Imported Upstream version 2.14.4
[platform/upstream/git.git] / submodule-config.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "submodule-config.h"
5 #include "submodule.h"
6 #include "strbuf.h"
7 #include "parse-options.h"
8
9 /*
10  * submodule cache lookup structure
11  * There is one shared set of 'struct submodule' entries which can be
12  * looked up by their sha1 blob id of the .gitmodule file and either
13  * using path or name as key.
14  * for_path stores submodule entries with path as key
15  * for_name stores submodule entries with name as key
16  */
17 struct submodule_cache {
18         struct hashmap for_path;
19         struct hashmap for_name;
20         unsigned initialized:1;
21 };
22
23 /*
24  * thin wrapper struct needed to insert 'struct submodule' entries to
25  * the hashmap
26  */
27 struct submodule_entry {
28         struct hashmap_entry ent;
29         struct submodule *config;
30 };
31
32 enum lookup_type {
33         lookup_name,
34         lookup_path
35 };
36
37 static int config_path_cmp(const void *unused_cmp_data,
38                            const struct submodule_entry *a,
39                            const struct submodule_entry *b,
40                            const void *unused_keydata)
41 {
42         return strcmp(a->config->path, b->config->path) ||
43                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
44 }
45
46 static int config_name_cmp(const void *unused_cmp_data,
47                            const struct submodule_entry *a,
48                            const struct submodule_entry *b,
49                            const void *unused_keydata)
50 {
51         return strcmp(a->config->name, b->config->name) ||
52                hashcmp(a->config->gitmodules_sha1, b->config->gitmodules_sha1);
53 }
54
55 static struct submodule_cache *submodule_cache_alloc(void)
56 {
57         return xcalloc(1, sizeof(struct submodule_cache));
58 }
59
60 static void submodule_cache_init(struct submodule_cache *cache)
61 {
62         hashmap_init(&cache->for_path, (hashmap_cmp_fn) config_path_cmp, NULL, 0);
63         hashmap_init(&cache->for_name, (hashmap_cmp_fn) config_name_cmp, NULL, 0);
64         cache->initialized = 1;
65 }
66
67 static void free_one_config(struct submodule_entry *entry)
68 {
69         free((void *) entry->config->path);
70         free((void *) entry->config->name);
71         free((void *) entry->config->branch);
72         free((void *) entry->config->update_strategy.command);
73         free(entry->config);
74 }
75
76 static void submodule_cache_clear(struct submodule_cache *cache)
77 {
78         struct hashmap_iter iter;
79         struct submodule_entry *entry;
80
81         if (!cache->initialized)
82                 return;
83
84         /*
85          * We iterate over the name hash here to be symmetric with the
86          * allocation of struct submodule entries. Each is allocated by
87          * their .gitmodule blob sha1 and submodule name.
88          */
89         hashmap_iter_init(&cache->for_name, &iter);
90         while ((entry = hashmap_iter_next(&iter)))
91                 free_one_config(entry);
92
93         hashmap_free(&cache->for_path, 1);
94         hashmap_free(&cache->for_name, 1);
95         cache->initialized = 0;
96 }
97
98 void submodule_cache_free(struct submodule_cache *cache)
99 {
100         submodule_cache_clear(cache);
101         free(cache);
102 }
103
104 static unsigned int hash_sha1_string(const unsigned char *sha1,
105                                      const char *string)
106 {
107         return memhash(sha1, 20) + strhash(string);
108 }
109
110 static void cache_put_path(struct submodule_cache *cache,
111                            struct submodule *submodule)
112 {
113         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
114                                              submodule->path);
115         struct submodule_entry *e = xmalloc(sizeof(*e));
116         hashmap_entry_init(e, hash);
117         e->config = submodule;
118         hashmap_put(&cache->for_path, e);
119 }
120
121 static void cache_remove_path(struct submodule_cache *cache,
122                               struct submodule *submodule)
123 {
124         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
125                                              submodule->path);
126         struct submodule_entry e;
127         struct submodule_entry *removed;
128         hashmap_entry_init(&e, hash);
129         e.config = submodule;
130         removed = hashmap_remove(&cache->for_path, &e, NULL);
131         free(removed);
132 }
133
134 static void cache_add(struct submodule_cache *cache,
135                       struct submodule *submodule)
136 {
137         unsigned int hash = hash_sha1_string(submodule->gitmodules_sha1,
138                                              submodule->name);
139         struct submodule_entry *e = xmalloc(sizeof(*e));
140         hashmap_entry_init(e, hash);
141         e->config = submodule;
142         hashmap_add(&cache->for_name, e);
143 }
144
145 static const struct submodule *cache_lookup_path(struct submodule_cache *cache,
146                 const unsigned char *gitmodules_sha1, const char *path)
147 {
148         struct submodule_entry *entry;
149         unsigned int hash = hash_sha1_string(gitmodules_sha1, path);
150         struct submodule_entry key;
151         struct submodule key_config;
152
153         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
154         key_config.path = path;
155
156         hashmap_entry_init(&key, hash);
157         key.config = &key_config;
158
159         entry = hashmap_get(&cache->for_path, &key, NULL);
160         if (entry)
161                 return entry->config;
162         return NULL;
163 }
164
165 static struct submodule *cache_lookup_name(struct submodule_cache *cache,
166                 const unsigned char *gitmodules_sha1, const char *name)
167 {
168         struct submodule_entry *entry;
169         unsigned int hash = hash_sha1_string(gitmodules_sha1, name);
170         struct submodule_entry key;
171         struct submodule key_config;
172
173         hashcpy(key_config.gitmodules_sha1, gitmodules_sha1);
174         key_config.name = name;
175
176         hashmap_entry_init(&key, hash);
177         key.config = &key_config;
178
179         entry = hashmap_get(&cache->for_name, &key, NULL);
180         if (entry)
181                 return entry->config;
182         return NULL;
183 }
184
185 int check_submodule_name(const char *name)
186 {
187         /* Disallow empty names */
188         if (!*name)
189                 return -1;
190
191         /*
192          * Look for '..' as a path component. Check both '/' and '\\' as
193          * separators rather than is_dir_sep(), because we want the name rules
194          * to be consistent across platforms.
195          */
196         goto in_component; /* always start inside component */
197         while (*name) {
198                 char c = *name++;
199                 if (c == '/' || c == '\\') {
200 in_component:
201                         if (name[0] == '.' && name[1] == '.' &&
202                             (!name[2] || name[2] == '/' || name[2] == '\\'))
203                                 return -1;
204                 }
205         }
206
207         return 0;
208 }
209
210 static int name_and_item_from_var(const char *var, struct strbuf *name,
211                                   struct strbuf *item)
212 {
213         const char *subsection, *key;
214         int subsection_len, parse;
215         parse = parse_config_key(var, "submodule", &subsection,
216                         &subsection_len, &key);
217         if (parse < 0 || !subsection)
218                 return 0;
219
220         strbuf_add(name, subsection, subsection_len);
221         if (check_submodule_name(name->buf) < 0) {
222                 warning(_("ignoring suspicious submodule name: %s"), name->buf);
223                 strbuf_release(name);
224                 return 0;
225         }
226
227         strbuf_addstr(item, key);
228
229         return 1;
230 }
231
232 static struct submodule *lookup_or_create_by_name(struct submodule_cache *cache,
233                 const unsigned char *gitmodules_sha1, const char *name)
234 {
235         struct submodule *submodule;
236         struct strbuf name_buf = STRBUF_INIT;
237
238         submodule = cache_lookup_name(cache, gitmodules_sha1, name);
239         if (submodule)
240                 return submodule;
241
242         submodule = xmalloc(sizeof(*submodule));
243
244         strbuf_addstr(&name_buf, name);
245         submodule->name = strbuf_detach(&name_buf, NULL);
246
247         submodule->path = NULL;
248         submodule->url = NULL;
249         submodule->update_strategy.type = SM_UPDATE_UNSPECIFIED;
250         submodule->update_strategy.command = NULL;
251         submodule->fetch_recurse = RECURSE_SUBMODULES_NONE;
252         submodule->ignore = NULL;
253         submodule->branch = NULL;
254         submodule->recommend_shallow = -1;
255
256         hashcpy(submodule->gitmodules_sha1, gitmodules_sha1);
257
258         cache_add(cache, submodule);
259
260         return submodule;
261 }
262
263 static int parse_fetch_recurse(const char *opt, const char *arg,
264                                int die_on_error)
265 {
266         switch (git_config_maybe_bool(opt, arg)) {
267         case 1:
268                 return RECURSE_SUBMODULES_ON;
269         case 0:
270                 return RECURSE_SUBMODULES_OFF;
271         default:
272                 if (!strcmp(arg, "on-demand"))
273                         return RECURSE_SUBMODULES_ON_DEMAND;
274
275                 if (die_on_error)
276                         die("bad %s argument: %s", opt, arg);
277                 else
278                         return RECURSE_SUBMODULES_ERROR;
279         }
280 }
281
282 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
283 {
284         return parse_fetch_recurse(opt, arg, 1);
285 }
286
287 int option_fetch_parse_recurse_submodules(const struct option *opt,
288                                           const char *arg, int unset)
289 {
290         int *v;
291
292         if (!opt->value)
293                 return -1;
294
295         v = opt->value;
296
297         if (unset) {
298                 *v = RECURSE_SUBMODULES_OFF;
299         } else {
300                 if (arg)
301                         *v = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
302                 else
303                         *v = RECURSE_SUBMODULES_ON;
304         }
305         return 0;
306 }
307
308 static int parse_update_recurse(const char *opt, const char *arg,
309                                 int die_on_error)
310 {
311         switch (git_config_maybe_bool(opt, arg)) {
312         case 1:
313                 return RECURSE_SUBMODULES_ON;
314         case 0:
315                 return RECURSE_SUBMODULES_OFF;
316         default:
317                 if (die_on_error)
318                         die("bad %s argument: %s", opt, arg);
319                 return RECURSE_SUBMODULES_ERROR;
320         }
321 }
322
323 int parse_update_recurse_submodules_arg(const char *opt, const char *arg)
324 {
325         return parse_update_recurse(opt, arg, 1);
326 }
327
328 static int parse_push_recurse(const char *opt, const char *arg,
329                                int die_on_error)
330 {
331         switch (git_config_maybe_bool(opt, arg)) {
332         case 1:
333                 /* There's no simple "on" value when pushing */
334                 if (die_on_error)
335                         die("bad %s argument: %s", opt, arg);
336                 else
337                         return RECURSE_SUBMODULES_ERROR;
338         case 0:
339                 return RECURSE_SUBMODULES_OFF;
340         default:
341                 if (!strcmp(arg, "on-demand"))
342                         return RECURSE_SUBMODULES_ON_DEMAND;
343                 else if (!strcmp(arg, "check"))
344                         return RECURSE_SUBMODULES_CHECK;
345                 else if (!strcmp(arg, "only"))
346                         return RECURSE_SUBMODULES_ONLY;
347                 else if (die_on_error)
348                         die("bad %s argument: %s", opt, arg);
349                 else
350                         return RECURSE_SUBMODULES_ERROR;
351         }
352 }
353
354 int parse_push_recurse_submodules_arg(const char *opt, const char *arg)
355 {
356         return parse_push_recurse(opt, arg, 1);
357 }
358
359 static void warn_multiple_config(const unsigned char *treeish_name,
360                                  const char *name, const char *option)
361 {
362         const char *commit_string = "WORKTREE";
363         if (treeish_name)
364                 commit_string = sha1_to_hex(treeish_name);
365         warning("%s:.gitmodules, multiple configurations found for "
366                         "'submodule.%s.%s'. Skipping second one!",
367                         commit_string, name, option);
368 }
369
370 struct parse_config_parameter {
371         struct submodule_cache *cache;
372         const unsigned char *treeish_name;
373         const unsigned char *gitmodules_sha1;
374         int overwrite;
375 };
376
377 static int parse_config(const char *var, const char *value, void *data)
378 {
379         struct parse_config_parameter *me = data;
380         struct submodule *submodule;
381         struct strbuf name = STRBUF_INIT, item = STRBUF_INIT;
382         int ret = 0;
383
384         /* this also ensures that we only parse submodule entries */
385         if (!name_and_item_from_var(var, &name, &item))
386                 return 0;
387
388         submodule = lookup_or_create_by_name(me->cache,
389                                              me->gitmodules_sha1,
390                                              name.buf);
391
392         if (!strcmp(item.buf, "path")) {
393                 if (!value)
394                         ret = config_error_nonbool(var);
395                 else if (!me->overwrite && submodule->path)
396                         warn_multiple_config(me->treeish_name, submodule->name,
397                                         "path");
398                 else {
399                         if (submodule->path)
400                                 cache_remove_path(me->cache, submodule);
401                         free((void *) submodule->path);
402                         submodule->path = xstrdup(value);
403                         cache_put_path(me->cache, submodule);
404                 }
405         } else if (!strcmp(item.buf, "fetchrecursesubmodules")) {
406                 /* when parsing worktree configurations we can die early */
407                 int die_on_error = is_null_sha1(me->gitmodules_sha1);
408                 if (!me->overwrite &&
409                     submodule->fetch_recurse != RECURSE_SUBMODULES_NONE)
410                         warn_multiple_config(me->treeish_name, submodule->name,
411                                         "fetchrecursesubmodules");
412                 else
413                         submodule->fetch_recurse = parse_fetch_recurse(
414                                                                 var, value,
415                                                                 die_on_error);
416         } else if (!strcmp(item.buf, "ignore")) {
417                 if (!value)
418                         ret = config_error_nonbool(var);
419                 else if (!me->overwrite && submodule->ignore)
420                         warn_multiple_config(me->treeish_name, submodule->name,
421                                         "ignore");
422                 else if (strcmp(value, "untracked") &&
423                          strcmp(value, "dirty") &&
424                          strcmp(value, "all") &&
425                          strcmp(value, "none"))
426                         warning("Invalid parameter '%s' for config option "
427                                         "'submodule.%s.ignore'", value, name.buf);
428                 else {
429                         free((void *) submodule->ignore);
430                         submodule->ignore = xstrdup(value);
431                 }
432         } else if (!strcmp(item.buf, "url")) {
433                 if (!value) {
434                         ret = config_error_nonbool(var);
435                 } else if (!me->overwrite && submodule->url) {
436                         warn_multiple_config(me->treeish_name, submodule->name,
437                                         "url");
438                 } else {
439                         free((void *) submodule->url);
440                         submodule->url = xstrdup(value);
441                 }
442         } else if (!strcmp(item.buf, "update")) {
443                 if (!value)
444                         ret = config_error_nonbool(var);
445                 else if (!me->overwrite &&
446                          submodule->update_strategy.type != SM_UPDATE_UNSPECIFIED)
447                         warn_multiple_config(me->treeish_name, submodule->name,
448                                              "update");
449                 else if (parse_submodule_update_strategy(value,
450                          &submodule->update_strategy) < 0)
451                                 die(_("invalid value for %s"), var);
452         } else if (!strcmp(item.buf, "shallow")) {
453                 if (!me->overwrite && submodule->recommend_shallow != -1)
454                         warn_multiple_config(me->treeish_name, submodule->name,
455                                              "shallow");
456                 else
457                         submodule->recommend_shallow =
458                                 git_config_bool(var, value);
459         } else if (!strcmp(item.buf, "branch")) {
460                 if (!me->overwrite && submodule->branch)
461                         warn_multiple_config(me->treeish_name, submodule->name,
462                                              "branch");
463                 else {
464                         free((void *)submodule->branch);
465                         submodule->branch = xstrdup(value);
466                 }
467         }
468
469         strbuf_release(&name);
470         strbuf_release(&item);
471
472         return ret;
473 }
474
475 int gitmodule_sha1_from_commit(const unsigned char *treeish_name,
476                                       unsigned char *gitmodules_sha1,
477                                       struct strbuf *rev)
478 {
479         int ret = 0;
480
481         if (is_null_sha1(treeish_name)) {
482                 hashclr(gitmodules_sha1);
483                 return 1;
484         }
485
486         strbuf_addf(rev, "%s:.gitmodules", sha1_to_hex(treeish_name));
487         if (get_sha1(rev->buf, gitmodules_sha1) >= 0)
488                 ret = 1;
489
490         return ret;
491 }
492
493 /* This does a lookup of a submodule configuration by name or by path
494  * (key) with on-demand reading of the appropriate .gitmodules from
495  * revisions.
496  */
497 static const struct submodule *config_from(struct submodule_cache *cache,
498                 const unsigned char *treeish_name, const char *key,
499                 enum lookup_type lookup_type)
500 {
501         struct strbuf rev = STRBUF_INIT;
502         unsigned long config_size;
503         char *config = NULL;
504         unsigned char sha1[20];
505         enum object_type type;
506         const struct submodule *submodule = NULL;
507         struct parse_config_parameter parameter;
508
509         /*
510          * If any parameter except the cache is a NULL pointer just
511          * return the first submodule. Can be used to check whether
512          * there are any submodules parsed.
513          */
514         if (!treeish_name || !key) {
515                 struct hashmap_iter iter;
516                 struct submodule_entry *entry;
517
518                 entry = hashmap_iter_first(&cache->for_name, &iter);
519                 if (!entry)
520                         return NULL;
521                 return entry->config;
522         }
523
524         if (!gitmodule_sha1_from_commit(treeish_name, sha1, &rev))
525                 goto out;
526
527         switch (lookup_type) {
528         case lookup_name:
529                 submodule = cache_lookup_name(cache, sha1, key);
530                 break;
531         case lookup_path:
532                 submodule = cache_lookup_path(cache, sha1, key);
533                 break;
534         }
535         if (submodule)
536                 goto out;
537
538         config = read_sha1_file(sha1, &type, &config_size);
539         if (!config || type != OBJ_BLOB)
540                 goto out;
541
542         /* fill the submodule config into the cache */
543         parameter.cache = cache;
544         parameter.treeish_name = treeish_name;
545         parameter.gitmodules_sha1 = sha1;
546         parameter.overwrite = 0;
547         git_config_from_mem(parse_config, CONFIG_ORIGIN_SUBMODULE_BLOB, rev.buf,
548                         config, config_size, &parameter);
549         strbuf_release(&rev);
550         free(config);
551
552         switch (lookup_type) {
553         case lookup_name:
554                 return cache_lookup_name(cache, sha1, key);
555         case lookup_path:
556                 return cache_lookup_path(cache, sha1, key);
557         default:
558                 return NULL;
559         }
560
561 out:
562         strbuf_release(&rev);
563         free(config);
564         return submodule;
565 }
566
567 static void submodule_cache_check_init(struct repository *repo)
568 {
569         if (repo->submodule_cache && repo->submodule_cache->initialized)
570                 return;
571
572         if (!repo->submodule_cache)
573                 repo->submodule_cache = submodule_cache_alloc();
574
575         submodule_cache_init(repo->submodule_cache);
576 }
577
578 int submodule_config_option(struct repository *repo,
579                             const char *var, const char *value)
580 {
581         struct parse_config_parameter parameter;
582
583         submodule_cache_check_init(repo);
584
585         parameter.cache = repo->submodule_cache;
586         parameter.treeish_name = NULL;
587         parameter.gitmodules_sha1 = null_sha1;
588         parameter.overwrite = 1;
589
590         return parse_config(var, value, &parameter);
591 }
592
593 int parse_submodule_config_option(const char *var, const char *value)
594 {
595         return submodule_config_option(the_repository, var, value);
596 }
597
598 const struct submodule *submodule_from_name(const unsigned char *treeish_name,
599                 const char *name)
600 {
601         submodule_cache_check_init(the_repository);
602         return config_from(the_repository->submodule_cache, treeish_name, name, lookup_name);
603 }
604
605 const struct submodule *submodule_from_path(const unsigned char *treeish_name,
606                 const char *path)
607 {
608         submodule_cache_check_init(the_repository);
609         return config_from(the_repository->submodule_cache, treeish_name, path, lookup_path);
610 }
611
612 const struct submodule *submodule_from_cache(struct repository *repo,
613                                              const unsigned char *treeish_name,
614                                              const char *key)
615 {
616         submodule_cache_check_init(repo);
617         return config_from(repo->submodule_cache, treeish_name,
618                            key, lookup_path);
619 }
620
621 void submodule_free(void)
622 {
623         if (the_repository->submodule_cache)
624                 submodule_cache_clear(the_repository->submodule_cache);
625 }