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/*
17 * diff-files
18 */
19/*
21 * Has the work tree entity been removed?
22 *
23 * Return 1 if it was removed from the work tree, 0 if an entity to be
24 * compared with the cache entry ce still exists (the latter includes
25 * the case where a directory that is not a submodule repository
26 * exists for ce that is a submodule -- it is a submodule that is not
27 * checked out). Return negative for an error.
28 */
29static int check_removed(const struct cache_entry *ce, struct stat *st)
30{
31 if (lstat(ce->name, st) < 0) {
32 if (!is_missing_file_error(errno))
33 return -1;
34 return 1;
35 }
36 if (has_symlink_leading_path(ce->name, ce_namelen(ce)))
37 return 1;
38 if (S_ISDIR(st->st_mode)) {
39 unsigned char sub[20];
40 /*
42 * If ce is already a gitlink, we can have a plain
43 * directory (i.e. the submodule is not checked out),
44 * or a checked out submodule. Either case this is not
45 * a case where something was removed from the work tree,
46 * so we will return 0.
47 *
48 * Otherwise, if the directory is not a submodule
49 * repository, that means ce which was a blob turned into
50 * a directory --- the blob was removed!
51 */
52 if (!S_ISGITLINK(ce->ce_mode) &&
53 resolve_gitlink_ref(ce->name, "HEAD", sub))
54 return 1;
55 }
56 return 0;
57}
58/*
60 * Has a file changed or has a submodule new commits or a dirty work tree?
61 *
62 * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
63 * option is set, the caller does not only want to know if a submodule is
64 * modified at all but wants to know all the conditions that are met (new
65 * commits, untracked content and/or modified content).
66 */
67static int match_stat_with_submodule(struct diff_options *diffopt,
68 const struct cache_entry *ce,
69 struct stat *st, unsigned ce_option,
70 unsigned *dirty_submodule)
71{
72 int changed = ce_match_stat(ce, st, ce_option);
73 if (S_ISGITLINK(ce->ce_mode)) {
74 unsigned orig_flags = diffopt->flags;
75 if (!DIFF_OPT_TST(diffopt, OVERRIDE_SUBMODULE_CONFIG))
76 set_diffopt_flags_from_submodule_config(diffopt, ce->name);
77 if (DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES))
78 changed = 0;
79 else if (!DIFF_OPT_TST(diffopt, IGNORE_DIRTY_SUBMODULES)
80 && (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES)))
81 *dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES));
82 diffopt->flags = orig_flags;
83 }
84 return changed;
85}
86int run_diff_files(struct rev_info *revs, unsigned int option)
88{
89 int entries, i;
90 int diff_unmerged_stage = revs->max_count;
91 unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
92 ? CE_MATCH_RACY_IS_DIRTY : 0);
93 diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
95 if (diff_unmerged_stage < 0)
97 diff_unmerged_stage = 2;
98 entries = active_nr;
99 for (i = 0; i < entries; i++) {
100 unsigned int oldmode, newmode;
101 struct cache_entry *ce = active_cache[i];
102 int changed;
103 unsigned dirty_submodule = 0;
104 const struct object_id *old_oid, *new_oid;
105 if (diff_can_quit_early(&revs->diffopt))
107 break;
108 if (!ce_path_match(ce, &revs->prune_data, NULL))
110 continue;
111 if (ce_stage(ce)) {
113 struct combine_diff_path *dpath;
114 struct diff_filepair *pair;
115 unsigned int wt_mode = 0;
116 int num_compare_stages = 0;
117 size_t path_len;
118 struct stat st;
119 path_len = ce_namelen(ce);
121 dpath = xmalloc(combine_diff_path_size(5, path_len));
123 dpath->path = (char *) &(dpath->parent[5]);
124 dpath->next = NULL;
126 memcpy(dpath->path, ce->name, path_len);
127 dpath->path[path_len] = '\0';
128 oidclr(&dpath->oid);
129 memset(&(dpath->parent[0]), 0,
130 sizeof(struct combine_diff_parent)*5);
131 changed = check_removed(ce, &st);
133 if (!changed)
134 wt_mode = ce_mode_from_stat(ce, st.st_mode);
135 else {
136 if (changed < 0) {
137 perror(ce->name);
138 continue;
139 }
140 wt_mode = 0;
141 }
142 dpath->mode = wt_mode;
143 while (i < entries) {
145 struct cache_entry *nce = active_cache[i];
146 int stage;
147 if (strcmp(ce->name, nce->name))
149 break;
150 /* Stage #2 (ours) is the first parent,
152 * stage #3 (theirs) is the second.
153 */
154 stage = ce_stage(nce);
155 if (2 <= stage) {
156 int mode = nce->ce_mode;
157 num_compare_stages++;
158 oidcpy(&dpath->parent[stage - 2].oid,
159 &nce->oid);
160 dpath->parent[stage-2].mode = ce_mode_from_stat(nce, mode);
161 dpath->parent[stage-2].status =
162 DIFF_STATUS_MODIFIED;
163 }
164 /* diff against the proper unmerged stage */
166 if (stage == diff_unmerged_stage)
167 ce = nce;
168 i++;
169 }
170 /*
171 * Compensate for loop update
172 */
173 i--;
174 if (revs->combine_merges && num_compare_stages == 2) {
176 show_combined_diff(dpath, 2,
177 revs->dense_combined_merges,
178 revs);
179 free(dpath);
180 continue;
181 }
182 FREE_AND_NULL(dpath);
183 /*
185 * Show the diff for the 'ce' if we found the one
186 * from the desired stage.
187 */
188 pair = diff_unmerge(&revs->diffopt, ce->name);
189 if (wt_mode)
190 pair->two->mode = wt_mode;
191 if (ce_stage(ce) != diff_unmerged_stage)
192 continue;
193 }
194 if (ce_uptodate(ce) || ce_skip_worktree(ce))
196 continue;
197 /* If CE_VALID is set, don't look at workdir for file removal */
199 if (ce->ce_flags & CE_VALID) {
200 changed = 0;
201 newmode = ce->ce_mode;
202 } else {
203 struct stat st;
204 changed = check_removed(ce, &st);
206 if (changed) {
207 if (changed < 0) {
208 perror(ce->name);
209 continue;
210 }
211 diff_addremove(&revs->diffopt, '-', ce->ce_mode,
212 &ce->oid,
213 !is_null_oid(&ce->oid),
214 ce->name, 0);
215 continue;
216 } else if (revs->diffopt.ita_invisible_in_index &&
217 ce_intent_to_add(ce)) {
218 diff_addremove(&revs->diffopt, '+', ce->ce_mode,
219 &empty_tree_oid, 0,
220 ce->name, 0);
221 continue;
222 }
223 changed = match_stat_with_submodule(&revs->diffopt, ce, &st,
225 ce_option, &dirty_submodule);
226 newmode = ce_mode_from_stat(ce, st.st_mode);
227 }
228 if (!changed && !dirty_submodule) {
230 ce_mark_uptodate(ce);
231 if (!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
232 continue;
233 }
234 oldmode = ce->ce_mode;
235 old_oid = &ce->oid;
236 new_oid = changed ? &null_oid : &ce->oid;
237 diff_change(&revs->diffopt, oldmode, newmode,
238 old_oid, new_oid,
239 !is_null_oid(old_oid),
240 !is_null_oid(new_oid),
241 ce->name, 0, dirty_submodule);
242 }
244 diffcore_std(&revs->diffopt);
245 diff_flush(&revs->diffopt);
246 return 0;
247}
248/*
250 * diff-index
251 */
252/* A file entry went away or appeared */
254static void diff_index_show_file(struct rev_info *revs,
255 const char *prefix,
256 const struct cache_entry *ce,
257 const struct object_id *oid, int oid_valid,
258 unsigned int mode,
259 unsigned dirty_submodule)
260{
261 diff_addremove(&revs->diffopt, prefix[0], mode,
262 oid, oid_valid, ce->name, dirty_submodule);
263}
264static int get_stat_data(const struct cache_entry *ce,
266 const struct object_id **oidp,
267 unsigned int *modep,
268 int cached, int match_missing,
269 unsigned *dirty_submodule, struct diff_options *diffopt)
270{
271 const struct object_id *oid = &ce->oid;
272 unsigned int mode = ce->ce_mode;
273 if (!cached && !ce_uptodate(ce)) {
275 int changed;
276 struct stat st;
277 changed = check_removed(ce, &st);
278 if (changed < 0)
279 return -1;
280 else if (changed) {
281 if (match_missing) {
282 *oidp = oid;
283 *modep = mode;
284 return 0;
285 }
286 return -1;
287 }
288 changed = match_stat_with_submodule(diffopt, ce, &st,
289 0, dirty_submodule);
290 if (changed) {
291 mode = ce_mode_from_stat(ce, st.st_mode);
292 oid = &null_oid;
293 }
294 }
295 *oidp = oid;
297 *modep = mode;
298 return 0;
299}
300static void show_new_file(struct rev_info *revs,
302 const struct cache_entry *new,
303 int cached, int match_missing)
304{
305 const struct object_id *oid;
306 unsigned int mode;
307 unsigned dirty_submodule = 0;
308 /*
310 * New file in the index: it might actually be different in
311 * the working tree.
312 */
313 if (get_stat_data(new, &oid, &mode, cached, match_missing,
314 &dirty_submodule, &revs->diffopt) < 0)
315 return;
316 diff_index_show_file(revs, "+", new, oid, !is_null_oid(oid), mode, dirty_submodule);
318}
319static int show_modified(struct rev_info *revs,
321 const struct cache_entry *old,
322 const struct cache_entry *new,
323 int report_missing,
324 int cached, int match_missing)
325{
326 unsigned int mode, oldmode;
327 const struct object_id *oid;
328 unsigned dirty_submodule = 0;
329 if (get_stat_data(new, &oid, &mode, cached, match_missing,
331 &dirty_submodule, &revs->diffopt) < 0) {
332 if (report_missing)
333 diff_index_show_file(revs, "-", old,
334 &old->oid, 1, old->ce_mode,
335 0);
336 return -1;
337 }
338 if (revs->combine_merges && !cached &&
340 (oidcmp(oid, &old->oid) || oidcmp(&old->oid, &new->oid))) {
341 struct combine_diff_path *p;
342 int pathlen = ce_namelen(new);
343 p = xmalloc(combine_diff_path_size(2, pathlen));
345 p->path = (char *) &p->parent[2];
346 p->next = NULL;
347 memcpy(p->path, new->name, pathlen);
348 p->path[pathlen] = 0;
349 p->mode = mode;
350 oidclr(&p->oid);
351 memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
352 p->parent[0].status = DIFF_STATUS_MODIFIED;
353 p->parent[0].mode = new->ce_mode;
354 oidcpy(&p->parent[0].oid, &new->oid);
355 p->parent[1].status = DIFF_STATUS_MODIFIED;
356 p->parent[1].mode = old->ce_mode;
357 oidcpy(&p->parent[1].oid, &old->oid);
358 show_combined_diff(p, 2, revs->dense_combined_merges, revs);
359 free(p);
360 return 0;
361 }
362 oldmode = old->ce_mode;
364 if (mode == oldmode && !oidcmp(oid, &old->oid) && !dirty_submodule &&
365 !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
366 return 0;
367 diff_change(&revs->diffopt, oldmode, mode,
369 &old->oid, oid, 1, !is_null_oid(oid),
370 old->name, 0, dirty_submodule);
371 return 0;
372}
373/*
375 * This gets a mix of an existing index and a tree, one pathname entry
376 * at a time. The index entry may be a single stage-0 one, but it could
377 * also be multiple unmerged entries (in which case idx_pos/idx_nr will
378 * give you the position and number of entries in the index).
379 */
380static void do_oneway_diff(struct unpack_trees_options *o,
381 const struct cache_entry *idx,
382 const struct cache_entry *tree)
383{
384 struct rev_info *revs = o->unpack_data;
385 int match_missing, cached;
386 /* i-t-a entries do not actually exist in the index */
388 if (revs->diffopt.ita_invisible_in_index &&
389 idx && ce_intent_to_add(idx)) {
390 idx = NULL;
391 if (!tree)
392 return; /* nothing to diff.. */
393 }
394 /* if the entry is not checked out, don't examine work tree */
396 cached = o->index_only ||
397 (idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
398 /*
399 * Backward compatibility wart - "diff-index -m" does
400 * not mean "do not ignore merges", but "match_missing".
401 *
402 * But with the revision flag parsing, that's found in
403 * "!revs->ignore_merges".
404 */
405 match_missing = !revs->ignore_merges;
406 if (cached && idx && ce_stage(idx)) {
408 struct diff_filepair *pair;
409 pair = diff_unmerge(&revs->diffopt, idx->name);
410 if (tree)
411 fill_filespec(pair->one, &tree->oid, 1,
412 tree->ce_mode);
413 return;
414 }
415 /*
417 * Something added to the tree?
418 */
419 if (!tree) {
420 show_new_file(revs, idx, cached, match_missing);
421 return;
422 }
423 /*
425 * Something removed from the tree?
426 */
427 if (!idx) {
428 diff_index_show_file(revs, "-", tree, &tree->oid, 1,
429 tree->ce_mode, 0);
430 return;
431 }
432 /* Show difference between old and new */
434 show_modified(revs, tree, idx, 1, cached, match_missing);
435}
436/*
438 * The unpack_trees() interface is designed for merging, so
439 * the different source entries are designed primarily for
440 * the source trees, with the old index being really mainly
441 * used for being replaced by the result.
442 *
443 * For diffing, the index is more important, and we only have a
444 * single tree.
445 *
446 * We're supposed to advance o->pos to skip what we have already processed.
447 *
448 * This wrapper makes it all more readable, and takes care of all
449 * the fairly complex unpack_trees() semantic requirements, including
450 * the skipping, the path matching, the type conflict cases etc.
451 */
452static int oneway_diff(const struct cache_entry * const *src,
453 struct unpack_trees_options *o)
454{
455 const struct cache_entry *idx = src[0];
456 const struct cache_entry *tree = src[1];
457 struct rev_info *revs = o->unpack_data;
458 /*
460 * Unpack-trees generates a DF/conflict entry if
461 * there was a directory in the index and a tree
462 * in the tree. From a diff standpoint, that's a
463 * delete of the tree and a create of the file.
464 */
465 if (tree == o->df_conflict_entry)
466 tree = NULL;
467 if (ce_path_match(idx ? idx : tree, &revs->prune_data, NULL)) {
469 do_oneway_diff(o, idx, tree);
470 if (diff_can_quit_early(&revs->diffopt)) {
471 o->exiting_early = 1;
472 return -1;
473 }
474 }
475 return 0;
477}
478static int diff_cache(struct rev_info *revs,
480 const struct object_id *tree_oid,
481 const char *tree_name,
482 int cached)
483{
484 struct tree *tree;
485 struct tree_desc t;
486 struct unpack_trees_options opts;
487 tree = parse_tree_indirect(tree_oid);
489 if (!tree)
490 return error("bad tree object %s",
491 tree_name ? tree_name : oid_to_hex(tree_oid));
492 memset(&opts, 0, sizeof(opts));
493 opts.head_idx = 1;
494 opts.index_only = cached;
495 opts.diff_index_cached = (cached &&
496 !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER));
497 opts.merge = 1;
498 opts.fn = oneway_diff;
499 opts.unpack_data = revs;
500 opts.src_index = &the_index;
501 opts.dst_index = NULL;
502 opts.pathspec = &revs->diffopt.pathspec;
503 opts.pathspec->recursive = 1;
504 init_tree_desc(&t, tree->buffer, tree->size);
506 return unpack_trees(1, &t, &opts);
507}
508int run_diff_index(struct rev_info *revs, int cached)
510{
511 struct object_array_entry *ent;
512 ent = revs->pending.objects;
514 if (diff_cache(revs, &ent->item->oid, ent->name, cached))
515 exit(128);
516 diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/");
518 diffcore_fix_diff_index(&revs->diffopt);
519 diffcore_std(&revs->diffopt);
520 diff_flush(&revs->diffopt);
521 return 0;
522}
523int do_diff_cache(const struct object_id *tree_oid, struct diff_options *opt)
525{
526 struct rev_info revs;
527 init_revisions(&revs, NULL);
529 copy_pathspec(&revs.prune_data, &opt->pathspec);
530 revs.diffopt = *opt;
531 if (diff_cache(&revs, tree_oid, NULL, 1))
533 exit(128);
534 return 0;
535}
536int index_differs_from(const char *def, int diff_flags,
538 int ita_invisible_in_index)
539{
540 struct rev_info rev;
541 struct setup_revision_opt opt;
542 init_revisions(&rev, NULL);
544 memset(&opt, 0, sizeof(opt));
545 opt.def = def;
546 setup_revisions(0, NULL, &rev, &opt);
547 DIFF_OPT_SET(&rev.diffopt, QUICK);
548 DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
549 rev.diffopt.flags |= diff_flags;
550 rev.diffopt.ita_invisible_in_index = ita_invisible_in_index;
551 run_diff_index(&rev, 1);
552 object_array_clear(&rev.pending);
553 return (DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES) != 0);
554}