submodule.c · leroysheep/Socializer

bisect

bisect jch maint master next seen test todo

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1	#define USE_THE_REPOSITORY_VARIABLE
2	#define DISABLE_SIGN_COMPARE_WARNINGS
3
4	#include "git-compat-util.h"
5	#include "abspath.h"
6	#include "repository.h"
7	#include "config.h"
8	#include "submodule-config.h"
9	#include "submodule.h"
10	#include "dir.h"
11	#include "diff.h"
12	#include "commit.h"
13	#include "environment.h"
14	#include "gettext.h"
15	#include "hex.h"
16	#include "revision.h"
17	#include "run-command.h"
18	#include "diffcore.h"
19	#include "refs.h"
20	#include "string-list.h"
21	#include "oid-array.h"
22	#include "strvec.h"
23	#include "thread-utils.h"
24	#include "path.h"
25	#include "remote.h"
26	#include "worktree.h"
27	#include "parse-options.h"
28	#include "object-file.h"
29	#include "object-name.h"
30	#include "odb.h"
31	#include "commit-reach.h"
32	#include "read-cache-ll.h"
33	#include "setup.h"
34	#include "advice.h"
35	#include "url.h"
36
37	static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
38	static int initialized_fetch_ref_tips;
39	static struct oid_array ref_tips_before_fetch;
40	static struct oid_array ref_tips_after_fetch;
41
42	/*
43	* Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
44	* will be disabled because we can't guess what might be configured in
45	* .gitmodules unless the user resolves the conflict.
46	*/
47	int is_gitmodules_unmerged(struct index_state *istate)
48	{
49	int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
50	if (pos < 0) { /* .gitmodules not found or isn't merged */
51	pos = -1 - pos;
52	if (istate->cache_nr > pos) { /* there is a .gitmodules */
53	const struct cache_entry *ce = istate->cache[pos];
54	if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
55	!strcmp(ce->name, GITMODULES_FILE))
56	return 1;
57	}
58	}
59
60	return 0;
61	}
62
63	/*
64	* Check if the .gitmodules file is safe to write.
65	*
66	* Writing to the .gitmodules file requires that the file exists in the
67	* working tree or, if it doesn't, that a brand new .gitmodules file is going
68	* to be created (i.e. it's neither in the index nor in the current branch).
69	*
70	* It is not safe to write to .gitmodules if it's not in the working tree but
71	* it is in the index or in the current branch, because writing new values
72	* (and staging them) would blindly overwrite ALL the old content.
73	*/
74	int is_writing_gitmodules_ok(void)
75	{
76	struct object_id oid;
77	return file_exists(GITMODULES_FILE) \|\|
78	(repo_get_oid(the_repository, GITMODULES_INDEX, &oid) < 0 && repo_get_oid(the_repository, GITMODULES_HEAD, &oid) < 0);
79	}
80
81	/*
82	* Check if the .gitmodules file has unstaged modifications. This must be
83	* checked before allowing modifications to the .gitmodules file with the
84	* intention to stage them later, because when continuing we would stage the
85	* modifications the user didn't stage herself too. That might change in a
86	* future version when we learn to stage the changes we do ourselves without
87	* staging any previous modifications.
88	*/
89	int is_staging_gitmodules_ok(struct index_state *istate)
90	{
91	int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
92
93	if ((pos >= 0) && (pos < istate->cache_nr)) {
94	struct stat st;
95	if (lstat(GITMODULES_FILE, &st) == 0 &&
96	ie_modified(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
97	return 0;
98	}
99
100	return 1;
101	}
102
103	static int for_each_remote_ref_submodule(const char *submodule,
104	refs_for_each_cb fn, void *cb_data)
105	{
106	return refs_for_each_remote_ref(repo_get_submodule_ref_store(the_repository,
107	submodule),
108	fn, cb_data);
109	}
110
111	/*
112	* Try to update the "path" entry in the "submodule.<name>" section of the
113	* .gitmodules file. Return 0 only if a .gitmodules file was found, a section
114	* with the correct path=<oldpath> setting was found and we could update it.
115	*/
116	int update_path_in_gitmodules(const char oldpath, const char newpath)
117	{
118	struct strbuf entry = STRBUF_INIT;
119	const struct submodule *submodule;
120	int ret;
121
122	if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
123	return -1;
124
125	if (is_gitmodules_unmerged(the_repository->index))
126	die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
127
128	submodule = submodule_from_path(the_repository, null_oid(the_hash_algo), oldpath);
129	if (!submodule \|\| !submodule->name) {
130	warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
131	return -1;
132	}
133	strbuf_addstr(&entry, "submodule.");
134	strbuf_addstr(&entry, submodule->name);
135	strbuf_addstr(&entry, ".path");
136	ret = config_set_in_gitmodules_file_gently(entry.buf, newpath);
137	strbuf_release(&entry);
138	return ret;
139	}
140
141	/*
142	* Try to remove the "submodule.<name>" section from .gitmodules where the given
143	* path is configured. Return 0 only if a .gitmodules file was found, a section
144	* with the correct path=<path> setting was found and we could remove it.
145	*/
146	int remove_path_from_gitmodules(const char *path)
147	{
148	struct strbuf sect = STRBUF_INIT;
149	const struct submodule *submodule;
150
151	if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
152	return -1;
153
154	if (is_gitmodules_unmerged(the_repository->index))
155	die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
156
157	submodule = submodule_from_path(the_repository, null_oid(the_hash_algo), path);
158	if (!submodule \|\| !submodule->name) {
159	warning(_("Could not find section in .gitmodules where path=%s"), path);
160	return -1;
161	}
162	strbuf_addstr(&sect, "submodule.");
163	strbuf_addstr(&sect, submodule->name);
164	if (repo_config_rename_section_in_file(the_repository, GITMODULES_FILE, sect.buf, NULL) < 0) {
165	/* Maybe the user already did that, don't error out here */
166	warning(_("Could not remove .gitmodules entry for %s"), path);
167	strbuf_release(&sect);
168	return -1;
169	}
170	strbuf_release(&sect);
171	return 0;
172	}
173
174	void stage_updated_gitmodules(struct index_state *istate)
175	{
176	if (add_file_to_index(istate, GITMODULES_FILE, 0))
177	die(_("staging updated .gitmodules failed"));
178	}
179
180	void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
181	const char *path)
182	{
183	const struct submodule *submodule = submodule_from_path(the_repository,
184	null_oid(the_hash_algo),
185	path);
186	if (submodule) {
187	const char *ignore;
188	char *key;
189
190	key = xstrfmt("submodule.%s.ignore", submodule->name);
191	if (repo_config_get_string_tmp(the_repository, key, &ignore))
192	ignore = submodule->ignore;
193	free(key);
194
195	if (ignore)
196	handle_ignore_submodules_arg(diffopt, ignore);
197	else if (is_gitmodules_unmerged(the_repository->index))
198	diffopt->flags.ignore_submodules = 1;
199	}
200	}
201
202	/* Cheap function that only determines if we're interested in submodules at all */
203	int git_default_submodule_config(const char var, const char value,
204	void *cb UNUSED)
205	{
206	if (!strcmp(var, "submodule.recurse")) {
207	int v = git_config_bool(var, value) ?
208	RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
209	config_update_recurse_submodules = v;
210	}
211	return 0;
212	}
213
214	int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
215	const char *arg, int unset)
216	{
217	if (unset) {
218	config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
219	return 0;
220	}
221	if (arg)
222	config_update_recurse_submodules =
223	parse_update_recurse_submodules_arg(opt->long_name,
224	arg);
225	else
226	config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
227
228	return 0;
229	}
230
231	/*
232	* Determine if a submodule has been initialized at a given 'path'
233	*/
234	/*
235	* NEEDSWORK: Emit a warning if submodule.active exists, but is valueless,
236	* ie, the config looks like: "[submodule] active\n".
237	* Since that is an invalid pathspec, we should inform the user.
238	*/
239	int is_tree_submodule_active(struct repository *repo,
240	const struct object_id *treeish_name,
241	const char *path)
242	{
243	int ret = 0;
244	char *key = NULL;
245	char *value = NULL;
246	const struct string_list *sl;
247	const struct submodule *module;
248
249	module = submodule_from_path(repo, treeish_name, path);
250
251	/* early return if there isn't a path->module mapping */
252	if (!module)
253	return 0;
254
255	/* submodule.<name>.active is set */
256	key = xstrfmt("submodule.%s.active", module->name);
257	if (!repo_config_get_bool(repo, key, &ret)) {
258	free(key);
259	return ret;
260	}
261	free(key);
262
263	/* submodule.active is set */
264	if (!repo_config_get_string_multi(repo, "submodule.active", &sl)) {
265	struct pathspec ps;
266	struct strvec args = STRVEC_INIT;
267	const struct string_list_item *item;
268
269	for_each_string_list_item(item, sl) {
270	strvec_push(&args, item->string);
271	}
272
273	parse_pathspec(&ps, 0, 0, NULL, args.v);
274	ret = match_pathspec(repo->index, &ps, path, strlen(path), 0, NULL, 1);
275
276	strvec_clear(&args);
277	clear_pathspec(&ps);
278	return ret;
279	}
280
281	/* fallback to checking if the URL is set */
282	key = xstrfmt("submodule.%s.url", module->name);
283	ret = !repo_config_get_string(repo, key, &value);
284
285	free(value);
286	free(key);
287	return ret;
288	}
289
290	int is_submodule_active(struct repository repo, const char path)
291	{
292	return is_tree_submodule_active(repo, null_oid(the_hash_algo), path);
293	}
294
295	int is_submodule_populated_gently(const char path, int return_error_code)
296	{
297	int ret = 0;
298	char *gitdir = xstrfmt("%s/.git", path);
299
300	if (resolve_gitdir_gently(gitdir, return_error_code))
301	ret = 1;
302
303	free(gitdir);
304	return ret;
305	}
306
307	/*
308	* Dies if the provided 'prefix' corresponds to an unpopulated submodule
309	*/
310	void die_in_unpopulated_submodule(struct index_state *istate,
311	const char *prefix)
312	{
313	int i, prefixlen;
314
315	if (!prefix)
316	return;
317
318	prefixlen = strlen(prefix);
319
320	for (i = 0; i < istate->cache_nr; i++) {
321	struct cache_entry *ce = istate->cache[i];
322	int ce_len = ce_namelen(ce);
323
324	if (!S_ISGITLINK(ce->ce_mode))
325	continue;
326	if (prefixlen <= ce_len)
327	continue;
328	if (strncmp(ce->name, prefix, ce_len))
329	continue;
330	if (prefix[ce_len] != '/')
331	continue;
332
333	die(_("in unpopulated submodule '%s'"), ce->name);
334	}
335	}
336
337	/*
338	* Dies if any paths in the provided pathspec descends into a submodule
339	*/
340	void die_path_inside_submodule(struct index_state *istate,
341	const struct pathspec *ps)
342	{
343	int i, j;
344
345	for (i = 0; i < istate->cache_nr; i++) {
346	struct cache_entry *ce = istate->cache[i];
347	int ce_len = ce_namelen(ce);
348
349	if (!S_ISGITLINK(ce->ce_mode))
350	continue;
351
352	for (j = 0; j < ps->nr ; j++) {
353	const struct pathspec_item *item = &ps->items[j];
354
355	if (item->len <= ce_len)
356	continue;
357	if (item->match[ce_len] != '/')
358	continue;
359	if (strncmp(ce->name, item->match, ce_len))
360	continue;
361	if (item->len == ce_len + 1)
362	continue;
363
364	die(_("Pathspec '%s' is in submodule '%.*s'"),
365	item->original, ce_len, ce->name);
366	}
367	}
368	}
369
370	enum submodule_update_type parse_submodule_update_type(const char *value)
371	{
372	if (!strcmp(value, "none"))
373	return SM_UPDATE_NONE;
374	else if (!strcmp(value, "checkout"))
375	return SM_UPDATE_CHECKOUT;
376	else if (!strcmp(value, "rebase"))
377	return SM_UPDATE_REBASE;
378	else if (!strcmp(value, "merge"))
379	return SM_UPDATE_MERGE;
380	else if (*value == '!')
381	return SM_UPDATE_COMMAND;
382	else
383	return SM_UPDATE_UNSPECIFIED;
384	}
385
386	int parse_submodule_update_strategy(const char *value,
387	struct submodule_update_strategy *dst)
388	{
389	enum submodule_update_type type;
390
391	free((void*)dst->command);
392	dst->command = NULL;
393
394	type = parse_submodule_update_type(value);
395	if (type == SM_UPDATE_UNSPECIFIED)
396	return -1;
397
398	dst->type = type;
399	if (type == SM_UPDATE_COMMAND)
400	dst->command = xstrdup(value + 1);
401
402	return 0;
403	}
404
405	void submodule_update_strategy_release(struct submodule_update_strategy *strategy)
406	{
407	free((char *) strategy->command);
408	}
409
410	const char *submodule_update_type_to_string(enum submodule_update_type type)
411	{
412	switch (type) {
413	case SM_UPDATE_CHECKOUT:
414	return "checkout";
415	case SM_UPDATE_MERGE:
416	return "merge";
417	case SM_UPDATE_REBASE:
418	return "rebase";
419	case SM_UPDATE_NONE:
420	return "none";
421	case SM_UPDATE_UNSPECIFIED:
422	case SM_UPDATE_COMMAND:
423	BUG("init_submodule() should handle type %d", type);
424	default:
425	BUG("unexpected update strategy type: %d", type);
426	}
427	}
428
429	void handle_ignore_submodules_arg(struct diff_options *diffopt,
430	const char *arg)
431	{
432	diffopt->flags.ignore_submodule_set = 1;
433	diffopt->flags.ignore_submodules = 0;
434	diffopt->flags.ignore_untracked_in_submodules = 0;
435	diffopt->flags.ignore_dirty_submodules = 0;
436
437	if (!strcmp(arg, "all"))
438	diffopt->flags.ignore_submodules = 1;
439	else if (!strcmp(arg, "untracked"))
440	diffopt->flags.ignore_untracked_in_submodules = 1;
441	else if (!strcmp(arg, "dirty"))
442	diffopt->flags.ignore_dirty_submodules = 1;
443	else if (strcmp(arg, "none"))
444	die(_("bad --ignore-submodules argument: %s"), arg);
445	/*
446	* Please update _git_status() in git-completion.bash when you
447	* add new options
448	*/
449	}
450
451	static int prepare_submodule_diff_summary(struct repository r, struct rev_info rev,
452	const char *path,
453	struct commit left, struct commit right,
454	struct commit_list *merge_bases)
455	{
456	struct commit_list *list;
457
458	repo_init_revisions(r, rev, NULL);
459	setup_revisions(0, NULL, rev, NULL);
460	rev->left_right = 1;
461	rev->first_parent_only = 1;
462	left->object.flags \|= SYMMETRIC_LEFT;
463	add_pending_object(rev, &left->object, path);
464	add_pending_object(rev, &right->object, path);
465	for (list = merge_bases; list; list = list->next) {
466	list->item->object.flags \|= UNINTERESTING;
467	add_pending_object(rev, &list->item->object,
468	oid_to_hex(&list->item->object.oid));
469	}
470	return prepare_revision_walk(rev);
471	}
472
473	static void print_submodule_diff_summary(struct repository r, struct rev_info rev, struct diff_options *o)
474	{
475	static const char format[] = " %m %s";
476	struct strbuf sb = STRBUF_INIT;
477	struct commit *commit;
478
479	while ((commit = get_revision(rev))) {
480	struct pretty_print_context ctx = {0};
481	ctx.date_mode = rev->date_mode;
482	ctx.output_encoding = get_log_output_encoding();
483	strbuf_setlen(&sb, 0);
484	repo_format_commit_message(r, commit, format, &sb,
485	&ctx);
486	strbuf_addch(&sb, '\n');
487	if (commit->object.flags & SYMMETRIC_LEFT)
488	diff_emit_submodule_del(o, sb.buf);
489	else
490	diff_emit_submodule_add(o, sb.buf);
491	}
492	strbuf_release(&sb);
493	}
494
495	void prepare_submodule_repo_env(struct strvec *out)
496	{
497	prepare_other_repo_env(out, DEFAULT_GIT_DIR_ENVIRONMENT);
498	}
499
500	static void prepare_submodule_repo_env_in_gitdir(struct strvec *out)
501	{
502	prepare_other_repo_env(out, ".");
503	}
504
505	/*
506	* Initialize a repository struct for a submodule based on the provided 'path'.
507	*
508	* Returns the repository struct on success,
509	* NULL when the submodule is not present.
510	*/
511	static struct repository open_submodule(const char path)
512	{
513	struct strbuf sb = STRBUF_INIT;
514	struct repository out = xmalloc(sizeof(out));
515
516	if (submodule_to_gitdir(the_repository, &sb, path) \|\|
517	repo_init(out, sb.buf, NULL)) {
518	strbuf_release(&sb);
519	free(out);
520	return NULL;
521	}
522
523	/* Mark it as a submodule */
524	out->submodule_prefix = xstrdup(path);
525
526	strbuf_release(&sb);
527	return out;
528	}
529
530	/*
531	* Helper function to display the submodule header line prior to the full
532	* summary output.
533	*
534	* If it can locate the submodule git directory it will create a repository
535	* handle for the submodule and lookup both the left and right commits and
536	* put them into the left and right pointers.
537	*/
538	static void show_submodule_header(struct diff_options *o,
539	const char *path,
540	struct object_id one, struct object_id two,
541	unsigned dirty_submodule,
542	struct repository *sub,
543	struct commit left, struct commit right,
544	struct commit_list **merge_bases)
545	{
546	const char *message = NULL;
547	struct strbuf sb = STRBUF_INIT;
548	int fast_forward = 0, fast_backward = 0;
549
550	if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
551	diff_emit_submodule_untracked(o, path);
552
553	if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
554	diff_emit_submodule_modified(o, path);
555
556	if (is_null_oid(one))
557	message = "(new submodule)";
558	else if (is_null_oid(two))
559	message = "(submodule deleted)";
560
561	if (!sub) {
562	if (!message)
563	message = "(commits not present)";
564	goto output_header;
565	}
566
567	/*
568	* Attempt to lookup the commit references, and determine if this is
569	* a fast forward or fast backwards update.
570	*/
571	*left = lookup_commit_reference(sub, one);
572	*right = lookup_commit_reference(sub, two);
573
574	/*
575	* Warn about missing commits in the submodule project, but only if
576	* they aren't null.
577	*/
578	if ((!is_null_oid(one) && !*left) \|\|
579	(!is_null_oid(two) && !*right))
580	message = "(commits not present)";
581
582	*merge_bases = NULL;
583	if (repo_get_merge_bases(sub, left, right, merge_bases) < 0) {
584	message = "(corrupt repository)";
585	goto output_header;
586	}
587
588	if (*merge_bases) {
589	if ((merge_bases)->item == left)
590	fast_forward = 1;
591	else if ((merge_bases)->item == right)
592	fast_backward = 1;
593	}
594
595	if (oideq(one, two)) {
596	strbuf_release(&sb);
597	return;
598	}
599
600	output_header:
601	strbuf_addf(&sb, "Submodule %s ", path);
602	strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
603	strbuf_addstr(&sb, (fast_backward \|\| fast_forward) ? ".." : "...");
604	strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
605	if (message)
606	strbuf_addf(&sb, " %s\n", message);
607	else
608	strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
609	diff_emit_submodule_header(o, sb.buf);
610
611	strbuf_release(&sb);
612	}
613
614	void show_submodule_diff_summary(struct diff_options o, const char path,
615	struct object_id one, struct object_id two,
616	unsigned dirty_submodule)
617	{
618	struct rev_info rev = REV_INFO_INIT;
619	struct commit left = NULL, right = NULL;
620	struct commit_list *merge_bases = NULL;
621	struct repository *sub;
622
623	sub = open_submodule(path);
624	show_submodule_header(o, path, one, two, dirty_submodule,
625	sub, &left, &right, &merge_bases);
626
627	/*
628	* If we don't have both a left and a right pointer, there is no
629	* reason to try and display a summary. The header line should contain
630	* all the information the user needs.
631	*/
632	if (!left \|\| !right \|\| !sub)
633	goto out;
634
635	/* Treat revision walker failure the same as missing commits */
636	if (prepare_submodule_diff_summary(sub, &rev, path, left, right, merge_bases)) {
637	diff_emit_submodule_error(o, "(revision walker failed)\n");
638	goto out;
639	}
640
641	print_submodule_diff_summary(sub, &rev, o);
642
643	out:
644	commit_list_free(merge_bases);
645	release_revisions(&rev);
646	clear_commit_marks(left, ~0);
647	clear_commit_marks(right, ~0);
648	if (sub) {
649	repo_clear(sub);
650	free(sub);
651	}
652	}
653
654	void show_submodule_inline_diff(struct diff_options o, const char path,
655	struct object_id one, struct object_id two,
656	unsigned dirty_submodule)
657	{
658	const struct object_id old_oid = the_hash_algo->empty_tree, new_oid = the_hash_algo->empty_tree;
659	struct commit left = NULL, right = NULL;
660	struct commit_list *merge_bases = NULL;
661	struct child_process cp = CHILD_PROCESS_INIT;
662	struct strbuf sb = STRBUF_INIT;
663	struct repository *sub;
664
665	sub = open_submodule(path);
666	show_submodule_header(o, path, one, two, dirty_submodule,
667	sub, &left, &right, &merge_bases);
668
669	/* We need a valid left and right commit to display a difference */
670	if (!(left \|\| is_null_oid(one)) \|\|
671	!(right \|\| is_null_oid(two)))
672	goto done;
673
674	if (left)
675	old_oid = one;
676	if (right)
677	new_oid = two;
678
679	cp.git_cmd = 1;
680	cp.dir = path;
681	cp.out = -1;
682	cp.no_stdin = 1;
683
684	/* TODO: other options may need to be passed here. */
685	strvec_pushl(&cp.args, "diff", "--submodule=diff", NULL);
686	strvec_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
687	"always" : "never");
688
689	if (o->flags.reverse_diff) {
690	strvec_pushf(&cp.args, "--src-prefix=%s%s/",
691	o->b_prefix, path);
692	strvec_pushf(&cp.args, "--dst-prefix=%s%s/",
693	o->a_prefix, path);
694	} else {
695	strvec_pushf(&cp.args, "--src-prefix=%s%s/",
696	o->a_prefix, path);
697	strvec_pushf(&cp.args, "--dst-prefix=%s%s/",
698	o->b_prefix, path);
699	}
700	strvec_push(&cp.args, oid_to_hex(old_oid));
701	/*
702	* If the submodule has modified content, we will diff against the
703	* work tree, under the assumption that the user has asked for the
704	* diff format and wishes to actually see all differences even if they
705	* haven't yet been committed to the submodule yet.
706	*/
707	if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
708	strvec_push(&cp.args, oid_to_hex(new_oid));
709
710	prepare_submodule_repo_env(&cp.env);
711
712	if (!is_directory(path)) {
713	/* fall back to absorbed git dir, if any */
714	if (!sub)
715	goto done;
716	cp.dir = sub->gitdir;
717	strvec_push(&cp.env, GIT_DIR_ENVIRONMENT "=.");
718	strvec_push(&cp.env, GIT_WORK_TREE_ENVIRONMENT "=.");
719	}
720
721	if (start_command(&cp)) {
722	diff_emit_submodule_error(o, "(diff failed)\n");
723	goto done;
724	}
725
726	while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
727	diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
728
729	if (finish_command(&cp))
730	diff_emit_submodule_error(o, "(diff failed)\n");
731
732	done:
733	strbuf_release(&sb);
734	commit_list_free(merge_bases);
735	if (left)
736	clear_commit_marks(left, ~0);
737	if (right)
738	clear_commit_marks(right, ~0);
739	if (sub) {
740	repo_clear(sub);
741	free(sub);
742	}
743	}
744
745	int should_update_submodules(void)
746	{
747	return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
748	}
749
750	const struct submodule submodule_from_ce(const struct cache_entry ce)
751	{
752	if (!S_ISGITLINK(ce->ce_mode))
753	return NULL;
754
755	if (!should_update_submodules())
756	return NULL;
757
758	return submodule_from_path(the_repository, null_oid(the_hash_algo), ce->name);
759	}
760
761
762	struct collect_changed_submodules_cb_data {
763	struct repository *repo;
764	struct string_list *changed;
765	const struct object_id *commit_oid;
766	};
767
768	/*
769	* this would normally be two functions: default_name_from_path() and
770	* path_from_default_name(). Since the default name is the same as
771	* the submodule path we can get away with just one function which only
772	* checks whether there is a submodule in the working directory at that
773	* location.
774	*/
775	static const char default_name_or_path(const char path_or_name)
776	{
777	int error_code;
778
779	if (!is_submodule_populated_gently(path_or_name, &error_code))
780	return NULL;
781
782	return path_or_name;
783	}
784
785	/*
786	* Holds relevant information for a changed submodule. Used as the .util
787	* member of the changed submodule name string_list_item.
788	*
789	* (super_oid, path) allows the submodule config to be read from _some_
790	* .gitmodules file. We store this information the first time we find a
791	* superproject commit that points to the submodule, but this is
792	* arbitrary - we can choose any (super_oid, path) that matches the
793	* submodule's name.
794	*
795	* NEEDSWORK: Storing an arbitrary commit is undesirable because we can't
796	* guarantee that we're reading the commit that the user would expect. A better
797	* scheme would be to just fetch a submodule by its name. This requires two
798	* steps:
799	* - Create a function that behaves like repo_submodule_init(), but accepts a
800	* submodule name instead of treeish_name and path. This should be easy
801	* because repo_submodule_init() internally uses the submodule's name.
802	*
803	* - Replace most instances of 'struct submodule' (which is the .gitmodules
804	* config) with just the submodule name. This is OK because we expect
805	* submodule settings to be stored in .git/config (via "git submodule init"),
806	* not .gitmodules. This also lets us delete get_non_gitmodules_submodule(),
807	* which constructs a bogus 'struct submodule' for the sake of giving a
808	* placeholder name to a gitlink.
809	*/
810	struct changed_submodule_data {
811	/*
812	* The first superproject commit in the rev walk that points to
813	* the submodule.
814	*/
815	const struct object_id *super_oid;
816	/*
817	* Path to the submodule in the superproject commit referenced
818	* by 'super_oid'.
819	*/
820	char *path;
821	/* The submodule commits that have changed in the rev walk. */
822	struct oid_array new_commits;
823	};
824
825	static void changed_submodule_data_clear(struct changed_submodule_data *cs_data)
826	{
827	oid_array_clear(&cs_data->new_commits);
828	free(cs_data->path);
829	}
830
831	static void collect_changed_submodules_cb(struct diff_queue_struct *q,
832	struct diff_options *options UNUSED,
833	void *data)
834	{
835	struct collect_changed_submodules_cb_data *me = data;
836	struct string_list *changed = me->changed;
837	const struct object_id *commit_oid = me->commit_oid;
838	int i;
839
840	for (i = 0; i < q->nr; i++) {
841	struct diff_filepair *p = q->queue[i];
842	const struct submodule *submodule;
843	const char *name;
844	struct string_list_item *item;
845	struct changed_submodule_data *cs_data;
846
847	if (!S_ISGITLINK(p->two->mode))
848	continue;
849
850	submodule = submodule_from_path(me->repo,
851	commit_oid, p->two->path);
852	if (submodule)
853	name = submodule->name;
854	else {
855	name = default_name_or_path(p->two->path);
856	/* make sure name does not collide with existing one */
857	if (name)
858	submodule = submodule_from_name(me->repo,
859	commit_oid, name);
860	if (submodule) {
861	warning(_("Submodule in commit %s at path: "
862	"'%s' collides with a submodule named "
863	"the same. Skipping it."),
864	oid_to_hex(commit_oid), p->two->path);
865	name = NULL;
866	}
867	}
868
869	if (!name)
870	continue;
871
872	item = string_list_insert(changed, name);
873	if (item->util)
874	cs_data = item->util;
875	else {
876	item->util = xcalloc(1, sizeof(struct changed_submodule_data));
877	cs_data = item->util;
878	cs_data->super_oid = commit_oid;
879	cs_data->path = xstrdup(p->two->path);
880	}
881	oid_array_append(&cs_data->new_commits, &p->two->oid);
882	}
883	}
884
885	/*
886	* Collect the paths of submodules in 'changed' which have changed based on
887	* the revisions as specified in 'argv'. Each entry in 'changed' will also
888	* have a corresponding 'struct oid_array' (in the 'util' field) which lists
889	* what the submodule pointers were updated to during the change.
890	*/
891	static void collect_changed_submodules(struct repository *r,
892	struct string_list *changed,
893	struct strvec *argv)
894	{
895	struct rev_info rev;
896	const struct commit *commit;
897	int save_warning;
898	struct setup_revision_opt s_r_opt = {
899	.assume_dashdash = 1,
900	};
901	struct repo_config_values *cfg = repo_config_values(the_repository);
902
903	save_warning = cfg->warn_on_object_refname_ambiguity;
904	cfg->warn_on_object_refname_ambiguity = 0;
905	repo_init_revisions(r, &rev, NULL);
906	setup_revisions_from_strvec(argv, &rev, &s_r_opt);
907	cfg->warn_on_object_refname_ambiguity = save_warning;
908	if (prepare_revision_walk(&rev))
909	die(_("revision walk setup failed"));
910
911	while ((commit = get_revision(&rev))) {
912	struct rev_info diff_rev;
913	struct collect_changed_submodules_cb_data data;
914	data.repo = r;
915	data.changed = changed;
916	data.commit_oid = &commit->object.oid;
917
918	repo_init_revisions(r, &diff_rev, NULL);
919	diff_rev.diffopt.output_format \|= DIFF_FORMAT_CALLBACK;
920	diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
921	diff_rev.diffopt.format_callback_data = &data;
922	diff_rev.dense_combined_merges = 1;
923	diff_tree_combined_merge(commit, &diff_rev);
924	release_revisions(&diff_rev);
925	}
926
927	reset_revision_walk();
928	release_revisions(&rev);
929	}
930
931	static void free_submodules_data(struct string_list *submodules)
932	{
933	struct string_list_item *item;
934	for_each_string_list_item(item, submodules)
935	changed_submodule_data_clear(item->util);
936
937	string_list_clear(submodules, 1);
938	}
939
940	static int has_remote(const struct reference ref UNUSED, void cb_data UNUSED)
941	{
942	return 1;
943	}
944
945	static int append_oid_to_argv(const struct object_id oid, void data)
946	{
947	struct strvec *argv = data;
948	strvec_push(argv, oid_to_hex(oid));
949	return 0;
950	}
951
952	struct has_commit_data {
953	struct repository *repo;
954	int result;
955	const char *path;
956	const struct object_id *super_oid;
957	};
958
959	static int check_has_commit(const struct object_id oid, void data)
960	{
961	struct has_commit_data *cb = data;
962	struct repository subrepo;
963	enum object_type type;
964
965	if (repo_submodule_init(&subrepo, cb->repo, cb->path, cb->super_oid)) {
966	cb->result = 0;
967	/* subrepo failed to init, so don't clean it up. */
968	return 0;
969	}
970
971	type = odb_read_object_info(subrepo.objects, oid, NULL);
972
973	switch (type) {
974	case OBJ_COMMIT:
975	goto cleanup;
976	case OBJ_BAD:
977	/*
978	* Object is missing or invalid. If invalid, an error message
979	* has already been printed.
980	*/
981	cb->result = 0;
982	goto cleanup;
983	default:
984	die(_("submodule entry '%s' (%s) is a %s, not a commit"),
985	cb->path, oid_to_hex(oid), type_name(type));
986	}
987	cleanup:
988	repo_clear(&subrepo);
989	return 0;
990	}
991
992	static int submodule_has_commits(struct repository *r,
993	const char *path,
994	const struct object_id *super_oid,
995	struct oid_array *commits)
996	{
997	struct has_commit_data has_commit = {
998	.repo = r,
999	.result = 1,
1000	.path = path,
1001	.super_oid = super_oid
1002	};
1003
1004	if (validate_submodule_path(path) < 0)
1005	exit(128);
1006
1007	oid_array_for_each_unique(commits, check_has_commit, &has_commit);
1008
1009	if (has_commit.result) {
1010	/*
1011	* Even if the submodule is checked out and the commit is
1012	* present, make sure it exists in the submodule's object store
1013	* and that it is reachable from a ref.
1014	*/
1015	struct child_process cp = CHILD_PROCESS_INIT;
1016	struct strbuf out = STRBUF_INIT;
1017
1018	strvec_pushl(&cp.args, "rev-list", "-n", "1", NULL);
1019	oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
1020	strvec_pushl(&cp.args, "--not", "--all", NULL);
1021
1022	prepare_submodule_repo_env(&cp.env);
1023	cp.git_cmd = 1;
1024	cp.no_stdin = 1;
1025	cp.dir = path;
1026
1027	if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) \|\| out.len)
1028	has_commit.result = 0;
1029
1030	strbuf_release(&out);
1031	}
1032
1033	return has_commit.result;
1034	}
1035
1036	static int submodule_needs_pushing(struct repository *r,
1037	const char *path,
1038	struct oid_array *commits)
1039	{
1040	if (!submodule_has_commits(r, path, null_oid(the_hash_algo), commits))
1041	/*
1042	* NOTE: We do consider it safe to return "no" here. The
1043	* correct answer would be "We do not know" instead of
1044	* "No push needed", but it is quite hard to change
1045	* the submodule pointer without having the submodule
1046	* around. If a user did however change the submodules
1047	* without having the submodule around, this indicates
1048	* an expert who knows what they are doing or a
1049	* maintainer integrating work from other people. In
1050	* both cases it should be safe to skip this check.
1051	*/
1052	return 0;
1053
1054	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
1055	struct child_process cp = CHILD_PROCESS_INIT;
1056	struct strbuf buf = STRBUF_INIT;
1057	int needs_pushing = 0;
1058
1059	strvec_push(&cp.args, "rev-list");
1060	oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
1061	strvec_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
1062
1063	prepare_submodule_repo_env(&cp.env);
1064	cp.git_cmd = 1;
1065	cp.no_stdin = 1;
1066	cp.out = -1;
1067	cp.dir = path;
1068	if (start_command(&cp))
1069	die(_("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s"),
1070	path);
1071	if (strbuf_read(&buf, cp.out, the_hash_algo->hexsz + 1))
1072	needs_pushing = 1;
1073	finish_command(&cp);
1074	close(cp.out);
1075	strbuf_release(&buf);
1076	return needs_pushing;
1077	}
1078
1079	return 0;
1080	}
1081
1082	int find_unpushed_submodules(struct repository *r,
1083	struct oid_array *commits,
1084	const char *remotes_name,
1085	struct string_list *needs_pushing)
1086	{
1087	struct string_list submodules = STRING_LIST_INIT_DUP;
1088	struct string_list_item *name;
1089	struct strvec argv = STRVEC_INIT;
1090
1091	/* argv.v[0] will be ignored by setup_revisions */
1092	strvec_push(&argv, "find_unpushed_submodules");
1093	oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
1094	strvec_push(&argv, "--not");
1095	strvec_pushf(&argv, "--remotes=%s", remotes_name);
1096
1097	collect_changed_submodules(r, &submodules, &argv);
1098
1099	for_each_string_list_item(name, &submodules) {
1100	struct changed_submodule_data *cs_data = name->util;
1101	const struct submodule *submodule;
1102	const char *path = NULL;
1103
1104	submodule = submodule_from_name(r, null_oid(the_hash_algo), name->string);
1105	if (submodule)
1106	path = submodule->path;
1107	else
1108	path = default_name_or_path(name->string);
1109
1110	if (!path)
1111	continue;
1112
1113	if (submodule_needs_pushing(r, path, &cs_data->new_commits))
1114	string_list_insert(needs_pushing, path);
1115	}
1116
1117	free_submodules_data(&submodules);
1118	strvec_clear(&argv);
1119
1120	return needs_pushing->nr;
1121	}
1122
1123	static int push_submodule(const char *path,
1124	const struct remote *remote,
1125	const struct refspec *rs,
1126	const struct string_list *push_options,
1127	int dry_run)
1128	{
1129	if (validate_submodule_path(path) < 0)
1130	exit(128);
1131
1132	if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
1133	struct child_process cp = CHILD_PROCESS_INIT;
1134	strvec_push(&cp.args, "push");
1135	/*
1136	* When recursing into a submodule, treat any "only" configurations as "on-
1137	* demand", since "only" would not work (we need all submodules to be pushed
1138	* in order to be able to push the superproject).
1139	*/
1140	strvec_push(&cp.args, "--recurse-submodules=only-is-on-demand");
1141	if (dry_run)
1142	strvec_push(&cp.args, "--dry-run");
1143
1144	if (push_options && push_options->nr) {
1145	const struct string_list_item *item;
1146	for_each_string_list_item(item, push_options)
1147	strvec_pushf(&cp.args, "--push-option=%s",
1148	item->string);
1149	}
1150
1151	if (remote->origin != REMOTE_UNCONFIGURED) {
1152	int i;
1153	strvec_push(&cp.args, remote->name);
1154	for (i = 0; i < rs->nr; i++)
1155	strvec_push(&cp.args, rs->items[i].raw);
1156	}
1157
1158	prepare_submodule_repo_env(&cp.env);
1159	cp.git_cmd = 1;
1160	cp.no_stdin = 1;
1161	cp.dir = path;
1162	if (run_command(&cp))
1163	return 0;
1164	close(cp.out);
1165	}
1166
1167	return 1;
1168	}
1169
1170	/*
1171	* Perform a check in the submodule to see if the remote and refspec work.
1172	* Die if the submodule can't be pushed.
1173	*/
1174	static void submodule_push_check(const char path, const char head,
1175	const struct remote *remote,
1176	const struct refspec *rs)
1177	{
1178	struct child_process cp = CHILD_PROCESS_INIT;
1179	int i;
1180
1181	if (validate_submodule_path(path) < 0)
1182	exit(128);
1183
1184	strvec_push(&cp.args, "submodule--helper");
1185	strvec_push(&cp.args, "push-check");
1186	strvec_push(&cp.args, head);
1187	strvec_push(&cp.args, remote->name);
1188
1189	for (i = 0; i < rs->nr; i++)
1190	strvec_push(&cp.args, rs->items[i].raw);
1191
1192	prepare_submodule_repo_env(&cp.env);
1193	cp.git_cmd = 1;
1194	cp.no_stdin = 1;
1195	cp.no_stdout = 1;
1196	cp.dir = path;
1197
1198	/*
1199	* Simply indicate if 'submodule--helper push-check' failed.
1200	* More detailed error information will be provided by the
1201	* child process.
1202	*/
1203	if (run_command(&cp))
1204	die(_("process for submodule '%s' failed"), path);
1205	}
1206
1207	int push_unpushed_submodules(struct repository *r,
1208	struct oid_array *commits,
1209	const struct remote *remote,
1210	const struct refspec *rs,
1211	const struct string_list *push_options,
1212	int dry_run)
1213	{
1214	int i, ret = 1;
1215	struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1216
1217	if (!find_unpushed_submodules(r, commits,
1218	remote->name, &needs_pushing))
1219	return 1;
1220
1221	/*
1222	* Verify that the remote and refspec can be propagated to all
1223	* submodules. This check can be skipped if the remote and refspec
1224	* won't be propagated due to the remote being unconfigured (e.g. a URL
1225	* instead of a remote name).
1226	*/
1227	if (remote->origin != REMOTE_UNCONFIGURED) {
1228	char *head;
1229	struct object_id head_oid;
1230
1231	head = refs_resolve_refdup(get_main_ref_store(the_repository),
1232	"HEAD", 0, &head_oid, NULL);
1233	if (!head)
1234	die(_("Failed to resolve HEAD as a valid ref."));
1235
1236	for (i = 0; i < needs_pushing.nr; i++)
1237	submodule_push_check(needs_pushing.items[i].string,
1238	head, remote, rs);
1239	free(head);
1240	}
1241
1242	/* Actually push the submodules */
1243	for (i = 0; i < needs_pushing.nr; i++) {
1244	const char *path = needs_pushing.items[i].string;
1245	fprintf(stderr, _("Pushing submodule '%s'\n"), path);
1246	if (!push_submodule(path, remote, rs,
1247	push_options, dry_run)) {
1248	fprintf(stderr, _("Unable to push submodule '%s'\n"), path);
1249	ret = 0;
1250	}
1251	}
1252
1253	string_list_clear(&needs_pushing, 0);
1254
1255	return ret;
1256	}
1257
1258	static int append_oid_to_array(const struct reference ref, void data)
1259	{
1260	struct oid_array *array = data;
1261	oid_array_append(array, ref->oid);
1262	return 0;
1263	}
1264
1265	void check_for_new_submodule_commits(struct object_id *oid)
1266	{
1267	if (!initialized_fetch_ref_tips) {
1268	refs_for_each_ref(get_main_ref_store(the_repository),
1269	append_oid_to_array, &ref_tips_before_fetch);
1270	initialized_fetch_ref_tips = 1;
1271	}
1272
1273	oid_array_append(&ref_tips_after_fetch, oid);
1274	}
1275
1276	/*
1277	* Returns 1 if there is at least one submodule gitdir in
1278	* $GIT_DIR/modules and 0 otherwise. This follows
1279	* submodule_name_to_gitdir(), which looks for submodules in
1280	* $GIT_DIR/modules, not $GIT_COMMON_DIR.
1281	*
1282	* A submodule can be moved to $GIT_DIR/modules manually by running "git
1283	* submodule absorbgitdirs", or it may be initialized there by "git
1284	* submodule update".
1285	*/
1286	static int repo_has_absorbed_submodules(struct repository *r)
1287	{
1288	int ret;
1289	struct strbuf buf = STRBUF_INIT;
1290
1291	repo_git_path_append(r, &buf, "modules/");
1292	ret = file_exists(buf.buf) && !is_empty_dir(buf.buf);
1293	strbuf_release(&buf);
1294	return ret;
1295	}
1296
1297	static void calculate_changed_submodule_paths(struct repository *r,
1298	struct string_list *changed_submodule_names)
1299	{
1300	struct strvec argv = STRVEC_INIT;
1301	struct string_list_item *name;
1302
1303	/* No need to check if no submodules would be fetched */
1304	if (!submodule_from_path(r, NULL, NULL) &&
1305	!repo_has_absorbed_submodules(r))
1306	return;
1307
1308	strvec_push(&argv, "--"); /* argv[0] program name */
1309	oid_array_for_each_unique(&ref_tips_after_fetch,
1310	append_oid_to_argv, &argv);
1311	strvec_push(&argv, "--not");
1312	oid_array_for_each_unique(&ref_tips_before_fetch,
1313	append_oid_to_argv, &argv);
1314
1315	/*
1316	* Collect all submodules (whether checked out or not) for which new
1317	* commits have been recorded upstream in "changed_submodule_names".
1318	*/
1319	collect_changed_submodules(r, changed_submodule_names, &argv);
1320
1321	for_each_string_list_item(name, changed_submodule_names) {
1322	struct changed_submodule_data *cs_data = name->util;
1323	const struct submodule *submodule;
1324	const char *path = NULL;
1325
1326	submodule = submodule_from_name(r, null_oid(the_hash_algo), name->string);
1327	if (submodule)
1328	path = submodule->path;
1329	else
1330	path = default_name_or_path(name->string);
1331
1332	if (!path)
1333	continue;
1334
1335	if (submodule_has_commits(r, path, null_oid(the_hash_algo), &cs_data->new_commits)) {
1336	changed_submodule_data_clear(cs_data);
1337	*name->string = '\0';
1338	}
1339	}
1340
1341	string_list_remove_empty_items(changed_submodule_names, 1);
1342
1343	strvec_clear(&argv);
1344	oid_array_clear(&ref_tips_before_fetch);
1345	oid_array_clear(&ref_tips_after_fetch);
1346	initialized_fetch_ref_tips = 0;
1347	}
1348
1349	int submodule_touches_in_range(struct repository *r,
1350	struct object_id *excl_oid,
1351	struct object_id *incl_oid)
1352	{
1353	struct string_list subs = STRING_LIST_INIT_DUP;
1354	struct strvec args = STRVEC_INIT;
1355	int ret;
1356
1357	/* No need to check if there are no submodules configured */
1358	if (!submodule_from_path(r, NULL, NULL))
1359	return 0;
1360
1361	strvec_push(&args, "--"); /* args[0] program name */
1362	strvec_push(&args, oid_to_hex(incl_oid));
1363	if (!is_null_oid(excl_oid)) {
1364	strvec_push(&args, "--not");
1365	strvec_push(&args, oid_to_hex(excl_oid));
1366	}
1367
1368	collect_changed_submodules(r, &subs, &args);
1369	ret = subs.nr;
1370
1371	strvec_clear(&args);
1372
1373	free_submodules_data(&subs);
1374	return ret;
1375	}
1376
1377	struct submodule_parallel_fetch {
1378	/*
1379	* The index of the last index entry processed by
1380	* get_fetch_task_from_index().
1381	*/
1382	int index_count;
1383	/*
1384	* The index of the last string_list entry processed by
1385	* get_fetch_task_from_changed().
1386	*/
1387	int changed_count;
1388	struct strvec args;
1389	struct repository *r;
1390	const char *prefix;
1391	int command_line_option;
1392	int default_option;
1393	int quiet;
1394	int result;
1395
1396	/*
1397	* Names of submodules that have new commits. Generated by
1398	* walking the newly fetched superproject commits.
1399	*/
1400	struct string_list changed_submodule_names;
1401	/*
1402	* Names of submodules that have already been processed. Lets us
1403	* avoid fetching the same submodule more than once.
1404	*/
1405	struct string_list seen_submodule_names;
1406
1407	/* Pending fetches by OIDs */
1408	struct fetch_task **oid_fetch_tasks;
1409	int oid_fetch_tasks_nr, oid_fetch_tasks_alloc;
1410
1411	struct strbuf submodules_with_errors;
1412	};
1413	#define SPF_INIT { \
1414	.args = STRVEC_INIT, \
1415	.changed_submodule_names = STRING_LIST_INIT_DUP, \
1416	.seen_submodule_names = STRING_LIST_INIT_DUP, \
1417	.submodules_with_errors = STRBUF_INIT, \
1418	}
1419
1420	static int get_fetch_recurse_config(const struct submodule *submodule,
1421	struct submodule_parallel_fetch *spf)
1422	{
1423	if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
1424	return spf->command_line_option;
1425
1426	if (submodule) {
1427	char *key;
1428	const char *value;
1429
1430	int fetch_recurse = submodule->fetch_recurse;
1431	key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
1432	if (!repo_config_get_string_tmp(spf->r, key, &value)) {
1433	fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
1434	}
1435	free(key);
1436
1437	if (fetch_recurse != RECURSE_SUBMODULES_NONE)
1438	/* local config overrules everything except commandline */
1439	return fetch_recurse;
1440	}
1441
1442	return spf->default_option;
1443	}
1444
1445	/*
1446	* Fetch in progress (if callback data) or
1447	* pending (if in oid_fetch_tasks in struct submodule_parallel_fetch)
1448	*/
1449	struct fetch_task {
1450	struct repository *repo;
1451	const struct submodule *sub;
1452	unsigned free_sub : 1; /* Do we need to free the submodule? */
1453	const char default_argv; / The default fetch mode. */
1454	struct strvec git_args; /* Args for the child git process. */
1455
1456	struct oid_array commits; / Ensure these commits are fetched */
1457	};
1458
1459	/**
1460	* When a submodule is not defined in .gitmodules, we cannot access it
1461	* via the regular submodule-config. Create a fake submodule, which we can
1462	* work on.
1463	*/
1464	static const struct submodule get_non_gitmodules_submodule(const char path)
1465	{
1466	struct submodule *ret;
1467	const char *name = default_name_or_path(path);
1468
1469	if (!name)
1470	return NULL;
1471
1472	CALLOC_ARRAY(ret, 1);
1473	ret->path = name;
1474	ret->name = name;
1475
1476	return (const struct submodule *) ret;
1477	}
1478
1479	static void fetch_task_free(struct fetch_task *p)
1480	{
1481	if (p->free_sub)
1482	free((void*)p->sub);
1483	p->free_sub = 0;
1484	p->sub = NULL;
1485
1486	if (p->repo)
1487	repo_clear(p->repo);
1488	FREE_AND_NULL(p->repo);
1489
1490	strvec_clear(&p->git_args);
1491	free(p);
1492	}
1493
1494	static struct repository get_submodule_repo_for(struct repository r,
1495	const char *path,
1496	const struct object_id *treeish_name)
1497	{
1498	struct repository ret = xmalloc(sizeof(ret));
1499
1500	if (repo_submodule_init(ret, r, path, treeish_name)) {
1501	free(ret);
1502	return NULL;
1503	}
1504
1505	return ret;
1506	}
1507
1508	static struct fetch_task fetch_task_create(struct submodule_parallel_fetch spf,
1509	const char *path,
1510	const struct object_id *treeish_name)
1511	{
1512	struct fetch_task *task;
1513
1514	CALLOC_ARRAY(task, 1);
1515
1516	if (validate_submodule_path(path) < 0)
1517	exit(128);
1518
1519	task->sub = submodule_from_path(spf->r, treeish_name, path);
1520
1521	if (!task->sub) {
1522	/*
1523	* No entry in .gitmodules? Technically not a submodule,
1524	* but historically we supported repositories that happen to be
1525	* in-place where a gitlink is. Keep supporting them.
1526	*/
1527	task->sub = get_non_gitmodules_submodule(path);
1528	if (!task->sub)
1529	goto cleanup;
1530
1531	task->free_sub = 1;
1532	}
1533
1534	if (string_list_lookup(&spf->seen_submodule_names, task->sub->name))
1535	goto cleanup;
1536
1537	switch (get_fetch_recurse_config(task->sub, spf))
1538	{
1539	default:
1540	case RECURSE_SUBMODULES_DEFAULT:
1541	case RECURSE_SUBMODULES_ON_DEMAND:
1542	if (!task->sub \|\|
1543	!string_list_lookup(
1544	&spf->changed_submodule_names,
1545	task->sub->name))
1546	goto cleanup;
1547	task->default_argv = "on-demand";
1548	break;
1549	case RECURSE_SUBMODULES_ON:
1550	task->default_argv = "yes";
1551	break;
1552	case RECURSE_SUBMODULES_OFF:
1553	goto cleanup;
1554	}
1555
1556	task->repo = get_submodule_repo_for(spf->r, path, treeish_name);
1557
1558	return task;
1559
1560	cleanup:
1561	fetch_task_free(task);
1562	return NULL;
1563	}
1564
1565	static struct fetch_task *
1566	get_fetch_task_from_index(struct submodule_parallel_fetch *spf,
1567	struct strbuf *err)
1568	{
1569	for (; spf->index_count < spf->r->index->cache_nr; spf->index_count++) {
1570	const struct cache_entry *ce =
1571	spf->r->index->cache[spf->index_count];
1572	struct fetch_task *task;
1573
1574	if (!S_ISGITLINK(ce->ce_mode))
1575	continue;
1576
1577	task = fetch_task_create(spf, ce->name, null_oid(the_hash_algo));
1578	if (!task)
1579	continue;
1580
1581	if (task->repo) {
1582	if (!spf->quiet)
1583	strbuf_addf(err, _("Fetching submodule %s%s\n"),
1584	spf->prefix, ce->name);
1585
1586	spf->index_count++;
1587	return task;
1588	} else {
1589	struct strbuf empty_submodule_path = STRBUF_INIT;
1590
1591	fetch_task_free(task);
1592
1593	/*
1594	* An empty directory is normal,
1595	* the submodule is not initialized
1596	*/
1597	strbuf_addf(&empty_submodule_path, "%s/%s/",
1598	spf->r->worktree,
1599	ce->name);
1600	if (S_ISGITLINK(ce->ce_mode) &&
1601	!is_empty_dir(empty_submodule_path.buf)) {
1602	spf->result = 1;
1603	strbuf_addf(err,
1604	_("Could not access submodule '%s'\n"),
1605	ce->name);
1606	}
1607	strbuf_release(&empty_submodule_path);
1608	}
1609	}
1610	return NULL;
1611	}
1612
1613	static struct fetch_task *
1614	get_fetch_task_from_changed(struct submodule_parallel_fetch *spf,
1615	struct strbuf *err)
1616	{
1617	for (; spf->changed_count < spf->changed_submodule_names.nr;
1618	spf->changed_count++) {
1619	struct string_list_item item =
1620	spf->changed_submodule_names.items[spf->changed_count];
1621	struct changed_submodule_data *cs_data = item.util;
1622	struct fetch_task *task;
1623
1624	if (!is_tree_submodule_active(spf->r, cs_data->super_oid,cs_data->path))
1625	continue;
1626
1627	task = fetch_task_create(spf, cs_data->path,
1628	cs_data->super_oid);
1629	if (!task)
1630	continue;
1631
1632	if (!task->repo) {
1633	strbuf_addf(err, _("Could not access submodule '%s' at commit %s\n"),
1634	cs_data->path,
1635	repo_find_unique_abbrev(the_repository, cs_data->super_oid, DEFAULT_ABBREV));
1636
1637	fetch_task_free(task);
1638	continue;
1639	}
1640
1641	if (!spf->quiet)
1642	strbuf_addf(err,
1643	_("Fetching submodule %s%s at commit %s\n"),
1644	spf->prefix, task->sub->path,
1645	repo_find_unique_abbrev(the_repository, cs_data->super_oid,
1646	DEFAULT_ABBREV));
1647
1648	spf->changed_count++;
1649	/*
1650	* NEEDSWORK: Submodules set/unset a value for
1651	* core.worktree when they are populated/unpopulated by
1652	* "git checkout" (and similar commands, see
1653	* submodule_move_head() and
1654	* connect_work_tree_and_git_dir()), but if the
1655	* submodule is unpopulated in another way (e.g. "git
1656	* rm", "rm -r"), core.worktree will still be set even
1657	* though the directory doesn't exist, and the child
1658	* process will crash while trying to chdir into the
1659	* nonexistent directory.
1660	*
1661	* In this case, we know that the submodule has no
1662	* working tree, so we can work around this by
1663	* setting "--work-tree=." (--bare does not work because
1664	* worktree settings take precedence over bare-ness).
1665	* However, this is not necessarily true in other cases,
1666	* so a generalized solution is still necessary.
1667	*
1668	* Possible solutions:
1669	* - teach "git [add\|rm]" to unset core.worktree and
1670	* discourage users from removing submodules without
1671	* using a Git command.
1672	* - teach submodule child processes to ignore stale
1673	* core.worktree values.
1674	*/
1675	strvec_push(&task->git_args, "--work-tree=.");
1676	return task;
1677	}
1678	return NULL;
1679	}
1680
1681	static int get_next_submodule(struct child_process cp, struct strbuf err,
1682	void data, void *task_cb)
1683	{
1684	struct submodule_parallel_fetch *spf = data;
1685	struct fetch_task *task =
1686	get_fetch_task_from_index(spf, err);
1687	if (!task)
1688	task = get_fetch_task_from_changed(spf, err);
1689
1690	if (task) {
1691	child_process_init(cp);
1692	cp->dir = task->repo->gitdir;
1693	prepare_submodule_repo_env_in_gitdir(&cp->env);
1694	cp->git_cmd = 1;
1695	strvec_init(&cp->args);
1696	if (task->git_args.nr)
1697	strvec_pushv(&cp->args, task->git_args.v);
1698	strvec_pushv(&cp->args, spf->args.v);
1699	strvec_push(&cp->args, task->default_argv);
1700	strvec_pushf(&cp->args, "--submodule-prefix=%s%s/",
1701	spf->prefix, task->sub->path);
1702
1703	*task_cb = task;
1704
1705	string_list_insert(&spf->seen_submodule_names, task->sub->name);
1706	return 1;
1707	}
1708
1709	if (spf->oid_fetch_tasks_nr) {
1710	struct fetch_task *task =
1711	spf->oid_fetch_tasks[spf->oid_fetch_tasks_nr - 1];
1712	struct child_process cp_remote = CHILD_PROCESS_INIT;
1713	struct strbuf remote_name = STRBUF_INIT;
1714	spf->oid_fetch_tasks_nr--;
1715
1716	child_process_init(cp);
1717	prepare_submodule_repo_env_in_gitdir(&cp->env);
1718	cp->git_cmd = 1;
1719	cp->dir = task->repo->gitdir;
1720
1721	strvec_init(&cp->args);
1722	strvec_pushv(&cp->args, spf->args.v);
1723	strvec_push(&cp->args, "on-demand");
1724	strvec_pushf(&cp->args, "--submodule-prefix=%s%s/",
1725	spf->prefix, task->sub->path);
1726
1727	cp_remote.git_cmd = 1;
1728	strvec_pushl(&cp_remote.args, "submodule--helper",
1729	"get-default-remote", task->sub->path, NULL);
1730
1731	if (!capture_command(&cp_remote, &remote_name, 0)) {
1732	strbuf_trim_trailing_newline(&remote_name);
1733	strvec_push(&cp->args, remote_name.buf);
1734	} else {
1735	/* Fallback to "origin" if the helper fails */
1736	strvec_push(&cp->args, "origin");
1737	}
1738	strbuf_release(&remote_name);
1739
1740	oid_array_for_each_unique(task->commits,
1741	append_oid_to_argv, &cp->args);
1742
1743	*task_cb = task;
1744	return 1;
1745	}
1746
1747	return 0;
1748	}
1749
1750	static int fetch_start_failure(struct strbuf *err UNUSED,
1751	void cb, void task_cb)
1752	{
1753	struct submodule_parallel_fetch *spf = cb;
1754	struct fetch_task *task = task_cb;
1755
1756	spf->result = 1;
1757
1758	fetch_task_free(task);
1759	return 0;
1760	}
1761
1762	static int commit_missing_in_sub(const struct object_id oid, void data)
1763	{
1764	struct repository *subrepo = data;
1765	enum object_type type = odb_read_object_info(subrepo->objects, oid, NULL);
1766
1767	return type != OBJ_COMMIT;
1768	}
1769
1770	static int fetch_finish(int retvalue, struct strbuf *err UNUSED,
1771	void cb, void task_cb)
1772	{
1773	struct submodule_parallel_fetch *spf = cb;
1774	struct fetch_task *task = task_cb;
1775
1776	struct string_list_item *it;
1777	struct changed_submodule_data *cs_data;
1778
1779	if (!task \|\| !task->sub)
1780	BUG("callback cookie bogus");
1781
1782	if (retvalue) {
1783	/*
1784	* NEEDSWORK: This indicates that the overall fetch
1785	* failed, even though there may be a subsequent fetch
1786	* by commit hash that might work. It may be a good
1787	* idea to not indicate failure in this case, and only
1788	* indicate failure if the subsequent fetch fails.
1789	*/
1790	spf->result = 1;
1791
1792	strbuf_addf(&spf->submodules_with_errors, "\t%s\n",
1793	task->sub->name);
1794	}
1795
1796	/* Is this the second time we process this submodule? */
1797	if (task->commits)
1798	goto out;
1799
1800	it = string_list_lookup(&spf->changed_submodule_names, task->sub->name);
1801	if (!it)
1802	/* Could be an unchanged submodule, not contained in the list */
1803	goto out;
1804
1805	cs_data = it->util;
1806	oid_array_filter(&cs_data->new_commits,
1807	commit_missing_in_sub,
1808	task->repo);
1809
1810	/* Are there commits we want, but do not exist? */
1811	if (cs_data->new_commits.nr) {
1812	task->commits = &cs_data->new_commits;
1813	ALLOC_GROW(spf->oid_fetch_tasks,
1814	spf->oid_fetch_tasks_nr + 1,
1815	spf->oid_fetch_tasks_alloc);
1816	spf->oid_fetch_tasks[spf->oid_fetch_tasks_nr] = task;
1817	spf->oid_fetch_tasks_nr++;
1818	return 0;
1819	}
1820
1821	out:
1822	fetch_task_free(task);
1823	return 0;
1824	}
1825
1826	int fetch_submodules(struct repository *r,
1827	const struct strvec *options,
1828	const char *prefix, int command_line_option,
1829	int default_option,
1830	int quiet, int max_parallel_jobs)
1831	{
1832	struct submodule_parallel_fetch spf = SPF_INIT;
1833	const struct run_process_parallel_opts opts = {
1834	.tr2_category = "submodule",
1835	.tr2_label = "parallel/fetch",
1836
1837	.processes = max_parallel_jobs,
1838
1839	.get_next_task = get_next_submodule,
1840	.start_failure = fetch_start_failure,
1841	.task_finished = fetch_finish,
1842	.data = &spf,
1843	};
1844
1845	spf.r = r;
1846	spf.command_line_option = command_line_option;
1847	spf.default_option = default_option;
1848	spf.quiet = quiet;
1849	spf.prefix = prefix;
1850
1851	if (!r->worktree)
1852	goto out;
1853
1854	if (repo_read_index(r) < 0)
1855	die(_("index file corrupt"));
1856
1857	strvec_push(&spf.args, "fetch");
1858	strvec_pushv(&spf.args, options->v);
1859	strvec_push(&spf.args, "--recurse-submodules-default");
1860	/* default value, "--submodule-prefix" and its value are added later */
1861
1862	calculate_changed_submodule_paths(r, &spf.changed_submodule_names);
1863	string_list_sort(&spf.changed_submodule_names);
1864	run_processes_parallel(&opts);
1865
1866	if (spf.submodules_with_errors.len > 0)
1867	fprintf(stderr, _("Errors during submodule fetch:\n%s"),
1868	spf.submodules_with_errors.buf);
1869
1870
1871	strvec_clear(&spf.args);
1872	out:
1873	free_submodules_data(&spf.changed_submodule_names);
1874	string_list_clear(&spf.seen_submodule_names, 0);
1875	strbuf_release(&spf.submodules_with_errors);
1876	free(spf.oid_fetch_tasks);
1877	return spf.result;
1878	}
1879
1880	unsigned is_submodule_modified(const char *path, int ignore_untracked)
1881	{
1882	struct child_process cp = CHILD_PROCESS_INIT;
1883	struct strbuf buf = STRBUF_INIT;
1884	FILE *fp;
1885	unsigned dirty_submodule = 0;
1886	const char *git_dir;
1887	int ignore_cp_exit_code = 0;
1888
1889	if (validate_submodule_path(path) < 0)
1890	exit(128);
1891
1892	strbuf_addf(&buf, "%s/.git", path);
1893	git_dir = read_gitfile(buf.buf);
1894	if (!git_dir)
1895	git_dir = buf.buf;
1896	if (!is_git_directory(git_dir)) {
1897	if (is_directory(git_dir))
1898	die(_("'%s' not recognized as a git repository"), git_dir);
1899	strbuf_release(&buf);
1900	/* The submodule is not checked out, so it is not modified */
1901	return 0;
1902	}
1903	strbuf_reset(&buf);
1904
1905	strvec_pushl(&cp.args, "status", "--porcelain=2", NULL);
1906	if (ignore_untracked)
1907	strvec_push(&cp.args, "-uno");
1908
1909	prepare_submodule_repo_env(&cp.env);
1910	cp.git_cmd = 1;
1911	cp.no_stdin = 1;
1912	cp.out = -1;
1913	cp.dir = path;
1914	if (start_command(&cp))
1915	die(_("Could not run 'git status --porcelain=2' in submodule %s"), path);
1916
1917	fp = xfdopen(cp.out, "r");
1918	while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
1919	/* regular untracked files */
1920	if (buf.buf[0] == '?')
1921	dirty_submodule \|= DIRTY_SUBMODULE_UNTRACKED;
1922
1923	if (buf.buf[0] == 'u' \|\|
1924	buf.buf[0] == '1' \|\|
1925	buf.buf[0] == '2') {
1926	/* T = line type, XY = status, SSSS = submodule state */
1927	if (buf.len < strlen("T XY SSSS"))
1928	BUG("invalid status --porcelain=2 line %s",
1929	buf.buf);
1930
1931	if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
1932	/* nested untracked file */
1933	dirty_submodule \|= DIRTY_SUBMODULE_UNTRACKED;
1934
1935	if (buf.buf[0] == 'u' \|\|
1936	buf.buf[0] == '2' \|\|
1937	memcmp(buf.buf + 5, "S..U", 4))
1938	/* other change */
1939	dirty_submodule \|= DIRTY_SUBMODULE_MODIFIED;
1940	}
1941
1942	if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
1943	((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) \|\|
1944	ignore_untracked)) {
1945	/*
1946	* We're not interested in any further information from
1947	* the child any more, neither output nor its exit code.
1948	*/
1949	ignore_cp_exit_code = 1;
1950	break;
1951	}
1952	}
1953	fclose(fp);
1954
1955	if (finish_command(&cp) && !ignore_cp_exit_code)
1956	die(_("'git status --porcelain=2' failed in submodule %s"), path);
1957
1958	strbuf_release(&buf);
1959	return dirty_submodule;
1960	}
1961
1962	int submodule_uses_gitfile(const char *path)
1963	{
1964	struct child_process cp = CHILD_PROCESS_INIT;
1965	struct strbuf buf = STRBUF_INIT;
1966	const char *git_dir;
1967
1968	if (validate_submodule_path(path) < 0)
1969	exit(128);
1970
1971	strbuf_addf(&buf, "%s/.git", path);
1972	git_dir = read_gitfile(buf.buf);
1973	if (!git_dir) {
1974	strbuf_release(&buf);
1975	return 0;
1976	}
1977	strbuf_release(&buf);
1978
1979	/* Now test that all nested submodules use a gitfile too */
1980	strvec_pushl(&cp.args,
1981	"submodule", "foreach", "--quiet", "--recursive",
1982	"test -f .git", NULL);
1983
1984	prepare_submodule_repo_env(&cp.env);
1985	cp.git_cmd = 1;
1986	cp.no_stdin = 1;
1987	cp.no_stderr = 1;
1988	cp.no_stdout = 1;
1989	cp.dir = path;
1990	if (run_command(&cp))
1991	return 0;
1992
1993	return 1;
1994	}
1995
1996	/*
1997	* Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
1998	* when doing so.
1999	*
2000	* Return 1 if we'd lose data, return 0 if the removal is fine,
2001	* and negative values for errors.
2002	*/
2003	int bad_to_remove_submodule(const char *path, unsigned flags)
2004	{
2005	ssize_t len;
2006	struct child_process cp = CHILD_PROCESS_INIT;
2007	struct strbuf buf = STRBUF_INIT;
2008	int ret = 0;
2009
2010	if (validate_submodule_path(path) < 0)
2011	exit(128);
2012
2013	if (!file_exists(path) \|\| is_empty_dir(path))
2014	return 0;
2015
2016	if (!submodule_uses_gitfile(path))
2017	return 1;
2018
2019	strvec_pushl(&cp.args, "status", "--porcelain",
2020	"--ignore-submodules=none", NULL);
2021
2022	if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
2023	strvec_push(&cp.args, "-uno");
2024	else
2025	strvec_push(&cp.args, "-uall");
2026
2027	if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
2028	strvec_push(&cp.args, "--ignored");
2029
2030	prepare_submodule_repo_env(&cp.env);
2031	cp.git_cmd = 1;
2032	cp.no_stdin = 1;
2033	cp.out = -1;
2034	cp.dir = path;
2035	if (start_command(&cp)) {
2036	if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
2037	die(_("could not start 'git status' in submodule '%s'"),
2038	path);
2039	ret = -1;
2040	goto out;
2041	}
2042
2043	len = strbuf_read(&buf, cp.out, 1024);
2044	if (len > 2)
2045	ret = 1;
2046	close(cp.out);
2047
2048	if (finish_command(&cp)) {
2049	if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
2050	die(_("could not run 'git status' in submodule '%s'"),
2051	path);
2052	ret = -1;
2053	}
2054	out:
2055	strbuf_release(&buf);
2056	return ret;
2057	}
2058
2059	void submodule_unset_core_worktree(const struct submodule *sub)
2060	{
2061	struct strbuf config_path = STRBUF_INIT;
2062
2063	if (validate_submodule_path(sub->path) < 0)
2064	exit(128);
2065
2066	submodule_name_to_gitdir(&config_path, the_repository, sub->name);
2067	strbuf_addstr(&config_path, "/config");
2068
2069	if (repo_config_set_in_file_gently(the_repository, config_path.buf, "core.worktree", NULL, NULL))
2070	warning(_("Could not unset core.worktree setting in submodule '%s'"),
2071	sub->path);
2072
2073	strbuf_release(&config_path);
2074	}
2075
2076	static int submodule_has_dirty_index(const struct submodule *sub)
2077	{
2078	struct child_process cp = CHILD_PROCESS_INIT;
2079
2080	if (validate_submodule_path(sub->path) < 0)
2081	exit(128);
2082
2083	prepare_submodule_repo_env(&cp.env);
2084
2085	cp.git_cmd = 1;
2086	strvec_pushl(&cp.args, "diff-index", "--quiet",
2087	"--cached", "HEAD", NULL);
2088	cp.no_stdin = 1;
2089	cp.no_stdout = 1;
2090	cp.dir = sub->path;
2091	if (start_command(&cp))
2092	die(_("could not recurse into submodule '%s'"), sub->path);
2093
2094	return finish_command(&cp);
2095	}
2096
2097	static void submodule_reset_index(const char path, const char super_prefix)
2098	{
2099	struct child_process cp = CHILD_PROCESS_INIT;
2100
2101	if (validate_submodule_path(path) < 0)
2102	exit(128);
2103
2104	prepare_submodule_repo_env(&cp.env);
2105
2106	cp.git_cmd = 1;
2107	cp.no_stdin = 1;
2108	cp.dir = path;
2109
2110	/* TODO: determine if this might overwright untracked files */
2111	strvec_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
2112	strvec_pushf(&cp.args, "--super-prefix=%s%s/",
2113	(super_prefix ? super_prefix : ""), path);
2114
2115	strvec_push(&cp.args, empty_tree_oid_hex(the_repository->hash_algo));
2116
2117	if (run_command(&cp))
2118	die(_("could not reset submodule index"));
2119	}
2120
2121	/**
2122	* Moves a submodule at a given path from a given head to another new head.
2123	* For edge cases (a submodule coming into existence or removing a submodule)
2124	* pass NULL for old or new respectively.
2125	*/
2126	int submodule_move_head(const char path, const char super_prefix,
2127	const char old_head, const char new_head,
2128	unsigned flags)
2129	{
2130	int ret = 0;
2131	struct child_process cp = CHILD_PROCESS_INIT;
2132	const struct submodule *sub;
2133	int *error_code_ptr, error_code;
2134
2135	if (!is_submodule_active(the_repository, path))
2136	return 0;
2137
2138	if (flags & SUBMODULE_MOVE_HEAD_FORCE)
2139	/*
2140	* Pass non NULL pointer to is_submodule_populated_gently
2141	* to prevent die()-ing. We'll use connect_work_tree_and_git_dir
2142	* to fixup the submodule in the force case later.
2143	*/
2144	error_code_ptr = &error_code;
2145	else
2146	error_code_ptr = NULL;
2147
2148	if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
2149	return 0;
2150
2151	sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path);
2152
2153	if (!sub)
2154	BUG("could not get submodule information for '%s'", path);
2155
2156	if (old_head && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
2157	/* Check if the submodule has a dirty index. */
2158	if (submodule_has_dirty_index(sub))
2159	return error(_("submodule '%s' has dirty index"), path);
2160	}
2161
2162	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
2163	if (old_head) {
2164	if (!submodule_uses_gitfile(path))
2165	absorb_git_dir_into_superproject(path,
2166	super_prefix);
2167	else {
2168	char *dotgit = xstrfmt("%s/.git", path);
2169	char *git_dir = xstrdup(read_gitfile(dotgit));
2170
2171	free(dotgit);
2172	if (validate_submodule_git_dir(git_dir,
2173	sub->name) < 0)
2174	die(_("refusing to create/use '%s' in "
2175	"another submodule's git dir. "
2176	"Enabling extensions.submodulePathConfig "
2177	"should fix this."), git_dir);
2178	free(git_dir);
2179	}
2180	} else {
2181	struct strbuf gitdir = STRBUF_INIT;
2182	submodule_name_to_gitdir(&gitdir, the_repository,
2183	sub->name);
2184	connect_work_tree_and_git_dir(path, gitdir.buf, 0);
2185	strbuf_release(&gitdir);
2186
2187	/* make sure the index is clean as well */
2188	submodule_reset_index(path, super_prefix);
2189	}
2190
2191	if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
2192	struct strbuf gitdir = STRBUF_INIT;
2193	submodule_name_to_gitdir(&gitdir, the_repository,
2194	sub->name);
2195	connect_work_tree_and_git_dir(path, gitdir.buf, 1);
2196	strbuf_release(&gitdir);
2197	}
2198	}
2199
2200	prepare_submodule_repo_env(&cp.env);
2201
2202	cp.git_cmd = 1;
2203	cp.no_stdin = 1;
2204	cp.dir = path;
2205
2206	strvec_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
2207	strvec_pushf(&cp.args, "--super-prefix=%s%s/",
2208	(super_prefix ? super_prefix : ""), path);
2209
2210	if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
2211	strvec_push(&cp.args, "-n");
2212	else
2213	strvec_push(&cp.args, "-u");
2214
2215	if (flags & SUBMODULE_MOVE_HEAD_FORCE)
2216	strvec_push(&cp.args, "--reset");
2217	else
2218	strvec_push(&cp.args, "-m");
2219
2220	if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
2221	strvec_push(&cp.args, old_head ? old_head : empty_tree_oid_hex(the_repository->hash_algo));
2222
2223	strvec_push(&cp.args, new_head ? new_head : empty_tree_oid_hex(the_repository->hash_algo));
2224
2225	if (run_command(&cp)) {
2226	ret = error(_("Submodule '%s' could not be updated."), path);
2227	goto out;
2228	}
2229
2230	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
2231	if (new_head) {
2232	child_process_init(&cp);
2233	/* also set the HEAD accordingly */
2234	cp.git_cmd = 1;
2235	cp.no_stdin = 1;
2236	cp.dir = path;
2237
2238	prepare_submodule_repo_env(&cp.env);
2239	strvec_pushl(&cp.args, "update-ref", "HEAD",
2240	"--no-deref", new_head, NULL);
2241
2242	if (run_command(&cp)) {
2243	ret = -1;
2244	goto out;
2245	}
2246	} else {
2247	struct strbuf sb = STRBUF_INIT;
2248
2249	strbuf_addf(&sb, "%s/.git", path);
2250	unlink_or_warn(sb.buf);
2251	strbuf_release(&sb);
2252
2253	if (is_empty_dir(path))
2254	rmdir_or_warn(path);
2255
2256	submodule_unset_core_worktree(sub);
2257	}
2258	}
2259	out:
2260	return ret;
2261	}
2262
2263	static int check_casefolding_conflict(const char *git_dir,
2264	const char *submodule_name,
2265	const bool suffixes_match)
2266	{
2267	char p, modules_dir = xstrdup(git_dir);
2268	struct dirent *de;
2269	DIR *dir = NULL;
2270	int ret = 0;
2271
2272	if ((p = find_last_dir_sep(modules_dir)))
2273	*p = '\0';
2274
2275	/* No conflict is possible if modules_dir doesn't exist (first clone) */
2276	if (!is_directory(modules_dir))
2277	goto cleanup;
2278
2279	dir = opendir(modules_dir);
2280	if (!dir) {
2281	ret = -1;
2282	goto cleanup;
2283	}
2284
2285	/* Check for another directory under .git/modules that differs only in case. */
2286	while ((de = readdir(dir))) {
2287	if (!strcmp(de->d_name, ".") \|\| !strcmp(de->d_name, ".."))
2288	continue;
2289
2290	if ((suffixes_match \|\| is_git_directory(git_dir)) &&
2291	!strcasecmp(de->d_name, submodule_name) &&
2292	strcmp(de->d_name, submodule_name)) {
2293	ret = -1; /* collision found */
2294	break;
2295	}
2296	}
2297
2298	cleanup:
2299	if (dir)
2300	closedir(dir);
2301	free(modules_dir);
2302	return ret;
2303	}
2304
2305	struct submodule_from_gitdir_cb {
2306	const char *gitdir;
2307	const char *submodule_name;
2308	bool conflict_found;
2309	};
2310
2311	static int find_conflict_by_gitdir_cb(const char var, const char value,
2312	const struct config_context ctx UNUSED, void data)
2313	{
2314	struct submodule_from_gitdir_cb *cb = data;
2315	const char *submodule_name_start;
2316	size_t submodule_name_len;
2317	const char *suffix = ".gitdir";
2318	size_t suffix_len = strlen(suffix);
2319
2320	if (!skip_prefix(var, "submodule.", &submodule_name_start))
2321	return 0;
2322
2323	/* Check if submodule_name_start ends with ".gitdir" */
2324	submodule_name_len = strlen(submodule_name_start);
2325	if (submodule_name_len < suffix_len \|\|
2326	strcmp(submodule_name_start + submodule_name_len - suffix_len, suffix) != 0)
2327	return 0; /* Does not end with ".gitdir" */
2328
2329	submodule_name_len -= suffix_len;
2330
2331	/*
2332	* A conflict happens if:
2333	* 1. The submodule names are different and
2334	* 2. The gitdir paths resolve to the same absolute path
2335	*/
2336	if (value && strncmp(cb->submodule_name, submodule_name_start, submodule_name_len)) {
2337	char *abs_path_cb = absolute_pathdup(cb->gitdir);
2338	char *abs_path_value = absolute_pathdup(value);
2339
2340	cb->conflict_found = !strcmp(abs_path_cb, abs_path_value);
2341
2342	free(abs_path_cb);
2343	free(abs_path_value);
2344	}
2345
2346	return cb->conflict_found;
2347	}
2348
2349	static bool submodule_conflicts_with_existing(const char gitdir, const char submodule_name)
2350	{
2351	struct submodule_from_gitdir_cb cb = { 0 };
2352	cb.submodule_name = submodule_name;
2353	cb.gitdir = gitdir;
2354
2355	/* Find conflicts with existing repo gitdir configs */
2356	repo_config(the_repository, find_conflict_by_gitdir_cb, &cb);
2357
2358	return cb.conflict_found;
2359	}
2360
2361	/*
2362	* Encoded gitdir validation, only used when extensions.submodulePathConfig is enabled.
2363	* This does not print errors like the non-encoded version, because encoding is supposed
2364	* to mitigate / fix all these.
2365	*/
2366	static int validate_submodule_encoded_git_dir(char git_dir, const char submodule_name)
2367	{
2368	const char *modules_marker = "/modules/";
2369	char p = git_dir, last_submodule_name = NULL;
2370	int config_ignorecase = 0;
2371
2372	if (!the_repository->repository_format_submodule_path_cfg)
2373	BUG("validate_submodule_encoded_git_dir() must be called with "
2374	"extensions.submodulePathConfig enabled.");
2375
2376	/* Find the last submodule name in the gitdir path (modules can be nested). */
2377	while ((p = strstr(p, modules_marker))) {
2378	last_submodule_name = p + strlen(modules_marker);
2379	p++;
2380	}
2381
2382	/* Prevent the use of '/' in encoded names */
2383	if (!last_submodule_name \|\| strchr(last_submodule_name, '/'))
2384	return -1;
2385
2386	/* Prevent conflicts with existing submodule gitdirs */
2387	if (is_git_directory(git_dir) &&
2388	submodule_conflicts_with_existing(git_dir, submodule_name))
2389	return -1;
2390
2391	/* Prevent conflicts on case-folding filesystems */
2392	repo_config_get_bool(the_repository, "core.ignorecase", &config_ignorecase);
2393	if (ignore_case \|\| config_ignorecase) {
2394	bool suffixes_match = !strcmp(last_submodule_name, submodule_name);
2395	return check_casefolding_conflict(git_dir, submodule_name,
2396	suffixes_match);
2397	}
2398
2399	return 0;
2400	}
2401
2402	static int validate_submodule_legacy_git_dir(char git_dir, const char submodule_name)
2403	{
2404	size_t len = strlen(git_dir), suffix_len = strlen(submodule_name);
2405	char *p;
2406	int ret = 0;
2407
2408	if (the_repository->repository_format_submodule_path_cfg)
2409	BUG("validate_submodule_git_dir() must be called with "
2410	"extensions.submodulePathConfig disabled.");
2411
2412	if (len <= suffix_len \|\| (p = git_dir + len - suffix_len)[-1] != '/' \|\|
2413	strcmp(p, submodule_name))
2414	BUG("submodule name '%s' not a suffix of git dir '%s'",
2415	submodule_name, git_dir);
2416
2417	/*
2418	* We prevent the contents of sibling submodules' git directories to
2419	* clash.
2420	*
2421	* Example: having a submodule named `hippo` and another one named
2422	* `hippo/hooks` would result in the git directories
2423	* `.git/modules/hippo/` and `.git/modules/hippo/hooks/`, respectively,
2424	* but the latter directory is already designated to contain the hooks
2425	* of the former.
2426	*/
2427	for (; *p; p++) {
2428	if (is_dir_sep(*p)) {
2429	char c = *p;
2430
2431	*p = '\0';
2432	if (is_git_directory(git_dir))
2433	ret = -1;
2434	*p = c;
2435
2436	if (ret < 0)
2437	return error(_("submodule git dir '%s' is "
2438	"inside git dir '%.*s'"),
2439	git_dir,
2440	(int)(p - git_dir), git_dir);
2441	}
2442	}
2443
2444	return 0;
2445	}
2446
2447	int validate_submodule_git_dir(char git_dir, const char submodule_name)
2448	{
2449	if (!the_repository->repository_format_submodule_path_cfg)
2450	return validate_submodule_legacy_git_dir(git_dir, submodule_name);
2451
2452	return validate_submodule_encoded_git_dir(git_dir, submodule_name);
2453	}
2454
2455	int validate_submodule_path(const char *path)
2456	{
2457	char *p = xstrdup(path);
2458	struct stat st;
2459	int i, ret = 0;
2460	char sep;
2461
2462	for (i = 0; !ret && p[i]; i++) {
2463	if (!is_dir_sep(p[i]))
2464	continue;
2465
2466	sep = p[i];
2467	p[i] = '\0';
2468	/* allow missing components, but no symlinks */
2469	ret = lstat(p, &st) \|\| !S_ISLNK(st.st_mode) ? 0 : -1;
2470	p[i] = sep;
2471	if (ret)
2472	error(_("expected '%.*s' in submodule path '%s' not to "
2473	"be a symbolic link"), i, p, p);
2474	}
2475	if (!lstat(p, &st) && S_ISLNK(st.st_mode))
2476	ret = error(_("expected submodule path '%s' not to be a "
2477	"symbolic link"), p);
2478	free(p);
2479	return ret;
2480	}
2481
2482
2483	/*
2484	* Embeds a single submodules git directory into the superprojects git dir,
2485	* non recursively.
2486	*/
2487	static void relocate_single_git_dir_into_superproject(const char *path,
2488	const char *super_prefix)
2489	{
2490	char old_git_dir = NULL, real_old_git_dir = NULL, *real_new_git_dir = NULL;
2491	struct strbuf new_gitdir = STRBUF_INIT;
2492	const struct submodule *sub;
2493
2494	if (validate_submodule_path(path) < 0)
2495	exit(128);
2496
2497	if (submodule_uses_worktrees(path))
2498	die(_("relocate_gitdir for submodule '%s' with "
2499	"more than one worktree not supported"), path);
2500
2501	old_git_dir = xstrfmt("%s/.git", path);
2502	if (read_gitfile(old_git_dir))
2503	/* If it is an actual gitfile, it doesn't need migration. */
2504	return;
2505
2506	real_old_git_dir = real_pathdup(old_git_dir, 1);
2507
2508	sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path);
2509	if (!sub)
2510	die(_("could not lookup name for submodule '%s'"), path);
2511
2512	submodule_name_to_gitdir(&new_gitdir, the_repository, sub->name);
2513	if (safe_create_leading_directories_const(the_repository, new_gitdir.buf) < 0)
2514	die(_("could not create directory '%s'"), new_gitdir.buf);
2515	real_new_git_dir = real_pathdup(new_gitdir.buf, 1);
2516
2517	fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
2518	super_prefix ? super_prefix : "", path,
2519	real_old_git_dir, real_new_git_dir);
2520
2521	relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
2522
2523	free(old_git_dir);
2524	free(real_old_git_dir);
2525	free(real_new_git_dir);
2526	strbuf_release(&new_gitdir);
2527	}
2528
2529	static void absorb_git_dir_into_superproject_recurse(const char *path,
2530	const char *super_prefix)
2531	{
2532
2533	struct child_process cp = CHILD_PROCESS_INIT;
2534
2535	if (validate_submodule_path(path) < 0)
2536	exit(128);
2537
2538	cp.dir = path;
2539	cp.git_cmd = 1;
2540	cp.no_stdin = 1;
2541	strvec_pushl(&cp.args, "submodule--helper",
2542	"absorbgitdirs", NULL);
2543	strvec_pushf(&cp.args, "--super-prefix=%s%s/", super_prefix ?
2544	super_prefix : "", path);
2545
2546	prepare_submodule_repo_env(&cp.env);
2547	if (run_command(&cp))
2548	die(_("could not recurse into submodule '%s'"), path);
2549	}
2550
2551	/*
2552	* Migrate the git directory of the submodule given by path from
2553	* having its git directory within the working tree to the git dir nested
2554	* in its superprojects git dir under modules/.
2555	*/
2556	void absorb_git_dir_into_superproject(const char *path,
2557	const char *super_prefix)
2558	{
2559	int err_code;
2560	const char *sub_git_dir;
2561	struct strbuf gitdir = STRBUF_INIT;
2562
2563	if (validate_submodule_path(path) < 0)
2564	exit(128);
2565
2566	strbuf_addf(&gitdir, "%s/.git", path);
2567	sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
2568
2569	/* Not populated? */
2570	if (!sub_git_dir) {
2571	const struct submodule *sub;
2572	struct strbuf sub_gitdir = STRBUF_INIT;
2573
2574	if (err_code == READ_GITFILE_ERR_MISSING) {
2575	/* unpopulated as expected */
2576	strbuf_release(&gitdir);
2577	return;
2578	}
2579
2580	if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
2581	/* We don't know what broke here. */
2582	read_gitfile_error_die(err_code, path, NULL);
2583
2584	/*
2585	* Maybe populated, but no git directory was found?
2586	* This can happen if the superproject is a submodule
2587	* itself and was just absorbed. The absorption of the
2588	* superproject did not rewrite the git file links yet,
2589	* fix it now.
2590	*/
2591	sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path);
2592	if (!sub)
2593	die(_("could not lookup name for submodule '%s'"), path);
2594	submodule_name_to_gitdir(&sub_gitdir, the_repository, sub->name);
2595	connect_work_tree_and_git_dir(path, sub_gitdir.buf, 0);
2596	strbuf_release(&sub_gitdir);
2597	} else {
2598	/* Is it already absorbed into the superprojects git dir? */
2599	char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
2600	char *real_common_git_dir = real_pathdup(repo_get_common_dir(the_repository), 1);
2601
2602	if (!starts_with(real_sub_git_dir, real_common_git_dir))
2603	relocate_single_git_dir_into_superproject(path, super_prefix);
2604
2605	free(real_sub_git_dir);
2606	free(real_common_git_dir);
2607	}
2608	strbuf_release(&gitdir);
2609
2610	absorb_git_dir_into_superproject_recurse(path, super_prefix);
2611	}
2612
2613	int get_superproject_working_tree(struct strbuf *buf)
2614	{
2615	struct child_process cp = CHILD_PROCESS_INIT;
2616	struct strbuf sb = STRBUF_INIT;
2617	struct strbuf one_up = STRBUF_INIT;
2618	char *cwd = xgetcwd();
2619	int ret = 0;
2620	const char *subpath;
2621	int code;
2622	ssize_t len;
2623
2624	if (!is_inside_work_tree(the_repository))
2625	/*
2626	* FIXME:
2627	* We might have a superproject, but it is harder
2628	* to determine.
2629	*/
2630	return 0;
2631
2632	if (!strbuf_realpath(&one_up, "../", 0))
2633	return 0;
2634
2635	subpath = relative_path(cwd, one_up.buf, &sb);
2636	strbuf_release(&one_up);
2637
2638	prepare_submodule_repo_env(&cp.env);
2639	strvec_pop(&cp.env);
2640
2641	strvec_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
2642	"ls-files", "-z", "--stage", "--full-name", "--",
2643	subpath, NULL);
2644	strbuf_reset(&sb);
2645
2646	cp.no_stdin = 1;
2647	cp.no_stderr = 1;
2648	cp.out = -1;
2649	cp.git_cmd = 1;
2650
2651	if (start_command(&cp))
2652	die(_("could not start ls-files in .."));
2653
2654	len = strbuf_read(&sb, cp.out, PATH_MAX);
2655	close(cp.out);
2656
2657	if (starts_with(sb.buf, "160000")) {
2658	int super_sub_len;
2659	int cwd_len = strlen(cwd);
2660	char super_sub, super_wt;
2661
2662	/*
2663	* There is a superproject having this repo as a submodule.
2664	* The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
2665	* We're only interested in the name after the tab.
2666	*/
2667	super_sub = strchr(sb.buf, '\t') + 1;
2668	super_sub_len = strlen(super_sub);
2669
2670	if (super_sub_len > cwd_len \|\|
2671	strcmp(&cwd[cwd_len - super_sub_len], super_sub))
2672	BUG("returned path string doesn't match cwd?");
2673
2674	super_wt = xstrdup(cwd);
2675	super_wt[cwd_len - super_sub_len] = '\0';
2676
2677	strbuf_realpath(buf, super_wt, 1);
2678	ret = 1;
2679	free(super_wt);
2680	}
2681	free(cwd);
2682	strbuf_release(&sb);
2683
2684	code = finish_command(&cp);
2685
2686	if (code == 128)
2687	/* '../' is not a git repository */
2688	return 0;
2689	if (code == 0 && len == 0)
2690	/* There is an unrelated git repository at '../' */
2691	return 0;
2692	if (code)
2693	die(_("ls-tree returned unexpected return code %d"), code);
2694
2695	return ret;
2696	}
2697
2698	/*
2699	* Put the gitdir for a submodule (given relative to the main
2700	* repository worktree) into `buf`, or return -1 on error.
2701	*/
2702	int submodule_to_gitdir(struct repository *repo,
2703	struct strbuf buf, const char submodule)
2704	{
2705	const struct submodule *sub;
2706	const char *git_dir;
2707	int ret = 0;
2708
2709	if (validate_submodule_path(submodule) < 0)
2710	exit(128);
2711
2712	strbuf_reset(buf);
2713	strbuf_addstr(buf, submodule);
2714	strbuf_complete(buf, '/');
2715	strbuf_addstr(buf, ".git");
2716
2717	git_dir = read_gitfile(buf->buf);
2718	if (git_dir) {
2719	strbuf_reset(buf);
2720	strbuf_addstr(buf, git_dir);
2721	}
2722	if (!is_git_directory(buf->buf)) {
2723	sub = submodule_from_path(repo, null_oid(the_hash_algo), submodule);
2724	if (!sub) {
2725	ret = -1;
2726	goto cleanup;
2727	}
2728	strbuf_reset(buf);
2729	submodule_name_to_gitdir(buf, repo, sub->name);
2730	}
2731
2732	cleanup:
2733	return ret;
2734	}
2735
2736	void submodule_name_to_gitdir(struct strbuf buf, struct repository r,
2737	const char *submodule_name)
2738	{
2739	if (!r->repository_format_submodule_path_cfg) {
2740	/*
2741	* If extensions.submodulePathConfig is disabled,
2742	* continue to use the plain path.
2743	*/
2744	repo_git_path_append(r, buf, "modules/%s", submodule_name);
2745	} else {
2746	const char *gitdir;
2747	char *key;
2748	int ret;
2749
2750	/* Otherwise the extension is enabled, so use the gitdir config. */
2751	key = xstrfmt("submodule.%s.gitdir", submodule_name);
2752	ret = repo_config_get_string_tmp(r, key, &gitdir);
2753	FREE_AND_NULL(key);
2754
2755	if (ret)
2756	die(_("the 'submodule.%s.gitdir' config does not exist for module '%s'. "
2757	"Please ensure it is set, for example by running something like: "
2758	"'git config submodule.%s.gitdir .git/modules/%s'. For details "
2759	"see the extensions.submodulePathConfig documentation."),
2760	submodule_name, submodule_name, submodule_name, submodule_name);
2761
2762	strbuf_addstr(buf, gitdir);
2763	}
2764
2765	/* validate because users might have modified the config */
2766	if (validate_submodule_git_dir(buf->buf, submodule_name)) {
2767	advise(_("enabling extensions.submodulePathConfig might fix the "
2768	"following error, if it's not already enabled."));
2769	die(_("refusing to create/use '%s' in another submodule's "
2770	" git dir."), buf->buf);
2771	}
2772	}