
769 NULL,
770 };
771 struct strbuf buf = STRBUF_INIT;
772 const char *git_dir;
773
774 strbuf_addf(&buf, "%s/.git", path);
775 git_dir = read_gitfile(buf.buf);
776 if (!git_dir) {
777 strbuf_release(&buf);
778 return 0;
779 }
780 strbuf_release(&buf);
781
782 /* Now test that all nested submodules use a gitfile too */
783 memset(&cp, 0, sizeof(cp));
784 cp.argv = argv;
785 cp.env = local_repo_env;
786 cp.git_cmd = 1;
787 cp.no_stdin = 1;
788 cp.no_stderr = 1;
789 cp.no_stdout = 1;
790 cp.dir = path;
791 if (run_command(&cp))
792 return 0;
793
794 return 1;
795}
796
797int ok_to_remove_submodule(const char *path)
798{
799 struct stat st;
800 ssize_t len;
801 struct child_process cp;
802 const char *argv[] = {
803 "status",
804 "--porcelain",
805 "-u",
806 "--ignore-submodules=none",
807 NULL,
808 };
809 struct strbuf buf = STRBUF_INIT;
810 int ok_to_remove = 1;
811
812 if ((lstat(path, &st) < 0) || is_empty_dir(path))
813 return 1;
814
815 if (!submodule_uses_gitfile(path))
816 return 0;
817
818 memset(&cp, 0, sizeof(cp));
819 cp.argv = argv;
820 cp.env = local_repo_env;
821 cp.git_cmd = 1;
822 cp.no_stdin = 1;
823 cp.out = -1;
824 cp.dir = path;
825 if (start_command(&cp))
826 die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
827
828 len = strbuf_read(&buf, cp.out, 1024);
829 if (len > 2)
830 ok_to_remove = 0;
831 close(cp.out);
832
833 if (finish_command(&cp))
834 die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
835
836 strbuf_release(&buf);
837 return ok_to_remove;
838}
839
68d03e4a
HV
840static int find_first_merges(struct object_array *result, const char *path,
841 struct commit *a, struct commit *b)
842{
843 int i, j;
844 struct object_array merges;
845 struct commit *commit;
846 int contains_another;
847
848 char merged_revision[42];
849 const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
850 "--all", merged_revision, NULL };
851 struct rev_info revs;
852 struct setup_revision_opt rev_opts;
853
854 memset(&merges, 0, sizeof(merges));
855 memset(result, 0, sizeof(struct object_array));
856 memset(&rev_opts, 0, sizeof(rev_opts));
857
858 /* get all revisions that merge commit a */
859 snprintf(merged_revision, sizeof(merged_revision), "^%s",
860 sha1_to_hex(a->object.sha1));
861 init_revisions(&revs, NULL);
862 rev_opts.submodule = path;
863 setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
864
865 /* save all revisions from the above list that contain b */
866 if (prepare_revision_walk(&revs))
867 die("revision walk setup failed");
868 while ((commit = get_revision(&revs)) != NULL) {
869 struct object *o = &(commit->object);
a20efee9 870 if (in_merge_bases(b, commit))
68d03e4a
HV
871 add_object_array(o, NULL, &merges);
872 }
bcc0a3ea 873 reset_revision_walk();
68d03e4a
HV
874
875 /* Now we've got all merges that contain a and b. Prune all
876 * merges that contain another found merge and save them in
877 * result.
878 */
879 for (i = 0; i < merges.nr; i++) {
880 struct commit *m1 = (struct commit *) merges.objects[i].item;
881
882 contains_another = 0;
883 for (j = 0; j < merges.nr; j++) {
884 struct commit *m2 = (struct commit *) merges.objects[j].item;
a20efee9 885 if (i != j && in_merge_bases(m2, m1)) {
68d03e4a
HV
886 contains_another = 1;
887 break;
888 }
889 }
890
891 if (!contains_another)
892 add_object_array(merges.objects[i].item,
893 merges.objects[i].name, result);
894 }
895
896 free(merges.objects);
897 return result->nr;
898}
899
900static void print_commit(struct commit *commit)
901{
902 struct strbuf sb = STRBUF_INIT;
903 struct pretty_print_context ctx = {0};
904 ctx.date_mode = DATE_NORMAL;
905 format_commit_message(commit, " %h: %m %s", &sb, &ctx);
906 fprintf(stderr, "%s\n", sb.buf);
907 strbuf_release(&sb);
908}
909
910#define MERGE_WARNING(path, msg) \
911 warning("Failed to merge submodule %s (%s)", path, msg);
912
913int merge_submodule(unsigned char result[20], const char *path,
914 const unsigned char base[20], const unsigned char a[20],
80988783 915 const unsigned char b[20], int search)
68d03e4a
HV
916{
917 struct commit *commit_base, *commit_a, *commit_b;
918 int parent_count;
919 struct object_array merges;
920
921 int i;
922
923 /* store a in result in case we fail */
924 hashcpy(result, a);
925
926 /* we can not handle deletion conflicts */
927 if (is_null_sha1(base))
928 return 0;
929 if (is_null_sha1(a))
930 return 0;
931 if (is_null_sha1(b))
932 return 0;
933
934 if (add_submodule_odb(path)) {
935 MERGE_WARNING(path, "not checked out");
936 return 0;
937 }
938
939 if (!(commit_base = lookup_commit_reference(base)) ||
940 !(commit_a = lookup_commit_reference(a)) ||
941 !(commit_b = lookup_commit_reference(b))) {
942 MERGE_WARNING(path, "commits not present");
943 return 0;
944 }
945
946 /* check whether both changes are forward */
a20efee9
JH
947 if (!in_merge_bases(commit_base, commit_a) ||
948 !in_merge_bases(commit_base, commit_b)) {
68d03e4a
HV
949 MERGE_WARNING(path, "commits don't follow merge-base");
950 return 0;
951 }
952
953 /* Case #1: a is contained in b or vice versa */
a20efee9 954 if (in_merge_bases(commit_a, commit_b)) {
68d03e4a
HV
955 hashcpy(result, b);
956 return 1;
957 }
a20efee9 958 if (in_merge_bases(commit_b, commit_a)) {
68d03e4a
HV
959 hashcpy(result, a);
960 return 1;
961 }
962
963 /*
964 * Case #2: There are one or more merges that contain a and b in
965 * the submodule. If there is only one, then present it as a
966 * suggestion to the user, but leave it marked unmerged so the
967 * user needs to confirm the resolution.
968 */
969
80988783
BK
970 /* Skip the search if makes no sense to the calling context. */
971 if (!search)
972 return 0;
973
68d03e4a
HV
974 /* find commit which merges them */
975 parent_count = find_first_merges(&merges, path, commit_a, commit_b);
976 switch (parent_count) {
977 case 0:
978 MERGE_WARNING(path, "merge following commits not found");
979 break;
980
981 case 1:
982 MERGE_WARNING(path, "not fast-forward");
983 fprintf(stderr, "Found a possible merge resolution "
984 "for the submodule:\n");
985 print_commit((struct commit *) merges.objects[0].item);
986 fprintf(stderr,
987 "If this is correct simply add it to the index "
988 "for example\n"
989 "by using:\n\n"
990 " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
991 "which will accept this suggestion.\n",
992 sha1_to_hex(merges.objects[0].item->sha1), path);
993 break;
994
995 default:
996 MERGE_WARNING(path, "multiple merges found");
997 for (i = 0; i < merges.nr; i++)
998 print_commit((struct commit *) merges.objects[i].item);
999 }
1000
1001 free(merges.objects);
1002 return 0;
1003}