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1 | #define NO_THE_INDEX_COMPATIBILITY_MACROS | |
2 | #include "cache.h" | |
3 | #include "argv-array.h" | |
4 | #include "repository.h" | |
5 | #include "config.h" | |
6 | #include "dir.h" | |
7 | #include "tree.h" | |
8 | #include "tree-walk.h" | |
9 | #include "cache-tree.h" | |
10 | #include "unpack-trees.h" | |
11 | #include "progress.h" | |
12 | #include "refs.h" | |
13 | #include "attr.h" | |
14 | #include "split-index.h" | |
15 | #include "dir.h" | |
16 | #include "submodule.h" | |
17 | #include "submodule-config.h" | |
18 | #include "fsmonitor.h" | |
19 | #include "object-store.h" | |
20 | #include "fetch-object.h" | |
21 | ||
22 | /* | |
23 | * Error messages expected by scripts out of plumbing commands such as | |
24 | * read-tree. Non-scripted Porcelain is not required to use these messages | |
25 | * and in fact are encouraged to reword them to better suit their particular | |
26 | * situation better. See how "git checkout" and "git merge" replaces | |
27 | * them using setup_unpack_trees_porcelain(), for example. | |
28 | */ | |
29 | static const char *unpack_plumbing_errors[NB_UNPACK_TREES_ERROR_TYPES] = { | |
30 | /* ERROR_WOULD_OVERWRITE */ | |
31 | "Entry '%s' would be overwritten by merge. Cannot merge.", | |
32 | ||
33 | /* ERROR_NOT_UPTODATE_FILE */ | |
34 | "Entry '%s' not uptodate. Cannot merge.", | |
35 | ||
36 | /* ERROR_NOT_UPTODATE_DIR */ | |
37 | "Updating '%s' would lose untracked files in it", | |
38 | ||
39 | /* ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN */ | |
40 | "Untracked working tree file '%s' would be overwritten by merge.", | |
41 | ||
42 | /* ERROR_WOULD_LOSE_UNTRACKED_REMOVED */ | |
43 | "Untracked working tree file '%s' would be removed by merge.", | |
44 | ||
45 | /* ERROR_BIND_OVERLAP */ | |
46 | "Entry '%s' overlaps with '%s'. Cannot bind.", | |
47 | ||
48 | /* ERROR_SPARSE_NOT_UPTODATE_FILE */ | |
49 | "Entry '%s' not uptodate. Cannot update sparse checkout.", | |
50 | ||
51 | /* ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN */ | |
52 | "Working tree file '%s' would be overwritten by sparse checkout update.", | |
53 | ||
54 | /* ERROR_WOULD_LOSE_ORPHANED_REMOVED */ | |
55 | "Working tree file '%s' would be removed by sparse checkout update.", | |
56 | ||
57 | /* ERROR_WOULD_LOSE_SUBMODULE */ | |
58 | "Submodule '%s' cannot checkout new HEAD.", | |
59 | }; | |
60 | ||
61 | #define ERRORMSG(o,type) \ | |
62 | ( ((o) && (o)->msgs[(type)]) \ | |
63 | ? ((o)->msgs[(type)]) \ | |
64 | : (unpack_plumbing_errors[(type)]) ) | |
65 | ||
66 | static const char *super_prefixed(const char *path) | |
67 | { | |
68 | /* | |
69 | * It is necessary and sufficient to have two static buffers | |
70 | * here, as the return value of this function is fed to | |
71 | * error() using the unpack_*_errors[] templates we see above. | |
72 | */ | |
73 | static struct strbuf buf[2] = {STRBUF_INIT, STRBUF_INIT}; | |
74 | static int super_prefix_len = -1; | |
75 | static unsigned idx = ARRAY_SIZE(buf) - 1; | |
76 | ||
77 | if (super_prefix_len < 0) { | |
78 | const char *super_prefix = get_super_prefix(); | |
79 | if (!super_prefix) { | |
80 | super_prefix_len = 0; | |
81 | } else { | |
82 | int i; | |
83 | for (i = 0; i < ARRAY_SIZE(buf); i++) | |
84 | strbuf_addstr(&buf[i], super_prefix); | |
85 | super_prefix_len = buf[0].len; | |
86 | } | |
87 | } | |
88 | ||
89 | if (!super_prefix_len) | |
90 | return path; | |
91 | ||
92 | if (++idx >= ARRAY_SIZE(buf)) | |
93 | idx = 0; | |
94 | ||
95 | strbuf_setlen(&buf[idx], super_prefix_len); | |
96 | strbuf_addstr(&buf[idx], path); | |
97 | ||
98 | return buf[idx].buf; | |
99 | } | |
100 | ||
101 | void setup_unpack_trees_porcelain(struct unpack_trees_options *opts, | |
102 | const char *cmd) | |
103 | { | |
104 | int i; | |
105 | const char **msgs = opts->msgs; | |
106 | const char *msg; | |
107 | ||
108 | argv_array_init(&opts->msgs_to_free); | |
109 | ||
110 | if (!strcmp(cmd, "checkout")) | |
111 | msg = advice_commit_before_merge | |
112 | ? _("Your local changes to the following files would be overwritten by checkout:\n%%s" | |
113 | "Please commit your changes or stash them before you switch branches.") | |
114 | : _("Your local changes to the following files would be overwritten by checkout:\n%%s"); | |
115 | else if (!strcmp(cmd, "merge")) | |
116 | msg = advice_commit_before_merge | |
117 | ? _("Your local changes to the following files would be overwritten by merge:\n%%s" | |
118 | "Please commit your changes or stash them before you merge.") | |
119 | : _("Your local changes to the following files would be overwritten by merge:\n%%s"); | |
120 | else | |
121 | msg = advice_commit_before_merge | |
122 | ? _("Your local changes to the following files would be overwritten by %s:\n%%s" | |
123 | "Please commit your changes or stash them before you %s.") | |
124 | : _("Your local changes to the following files would be overwritten by %s:\n%%s"); | |
125 | msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] = | |
126 | argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); | |
127 | ||
128 | msgs[ERROR_NOT_UPTODATE_DIR] = | |
129 | _("Updating the following directories would lose untracked files in them:\n%s"); | |
130 | ||
131 | if (!strcmp(cmd, "checkout")) | |
132 | msg = advice_commit_before_merge | |
133 | ? _("The following untracked working tree files would be removed by checkout:\n%%s" | |
134 | "Please move or remove them before you switch branches.") | |
135 | : _("The following untracked working tree files would be removed by checkout:\n%%s"); | |
136 | else if (!strcmp(cmd, "merge")) | |
137 | msg = advice_commit_before_merge | |
138 | ? _("The following untracked working tree files would be removed by merge:\n%%s" | |
139 | "Please move or remove them before you merge.") | |
140 | : _("The following untracked working tree files would be removed by merge:\n%%s"); | |
141 | else | |
142 | msg = advice_commit_before_merge | |
143 | ? _("The following untracked working tree files would be removed by %s:\n%%s" | |
144 | "Please move or remove them before you %s.") | |
145 | : _("The following untracked working tree files would be removed by %s:\n%%s"); | |
146 | msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = | |
147 | argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); | |
148 | ||
149 | if (!strcmp(cmd, "checkout")) | |
150 | msg = advice_commit_before_merge | |
151 | ? _("The following untracked working tree files would be overwritten by checkout:\n%%s" | |
152 | "Please move or remove them before you switch branches.") | |
153 | : _("The following untracked working tree files would be overwritten by checkout:\n%%s"); | |
154 | else if (!strcmp(cmd, "merge")) | |
155 | msg = advice_commit_before_merge | |
156 | ? _("The following untracked working tree files would be overwritten by merge:\n%%s" | |
157 | "Please move or remove them before you merge.") | |
158 | : _("The following untracked working tree files would be overwritten by merge:\n%%s"); | |
159 | else | |
160 | msg = advice_commit_before_merge | |
161 | ? _("The following untracked working tree files would be overwritten by %s:\n%%s" | |
162 | "Please move or remove them before you %s.") | |
163 | : _("The following untracked working tree files would be overwritten by %s:\n%%s"); | |
164 | msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = | |
165 | argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); | |
166 | ||
167 | /* | |
168 | * Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we | |
169 | * cannot easily display it as a list. | |
170 | */ | |
171 | msgs[ERROR_BIND_OVERLAP] = _("Entry '%s' overlaps with '%s'. Cannot bind."); | |
172 | ||
173 | msgs[ERROR_SPARSE_NOT_UPTODATE_FILE] = | |
174 | _("Cannot update sparse checkout: the following entries are not up to date:\n%s"); | |
175 | msgs[ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN] = | |
176 | _("The following working tree files would be overwritten by sparse checkout update:\n%s"); | |
177 | msgs[ERROR_WOULD_LOSE_ORPHANED_REMOVED] = | |
178 | _("The following working tree files would be removed by sparse checkout update:\n%s"); | |
179 | msgs[ERROR_WOULD_LOSE_SUBMODULE] = | |
180 | _("Cannot update submodule:\n%s"); | |
181 | ||
182 | opts->show_all_errors = 1; | |
183 | /* rejected paths may not have a static buffer */ | |
184 | for (i = 0; i < ARRAY_SIZE(opts->unpack_rejects); i++) | |
185 | opts->unpack_rejects[i].strdup_strings = 1; | |
186 | } | |
187 | ||
188 | void clear_unpack_trees_porcelain(struct unpack_trees_options *opts) | |
189 | { | |
190 | argv_array_clear(&opts->msgs_to_free); | |
191 | memset(opts->msgs, 0, sizeof(opts->msgs)); | |
192 | } | |
193 | ||
194 | static int do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce, | |
195 | unsigned int set, unsigned int clear) | |
196 | { | |
197 | clear |= CE_HASHED; | |
198 | ||
199 | if (set & CE_REMOVE) | |
200 | set |= CE_WT_REMOVE; | |
201 | ||
202 | ce->ce_flags = (ce->ce_flags & ~clear) | set; | |
203 | return add_index_entry(&o->result, ce, | |
204 | ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE); | |
205 | } | |
206 | ||
207 | static void add_entry(struct unpack_trees_options *o, | |
208 | const struct cache_entry *ce, | |
209 | unsigned int set, unsigned int clear) | |
210 | { | |
211 | do_add_entry(o, dup_cache_entry(ce, &o->result), set, clear); | |
212 | } | |
213 | ||
214 | /* | |
215 | * add error messages on path <path> | |
216 | * corresponding to the type <e> with the message <msg> | |
217 | * indicating if it should be display in porcelain or not | |
218 | */ | |
219 | static int add_rejected_path(struct unpack_trees_options *o, | |
220 | enum unpack_trees_error_types e, | |
221 | const char *path) | |
222 | { | |
223 | if (!o->show_all_errors) | |
224 | return error(ERRORMSG(o, e), super_prefixed(path)); | |
225 | ||
226 | /* | |
227 | * Otherwise, insert in a list for future display by | |
228 | * display_error_msgs() | |
229 | */ | |
230 | string_list_append(&o->unpack_rejects[e], path); | |
231 | return -1; | |
232 | } | |
233 | ||
234 | /* | |
235 | * display all the error messages stored in a nice way | |
236 | */ | |
237 | static void display_error_msgs(struct unpack_trees_options *o) | |
238 | { | |
239 | int e, i; | |
240 | int something_displayed = 0; | |
241 | for (e = 0; e < NB_UNPACK_TREES_ERROR_TYPES; e++) { | |
242 | struct string_list *rejects = &o->unpack_rejects[e]; | |
243 | if (rejects->nr > 0) { | |
244 | struct strbuf path = STRBUF_INIT; | |
245 | something_displayed = 1; | |
246 | for (i = 0; i < rejects->nr; i++) | |
247 | strbuf_addf(&path, "\t%s\n", rejects->items[i].string); | |
248 | error(ERRORMSG(o, e), super_prefixed(path.buf)); | |
249 | strbuf_release(&path); | |
250 | } | |
251 | string_list_clear(rejects, 0); | |
252 | } | |
253 | if (something_displayed) | |
254 | fprintf(stderr, _("Aborting\n")); | |
255 | } | |
256 | ||
257 | static int check_submodule_move_head(const struct cache_entry *ce, | |
258 | const char *old_id, | |
259 | const char *new_id, | |
260 | struct unpack_trees_options *o) | |
261 | { | |
262 | unsigned flags = SUBMODULE_MOVE_HEAD_DRY_RUN; | |
263 | const struct submodule *sub = submodule_from_ce(ce); | |
264 | ||
265 | if (!sub) | |
266 | return 0; | |
267 | ||
268 | if (o->reset) | |
269 | flags |= SUBMODULE_MOVE_HEAD_FORCE; | |
270 | ||
271 | if (submodule_move_head(ce->name, old_id, new_id, flags)) | |
272 | return o->gently ? -1 : | |
273 | add_rejected_path(o, ERROR_WOULD_LOSE_SUBMODULE, ce->name); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Preform the loading of the repository's gitmodules file. This function is | |
279 | * used by 'check_update()' to perform loading of the gitmodules file in two | |
280 | * differnt situations: | |
281 | * (1) before removing entries from the working tree if the gitmodules file has | |
282 | * been marked for removal. This situation is specified by 'state' == NULL. | |
283 | * (2) before checking out entries to the working tree if the gitmodules file | |
284 | * has been marked for update. This situation is specified by 'state' != NULL. | |
285 | */ | |
286 | static void load_gitmodules_file(struct index_state *index, | |
287 | struct checkout *state) | |
288 | { | |
289 | int pos = index_name_pos(index, GITMODULES_FILE, strlen(GITMODULES_FILE)); | |
290 | ||
291 | if (pos >= 0) { | |
292 | struct cache_entry *ce = index->cache[pos]; | |
293 | if (!state && ce->ce_flags & CE_WT_REMOVE) { | |
294 | repo_read_gitmodules(the_repository); | |
295 | } else if (state && (ce->ce_flags & CE_UPDATE)) { | |
296 | submodule_free(the_repository); | |
297 | checkout_entry(ce, state, NULL); | |
298 | repo_read_gitmodules(the_repository); | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
303 | /* | |
304 | * Unlink the last component and schedule the leading directories for | |
305 | * removal, such that empty directories get removed. | |
306 | */ | |
307 | static void unlink_entry(const struct cache_entry *ce) | |
308 | { | |
309 | const struct submodule *sub = submodule_from_ce(ce); | |
310 | if (sub) { | |
311 | /* state.force is set at the caller. */ | |
312 | submodule_move_head(ce->name, "HEAD", NULL, | |
313 | SUBMODULE_MOVE_HEAD_FORCE); | |
314 | } | |
315 | if (!check_leading_path(ce->name, ce_namelen(ce))) | |
316 | return; | |
317 | if (remove_or_warn(ce->ce_mode, ce->name)) | |
318 | return; | |
319 | schedule_dir_for_removal(ce->name, ce_namelen(ce)); | |
320 | } | |
321 | ||
322 | static struct progress *get_progress(struct unpack_trees_options *o) | |
323 | { | |
324 | unsigned cnt = 0, total = 0; | |
325 | struct index_state *index = &o->result; | |
326 | ||
327 | if (!o->update || !o->verbose_update) | |
328 | return NULL; | |
329 | ||
330 | for (; cnt < index->cache_nr; cnt++) { | |
331 | const struct cache_entry *ce = index->cache[cnt]; | |
332 | if (ce->ce_flags & (CE_UPDATE | CE_WT_REMOVE)) | |
333 | total++; | |
334 | } | |
335 | ||
336 | return start_delayed_progress(_("Checking out files"), total); | |
337 | } | |
338 | ||
339 | static int check_updates(struct unpack_trees_options *o) | |
340 | { | |
341 | unsigned cnt = 0; | |
342 | int errs = 0; | |
343 | struct progress *progress = NULL; | |
344 | struct index_state *index = &o->result; | |
345 | struct checkout state = CHECKOUT_INIT; | |
346 | int i; | |
347 | ||
348 | state.force = 1; | |
349 | state.quiet = 1; | |
350 | state.refresh_cache = 1; | |
351 | state.istate = index; | |
352 | ||
353 | progress = get_progress(o); | |
354 | ||
355 | if (o->update) | |
356 | git_attr_set_direction(GIT_ATTR_CHECKOUT, index); | |
357 | ||
358 | if (should_update_submodules() && o->update && !o->dry_run) | |
359 | load_gitmodules_file(index, NULL); | |
360 | ||
361 | for (i = 0; i < index->cache_nr; i++) { | |
362 | const struct cache_entry *ce = index->cache[i]; | |
363 | ||
364 | if (ce->ce_flags & CE_WT_REMOVE) { | |
365 | display_progress(progress, ++cnt); | |
366 | if (o->update && !o->dry_run) | |
367 | unlink_entry(ce); | |
368 | } | |
369 | } | |
370 | remove_marked_cache_entries(index); | |
371 | remove_scheduled_dirs(); | |
372 | ||
373 | if (should_update_submodules() && o->update && !o->dry_run) | |
374 | load_gitmodules_file(index, &state); | |
375 | ||
376 | enable_delayed_checkout(&state); | |
377 | if (repository_format_partial_clone && o->update && !o->dry_run) { | |
378 | /* | |
379 | * Prefetch the objects that are to be checked out in the loop | |
380 | * below. | |
381 | */ | |
382 | struct oid_array to_fetch = OID_ARRAY_INIT; | |
383 | int fetch_if_missing_store = fetch_if_missing; | |
384 | fetch_if_missing = 0; | |
385 | for (i = 0; i < index->cache_nr; i++) { | |
386 | struct cache_entry *ce = index->cache[i]; | |
387 | if ((ce->ce_flags & CE_UPDATE) && | |
388 | !S_ISGITLINK(ce->ce_mode)) { | |
389 | if (!has_object_file(&ce->oid)) | |
390 | oid_array_append(&to_fetch, &ce->oid); | |
391 | } | |
392 | } | |
393 | if (to_fetch.nr) | |
394 | fetch_objects(repository_format_partial_clone, | |
395 | &to_fetch); | |
396 | fetch_if_missing = fetch_if_missing_store; | |
397 | oid_array_clear(&to_fetch); | |
398 | } | |
399 | for (i = 0; i < index->cache_nr; i++) { | |
400 | struct cache_entry *ce = index->cache[i]; | |
401 | ||
402 | if (ce->ce_flags & CE_UPDATE) { | |
403 | if (ce->ce_flags & CE_WT_REMOVE) | |
404 | BUG("both update and delete flags are set on %s", | |
405 | ce->name); | |
406 | display_progress(progress, ++cnt); | |
407 | ce->ce_flags &= ~CE_UPDATE; | |
408 | if (o->update && !o->dry_run) { | |
409 | errs |= checkout_entry(ce, &state, NULL); | |
410 | } | |
411 | } | |
412 | } | |
413 | stop_progress(&progress); | |
414 | errs |= finish_delayed_checkout(&state); | |
415 | if (o->update) | |
416 | git_attr_set_direction(GIT_ATTR_CHECKIN, NULL); | |
417 | return errs != 0; | |
418 | } | |
419 | ||
420 | static int verify_uptodate_sparse(const struct cache_entry *ce, | |
421 | struct unpack_trees_options *o); | |
422 | static int verify_absent_sparse(const struct cache_entry *ce, | |
423 | enum unpack_trees_error_types, | |
424 | struct unpack_trees_options *o); | |
425 | ||
426 | static int apply_sparse_checkout(struct index_state *istate, | |
427 | struct cache_entry *ce, | |
428 | struct unpack_trees_options *o) | |
429 | { | |
430 | int was_skip_worktree = ce_skip_worktree(ce); | |
431 | ||
432 | if (ce->ce_flags & CE_NEW_SKIP_WORKTREE) | |
433 | ce->ce_flags |= CE_SKIP_WORKTREE; | |
434 | else | |
435 | ce->ce_flags &= ~CE_SKIP_WORKTREE; | |
436 | if (was_skip_worktree != ce_skip_worktree(ce)) { | |
437 | ce->ce_flags |= CE_UPDATE_IN_BASE; | |
438 | mark_fsmonitor_invalid(istate, ce); | |
439 | istate->cache_changed |= CE_ENTRY_CHANGED; | |
440 | } | |
441 | ||
442 | /* | |
443 | * if (!was_skip_worktree && !ce_skip_worktree()) { | |
444 | * This is perfectly normal. Move on; | |
445 | * } | |
446 | */ | |
447 | ||
448 | /* | |
449 | * Merge strategies may set CE_UPDATE|CE_REMOVE outside checkout | |
450 | * area as a result of ce_skip_worktree() shortcuts in | |
451 | * verify_absent() and verify_uptodate(). | |
452 | * Make sure they don't modify worktree if they are already | |
453 | * outside checkout area | |
454 | */ | |
455 | if (was_skip_worktree && ce_skip_worktree(ce)) { | |
456 | ce->ce_flags &= ~CE_UPDATE; | |
457 | ||
458 | /* | |
459 | * By default, when CE_REMOVE is on, CE_WT_REMOVE is also | |
460 | * on to get that file removed from both index and worktree. | |
461 | * If that file is already outside worktree area, don't | |
462 | * bother remove it. | |
463 | */ | |
464 | if (ce->ce_flags & CE_REMOVE) | |
465 | ce->ce_flags &= ~CE_WT_REMOVE; | |
466 | } | |
467 | ||
468 | if (!was_skip_worktree && ce_skip_worktree(ce)) { | |
469 | /* | |
470 | * If CE_UPDATE is set, verify_uptodate() must be called already | |
471 | * also stat info may have lost after merged_entry() so calling | |
472 | * verify_uptodate() again may fail | |
473 | */ | |
474 | if (!(ce->ce_flags & CE_UPDATE) && verify_uptodate_sparse(ce, o)) | |
475 | return -1; | |
476 | ce->ce_flags |= CE_WT_REMOVE; | |
477 | ce->ce_flags &= ~CE_UPDATE; | |
478 | } | |
479 | if (was_skip_worktree && !ce_skip_worktree(ce)) { | |
480 | if (verify_absent_sparse(ce, ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) | |
481 | return -1; | |
482 | ce->ce_flags |= CE_UPDATE; | |
483 | } | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static inline int call_unpack_fn(const struct cache_entry * const *src, | |
488 | struct unpack_trees_options *o) | |
489 | { | |
490 | int ret = o->fn(src, o); | |
491 | if (ret > 0) | |
492 | ret = 0; | |
493 | return ret; | |
494 | } | |
495 | ||
496 | static void mark_ce_used(struct cache_entry *ce, struct unpack_trees_options *o) | |
497 | { | |
498 | ce->ce_flags |= CE_UNPACKED; | |
499 | ||
500 | if (o->cache_bottom < o->src_index->cache_nr && | |
501 | o->src_index->cache[o->cache_bottom] == ce) { | |
502 | int bottom = o->cache_bottom; | |
503 | while (bottom < o->src_index->cache_nr && | |
504 | o->src_index->cache[bottom]->ce_flags & CE_UNPACKED) | |
505 | bottom++; | |
506 | o->cache_bottom = bottom; | |
507 | } | |
508 | } | |
509 | ||
510 | static void mark_all_ce_unused(struct index_state *index) | |
511 | { | |
512 | int i; | |
513 | for (i = 0; i < index->cache_nr; i++) | |
514 | index->cache[i]->ce_flags &= ~(CE_UNPACKED | CE_ADDED | CE_NEW_SKIP_WORKTREE); | |
515 | } | |
516 | ||
517 | static int locate_in_src_index(const struct cache_entry *ce, | |
518 | struct unpack_trees_options *o) | |
519 | { | |
520 | struct index_state *index = o->src_index; | |
521 | int len = ce_namelen(ce); | |
522 | int pos = index_name_pos(index, ce->name, len); | |
523 | if (pos < 0) | |
524 | pos = -1 - pos; | |
525 | return pos; | |
526 | } | |
527 | ||
528 | /* | |
529 | * We call unpack_index_entry() with an unmerged cache entry | |
530 | * only in diff-index, and it wants a single callback. Skip | |
531 | * the other unmerged entry with the same name. | |
532 | */ | |
533 | static void mark_ce_used_same_name(struct cache_entry *ce, | |
534 | struct unpack_trees_options *o) | |
535 | { | |
536 | struct index_state *index = o->src_index; | |
537 | int len = ce_namelen(ce); | |
538 | int pos; | |
539 | ||
540 | for (pos = locate_in_src_index(ce, o); pos < index->cache_nr; pos++) { | |
541 | struct cache_entry *next = index->cache[pos]; | |
542 | if (len != ce_namelen(next) || | |
543 | memcmp(ce->name, next->name, len)) | |
544 | break; | |
545 | mark_ce_used(next, o); | |
546 | } | |
547 | } | |
548 | ||
549 | static struct cache_entry *next_cache_entry(struct unpack_trees_options *o) | |
550 | { | |
551 | const struct index_state *index = o->src_index; | |
552 | int pos = o->cache_bottom; | |
553 | ||
554 | while (pos < index->cache_nr) { | |
555 | struct cache_entry *ce = index->cache[pos]; | |
556 | if (!(ce->ce_flags & CE_UNPACKED)) | |
557 | return ce; | |
558 | pos++; | |
559 | } | |
560 | return NULL; | |
561 | } | |
562 | ||
563 | static void add_same_unmerged(const struct cache_entry *ce, | |
564 | struct unpack_trees_options *o) | |
565 | { | |
566 | struct index_state *index = o->src_index; | |
567 | int len = ce_namelen(ce); | |
568 | int pos = index_name_pos(index, ce->name, len); | |
569 | ||
570 | if (0 <= pos) | |
571 | die("programming error in a caller of mark_ce_used_same_name"); | |
572 | for (pos = -pos - 1; pos < index->cache_nr; pos++) { | |
573 | struct cache_entry *next = index->cache[pos]; | |
574 | if (len != ce_namelen(next) || | |
575 | memcmp(ce->name, next->name, len)) | |
576 | break; | |
577 | add_entry(o, next, 0, 0); | |
578 | mark_ce_used(next, o); | |
579 | } | |
580 | } | |
581 | ||
582 | static int unpack_index_entry(struct cache_entry *ce, | |
583 | struct unpack_trees_options *o) | |
584 | { | |
585 | const struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, }; | |
586 | int ret; | |
587 | ||
588 | src[0] = ce; | |
589 | ||
590 | mark_ce_used(ce, o); | |
591 | if (ce_stage(ce)) { | |
592 | if (o->skip_unmerged) { | |
593 | add_entry(o, ce, 0, 0); | |
594 | return 0; | |
595 | } | |
596 | } | |
597 | ret = call_unpack_fn(src, o); | |
598 | if (ce_stage(ce)) | |
599 | mark_ce_used_same_name(ce, o); | |
600 | return ret; | |
601 | } | |
602 | ||
603 | static int find_cache_pos(struct traverse_info *, const struct name_entry *); | |
604 | ||
605 | static void restore_cache_bottom(struct traverse_info *info, int bottom) | |
606 | { | |
607 | struct unpack_trees_options *o = info->data; | |
608 | ||
609 | if (o->diff_index_cached) | |
610 | return; | |
611 | o->cache_bottom = bottom; | |
612 | } | |
613 | ||
614 | static int switch_cache_bottom(struct traverse_info *info) | |
615 | { | |
616 | struct unpack_trees_options *o = info->data; | |
617 | int ret, pos; | |
618 | ||
619 | if (o->diff_index_cached) | |
620 | return 0; | |
621 | ret = o->cache_bottom; | |
622 | pos = find_cache_pos(info->prev, &info->name); | |
623 | ||
624 | if (pos < -1) | |
625 | o->cache_bottom = -2 - pos; | |
626 | else if (pos < 0) | |
627 | o->cache_bottom = o->src_index->cache_nr; | |
628 | return ret; | |
629 | } | |
630 | ||
631 | static inline int are_same_oid(struct name_entry *name_j, struct name_entry *name_k) | |
632 | { | |
633 | return name_j->oid && name_k->oid && !oidcmp(name_j->oid, name_k->oid); | |
634 | } | |
635 | ||
636 | static int traverse_trees_recursive(int n, unsigned long dirmask, | |
637 | unsigned long df_conflicts, | |
638 | struct name_entry *names, | |
639 | struct traverse_info *info) | |
640 | { | |
641 | int i, ret, bottom; | |
642 | int nr_buf = 0; | |
643 | struct tree_desc t[MAX_UNPACK_TREES]; | |
644 | void *buf[MAX_UNPACK_TREES]; | |
645 | struct traverse_info newinfo; | |
646 | struct name_entry *p; | |
647 | ||
648 | p = names; | |
649 | while (!p->mode) | |
650 | p++; | |
651 | ||
652 | newinfo = *info; | |
653 | newinfo.prev = info; | |
654 | newinfo.pathspec = info->pathspec; | |
655 | newinfo.name = *p; | |
656 | newinfo.pathlen += tree_entry_len(p) + 1; | |
657 | newinfo.df_conflicts |= df_conflicts; | |
658 | ||
659 | /* | |
660 | * Fetch the tree from the ODB for each peer directory in the | |
661 | * n commits. | |
662 | * | |
663 | * For 2- and 3-way traversals, we try to avoid hitting the | |
664 | * ODB twice for the same OID. This should yield a nice speed | |
665 | * up in checkouts and merges when the commits are similar. | |
666 | * | |
667 | * We don't bother doing the full O(n^2) search for larger n, | |
668 | * because wider traversals don't happen that often and we | |
669 | * avoid the search setup. | |
670 | * | |
671 | * When 2 peer OIDs are the same, we just copy the tree | |
672 | * descriptor data. This implicitly borrows the buffer | |
673 | * data from the earlier cell. | |
674 | */ | |
675 | for (i = 0; i < n; i++, dirmask >>= 1) { | |
676 | if (i > 0 && are_same_oid(&names[i], &names[i - 1])) | |
677 | t[i] = t[i - 1]; | |
678 | else if (i > 1 && are_same_oid(&names[i], &names[i - 2])) | |
679 | t[i] = t[i - 2]; | |
680 | else { | |
681 | const struct object_id *oid = NULL; | |
682 | if (dirmask & 1) | |
683 | oid = names[i].oid; | |
684 | buf[nr_buf++] = fill_tree_descriptor(t + i, oid); | |
685 | } | |
686 | } | |
687 | ||
688 | bottom = switch_cache_bottom(&newinfo); | |
689 | ret = traverse_trees(n, t, &newinfo); | |
690 | restore_cache_bottom(&newinfo, bottom); | |
691 | ||
692 | for (i = 0; i < nr_buf; i++) | |
693 | free(buf[i]); | |
694 | ||
695 | return ret; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Compare the traverse-path to the cache entry without actually | |
700 | * having to generate the textual representation of the traverse | |
701 | * path. | |
702 | * | |
703 | * NOTE! This *only* compares up to the size of the traverse path | |
704 | * itself - the caller needs to do the final check for the cache | |
705 | * entry having more data at the end! | |
706 | */ | |
707 | static int do_compare_entry_piecewise(const struct cache_entry *ce, const struct traverse_info *info, const struct name_entry *n) | |
708 | { | |
709 | int len, pathlen, ce_len; | |
710 | const char *ce_name; | |
711 | ||
712 | if (info->prev) { | |
713 | int cmp = do_compare_entry_piecewise(ce, info->prev, | |
714 | &info->name); | |
715 | if (cmp) | |
716 | return cmp; | |
717 | } | |
718 | pathlen = info->pathlen; | |
719 | ce_len = ce_namelen(ce); | |
720 | ||
721 | /* If ce_len < pathlen then we must have previously hit "name == directory" entry */ | |
722 | if (ce_len < pathlen) | |
723 | return -1; | |
724 | ||
725 | ce_len -= pathlen; | |
726 | ce_name = ce->name + pathlen; | |
727 | ||
728 | len = tree_entry_len(n); | |
729 | return df_name_compare(ce_name, ce_len, S_IFREG, n->path, len, n->mode); | |
730 | } | |
731 | ||
732 | static int do_compare_entry(const struct cache_entry *ce, | |
733 | const struct traverse_info *info, | |
734 | const struct name_entry *n) | |
735 | { | |
736 | int len, pathlen, ce_len; | |
737 | const char *ce_name; | |
738 | int cmp; | |
739 | ||
740 | /* | |
741 | * If we have not precomputed the traverse path, it is quicker | |
742 | * to avoid doing so. But if we have precomputed it, | |
743 | * it is quicker to use the precomputed version. | |
744 | */ | |
745 | if (!info->traverse_path) | |
746 | return do_compare_entry_piecewise(ce, info, n); | |
747 | ||
748 | cmp = strncmp(ce->name, info->traverse_path, info->pathlen); | |
749 | if (cmp) | |
750 | return cmp; | |
751 | ||
752 | pathlen = info->pathlen; | |
753 | ce_len = ce_namelen(ce); | |
754 | ||
755 | if (ce_len < pathlen) | |
756 | return -1; | |
757 | ||
758 | ce_len -= pathlen; | |
759 | ce_name = ce->name + pathlen; | |
760 | ||
761 | len = tree_entry_len(n); | |
762 | return df_name_compare(ce_name, ce_len, S_IFREG, n->path, len, n->mode); | |
763 | } | |
764 | ||
765 | static int compare_entry(const struct cache_entry *ce, const struct traverse_info *info, const struct name_entry *n) | |
766 | { | |
767 | int cmp = do_compare_entry(ce, info, n); | |
768 | if (cmp) | |
769 | return cmp; | |
770 | ||
771 | /* | |
772 | * Even if the beginning compared identically, the ce should | |
773 | * compare as bigger than a directory leading up to it! | |
774 | */ | |
775 | return ce_namelen(ce) > traverse_path_len(info, n); | |
776 | } | |
777 | ||
778 | static int ce_in_traverse_path(const struct cache_entry *ce, | |
779 | const struct traverse_info *info) | |
780 | { | |
781 | if (!info->prev) | |
782 | return 1; | |
783 | if (do_compare_entry(ce, info->prev, &info->name)) | |
784 | return 0; | |
785 | /* | |
786 | * If ce (blob) is the same name as the path (which is a tree | |
787 | * we will be descending into), it won't be inside it. | |
788 | */ | |
789 | return (info->pathlen < ce_namelen(ce)); | |
790 | } | |
791 | ||
792 | static struct cache_entry *create_ce_entry(const struct traverse_info *info, | |
793 | const struct name_entry *n, | |
794 | int stage, | |
795 | struct index_state *istate, | |
796 | int is_transient) | |
797 | { | |
798 | int len = traverse_path_len(info, n); | |
799 | struct cache_entry *ce = | |
800 | is_transient ? | |
801 | make_empty_transient_cache_entry(len) : | |
802 | make_empty_cache_entry(istate, len); | |
803 | ||
804 | ce->ce_mode = create_ce_mode(n->mode); | |
805 | ce->ce_flags = create_ce_flags(stage); | |
806 | ce->ce_namelen = len; | |
807 | oidcpy(&ce->oid, n->oid); | |
808 | make_traverse_path(ce->name, info, n); | |
809 | ||
810 | return ce; | |
811 | } | |
812 | ||
813 | static int unpack_nondirectories(int n, unsigned long mask, | |
814 | unsigned long dirmask, | |
815 | struct cache_entry **src, | |
816 | const struct name_entry *names, | |
817 | const struct traverse_info *info) | |
818 | { | |
819 | int i; | |
820 | struct unpack_trees_options *o = info->data; | |
821 | unsigned long conflicts = info->df_conflicts | dirmask; | |
822 | ||
823 | /* Do we have *only* directories? Nothing to do */ | |
824 | if (mask == dirmask && !src[0]) | |
825 | return 0; | |
826 | ||
827 | /* | |
828 | * Ok, we've filled in up to any potential index entry in src[0], | |
829 | * now do the rest. | |
830 | */ | |
831 | for (i = 0; i < n; i++) { | |
832 | int stage; | |
833 | unsigned int bit = 1ul << i; | |
834 | if (conflicts & bit) { | |
835 | src[i + o->merge] = o->df_conflict_entry; | |
836 | continue; | |
837 | } | |
838 | if (!(mask & bit)) | |
839 | continue; | |
840 | if (!o->merge) | |
841 | stage = 0; | |
842 | else if (i + 1 < o->head_idx) | |
843 | stage = 1; | |
844 | else if (i + 1 > o->head_idx) | |
845 | stage = 3; | |
846 | else | |
847 | stage = 2; | |
848 | ||
849 | /* | |
850 | * If the merge bit is set, then the cache entries are | |
851 | * discarded in the following block. In this case, | |
852 | * construct "transient" cache_entries, as they are | |
853 | * not stored in the index. otherwise construct the | |
854 | * cache entry from the index aware logic. | |
855 | */ | |
856 | src[i + o->merge] = create_ce_entry(info, names + i, stage, &o->result, o->merge); | |
857 | } | |
858 | ||
859 | if (o->merge) { | |
860 | int rc = call_unpack_fn((const struct cache_entry * const *)src, | |
861 | o); | |
862 | for (i = 0; i < n; i++) { | |
863 | struct cache_entry *ce = src[i + o->merge]; | |
864 | if (ce != o->df_conflict_entry) | |
865 | discard_cache_entry(ce); | |
866 | } | |
867 | return rc; | |
868 | } | |
869 | ||
870 | for (i = 0; i < n; i++) | |
871 | if (src[i] && src[i] != o->df_conflict_entry) | |
872 | if (do_add_entry(o, src[i], 0, 0)) | |
873 | return -1; | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | static int unpack_failed(struct unpack_trees_options *o, const char *message) | |
879 | { | |
880 | discard_index(&o->result); | |
881 | if (!o->gently && !o->exiting_early) { | |
882 | if (message) | |
883 | return error("%s", message); | |
884 | return -1; | |
885 | } | |
886 | return -1; | |
887 | } | |
888 | ||
889 | /* | |
890 | * The tree traversal is looking at name p. If we have a matching entry, | |
891 | * return it. If name p is a directory in the index, do not return | |
892 | * anything, as we will want to match it when the traversal descends into | |
893 | * the directory. | |
894 | */ | |
895 | static int find_cache_pos(struct traverse_info *info, | |
896 | const struct name_entry *p) | |
897 | { | |
898 | int pos; | |
899 | struct unpack_trees_options *o = info->data; | |
900 | struct index_state *index = o->src_index; | |
901 | int pfxlen = info->pathlen; | |
902 | int p_len = tree_entry_len(p); | |
903 | ||
904 | for (pos = o->cache_bottom; pos < index->cache_nr; pos++) { | |
905 | const struct cache_entry *ce = index->cache[pos]; | |
906 | const char *ce_name, *ce_slash; | |
907 | int cmp, ce_len; | |
908 | ||
909 | if (ce->ce_flags & CE_UNPACKED) { | |
910 | /* | |
911 | * cache_bottom entry is already unpacked, so | |
912 | * we can never match it; don't check it | |
913 | * again. | |
914 | */ | |
915 | if (pos == o->cache_bottom) | |
916 | ++o->cache_bottom; | |
917 | continue; | |
918 | } | |
919 | if (!ce_in_traverse_path(ce, info)) { | |
920 | /* | |
921 | * Check if we can skip future cache checks | |
922 | * (because we're already past all possible | |
923 | * entries in the traverse path). | |
924 | */ | |
925 | if (info->traverse_path) { | |
926 | if (strncmp(ce->name, info->traverse_path, | |
927 | info->pathlen) > 0) | |
928 | break; | |
929 | } | |
930 | continue; | |
931 | } | |
932 | ce_name = ce->name + pfxlen; | |
933 | ce_slash = strchr(ce_name, '/'); | |
934 | if (ce_slash) | |
935 | ce_len = ce_slash - ce_name; | |
936 | else | |
937 | ce_len = ce_namelen(ce) - pfxlen; | |
938 | cmp = name_compare(p->path, p_len, ce_name, ce_len); | |
939 | /* | |
940 | * Exact match; if we have a directory we need to | |
941 | * delay returning it. | |
942 | */ | |
943 | if (!cmp) | |
944 | return ce_slash ? -2 - pos : pos; | |
945 | if (0 < cmp) | |
946 | continue; /* keep looking */ | |
947 | /* | |
948 | * ce_name sorts after p->path; could it be that we | |
949 | * have files under p->path directory in the index? | |
950 | * E.g. ce_name == "t-i", and p->path == "t"; we may | |
951 | * have "t/a" in the index. | |
952 | */ | |
953 | if (p_len < ce_len && !memcmp(ce_name, p->path, p_len) && | |
954 | ce_name[p_len] < '/') | |
955 | continue; /* keep looking */ | |
956 | break; | |
957 | } | |
958 | return -1; | |
959 | } | |
960 | ||
961 | static struct cache_entry *find_cache_entry(struct traverse_info *info, | |
962 | const struct name_entry *p) | |
963 | { | |
964 | int pos = find_cache_pos(info, p); | |
965 | struct unpack_trees_options *o = info->data; | |
966 | ||
967 | if (0 <= pos) | |
968 | return o->src_index->cache[pos]; | |
969 | else | |
970 | return NULL; | |
971 | } | |
972 | ||
973 | static void debug_path(struct traverse_info *info) | |
974 | { | |
975 | if (info->prev) { | |
976 | debug_path(info->prev); | |
977 | if (*info->prev->name.path) | |
978 | putchar('/'); | |
979 | } | |
980 | printf("%s", info->name.path); | |
981 | } | |
982 | ||
983 | static void debug_name_entry(int i, struct name_entry *n) | |
984 | { | |
985 | printf("ent#%d %06o %s\n", i, | |
986 | n->path ? n->mode : 0, | |
987 | n->path ? n->path : "(missing)"); | |
988 | } | |
989 | ||
990 | static void debug_unpack_callback(int n, | |
991 | unsigned long mask, | |
992 | unsigned long dirmask, | |
993 | struct name_entry *names, | |
994 | struct traverse_info *info) | |
995 | { | |
996 | int i; | |
997 | printf("* unpack mask %lu, dirmask %lu, cnt %d ", | |
998 | mask, dirmask, n); | |
999 | debug_path(info); | |
1000 | putchar('\n'); | |
1001 | for (i = 0; i < n; i++) | |
1002 | debug_name_entry(i, names + i); | |
1003 | } | |
1004 | ||
1005 | static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info) | |
1006 | { | |
1007 | struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, }; | |
1008 | struct unpack_trees_options *o = info->data; | |
1009 | const struct name_entry *p = names; | |
1010 | ||
1011 | /* Find first entry with a real name (we could use "mask" too) */ | |
1012 | while (!p->mode) | |
1013 | p++; | |
1014 | ||
1015 | if (o->debug_unpack) | |
1016 | debug_unpack_callback(n, mask, dirmask, names, info); | |
1017 | ||
1018 | /* Are we supposed to look at the index too? */ | |
1019 | if (o->merge) { | |
1020 | while (1) { | |
1021 | int cmp; | |
1022 | struct cache_entry *ce; | |
1023 | ||
1024 | if (o->diff_index_cached) | |
1025 | ce = next_cache_entry(o); | |
1026 | else | |
1027 | ce = find_cache_entry(info, p); | |
1028 | ||
1029 | if (!ce) | |
1030 | break; | |
1031 | cmp = compare_entry(ce, info, p); | |
1032 | if (cmp < 0) { | |
1033 | if (unpack_index_entry(ce, o) < 0) | |
1034 | return unpack_failed(o, NULL); | |
1035 | continue; | |
1036 | } | |
1037 | if (!cmp) { | |
1038 | if (ce_stage(ce)) { | |
1039 | /* | |
1040 | * If we skip unmerged index | |
1041 | * entries, we'll skip this | |
1042 | * entry *and* the tree | |
1043 | * entries associated with it! | |
1044 | */ | |
1045 | if (o->skip_unmerged) { | |
1046 | add_same_unmerged(ce, o); | |
1047 | return mask; | |
1048 | } | |
1049 | } | |
1050 | src[0] = ce; | |
1051 | } | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | if (unpack_nondirectories(n, mask, dirmask, src, names, info) < 0) | |
1057 | return -1; | |
1058 | ||
1059 | if (o->merge && src[0]) { | |
1060 | if (ce_stage(src[0])) | |
1061 | mark_ce_used_same_name(src[0], o); | |
1062 | else | |
1063 | mark_ce_used(src[0], o); | |
1064 | } | |
1065 | ||
1066 | /* Now handle any directories.. */ | |
1067 | if (dirmask) { | |
1068 | /* special case: "diff-index --cached" looking at a tree */ | |
1069 | if (o->diff_index_cached && | |
1070 | n == 1 && dirmask == 1 && S_ISDIR(names->mode)) { | |
1071 | int matches; | |
1072 | matches = cache_tree_matches_traversal(o->src_index->cache_tree, | |
1073 | names, info); | |
1074 | /* | |
1075 | * Everything under the name matches; skip the | |
1076 | * entire hierarchy. diff_index_cached codepath | |
1077 | * special cases D/F conflicts in such a way that | |
1078 | * it does not do any look-ahead, so this is safe. | |
1079 | */ | |
1080 | if (matches) { | |
1081 | o->cache_bottom += matches; | |
1082 | return mask; | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | if (traverse_trees_recursive(n, dirmask, mask & ~dirmask, | |
1087 | names, info) < 0) | |
1088 | return -1; | |
1089 | return mask; | |
1090 | } | |
1091 | ||
1092 | return mask; | |
1093 | } | |
1094 | ||
1095 | static int clear_ce_flags_1(struct cache_entry **cache, int nr, | |
1096 | struct strbuf *prefix, | |
1097 | int select_mask, int clear_mask, | |
1098 | struct exclude_list *el, int defval); | |
1099 | ||
1100 | /* Whole directory matching */ | |
1101 | static int clear_ce_flags_dir(struct cache_entry **cache, int nr, | |
1102 | struct strbuf *prefix, | |
1103 | char *basename, | |
1104 | int select_mask, int clear_mask, | |
1105 | struct exclude_list *el, int defval) | |
1106 | { | |
1107 | struct cache_entry **cache_end; | |
1108 | int dtype = DT_DIR; | |
1109 | int ret = is_excluded_from_list(prefix->buf, prefix->len, | |
1110 | basename, &dtype, el, &the_index); | |
1111 | int rc; | |
1112 | ||
1113 | strbuf_addch(prefix, '/'); | |
1114 | ||
1115 | /* If undecided, use matching result of parent dir in defval */ | |
1116 | if (ret < 0) | |
1117 | ret = defval; | |
1118 | ||
1119 | for (cache_end = cache; cache_end != cache + nr; cache_end++) { | |
1120 | struct cache_entry *ce = *cache_end; | |
1121 | if (strncmp(ce->name, prefix->buf, prefix->len)) | |
1122 | break; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * TODO: check el, if there are no patterns that may conflict | |
1127 | * with ret (iow, we know in advance the incl/excl | |
1128 | * decision for the entire directory), clear flag here without | |
1129 | * calling clear_ce_flags_1(). That function will call | |
1130 | * the expensive is_excluded_from_list() on every entry. | |
1131 | */ | |
1132 | rc = clear_ce_flags_1(cache, cache_end - cache, | |
1133 | prefix, | |
1134 | select_mask, clear_mask, | |
1135 | el, ret); | |
1136 | strbuf_setlen(prefix, prefix->len - 1); | |
1137 | return rc; | |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * Traverse the index, find every entry that matches according to | |
1142 | * o->el. Do "ce_flags &= ~clear_mask" on those entries. Return the | |
1143 | * number of traversed entries. | |
1144 | * | |
1145 | * If select_mask is non-zero, only entries whose ce_flags has on of | |
1146 | * those bits enabled are traversed. | |
1147 | * | |
1148 | * cache : pointer to an index entry | |
1149 | * prefix_len : an offset to its path | |
1150 | * | |
1151 | * The current path ("prefix") including the trailing '/' is | |
1152 | * cache[0]->name[0..(prefix_len-1)] | |
1153 | * Top level path has prefix_len zero. | |
1154 | */ | |
1155 | static int clear_ce_flags_1(struct cache_entry **cache, int nr, | |
1156 | struct strbuf *prefix, | |
1157 | int select_mask, int clear_mask, | |
1158 | struct exclude_list *el, int defval) | |
1159 | { | |
1160 | struct cache_entry **cache_end = cache + nr; | |
1161 | ||
1162 | /* | |
1163 | * Process all entries that have the given prefix and meet | |
1164 | * select_mask condition | |
1165 | */ | |
1166 | while(cache != cache_end) { | |
1167 | struct cache_entry *ce = *cache; | |
1168 | const char *name, *slash; | |
1169 | int len, dtype, ret; | |
1170 | ||
1171 | if (select_mask && !(ce->ce_flags & select_mask)) { | |
1172 | cache++; | |
1173 | continue; | |
1174 | } | |
1175 | ||
1176 | if (prefix->len && strncmp(ce->name, prefix->buf, prefix->len)) | |
1177 | break; | |
1178 | ||
1179 | name = ce->name + prefix->len; | |
1180 | slash = strchr(name, '/'); | |
1181 | ||
1182 | /* If it's a directory, try whole directory match first */ | |
1183 | if (slash) { | |
1184 | int processed; | |
1185 | ||
1186 | len = slash - name; | |
1187 | strbuf_add(prefix, name, len); | |
1188 | ||
1189 | processed = clear_ce_flags_dir(cache, cache_end - cache, | |
1190 | prefix, | |
1191 | prefix->buf + prefix->len - len, | |
1192 | select_mask, clear_mask, | |
1193 | el, defval); | |
1194 | ||
1195 | /* clear_c_f_dir eats a whole dir already? */ | |
1196 | if (processed) { | |
1197 | cache += processed; | |
1198 | strbuf_setlen(prefix, prefix->len - len); | |
1199 | continue; | |
1200 | } | |
1201 | ||
1202 | strbuf_addch(prefix, '/'); | |
1203 | cache += clear_ce_flags_1(cache, cache_end - cache, | |
1204 | prefix, | |
1205 | select_mask, clear_mask, el, defval); | |
1206 | strbuf_setlen(prefix, prefix->len - len - 1); | |
1207 | continue; | |
1208 | } | |
1209 | ||
1210 | /* Non-directory */ | |
1211 | dtype = ce_to_dtype(ce); | |
1212 | ret = is_excluded_from_list(ce->name, ce_namelen(ce), | |
1213 | name, &dtype, el, &the_index); | |
1214 | if (ret < 0) | |
1215 | ret = defval; | |
1216 | if (ret > 0) | |
1217 | ce->ce_flags &= ~clear_mask; | |
1218 | cache++; | |
1219 | } | |
1220 | return nr - (cache_end - cache); | |
1221 | } | |
1222 | ||
1223 | static int clear_ce_flags(struct cache_entry **cache, int nr, | |
1224 | int select_mask, int clear_mask, | |
1225 | struct exclude_list *el) | |
1226 | { | |
1227 | static struct strbuf prefix = STRBUF_INIT; | |
1228 | ||
1229 | strbuf_reset(&prefix); | |
1230 | ||
1231 | return clear_ce_flags_1(cache, nr, | |
1232 | &prefix, | |
1233 | select_mask, clear_mask, | |
1234 | el, 0); | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * Set/Clear CE_NEW_SKIP_WORKTREE according to $GIT_DIR/info/sparse-checkout | |
1239 | */ | |
1240 | static void mark_new_skip_worktree(struct exclude_list *el, | |
1241 | struct index_state *the_index, | |
1242 | int select_flag, int skip_wt_flag) | |
1243 | { | |
1244 | int i; | |
1245 | ||
1246 | /* | |
1247 | * 1. Pretend the narrowest worktree: only unmerged entries | |
1248 | * are checked out | |
1249 | */ | |
1250 | for (i = 0; i < the_index->cache_nr; i++) { | |
1251 | struct cache_entry *ce = the_index->cache[i]; | |
1252 | ||
1253 | if (select_flag && !(ce->ce_flags & select_flag)) | |
1254 | continue; | |
1255 | ||
1256 | if (!ce_stage(ce) && !(ce->ce_flags & CE_CONFLICTED)) | |
1257 | ce->ce_flags |= skip_wt_flag; | |
1258 | else | |
1259 | ce->ce_flags &= ~skip_wt_flag; | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * 2. Widen worktree according to sparse-checkout file. | |
1264 | * Matched entries will have skip_wt_flag cleared (i.e. "in") | |
1265 | */ | |
1266 | clear_ce_flags(the_index->cache, the_index->cache_nr, | |
1267 | select_flag, skip_wt_flag, el); | |
1268 | } | |
1269 | ||
1270 | static int verify_absent(const struct cache_entry *, | |
1271 | enum unpack_trees_error_types, | |
1272 | struct unpack_trees_options *); | |
1273 | /* | |
1274 | * N-way merge "len" trees. Returns 0 on success, -1 on failure to manipulate the | |
1275 | * resulting index, -2 on failure to reflect the changes to the work tree. | |
1276 | * | |
1277 | * CE_ADDED, CE_UNPACKED and CE_NEW_SKIP_WORKTREE are used internally | |
1278 | */ | |
1279 | int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options *o) | |
1280 | { | |
1281 | int i, ret; | |
1282 | static struct cache_entry *dfc; | |
1283 | struct exclude_list el; | |
1284 | ||
1285 | if (len > MAX_UNPACK_TREES) | |
1286 | die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES); | |
1287 | ||
1288 | memset(&el, 0, sizeof(el)); | |
1289 | if (!core_apply_sparse_checkout || !o->update) | |
1290 | o->skip_sparse_checkout = 1; | |
1291 | if (!o->skip_sparse_checkout) { | |
1292 | char *sparse = git_pathdup("info/sparse-checkout"); | |
1293 | if (add_excludes_from_file_to_list(sparse, "", 0, &el, NULL) < 0) | |
1294 | o->skip_sparse_checkout = 1; | |
1295 | else | |
1296 | o->el = ⪙ | |
1297 | free(sparse); | |
1298 | } | |
1299 | ||
1300 | memset(&o->result, 0, sizeof(o->result)); | |
1301 | o->result.initialized = 1; | |
1302 | o->result.timestamp.sec = o->src_index->timestamp.sec; | |
1303 | o->result.timestamp.nsec = o->src_index->timestamp.nsec; | |
1304 | o->result.version = o->src_index->version; | |
1305 | if (!o->src_index->split_index) { | |
1306 | o->result.split_index = NULL; | |
1307 | } else if (o->src_index == o->dst_index) { | |
1308 | /* | |
1309 | * o->dst_index (and thus o->src_index) will be discarded | |
1310 | * and overwritten with o->result at the end of this function, | |
1311 | * so just use src_index's split_index to avoid having to | |
1312 | * create a new one. | |
1313 | */ | |
1314 | o->result.split_index = o->src_index->split_index; | |
1315 | o->result.split_index->refcount++; | |
1316 | } else { | |
1317 | o->result.split_index = init_split_index(&o->result); | |
1318 | } | |
1319 | oidcpy(&o->result.oid, &o->src_index->oid); | |
1320 | o->merge_size = len; | |
1321 | mark_all_ce_unused(o->src_index); | |
1322 | ||
1323 | /* | |
1324 | * Sparse checkout loop #1: set NEW_SKIP_WORKTREE on existing entries | |
1325 | */ | |
1326 | if (!o->skip_sparse_checkout) | |
1327 | mark_new_skip_worktree(o->el, o->src_index, 0, CE_NEW_SKIP_WORKTREE); | |
1328 | ||
1329 | if (!dfc) | |
1330 | dfc = xcalloc(1, cache_entry_size(0)); | |
1331 | o->df_conflict_entry = dfc; | |
1332 | ||
1333 | if (len) { | |
1334 | const char *prefix = o->prefix ? o->prefix : ""; | |
1335 | struct traverse_info info; | |
1336 | ||
1337 | setup_traverse_info(&info, prefix); | |
1338 | info.fn = unpack_callback; | |
1339 | info.data = o; | |
1340 | info.show_all_errors = o->show_all_errors; | |
1341 | info.pathspec = o->pathspec; | |
1342 | ||
1343 | if (o->prefix) { | |
1344 | /* | |
1345 | * Unpack existing index entries that sort before the | |
1346 | * prefix the tree is spliced into. Note that o->merge | |
1347 | * is always true in this case. | |
1348 | */ | |
1349 | while (1) { | |
1350 | struct cache_entry *ce = next_cache_entry(o); | |
1351 | if (!ce) | |
1352 | break; | |
1353 | if (ce_in_traverse_path(ce, &info)) | |
1354 | break; | |
1355 | if (unpack_index_entry(ce, o) < 0) | |
1356 | goto return_failed; | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | if (traverse_trees(len, t, &info) < 0) | |
1361 | goto return_failed; | |
1362 | } | |
1363 | ||
1364 | /* Any left-over entries in the index? */ | |
1365 | if (o->merge) { | |
1366 | while (1) { | |
1367 | struct cache_entry *ce = next_cache_entry(o); | |
1368 | if (!ce) | |
1369 | break; | |
1370 | if (unpack_index_entry(ce, o) < 0) | |
1371 | goto return_failed; | |
1372 | } | |
1373 | } | |
1374 | mark_all_ce_unused(o->src_index); | |
1375 | ||
1376 | if (o->trivial_merges_only && o->nontrivial_merge) { | |
1377 | ret = unpack_failed(o, "Merge requires file-level merging"); | |
1378 | goto done; | |
1379 | } | |
1380 | ||
1381 | if (!o->skip_sparse_checkout) { | |
1382 | int empty_worktree = 1; | |
1383 | ||
1384 | /* | |
1385 | * Sparse checkout loop #2: set NEW_SKIP_WORKTREE on entries not in loop #1 | |
1386 | * If the will have NEW_SKIP_WORKTREE, also set CE_SKIP_WORKTREE | |
1387 | * so apply_sparse_checkout() won't attempt to remove it from worktree | |
1388 | */ | |
1389 | mark_new_skip_worktree(o->el, &o->result, CE_ADDED, CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE); | |
1390 | ||
1391 | ret = 0; | |
1392 | for (i = 0; i < o->result.cache_nr; i++) { | |
1393 | struct cache_entry *ce = o->result.cache[i]; | |
1394 | ||
1395 | /* | |
1396 | * Entries marked with CE_ADDED in merged_entry() do not have | |
1397 | * verify_absent() check (the check is effectively disabled | |
1398 | * because CE_NEW_SKIP_WORKTREE is set unconditionally). | |
1399 | * | |
1400 | * Do the real check now because we have had | |
1401 | * correct CE_NEW_SKIP_WORKTREE | |
1402 | */ | |
1403 | if (ce->ce_flags & CE_ADDED && | |
1404 | verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) { | |
1405 | if (!o->show_all_errors) | |
1406 | goto return_failed; | |
1407 | ret = -1; | |
1408 | } | |
1409 | ||
1410 | if (apply_sparse_checkout(&o->result, ce, o)) { | |
1411 | if (!o->show_all_errors) | |
1412 | goto return_failed; | |
1413 | ret = -1; | |
1414 | } | |
1415 | if (!ce_skip_worktree(ce)) | |
1416 | empty_worktree = 0; | |
1417 | ||
1418 | } | |
1419 | if (ret < 0) | |
1420 | goto return_failed; | |
1421 | /* | |
1422 | * Sparse checkout is meant to narrow down checkout area | |
1423 | * but it does not make sense to narrow down to empty working | |
1424 | * tree. This is usually a mistake in sparse checkout rules. | |
1425 | * Do not allow users to do that. | |
1426 | */ | |
1427 | if (o->result.cache_nr && empty_worktree) { | |
1428 | ret = unpack_failed(o, "Sparse checkout leaves no entry on working directory"); | |
1429 | goto done; | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | ret = check_updates(o) ? (-2) : 0; | |
1434 | if (o->dst_index) { | |
1435 | if (!ret) { | |
1436 | if (!o->result.cache_tree) | |
1437 | o->result.cache_tree = cache_tree(); | |
1438 | if (!cache_tree_fully_valid(o->result.cache_tree)) | |
1439 | cache_tree_update(&o->result, | |
1440 | WRITE_TREE_SILENT | | |
1441 | WRITE_TREE_REPAIR); | |
1442 | } | |
1443 | move_index_extensions(&o->result, o->src_index); | |
1444 | discard_index(o->dst_index); | |
1445 | *o->dst_index = o->result; | |
1446 | } else { | |
1447 | discard_index(&o->result); | |
1448 | } | |
1449 | o->src_index = NULL; | |
1450 | ||
1451 | done: | |
1452 | clear_exclude_list(&el); | |
1453 | return ret; | |
1454 | ||
1455 | return_failed: | |
1456 | if (o->show_all_errors) | |
1457 | display_error_msgs(o); | |
1458 | mark_all_ce_unused(o->src_index); | |
1459 | ret = unpack_failed(o, NULL); | |
1460 | if (o->exiting_early) | |
1461 | ret = 0; | |
1462 | goto done; | |
1463 | } | |
1464 | ||
1465 | /* Here come the merge functions */ | |
1466 | ||
1467 | static int reject_merge(const struct cache_entry *ce, | |
1468 | struct unpack_trees_options *o) | |
1469 | { | |
1470 | return o->gently ? -1 : | |
1471 | add_rejected_path(o, ERROR_WOULD_OVERWRITE, ce->name); | |
1472 | } | |
1473 | ||
1474 | static int same(const struct cache_entry *a, const struct cache_entry *b) | |
1475 | { | |
1476 | if (!!a != !!b) | |
1477 | return 0; | |
1478 | if (!a && !b) | |
1479 | return 1; | |
1480 | if ((a->ce_flags | b->ce_flags) & CE_CONFLICTED) | |
1481 | return 0; | |
1482 | return a->ce_mode == b->ce_mode && | |
1483 | !oidcmp(&a->oid, &b->oid); | |
1484 | } | |
1485 | ||
1486 | ||
1487 | /* | |
1488 | * When a CE gets turned into an unmerged entry, we | |
1489 | * want it to be up-to-date | |
1490 | */ | |
1491 | static int verify_uptodate_1(const struct cache_entry *ce, | |
1492 | struct unpack_trees_options *o, | |
1493 | enum unpack_trees_error_types error_type) | |
1494 | { | |
1495 | struct stat st; | |
1496 | ||
1497 | if (o->index_only) | |
1498 | return 0; | |
1499 | ||
1500 | /* | |
1501 | * CE_VALID and CE_SKIP_WORKTREE cheat, we better check again | |
1502 | * if this entry is truly up-to-date because this file may be | |
1503 | * overwritten. | |
1504 | */ | |
1505 | if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) | |
1506 | ; /* keep checking */ | |
1507 | else if (o->reset || ce_uptodate(ce)) | |
1508 | return 0; | |
1509 | ||
1510 | if (!lstat(ce->name, &st)) { | |
1511 | int flags = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE; | |
1512 | unsigned changed = ie_match_stat(o->src_index, ce, &st, flags); | |
1513 | ||
1514 | if (submodule_from_ce(ce)) { | |
1515 | int r = check_submodule_move_head(ce, | |
1516 | "HEAD", oid_to_hex(&ce->oid), o); | |
1517 | if (r) | |
1518 | return o->gently ? -1 : | |
1519 | add_rejected_path(o, error_type, ce->name); | |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | if (!changed) | |
1524 | return 0; | |
1525 | /* | |
1526 | * Historic default policy was to allow submodule to be out | |
1527 | * of sync wrt the superproject index. If the submodule was | |
1528 | * not considered interesting above, we don't care here. | |
1529 | */ | |
1530 | if (S_ISGITLINK(ce->ce_mode)) | |
1531 | return 0; | |
1532 | ||
1533 | errno = 0; | |
1534 | } | |
1535 | if (errno == ENOENT) | |
1536 | return 0; | |
1537 | return o->gently ? -1 : | |
1538 | add_rejected_path(o, error_type, ce->name); | |
1539 | } | |
1540 | ||
1541 | int verify_uptodate(const struct cache_entry *ce, | |
1542 | struct unpack_trees_options *o) | |
1543 | { | |
1544 | if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE)) | |
1545 | return 0; | |
1546 | return verify_uptodate_1(ce, o, ERROR_NOT_UPTODATE_FILE); | |
1547 | } | |
1548 | ||
1549 | static int verify_uptodate_sparse(const struct cache_entry *ce, | |
1550 | struct unpack_trees_options *o) | |
1551 | { | |
1552 | return verify_uptodate_1(ce, o, ERROR_SPARSE_NOT_UPTODATE_FILE); | |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * TODO: We should actually invalidate o->result, not src_index [1]. | |
1557 | * But since cache tree and untracked cache both are not copied to | |
1558 | * o->result until unpacking is complete, we invalidate them on | |
1559 | * src_index instead with the assumption that they will be copied to | |
1560 | * dst_index at the end. | |
1561 | * | |
1562 | * [1] src_index->cache_tree is also used in unpack_callback() so if | |
1563 | * we invalidate o->result, we need to update it to use | |
1564 | * o->result.cache_tree as well. | |
1565 | */ | |
1566 | static void invalidate_ce_path(const struct cache_entry *ce, | |
1567 | struct unpack_trees_options *o) | |
1568 | { | |
1569 | if (!ce) | |
1570 | return; | |
1571 | cache_tree_invalidate_path(o->src_index, ce->name); | |
1572 | untracked_cache_invalidate_path(o->src_index, ce->name, 1); | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Check that checking out ce->sha1 in subdir ce->name is not | |
1577 | * going to overwrite any working files. | |
1578 | * | |
1579 | * Currently, git does not checkout subprojects during a superproject | |
1580 | * checkout, so it is not going to overwrite anything. | |
1581 | */ | |
1582 | static int verify_clean_submodule(const char *old_sha1, | |
1583 | const struct cache_entry *ce, | |
1584 | enum unpack_trees_error_types error_type, | |
1585 | struct unpack_trees_options *o) | |
1586 | { | |
1587 | if (!submodule_from_ce(ce)) | |
1588 | return 0; | |
1589 | ||
1590 | return check_submodule_move_head(ce, old_sha1, | |
1591 | oid_to_hex(&ce->oid), o); | |
1592 | } | |
1593 | ||
1594 | static int verify_clean_subdirectory(const struct cache_entry *ce, | |
1595 | enum unpack_trees_error_types error_type, | |
1596 | struct unpack_trees_options *o) | |
1597 | { | |
1598 | /* | |
1599 | * we are about to extract "ce->name"; we would not want to lose | |
1600 | * anything in the existing directory there. | |
1601 | */ | |
1602 | int namelen; | |
1603 | int i; | |
1604 | struct dir_struct d; | |
1605 | char *pathbuf; | |
1606 | int cnt = 0; | |
1607 | ||
1608 | if (S_ISGITLINK(ce->ce_mode)) { | |
1609 | struct object_id oid; | |
1610 | int sub_head = resolve_gitlink_ref(ce->name, "HEAD", &oid); | |
1611 | /* | |
1612 | * If we are not going to update the submodule, then | |
1613 | * we don't care. | |
1614 | */ | |
1615 | if (!sub_head && !oidcmp(&oid, &ce->oid)) | |
1616 | return 0; | |
1617 | return verify_clean_submodule(sub_head ? NULL : oid_to_hex(&oid), | |
1618 | ce, error_type, o); | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * First let's make sure we do not have a local modification | |
1623 | * in that directory. | |
1624 | */ | |
1625 | namelen = ce_namelen(ce); | |
1626 | for (i = locate_in_src_index(ce, o); | |
1627 | i < o->src_index->cache_nr; | |
1628 | i++) { | |
1629 | struct cache_entry *ce2 = o->src_index->cache[i]; | |
1630 | int len = ce_namelen(ce2); | |
1631 | if (len < namelen || | |
1632 | strncmp(ce->name, ce2->name, namelen) || | |
1633 | ce2->name[namelen] != '/') | |
1634 | break; | |
1635 | /* | |
1636 | * ce2->name is an entry in the subdirectory to be | |
1637 | * removed. | |
1638 | */ | |
1639 | if (!ce_stage(ce2)) { | |
1640 | if (verify_uptodate(ce2, o)) | |
1641 | return -1; | |
1642 | add_entry(o, ce2, CE_REMOVE, 0); | |
1643 | mark_ce_used(ce2, o); | |
1644 | } | |
1645 | cnt++; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Then we need to make sure that we do not lose a locally | |
1650 | * present file that is not ignored. | |
1651 | */ | |
1652 | pathbuf = xstrfmt("%.*s/", namelen, ce->name); | |
1653 | ||
1654 | memset(&d, 0, sizeof(d)); | |
1655 | if (o->dir) | |
1656 | d.exclude_per_dir = o->dir->exclude_per_dir; | |
1657 | i = read_directory(&d, &the_index, pathbuf, namelen+1, NULL); | |
1658 | if (i) | |
1659 | return o->gently ? -1 : | |
1660 | add_rejected_path(o, ERROR_NOT_UPTODATE_DIR, ce->name); | |
1661 | free(pathbuf); | |
1662 | return cnt; | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * This gets called when there was no index entry for the tree entry 'dst', | |
1667 | * but we found a file in the working tree that 'lstat()' said was fine, | |
1668 | * and we're on a case-insensitive filesystem. | |
1669 | * | |
1670 | * See if we can find a case-insensitive match in the index that also | |
1671 | * matches the stat information, and assume it's that other file! | |
1672 | */ | |
1673 | static int icase_exists(struct unpack_trees_options *o, const char *name, int len, struct stat *st) | |
1674 | { | |
1675 | const struct cache_entry *src; | |
1676 | ||
1677 | src = index_file_exists(o->src_index, name, len, 1); | |
1678 | return src && !ie_match_stat(o->src_index, src, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); | |
1679 | } | |
1680 | ||
1681 | static int check_ok_to_remove(const char *name, int len, int dtype, | |
1682 | const struct cache_entry *ce, struct stat *st, | |
1683 | enum unpack_trees_error_types error_type, | |
1684 | struct unpack_trees_options *o) | |
1685 | { | |
1686 | const struct cache_entry *result; | |
1687 | ||
1688 | /* | |
1689 | * It may be that the 'lstat()' succeeded even though | |
1690 | * target 'ce' was absent, because there is an old | |
1691 | * entry that is different only in case.. | |
1692 | * | |
1693 | * Ignore that lstat() if it matches. | |
1694 | */ | |
1695 | if (ignore_case && icase_exists(o, name, len, st)) | |
1696 | return 0; | |
1697 | ||
1698 | if (o->dir && | |
1699 | is_excluded(o->dir, &the_index, name, &dtype)) | |
1700 | /* | |
1701 | * ce->name is explicitly excluded, so it is Ok to | |
1702 | * overwrite it. | |
1703 | */ | |
1704 | return 0; | |
1705 | if (S_ISDIR(st->st_mode)) { | |
1706 | /* | |
1707 | * We are checking out path "foo" and | |
1708 | * found "foo/." in the working tree. | |
1709 | * This is tricky -- if we have modified | |
1710 | * files that are in "foo/" we would lose | |
1711 | * them. | |
1712 | */ | |
1713 | if (verify_clean_subdirectory(ce, error_type, o) < 0) | |
1714 | return -1; | |
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * The previous round may already have decided to | |
1720 | * delete this path, which is in a subdirectory that | |
1721 | * is being replaced with a blob. | |
1722 | */ | |
1723 | result = index_file_exists(&o->result, name, len, 0); | |
1724 | if (result) { | |
1725 | if (result->ce_flags & CE_REMOVE) | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | return o->gently ? -1 : | |
1730 | add_rejected_path(o, error_type, name); | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * We do not want to remove or overwrite a working tree file that | |
1735 | * is not tracked, unless it is ignored. | |
1736 | */ | |
1737 | static int verify_absent_1(const struct cache_entry *ce, | |
1738 | enum unpack_trees_error_types error_type, | |
1739 | struct unpack_trees_options *o) | |
1740 | { | |
1741 | int len; | |
1742 | struct stat st; | |
1743 | ||
1744 | if (o->index_only || o->reset || !o->update) | |
1745 | return 0; | |
1746 | ||
1747 | len = check_leading_path(ce->name, ce_namelen(ce)); | |
1748 | if (!len) | |
1749 | return 0; | |
1750 | else if (len > 0) { | |
1751 | char *path; | |
1752 | int ret; | |
1753 | ||
1754 | path = xmemdupz(ce->name, len); | |
1755 | if (lstat(path, &st)) | |
1756 | ret = error_errno("cannot stat '%s'", path); | |
1757 | else { | |
1758 | if (submodule_from_ce(ce)) | |
1759 | ret = check_submodule_move_head(ce, | |
1760 | oid_to_hex(&ce->oid), | |
1761 | NULL, o); | |
1762 | else | |
1763 | ret = check_ok_to_remove(path, len, DT_UNKNOWN, NULL, | |
1764 | &st, error_type, o); | |
1765 | } | |
1766 | free(path); | |
1767 | return ret; | |
1768 | } else if (lstat(ce->name, &st)) { | |
1769 | if (errno != ENOENT) | |
1770 | return error_errno("cannot stat '%s'", ce->name); | |
1771 | return 0; | |
1772 | } else { | |
1773 | if (submodule_from_ce(ce)) | |
1774 | return check_submodule_move_head(ce, oid_to_hex(&ce->oid), | |
1775 | NULL, o); | |
1776 | ||
1777 | return check_ok_to_remove(ce->name, ce_namelen(ce), | |
1778 | ce_to_dtype(ce), ce, &st, | |
1779 | error_type, o); | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | static int verify_absent(const struct cache_entry *ce, | |
1784 | enum unpack_trees_error_types error_type, | |
1785 | struct unpack_trees_options *o) | |
1786 | { | |
1787 | if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE)) | |
1788 | return 0; | |
1789 | return verify_absent_1(ce, error_type, o); | |
1790 | } | |
1791 | ||
1792 | static int verify_absent_sparse(const struct cache_entry *ce, | |
1793 | enum unpack_trees_error_types error_type, | |
1794 | struct unpack_trees_options *o) | |
1795 | { | |
1796 | enum unpack_trees_error_types orphaned_error = error_type; | |
1797 | if (orphaned_error == ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN) | |
1798 | orphaned_error = ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN; | |
1799 | ||
1800 | return verify_absent_1(ce, orphaned_error, o); | |
1801 | } | |
1802 | ||
1803 | static int merged_entry(const struct cache_entry *ce, | |
1804 | const struct cache_entry *old, | |
1805 | struct unpack_trees_options *o) | |
1806 | { | |
1807 | int update = CE_UPDATE; | |
1808 | struct cache_entry *merge = dup_cache_entry(ce, &o->result); | |
1809 | ||
1810 | if (!old) { | |
1811 | /* | |
1812 | * New index entries. In sparse checkout, the following | |
1813 | * verify_absent() will be delayed until after | |
1814 | * traverse_trees() finishes in unpack_trees(), then: | |
1815 | * | |
1816 | * - CE_NEW_SKIP_WORKTREE will be computed correctly | |
1817 | * - verify_absent() be called again, this time with | |
1818 | * correct CE_NEW_SKIP_WORKTREE | |
1819 | * | |
1820 | * verify_absent() call here does nothing in sparse | |
1821 | * checkout (i.e. o->skip_sparse_checkout == 0) | |
1822 | */ | |
1823 | update |= CE_ADDED; | |
1824 | merge->ce_flags |= CE_NEW_SKIP_WORKTREE; | |
1825 | ||
1826 | if (verify_absent(merge, | |
1827 | ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) { | |
1828 | discard_cache_entry(merge); | |
1829 | return -1; | |
1830 | } | |
1831 | invalidate_ce_path(merge, o); | |
1832 | ||
1833 | if (submodule_from_ce(ce)) { | |
1834 | int ret = check_submodule_move_head(ce, NULL, | |
1835 | oid_to_hex(&ce->oid), | |
1836 | o); | |
1837 | if (ret) | |
1838 | return ret; | |
1839 | } | |
1840 | ||
1841 | } else if (!(old->ce_flags & CE_CONFLICTED)) { | |
1842 | /* | |
1843 | * See if we can re-use the old CE directly? | |
1844 | * That way we get the uptodate stat info. | |
1845 | * | |
1846 | * This also removes the UPDATE flag on a match; otherwise | |
1847 | * we will end up overwriting local changes in the work tree. | |
1848 | */ | |
1849 | if (same(old, merge)) { | |
1850 | copy_cache_entry(merge, old); | |
1851 | update = 0; | |
1852 | } else { | |
1853 | if (verify_uptodate(old, o)) { | |
1854 | discard_cache_entry(merge); | |
1855 | return -1; | |
1856 | } | |
1857 | /* Migrate old flags over */ | |
1858 | update |= old->ce_flags & (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE); | |
1859 | invalidate_ce_path(old, o); | |
1860 | } | |
1861 | ||
1862 | if (submodule_from_ce(ce)) { | |
1863 | int ret = check_submodule_move_head(ce, oid_to_hex(&old->oid), | |
1864 | oid_to_hex(&ce->oid), | |
1865 | o); | |
1866 | if (ret) | |
1867 | return ret; | |
1868 | } | |
1869 | } else { | |
1870 | /* | |
1871 | * Previously unmerged entry left as an existence | |
1872 | * marker by read_index_unmerged(); | |
1873 | */ | |
1874 | invalidate_ce_path(old, o); | |
1875 | } | |
1876 | ||
1877 | do_add_entry(o, merge, update, CE_STAGEMASK); | |
1878 | return 1; | |
1879 | } | |
1880 | ||
1881 | static int deleted_entry(const struct cache_entry *ce, | |
1882 | const struct cache_entry *old, | |
1883 | struct unpack_trees_options *o) | |
1884 | { | |
1885 | /* Did it exist in the index? */ | |
1886 | if (!old) { | |
1887 | if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) | |
1888 | return -1; | |
1889 | return 0; | |
1890 | } | |
1891 | if (!(old->ce_flags & CE_CONFLICTED) && verify_uptodate(old, o)) | |
1892 | return -1; | |
1893 | add_entry(o, ce, CE_REMOVE, 0); | |
1894 | invalidate_ce_path(ce, o); | |
1895 | return 1; | |
1896 | } | |
1897 | ||
1898 | static int keep_entry(const struct cache_entry *ce, | |
1899 | struct unpack_trees_options *o) | |
1900 | { | |
1901 | add_entry(o, ce, 0, 0); | |
1902 | return 1; | |
1903 | } | |
1904 | ||
1905 | #if DBRT_DEBUG | |
1906 | static void show_stage_entry(FILE *o, | |
1907 | const char *label, const struct cache_entry *ce) | |
1908 | { | |
1909 | if (!ce) | |
1910 | fprintf(o, "%s (missing)\n", label); | |
1911 | else | |
1912 | fprintf(o, "%s%06o %s %d\t%s\n", | |
1913 | label, | |
1914 | ce->ce_mode, | |
1915 | oid_to_hex(&ce->oid), | |
1916 | ce_stage(ce), | |
1917 | ce->name); | |
1918 | } | |
1919 | #endif | |
1920 | ||
1921 | int threeway_merge(const struct cache_entry * const *stages, | |
1922 | struct unpack_trees_options *o) | |
1923 | { | |
1924 | const struct cache_entry *index; | |
1925 | const struct cache_entry *head; | |
1926 | const struct cache_entry *remote = stages[o->head_idx + 1]; | |
1927 | int count; | |
1928 | int head_match = 0; | |
1929 | int remote_match = 0; | |
1930 | ||
1931 | int df_conflict_head = 0; | |
1932 | int df_conflict_remote = 0; | |
1933 | ||
1934 | int any_anc_missing = 0; | |
1935 | int no_anc_exists = 1; | |
1936 | int i; | |
1937 | ||
1938 | for (i = 1; i < o->head_idx; i++) { | |
1939 | if (!stages[i] || stages[i] == o->df_conflict_entry) | |
1940 | any_anc_missing = 1; | |
1941 | else | |
1942 | no_anc_exists = 0; | |
1943 | } | |
1944 | ||
1945 | index = stages[0]; | |
1946 | head = stages[o->head_idx]; | |
1947 | ||
1948 | if (head == o->df_conflict_entry) { | |
1949 | df_conflict_head = 1; | |
1950 | head = NULL; | |
1951 | } | |
1952 | ||
1953 | if (remote == o->df_conflict_entry) { | |
1954 | df_conflict_remote = 1; | |
1955 | remote = NULL; | |
1956 | } | |
1957 | ||
1958 | /* | |
1959 | * First, if there's a #16 situation, note that to prevent #13 | |
1960 | * and #14. | |
1961 | */ | |
1962 | if (!same(remote, head)) { | |
1963 | for (i = 1; i < o->head_idx; i++) { | |
1964 | if (same(stages[i], head)) { | |
1965 | head_match = i; | |
1966 | } | |
1967 | if (same(stages[i], remote)) { | |
1968 | remote_match = i; | |
1969 | } | |
1970 | } | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * We start with cases where the index is allowed to match | |
1975 | * something other than the head: #14(ALT) and #2ALT, where it | |
1976 | * is permitted to match the result instead. | |
1977 | */ | |
1978 | /* #14, #14ALT, #2ALT */ | |
1979 | if (remote && !df_conflict_head && head_match && !remote_match) { | |
1980 | if (index && !same(index, remote) && !same(index, head)) | |
1981 | return reject_merge(index, o); | |
1982 | return merged_entry(remote, index, o); | |
1983 | } | |
1984 | /* | |
1985 | * If we have an entry in the index cache, then we want to | |
1986 | * make sure that it matches head. | |
1987 | */ | |
1988 | if (index && !same(index, head)) | |
1989 | return reject_merge(index, o); | |
1990 | ||
1991 | if (head) { | |
1992 | /* #5ALT, #15 */ | |
1993 | if (same(head, remote)) | |
1994 | return merged_entry(head, index, o); | |
1995 | /* #13, #3ALT */ | |
1996 | if (!df_conflict_remote && remote_match && !head_match) | |
1997 | return merged_entry(head, index, o); | |
1998 | } | |
1999 | ||
2000 | /* #1 */ | |
2001 | if (!head && !remote && any_anc_missing) | |
2002 | return 0; | |
2003 | ||
2004 | /* | |
2005 | * Under the "aggressive" rule, we resolve mostly trivial | |
2006 | * cases that we historically had git-merge-one-file resolve. | |
2007 | */ | |
2008 | if (o->aggressive) { | |
2009 | int head_deleted = !head; | |
2010 | int remote_deleted = !remote; | |
2011 | const struct cache_entry *ce = NULL; | |
2012 | ||
2013 | if (index) | |
2014 | ce = index; | |
2015 | else if (head) | |
2016 | ce = head; | |
2017 | else if (remote) | |
2018 | ce = remote; | |
2019 | else { | |
2020 | for (i = 1; i < o->head_idx; i++) { | |
2021 | if (stages[i] && stages[i] != o->df_conflict_entry) { | |
2022 | ce = stages[i]; | |
2023 | break; | |
2024 | } | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * Deleted in both. | |
2030 | * Deleted in one and unchanged in the other. | |
2031 | */ | |
2032 | if ((head_deleted && remote_deleted) || | |
2033 | (head_deleted && remote && remote_match) || | |
2034 | (remote_deleted && head && head_match)) { | |
2035 | if (index) | |
2036 | return deleted_entry(index, index, o); | |
2037 | if (ce && !head_deleted) { | |
2038 | if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) | |
2039 | return -1; | |
2040 | } | |
2041 | return 0; | |
2042 | } | |
2043 | /* | |
2044 | * Added in both, identically. | |
2045 | */ | |
2046 | if (no_anc_exists && head && remote && same(head, remote)) | |
2047 | return merged_entry(head, index, o); | |
2048 | ||
2049 | } | |
2050 | ||
2051 | /* Below are "no merge" cases, which require that the index be | |
2052 | * up-to-date to avoid the files getting overwritten with | |
2053 | * conflict resolution files. | |
2054 | */ | |
2055 | if (index) { | |
2056 | if (verify_uptodate(index, o)) | |
2057 | return -1; | |
2058 | } | |
2059 | ||
2060 | o->nontrivial_merge = 1; | |
2061 | ||
2062 | /* #2, #3, #4, #6, #7, #9, #10, #11. */ | |
2063 | count = 0; | |
2064 | if (!head_match || !remote_match) { | |
2065 | for (i = 1; i < o->head_idx; i++) { | |
2066 | if (stages[i] && stages[i] != o->df_conflict_entry) { | |
2067 | keep_entry(stages[i], o); | |
2068 | count++; | |
2069 | break; | |
2070 | } | |
2071 | } | |
2072 | } | |
2073 | #if DBRT_DEBUG | |
2074 | else { | |
2075 | fprintf(stderr, "read-tree: warning #16 detected\n"); | |
2076 | show_stage_entry(stderr, "head ", stages[head_match]); | |
2077 | show_stage_entry(stderr, "remote ", stages[remote_match]); | |
2078 | } | |
2079 | #endif | |
2080 | if (head) { count += keep_entry(head, o); } | |
2081 | if (remote) { count += keep_entry(remote, o); } | |
2082 | return count; | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * Two-way merge. | |
2087 | * | |
2088 | * The rule is to "carry forward" what is in the index without losing | |
2089 | * information across a "fast-forward", favoring a successful merge | |
2090 | * over a merge failure when it makes sense. For details of the | |
2091 | * "carry forward" rule, please see <Documentation/git-read-tree.txt>. | |
2092 | * | |
2093 | */ | |
2094 | int twoway_merge(const struct cache_entry * const *src, | |
2095 | struct unpack_trees_options *o) | |
2096 | { | |
2097 | const struct cache_entry *current = src[0]; | |
2098 | const struct cache_entry *oldtree = src[1]; | |
2099 | const struct cache_entry *newtree = src[2]; | |
2100 | ||
2101 | if (o->merge_size != 2) | |
2102 | return error("Cannot do a twoway merge of %d trees", | |
2103 | o->merge_size); | |
2104 | ||
2105 | if (oldtree == o->df_conflict_entry) | |
2106 | oldtree = NULL; | |
2107 | if (newtree == o->df_conflict_entry) | |
2108 | newtree = NULL; | |
2109 | ||
2110 | if (current) { | |
2111 | if (current->ce_flags & CE_CONFLICTED) { | |
2112 | if (same(oldtree, newtree) || o->reset) { | |
2113 | if (!newtree) | |
2114 | return deleted_entry(current, current, o); | |
2115 | else | |
2116 | return merged_entry(newtree, current, o); | |
2117 | } | |
2118 | return reject_merge(current, o); | |
2119 | } else if ((!oldtree && !newtree) || /* 4 and 5 */ | |
2120 | (!oldtree && newtree && | |
2121 | same(current, newtree)) || /* 6 and 7 */ | |
2122 | (oldtree && newtree && | |
2123 | same(oldtree, newtree)) || /* 14 and 15 */ | |
2124 | (oldtree && newtree && | |
2125 | !same(oldtree, newtree) && /* 18 and 19 */ | |
2126 | same(current, newtree))) { | |
2127 | return keep_entry(current, o); | |
2128 | } else if (oldtree && !newtree && same(current, oldtree)) { | |
2129 | /* 10 or 11 */ | |
2130 | return deleted_entry(oldtree, current, o); | |
2131 | } else if (oldtree && newtree && | |
2132 | same(current, oldtree) && !same(current, newtree)) { | |
2133 | /* 20 or 21 */ | |
2134 | return merged_entry(newtree, current, o); | |
2135 | } else | |
2136 | return reject_merge(current, o); | |
2137 | } | |
2138 | else if (newtree) { | |
2139 | if (oldtree && !o->initial_checkout) { | |
2140 | /* | |
2141 | * deletion of the path was staged; | |
2142 | */ | |
2143 | if (same(oldtree, newtree)) | |
2144 | return 1; | |
2145 | return reject_merge(oldtree, o); | |
2146 | } | |
2147 | return merged_entry(newtree, current, o); | |
2148 | } | |
2149 | return deleted_entry(oldtree, current, o); | |
2150 | } | |
2151 | ||
2152 | /* | |
2153 | * Bind merge. | |
2154 | * | |
2155 | * Keep the index entries at stage0, collapse stage1 but make sure | |
2156 | * stage0 does not have anything there. | |
2157 | */ | |
2158 | int bind_merge(const struct cache_entry * const *src, | |
2159 | struct unpack_trees_options *o) | |
2160 | { | |
2161 | const struct cache_entry *old = src[0]; | |
2162 | const struct cache_entry *a = src[1]; | |
2163 | ||
2164 | if (o->merge_size != 1) | |
2165 | return error("Cannot do a bind merge of %d trees", | |
2166 | o->merge_size); | |
2167 | if (a && old) | |
2168 | return o->gently ? -1 : | |
2169 | error(ERRORMSG(o, ERROR_BIND_OVERLAP), | |
2170 | super_prefixed(a->name), | |
2171 | super_prefixed(old->name)); | |
2172 | if (!a) | |
2173 | return keep_entry(old, o); | |
2174 | else | |
2175 | return merged_entry(a, NULL, o); | |
2176 | } | |
2177 | ||
2178 | /* | |
2179 | * One-way merge. | |
2180 | * | |
2181 | * The rule is: | |
2182 | * - take the stat information from stage0, take the data from stage1 | |
2183 | */ | |
2184 | int oneway_merge(const struct cache_entry * const *src, | |
2185 | struct unpack_trees_options *o) | |
2186 | { | |
2187 | const struct cache_entry *old = src[0]; | |
2188 | const struct cache_entry *a = src[1]; | |
2189 | ||
2190 | if (o->merge_size != 1) | |
2191 | return error("Cannot do a oneway merge of %d trees", | |
2192 | o->merge_size); | |
2193 | ||
2194 | if (!a || a == o->df_conflict_entry) | |
2195 | return deleted_entry(old, old, o); | |
2196 | ||
2197 | if (old && same(old, a)) { | |
2198 | int update = 0; | |
2199 | if (o->reset && o->update && !ce_uptodate(old) && !ce_skip_worktree(old)) { | |
2200 | struct stat st; | |
2201 | if (lstat(old->name, &st) || | |
2202 | ie_match_stat(o->src_index, old, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE)) | |
2203 | update |= CE_UPDATE; | |
2204 | } | |
2205 | if (o->update && S_ISGITLINK(old->ce_mode) && | |
2206 | should_update_submodules() && !verify_uptodate(old, o)) | |
2207 | update |= CE_UPDATE; | |
2208 | add_entry(o, old, update, 0); | |
2209 | return 0; | |
2210 | } | |
2211 | return merged_entry(a, old, o); | |
2212 | } |