1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "quote.h"
6#include "commit.h"
7#include "diff.h"
8#include "diffcore.h"
9#include "revision.h"
10#include "cache-tree.h"
11#include "unpack-trees.h"
12#include "refs.h"
13#include "submodule.h"
14#include "dir.h"
15#include "fsmonitor.h"
16/*
18 * diff-files
19 */
20/*
22 * Has the work tree entity been removed?
23 *
24 * Return 1 if it was removed from the work tree, 0 if an entity to be
25 * compared with the cache entry ce still exists (the latter includes
26 * the case where a directory that is not a submodule repository
27 * exists for ce that is a submodule -- it is a submodule that is not
28 * checked out). Return negative for an error.
29 */
30static int check_removed(const struct cache_entry *ce, struct stat *st)
31{
32 if (lstat(ce->name, st) < 0) {
33 if (!is_missing_file_error(errno))
34 return -1;
35 return 1;
36 }
37 if (has_symlink_leading_path(ce->name, ce_namelen(ce)))
38 return 1;
39 if (S_ISDIR(st->st_mode)) {
40 struct object_id sub;
41 /*
43 * If ce is already a gitlink, we can have a plain
44 * directory (i.e. the submodule is not checked out),
45 * or a checked out submodule. Either case this is not
46 * a case where something was removed from the work tree,
47 * so we will return 0.
48 *
49 * Otherwise, if the directory is not a submodule
50 * repository, that means ce which was a blob turned into
51 * a directory --- the blob was removed!
52 */
53 if (!S_ISGITLINK(ce->ce_mode) &&
54 resolve_gitlink_ref(ce->name, "HEAD", &sub))
55 return 1;
56 }
57 return 0;
58}
59/*
61 * Has a file changed or has a submodule new commits or a dirty work tree?
62 *
63 * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
64 * option is set, the caller does not only want to know if a submodule is
65 * modified at all but wants to know all the conditions that are met (new
66 * commits, untracked content and/or modified content).
67 */
68static int match_stat_with_submodule(struct diff_options *diffopt,
69 const struct cache_entry *ce,
70 struct stat *st, unsigned ce_option,
71 unsigned *dirty_submodule)
72{
73 int changed = ie_match_stat(diffopt->repo->index, ce, st, ce_option);
74 if (S_ISGITLINK(ce->ce_mode)) {
75 struct diff_flags orig_flags = diffopt->flags;
76 if (!diffopt->flags.override_submodule_config)
77 set_diffopt_flags_from_submodule_config(diffopt, ce->name);
78 if (diffopt->flags.ignore_submodules)
79 changed = 0;
80 else if (!diffopt->flags.ignore_dirty_submodules &&
81 (!changed || diffopt->flags.dirty_submodules))
82 *dirty_submodule = is_submodule_modified(ce->name,
83 diffopt->flags.ignore_untracked_in_submodules);
84 diffopt->flags = orig_flags;
85 }
86 return changed;
87}
88int run_diff_files(struct rev_info *revs, unsigned int option)
90{
91 int entries, i;
92 int diff_unmerged_stage = revs->max_count;
93 unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
94 ? CE_MATCH_RACY_IS_DIRTY : 0);
95 uint64_t start = getnanotime();
96 struct index_state *istate = revs->diffopt.repo->index;
97 diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
99 if (diff_unmerged_stage < 0)
101 diff_unmerged_stage = 2;
102 entries = istate->cache_nr;
103 for (i = 0; i < entries; i++) {
104 unsigned int oldmode, newmode;
105 struct cache_entry *ce = istate->cache[i];
106 int changed;
107 unsigned dirty_submodule = 0;
108 const struct object_id *old_oid, *new_oid;
109 if (diff_can_quit_early(&revs->diffopt))
111 break;
112 if (!ce_path_match(istate, ce, &revs->prune_data, NULL))
114 continue;
115 if (ce_stage(ce)) {
117 struct combine_diff_path *dpath;
118 struct diff_filepair *pair;
119 unsigned int wt_mode = 0;
120 int num_compare_stages = 0;
121 size_t path_len;
122 struct stat st;
123 path_len = ce_namelen(ce);
125 dpath = xmalloc(combine_diff_path_size(5, path_len));
127 dpath->path = (char *) &(dpath->parent[5]);
128 dpath->next = NULL;
130 memcpy(dpath->path, ce->name, path_len);
131 dpath->path[path_len] = '\0';
132 oidclr(&dpath->oid);
133 memset(&(dpath->parent[0]), 0,
134 sizeof(struct combine_diff_parent)*5);
135 changed = check_removed(ce, &st);
137 if (!changed)
138 wt_mode = ce_mode_from_stat(ce, st.st_mode);
139 else {
140 if (changed < 0) {
141 perror(ce->name);
142 continue;
143 }
144 wt_mode = 0;
145 }
146 dpath->mode = wt_mode;
147 while (i < entries) {
149 struct cache_entry *nce = istate->cache[i];
150 int stage;
151 if (strcmp(ce->name, nce->name))
153 break;
154 /* Stage #2 (ours) is the first parent,
156 * stage #3 (theirs) is the second.
157 */
158 stage = ce_stage(nce);
159 if (2 <= stage) {
160 int mode = nce->ce_mode;
161 num_compare_stages++;
162 oidcpy(&dpath->parent[stage - 2].oid,
163 &nce->oid);
164 dpath->parent[stage-2].mode = ce_mode_from_stat(nce, mode);
165 dpath->parent[stage-2].status =
166 DIFF_STATUS_MODIFIED;
167 }
168 /* diff against the proper unmerged stage */
170 if (stage == diff_unmerged_stage)
171 ce = nce;
172 i++;
173 }
174 /*
175 * Compensate for loop update
176 */
177 i--;
178 if (revs->combine_merges && num_compare_stages == 2) {
180 show_combined_diff(dpath, 2,
181 revs->dense_combined_merges,
182 revs);
183 free(dpath);
184 continue;
185 }
186 FREE_AND_NULL(dpath);
187 /*
189 * Show the diff for the 'ce' if we found the one
190 * from the desired stage.
191 */
192 pair = diff_unmerge(&revs->diffopt, ce->name);
193 if (wt_mode)
194 pair->two->mode = wt_mode;
195 if (ce_stage(ce) != diff_unmerged_stage)
196 continue;
197 }
198 if (ce_uptodate(ce) || ce_skip_worktree(ce))
200 continue;
201 /* If CE_VALID is set, don't look at workdir for file removal */
203 if (ce->ce_flags & CE_VALID) {
204 changed = 0;
205 newmode = ce->ce_mode;
206 } else {
207 struct stat st;
208 changed = check_removed(ce, &st);
210 if (changed) {
211 if (changed < 0) {
212 perror(ce->name);
213 continue;
214 }
215 diff_addremove(&revs->diffopt, '-', ce->ce_mode,
216 &ce->oid,
217 !is_null_oid(&ce->oid),
218 ce->name, 0);
219 continue;
220 } else if (revs->diffopt.ita_invisible_in_index &&
221 ce_intent_to_add(ce)) {
222 diff_addremove(&revs->diffopt, '+', ce->ce_mode,
223 the_hash_algo->empty_tree, 0,
224 ce->name, 0);
225 continue;
226 }
227 changed = match_stat_with_submodule(&revs->diffopt, ce, &st,
229 ce_option, &dirty_submodule);
230 newmode = ce_mode_from_stat(ce, st.st_mode);
231 }
232 if (!changed && !dirty_submodule) {
234 ce_mark_uptodate(ce);
235 mark_fsmonitor_valid(ce);
236 if (!revs->diffopt.flags.find_copies_harder)
237 continue;
238 }
239 oldmode = ce->ce_mode;
240 old_oid = &ce->oid;
241 new_oid = changed ? &null_oid : &ce->oid;
242 diff_change(&revs->diffopt, oldmode, newmode,
243 old_oid, new_oid,
244 !is_null_oid(old_oid),
245 !is_null_oid(new_oid),
246 ce->name, 0, dirty_submodule);
247 }
249 diffcore_std(&revs->diffopt);
250 diff_flush(&revs->diffopt);
251 trace_performance_since(start, "diff-files");
252 return 0;
253}
254/*
256 * diff-index
257 */
258/* A file entry went away or appeared */
260static void diff_index_show_file(struct rev_info *revs,
261 const char *prefix,
262 const struct cache_entry *ce,
263 const struct object_id *oid, int oid_valid,
264 unsigned int mode,
265 unsigned dirty_submodule)
266{
267 diff_addremove(&revs->diffopt, prefix[0], mode,
268 oid, oid_valid, ce->name, dirty_submodule);
269}
270static int get_stat_data(const struct cache_entry *ce,
272 const struct object_id **oidp,
273 unsigned int *modep,
274 int cached, int match_missing,
275 unsigned *dirty_submodule, struct diff_options *diffopt)
276{
277 const struct object_id *oid = &ce->oid;
278 unsigned int mode = ce->ce_mode;
279 if (!cached && !ce_uptodate(ce)) {
281 int changed;
282 struct stat st;
283 changed = check_removed(ce, &st);
284 if (changed < 0)
285 return -1;
286 else if (changed) {
287 if (match_missing) {
288 *oidp = oid;
289 *modep = mode;
290 return 0;
291 }
292 return -1;
293 }
294 changed = match_stat_with_submodule(diffopt, ce, &st,
295 0, dirty_submodule);
296 if (changed) {
297 mode = ce_mode_from_stat(ce, st.st_mode);
298 oid = &null_oid;
299 }
300 }
301 *oidp = oid;
303 *modep = mode;
304 return 0;
305}
306static void show_new_file(struct rev_info *revs,
308 const struct cache_entry *new_file,
309 int cached, int match_missing)
310{
311 const struct object_id *oid;
312 unsigned int mode;
313 unsigned dirty_submodule = 0;
314 /*
316 * New file in the index: it might actually be different in
317 * the working tree.
318 */
319 if (get_stat_data(new_file, &oid, &mode, cached, match_missing,
320 &dirty_submodule, &revs->diffopt) < 0)
321 return;
322 diff_index_show_file(revs, "+", new_file, oid, !is_null_oid(oid), mode, dirty_submodule);
324}
325static int show_modified(struct rev_info *revs,
327 const struct cache_entry *old_entry,
328 const struct cache_entry *new_entry,
329 int report_missing,
330 int cached, int match_missing)
331{
332 unsigned int mode, oldmode;
333 const struct object_id *oid;
334 unsigned dirty_submodule = 0;
335 if (get_stat_data(new_entry, &oid, &mode, cached, match_missing,
337 &dirty_submodule, &revs->diffopt) < 0) {
338 if (report_missing)
339 diff_index_show_file(revs, "-", old_entry,
340 &old_entry->oid, 1, old_entry->ce_mode,
341 0);
342 return -1;
343 }
344 if (revs->combine_merges && !cached &&
346 (!oideq(oid, &old_entry->oid) || !oideq(&old_entry->oid, &new_entry->oid))) {
347 struct combine_diff_path *p;
348 int pathlen = ce_namelen(new_entry);
349 p = xmalloc(combine_diff_path_size(2, pathlen));
351 p->path = (char *) &p->parent[2];
352 p->next = NULL;
353 memcpy(p->path, new_entry->name, pathlen);
354 p->path[pathlen] = 0;
355 p->mode = mode;
356 oidclr(&p->oid);
357 memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
358 p->parent[0].status = DIFF_STATUS_MODIFIED;
359 p->parent[0].mode = new_entry->ce_mode;
360 oidcpy(&p->parent[0].oid, &new_entry->oid);
361 p->parent[1].status = DIFF_STATUS_MODIFIED;
362 p->parent[1].mode = old_entry->ce_mode;
363 oidcpy(&p->parent[1].oid, &old_entry->oid);
364 show_combined_diff(p, 2, revs->dense_combined_merges, revs);
365 free(p);
366 return 0;
367 }
368 oldmode = old_entry->ce_mode;
370 if (mode == oldmode && oideq(oid, &old_entry->oid) && !dirty_submodule &&
371 !revs->diffopt.flags.find_copies_harder)
372 return 0;
373 diff_change(&revs->diffopt, oldmode, mode,
375 &old_entry->oid, oid, 1, !is_null_oid(oid),
376 old_entry->name, 0, dirty_submodule);
377 return 0;
378}
379/*
381 * This gets a mix of an existing index and a tree, one pathname entry
382 * at a time. The index entry may be a single stage-0 one, but it could
383 * also be multiple unmerged entries (in which case idx_pos/idx_nr will
384 * give you the position and number of entries in the index).
385 */
386static void do_oneway_diff(struct unpack_trees_options *o,
387 const struct cache_entry *idx,
388 const struct cache_entry *tree)
389{
390 struct rev_info *revs = o->unpack_data;
391 int match_missing, cached;
392 /*
394 * i-t-a entries do not actually exist in the index (if we're
395 * looking at its content)
396 */
397 if (o->index_only &&
398 revs->diffopt.ita_invisible_in_index &&
399 idx && ce_intent_to_add(idx)) {
400 idx = NULL;
401 if (!tree)
402 return; /* nothing to diff.. */
403 }
404 /* if the entry is not checked out, don't examine work tree */
406 cached = o->index_only ||
407 (idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
408 /*
409 * Backward compatibility wart - "diff-index -m" does
410 * not mean "do not ignore merges", but "match_missing".
411 *
412 * But with the revision flag parsing, that's found in
413 * "!revs->ignore_merges".
414 */
415 match_missing = !revs->ignore_merges;
416 if (cached && idx && ce_stage(idx)) {
418 struct diff_filepair *pair;
419 pair = diff_unmerge(&revs->diffopt, idx->name);
420 if (tree)
421 fill_filespec(pair->one, &tree->oid, 1,
422 tree->ce_mode);
423 return;
424 }
425 /*
427 * Something added to the tree?
428 */
429 if (!tree) {
430 show_new_file(revs, idx, cached, match_missing);
431 return;
432 }
433 /*
435 * Something removed from the tree?
436 */
437 if (!idx) {
438 diff_index_show_file(revs, "-", tree, &tree->oid, 1,
439 tree->ce_mode, 0);
440 return;
441 }
442 /* Show difference between old and new */
444 show_modified(revs, tree, idx, 1, cached, match_missing);
445}
446/*
448 * The unpack_trees() interface is designed for merging, so
449 * the different source entries are designed primarily for
450 * the source trees, with the old index being really mainly
451 * used for being replaced by the result.
452 *
453 * For diffing, the index is more important, and we only have a
454 * single tree.
455 *
456 * We're supposed to advance o->pos to skip what we have already processed.
457 *
458 * This wrapper makes it all more readable, and takes care of all
459 * the fairly complex unpack_trees() semantic requirements, including
460 * the skipping, the path matching, the type conflict cases etc.
461 */
462static int oneway_diff(const struct cache_entry * const *src,
463 struct unpack_trees_options *o)
464{
465 const struct cache_entry *idx = src[0];
466 const struct cache_entry *tree = src[1];
467 struct rev_info *revs = o->unpack_data;
468 /*
470 * Unpack-trees generates a DF/conflict entry if
471 * there was a directory in the index and a tree
472 * in the tree. From a diff standpoint, that's a
473 * delete of the tree and a create of the file.
474 */
475 if (tree == o->df_conflict_entry)
476 tree = NULL;
477 if (ce_path_match(revs->diffopt.repo->index,
479 idx ? idx : tree,
480 &revs->prune_data, NULL)) {
481 do_oneway_diff(o, idx, tree);
482 if (diff_can_quit_early(&revs->diffopt)) {
483 o->exiting_early = 1;
484 return -1;
485 }
486 }
487 return 0;
489}
490static int diff_cache(struct rev_info *revs,
492 const struct object_id *tree_oid,
493 const char *tree_name,
494 int cached)
495{
496 struct tree *tree;
497 struct tree_desc t;
498 struct unpack_trees_options opts;
499 tree = parse_tree_indirect(tree_oid);
501 if (!tree)
502 return error("bad tree object %s",
503 tree_name ? tree_name : oid_to_hex(tree_oid));
504 memset(&opts, 0, sizeof(opts));
505 opts.head_idx = 1;
506 opts.index_only = cached;
507 opts.diff_index_cached = (cached &&
508 !revs->diffopt.flags.find_copies_harder);
509 opts.merge = 1;
510 opts.fn = oneway_diff;
511 opts.unpack_data = revs;
512 opts.src_index = revs->diffopt.repo->index;
513 opts.dst_index = NULL;
514 opts.pathspec = &revs->diffopt.pathspec;
515 opts.pathspec->recursive = 1;
516 init_tree_desc(&t, tree->buffer, tree->size);
518 return unpack_trees(1, &t, &opts);
519}
520int run_diff_index(struct rev_info *revs, int cached)
522{
523 struct object_array_entry *ent;
524 if (revs->pending.nr != 1)
526 BUG("run_diff_index must be passed exactly one tree");
527 trace_performance_enter();
529 ent = revs->pending.objects;
530 if (diff_cache(revs, &ent->item->oid, ent->name, cached))
531 exit(128);
532 diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/");
534 diffcore_fix_diff_index(&revs->diffopt);
535 diffcore_std(&revs->diffopt);
536 diff_flush(&revs->diffopt);
537 trace_performance_leave("diff-index");
538 return 0;
539}
540int do_diff_cache(const struct object_id *tree_oid, struct diff_options *opt)
542{
543 struct rev_info revs;
544 repo_init_revisions(opt->repo, &revs, NULL);
546 copy_pathspec(&revs.prune_data, &opt->pathspec);
547 revs.diffopt = *opt;
548 if (diff_cache(&revs, tree_oid, NULL, 1))
550 exit(128);
551 return 0;
552}
553int index_differs_from(struct repository *r,
555 const char *def, const struct diff_flags *flags,
556 int ita_invisible_in_index)
557{
558 struct rev_info rev;
559 struct setup_revision_opt opt;
560 repo_init_revisions(r, &rev, NULL);
562 memset(&opt, 0, sizeof(opt));
563 opt.def = def;
564 setup_revisions(0, NULL, &rev, &opt);
565 rev.diffopt.flags.quick = 1;
566 rev.diffopt.flags.exit_with_status = 1;
567 if (flags)
568 diff_flags_or(&rev.diffopt.flags, flags);
569 rev.diffopt.ita_invisible_in_index = ita_invisible_in_index;
570 run_diff_index(&rev, 1);
571 object_array_clear(&rev.pending);
572 return (rev.diffopt.flags.has_changes != 0);
573}