| /* |
| * Copyright (C) 2005 Junio C Hamano |
| */ |
| #include "cache.h" |
| #include "quote.h" |
| #include "commit.h" |
| #include "diff.h" |
| #include "diffcore.h" |
| #include "revision.h" |
| #include "cache-tree.h" |
| #include "unpack-trees.h" |
| #include "refs.h" |
| #include "submodule.h" |
| |
| /* |
| * diff-files |
| */ |
| |
| /* |
| * Has the work tree entity been removed? |
| * |
| * Return 1 if it was removed from the work tree, 0 if an entity to be |
| * compared with the cache entry ce still exists (the latter includes |
| * the case where a directory that is not a submodule repository |
| * exists for ce that is a submodule -- it is a submodule that is not |
| * checked out). Return negative for an error. |
| */ |
| static int check_removed(const struct cache_entry *ce, struct stat *st) |
| { |
| if (lstat(ce->name, st) < 0) { |
| if (errno != ENOENT && errno != ENOTDIR) |
| return -1; |
| return 1; |
| } |
| if (has_symlink_leading_path(ce->name, ce_namelen(ce))) |
| return 1; |
| if (S_ISDIR(st->st_mode)) { |
| unsigned char sub[20]; |
| |
| /* |
| * If ce is already a gitlink, we can have a plain |
| * directory (i.e. the submodule is not checked out), |
| * or a checked out submodule. Either case this is not |
| * a case where something was removed from the work tree, |
| * so we will return 0. |
| * |
| * Otherwise, if the directory is not a submodule |
| * repository, that means ce which was a blob turned into |
| * a directory --- the blob was removed! |
| */ |
| if (!S_ISGITLINK(ce->ce_mode) && |
| resolve_gitlink_ref(ce->name, "HEAD", sub)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Has a file changed or has a submodule new commits or a dirty work tree? |
| * |
| * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES |
| * option is set, the caller does not only want to know if a submodule is |
| * modified at all but wants to know all the conditions that are met (new |
| * commits, untracked content and/or modified content). |
| */ |
| static int match_stat_with_submodule(struct diff_options *diffopt, |
| struct cache_entry *ce, struct stat *st, |
| unsigned ce_option, unsigned *dirty_submodule) |
| { |
| int changed = ce_match_stat(ce, st, ce_option); |
| if (S_ISGITLINK(ce->ce_mode)) { |
| unsigned orig_flags = diffopt->flags; |
| if (!DIFF_OPT_TST(diffopt, OVERRIDE_SUBMODULE_CONFIG)) |
| set_diffopt_flags_from_submodule_config(diffopt, ce->name); |
| if (DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES)) |
| changed = 0; |
| else if (!DIFF_OPT_TST(diffopt, IGNORE_DIRTY_SUBMODULES) |
| && (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES))) |
| *dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES)); |
| diffopt->flags = orig_flags; |
| } |
| return changed; |
| } |
| |
| int run_diff_files(struct rev_info *revs, unsigned int option) |
| { |
| int entries, i; |
| int diff_unmerged_stage = revs->max_count; |
| int silent_on_removed = option & DIFF_SILENT_ON_REMOVED; |
| unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED) |
| ? CE_MATCH_RACY_IS_DIRTY : 0); |
| |
| diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/"); |
| |
| if (diff_unmerged_stage < 0) |
| diff_unmerged_stage = 2; |
| entries = active_nr; |
| for (i = 0; i < entries; i++) { |
| struct stat st; |
| unsigned int oldmode, newmode; |
| struct cache_entry *ce = active_cache[i]; |
| int changed; |
| unsigned dirty_submodule = 0; |
| |
| if (diff_can_quit_early(&revs->diffopt)) |
| break; |
| |
| if (!ce_path_match(ce, &revs->prune_data)) |
| continue; |
| |
| if (ce_stage(ce)) { |
| struct combine_diff_path *dpath; |
| struct diff_filepair *pair; |
| unsigned int wt_mode = 0; |
| int num_compare_stages = 0; |
| size_t path_len; |
| |
| path_len = ce_namelen(ce); |
| |
| dpath = xmalloc(combine_diff_path_size(5, path_len)); |
| dpath->path = (char *) &(dpath->parent[5]); |
| |
| dpath->next = NULL; |
| dpath->len = path_len; |
| memcpy(dpath->path, ce->name, path_len); |
| dpath->path[path_len] = '\0'; |
| hashclr(dpath->sha1); |
| memset(&(dpath->parent[0]), 0, |
| sizeof(struct combine_diff_parent)*5); |
| |
| changed = check_removed(ce, &st); |
| if (!changed) |
| wt_mode = ce_mode_from_stat(ce, st.st_mode); |
| else { |
| if (changed < 0) { |
| perror(ce->name); |
| continue; |
| } |
| if (silent_on_removed) |
| continue; |
| wt_mode = 0; |
| } |
| dpath->mode = wt_mode; |
| |
| while (i < entries) { |
| struct cache_entry *nce = active_cache[i]; |
| int stage; |
| |
| if (strcmp(ce->name, nce->name)) |
| break; |
| |
| /* Stage #2 (ours) is the first parent, |
| * stage #3 (theirs) is the second. |
| */ |
| stage = ce_stage(nce); |
| if (2 <= stage) { |
| int mode = nce->ce_mode; |
| num_compare_stages++; |
| hashcpy(dpath->parent[stage-2].sha1, nce->sha1); |
| dpath->parent[stage-2].mode = ce_mode_from_stat(nce, mode); |
| dpath->parent[stage-2].status = |
| DIFF_STATUS_MODIFIED; |
| } |
| |
| /* diff against the proper unmerged stage */ |
| if (stage == diff_unmerged_stage) |
| ce = nce; |
| i++; |
| } |
| /* |
| * Compensate for loop update |
| */ |
| i--; |
| |
| if (revs->combine_merges && num_compare_stages == 2) { |
| show_combined_diff(dpath, 2, |
| revs->dense_combined_merges, |
| revs); |
| free(dpath); |
| continue; |
| } |
| free(dpath); |
| dpath = NULL; |
| |
| /* |
| * Show the diff for the 'ce' if we found the one |
| * from the desired stage. |
| */ |
| pair = diff_unmerge(&revs->diffopt, ce->name); |
| if (wt_mode) |
| pair->two->mode = wt_mode; |
| if (ce_stage(ce) != diff_unmerged_stage) |
| continue; |
| } |
| |
| if (ce_uptodate(ce) || ce_skip_worktree(ce)) |
| continue; |
| |
| /* If CE_VALID is set, don't look at workdir for file removal */ |
| changed = (ce->ce_flags & CE_VALID) ? 0 : check_removed(ce, &st); |
| if (changed) { |
| if (changed < 0) { |
| perror(ce->name); |
| continue; |
| } |
| if (silent_on_removed) |
| continue; |
| diff_addremove(&revs->diffopt, '-', ce->ce_mode, |
| ce->sha1, ce->name, 0); |
| continue; |
| } |
| changed = match_stat_with_submodule(&revs->diffopt, ce, &st, |
| ce_option, &dirty_submodule); |
| if (!changed && !dirty_submodule) { |
| ce_mark_uptodate(ce); |
| if (!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER)) |
| continue; |
| } |
| oldmode = ce->ce_mode; |
| newmode = ce_mode_from_stat(ce, st.st_mode); |
| diff_change(&revs->diffopt, oldmode, newmode, |
| ce->sha1, (changed ? null_sha1 : ce->sha1), |
| ce->name, 0, dirty_submodule); |
| |
| } |
| diffcore_std(&revs->diffopt); |
| diff_flush(&revs->diffopt); |
| return 0; |
| } |
| |
| /* |
| * diff-index |
| */ |
| |
| /* A file entry went away or appeared */ |
| static void diff_index_show_file(struct rev_info *revs, |
| const char *prefix, |
| struct cache_entry *ce, |
| const unsigned char *sha1, unsigned int mode, |
| unsigned dirty_submodule) |
| { |
| diff_addremove(&revs->diffopt, prefix[0], mode, |
| sha1, ce->name, dirty_submodule); |
| } |
| |
| static int get_stat_data(struct cache_entry *ce, |
| const unsigned char **sha1p, |
| unsigned int *modep, |
| int cached, int match_missing, |
| unsigned *dirty_submodule, struct diff_options *diffopt) |
| { |
| const unsigned char *sha1 = ce->sha1; |
| unsigned int mode = ce->ce_mode; |
| |
| if (!cached && !ce_uptodate(ce)) { |
| int changed; |
| struct stat st; |
| changed = check_removed(ce, &st); |
| if (changed < 0) |
| return -1; |
| else if (changed) { |
| if (match_missing) { |
| *sha1p = sha1; |
| *modep = mode; |
| return 0; |
| } |
| return -1; |
| } |
| changed = match_stat_with_submodule(diffopt, ce, &st, |
| 0, dirty_submodule); |
| if (changed) { |
| mode = ce_mode_from_stat(ce, st.st_mode); |
| sha1 = null_sha1; |
| } |
| } |
| |
| *sha1p = sha1; |
| *modep = mode; |
| return 0; |
| } |
| |
| static void show_new_file(struct rev_info *revs, |
| struct cache_entry *new, |
| int cached, int match_missing) |
| { |
| const unsigned char *sha1; |
| unsigned int mode; |
| unsigned dirty_submodule = 0; |
| |
| /* |
| * New file in the index: it might actually be different in |
| * the working copy. |
| */ |
| if (get_stat_data(new, &sha1, &mode, cached, match_missing, |
| &dirty_submodule, &revs->diffopt) < 0) |
| return; |
| |
| diff_index_show_file(revs, "+", new, sha1, mode, dirty_submodule); |
| } |
| |
| static int show_modified(struct rev_info *revs, |
| struct cache_entry *old, |
| struct cache_entry *new, |
| int report_missing, |
| int cached, int match_missing) |
| { |
| unsigned int mode, oldmode; |
| const unsigned char *sha1; |
| unsigned dirty_submodule = 0; |
| |
| if (get_stat_data(new, &sha1, &mode, cached, match_missing, |
| &dirty_submodule, &revs->diffopt) < 0) { |
| if (report_missing) |
| diff_index_show_file(revs, "-", old, |
| old->sha1, old->ce_mode, 0); |
| return -1; |
| } |
| |
| if (revs->combine_merges && !cached && |
| (hashcmp(sha1, old->sha1) || hashcmp(old->sha1, new->sha1))) { |
| struct combine_diff_path *p; |
| int pathlen = ce_namelen(new); |
| |
| p = xmalloc(combine_diff_path_size(2, pathlen)); |
| p->path = (char *) &p->parent[2]; |
| p->next = NULL; |
| p->len = pathlen; |
| memcpy(p->path, new->name, pathlen); |
| p->path[pathlen] = 0; |
| p->mode = mode; |
| hashclr(p->sha1); |
| memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent)); |
| p->parent[0].status = DIFF_STATUS_MODIFIED; |
| p->parent[0].mode = new->ce_mode; |
| hashcpy(p->parent[0].sha1, new->sha1); |
| p->parent[1].status = DIFF_STATUS_MODIFIED; |
| p->parent[1].mode = old->ce_mode; |
| hashcpy(p->parent[1].sha1, old->sha1); |
| show_combined_diff(p, 2, revs->dense_combined_merges, revs); |
| free(p); |
| return 0; |
| } |
| |
| oldmode = old->ce_mode; |
| if (mode == oldmode && !hashcmp(sha1, old->sha1) && !dirty_submodule && |
| !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER)) |
| return 0; |
| |
| diff_change(&revs->diffopt, oldmode, mode, |
| old->sha1, sha1, old->name, 0, dirty_submodule); |
| return 0; |
| } |
| |
| /* |
| * This gets a mix of an existing index and a tree, one pathname entry |
| * at a time. The index entry may be a single stage-0 one, but it could |
| * also be multiple unmerged entries (in which case idx_pos/idx_nr will |
| * give you the position and number of entries in the index). |
| */ |
| static void do_oneway_diff(struct unpack_trees_options *o, |
| struct cache_entry *idx, |
| struct cache_entry *tree) |
| { |
| struct rev_info *revs = o->unpack_data; |
| int match_missing, cached; |
| |
| /* if the entry is not checked out, don't examine work tree */ |
| cached = o->index_only || |
| (idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx))); |
| /* |
| * Backward compatibility wart - "diff-index -m" does |
| * not mean "do not ignore merges", but "match_missing". |
| * |
| * But with the revision flag parsing, that's found in |
| * "!revs->ignore_merges". |
| */ |
| match_missing = !revs->ignore_merges; |
| |
| if (cached && idx && ce_stage(idx)) { |
| struct diff_filepair *pair; |
| pair = diff_unmerge(&revs->diffopt, idx->name); |
| if (tree) |
| fill_filespec(pair->one, tree->sha1, tree->ce_mode); |
| return; |
| } |
| |
| /* |
| * Something added to the tree? |
| */ |
| if (!tree) { |
| show_new_file(revs, idx, cached, match_missing); |
| return; |
| } |
| |
| /* |
| * Something removed from the tree? |
| */ |
| if (!idx) { |
| diff_index_show_file(revs, "-", tree, tree->sha1, tree->ce_mode, 0); |
| return; |
| } |
| |
| /* Show difference between old and new */ |
| show_modified(revs, tree, idx, 1, cached, match_missing); |
| } |
| |
| /* |
| * The unpack_trees() interface is designed for merging, so |
| * the different source entries are designed primarily for |
| * the source trees, with the old index being really mainly |
| * used for being replaced by the result. |
| * |
| * For diffing, the index is more important, and we only have a |
| * single tree. |
| * |
| * We're supposed to advance o->pos to skip what we have already processed. |
| * |
| * This wrapper makes it all more readable, and takes care of all |
| * the fairly complex unpack_trees() semantic requirements, including |
| * the skipping, the path matching, the type conflict cases etc. |
| */ |
| static int oneway_diff(struct cache_entry **src, struct unpack_trees_options *o) |
| { |
| struct cache_entry *idx = src[0]; |
| struct cache_entry *tree = src[1]; |
| struct rev_info *revs = o->unpack_data; |
| |
| /* |
| * Unpack-trees generates a DF/conflict entry if |
| * there was a directory in the index and a tree |
| * in the tree. From a diff standpoint, that's a |
| * delete of the tree and a create of the file. |
| */ |
| if (tree == o->df_conflict_entry) |
| tree = NULL; |
| |
| if (ce_path_match(idx ? idx : tree, &revs->prune_data)) { |
| do_oneway_diff(o, idx, tree); |
| if (diff_can_quit_early(&revs->diffopt)) { |
| o->exiting_early = 1; |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int diff_cache(struct rev_info *revs, |
| const unsigned char *tree_sha1, |
| const char *tree_name, |
| int cached) |
| { |
| struct tree *tree; |
| struct tree_desc t; |
| struct unpack_trees_options opts; |
| |
| tree = parse_tree_indirect(tree_sha1); |
| if (!tree) |
| return error("bad tree object %s", |
| tree_name ? tree_name : sha1_to_hex(tree_sha1)); |
| memset(&opts, 0, sizeof(opts)); |
| opts.head_idx = 1; |
| opts.index_only = cached; |
| opts.diff_index_cached = (cached && |
| !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER)); |
| opts.merge = 1; |
| opts.fn = oneway_diff; |
| opts.unpack_data = revs; |
| opts.src_index = &the_index; |
| opts.dst_index = NULL; |
| |
| init_tree_desc(&t, tree->buffer, tree->size); |
| return unpack_trees(1, &t, &opts); |
| } |
| |
| int run_diff_index(struct rev_info *revs, int cached) |
| { |
| struct object_array_entry *ent; |
| |
| ent = revs->pending.objects; |
| if (diff_cache(revs, ent->item->sha1, ent->name, cached)) |
| exit(128); |
| |
| diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/"); |
| diffcore_fix_diff_index(&revs->diffopt); |
| diffcore_std(&revs->diffopt); |
| diff_flush(&revs->diffopt); |
| return 0; |
| } |
| |
| int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt) |
| { |
| struct rev_info revs; |
| |
| init_revisions(&revs, NULL); |
| init_pathspec(&revs.prune_data, opt->pathspec.raw); |
| revs.diffopt = *opt; |
| |
| if (diff_cache(&revs, tree_sha1, NULL, 1)) |
| exit(128); |
| return 0; |
| } |
| |
| int index_differs_from(const char *def, int diff_flags) |
| { |
| struct rev_info rev; |
| struct setup_revision_opt opt; |
| |
| init_revisions(&rev, NULL); |
| memset(&opt, 0, sizeof(opt)); |
| opt.def = def; |
| setup_revisions(0, NULL, &rev, &opt); |
| DIFF_OPT_SET(&rev.diffopt, QUICK); |
| DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS); |
| rev.diffopt.flags |= diff_flags; |
| run_diff_index(&rev, 1); |
| if (rev.pending.alloc) |
| free(rev.pending.objects); |
| return (DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES) != 0); |
| } |