diff options
Diffstat (limited to 'diff-lib.c')
| -rw-r--r-- | diff-lib.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/diff-lib.c b/diff-lib.c new file mode 100644 index 0000000000..bc49c708c1 --- /dev/null +++ b/diff-lib.c @@ -0,0 +1,535 @@ +/* + * 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" +#include "dir.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, + const 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; + 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++) { + unsigned int oldmode, newmode; + struct cache_entry *ce = active_cache[i]; + int changed; + unsigned dirty_submodule = 0; + const unsigned char *old_sha1, *new_sha1; + + if (diff_can_quit_early(&revs->diffopt)) + break; + + if (!ce_path_match(ce, &revs->prune_data, NULL)) + 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; + struct stat st; + + path_len = ce_namelen(ce); + + dpath = xmalloc(combine_diff_path_size(5, path_len)); + dpath->path = (char *) &(dpath->parent[5]); + + dpath->next = NULL; + memcpy(dpath->path, ce->name, path_len); + dpath->path[path_len] = '\0'; + oidclr(&dpath->oid); + 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; + } + 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].oid.hash, 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 */ + if (ce->ce_flags & CE_VALID) { + changed = 0; + newmode = ce->ce_mode; + } else { + struct stat st; + + changed = check_removed(ce, &st); + if (changed) { + if (changed < 0) { + perror(ce->name); + continue; + } + diff_addremove(&revs->diffopt, '-', ce->ce_mode, + ce->sha1, !is_null_sha1(ce->sha1), + ce->name, 0); + continue; + } + + changed = match_stat_with_submodule(&revs->diffopt, ce, &st, + ce_option, &dirty_submodule); + newmode = ce_mode_from_stat(ce, st.st_mode); + } + + if (!changed && !dirty_submodule) { + ce_mark_uptodate(ce); + if (!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER)) + continue; + } + oldmode = ce->ce_mode; + old_sha1 = ce->sha1; + new_sha1 = changed ? null_sha1 : ce->sha1; + diff_change(&revs->diffopt, oldmode, newmode, + old_sha1, new_sha1, + !is_null_sha1(old_sha1), + !is_null_sha1(new_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, + const struct cache_entry *ce, + const unsigned char *sha1, int sha1_valid, + unsigned int mode, + unsigned dirty_submodule) +{ + diff_addremove(&revs->diffopt, prefix[0], mode, + sha1, sha1_valid, ce->name, dirty_submodule); +} + +static int get_stat_data(const 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, + const 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 tree. + */ + if (get_stat_data(new, &sha1, &mode, cached, match_missing, + &dirty_submodule, &revs->diffopt) < 0) + return; + + diff_index_show_file(revs, "+", new, sha1, !is_null_sha1(sha1), mode, dirty_submodule); +} + +static int show_modified(struct rev_info *revs, + const struct cache_entry *old, + const 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, 1, 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; + memcpy(p->path, new->name, pathlen); + p->path[pathlen] = 0; + p->mode = mode; + oidclr(&p->oid); + 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].oid.hash, new->sha1); + p->parent[1].status = DIFF_STATUS_MODIFIED; + p->parent[1].mode = old->ce_mode; + hashcpy(p->parent[1].oid.hash, 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, 1, !is_null_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, + const struct cache_entry *idx, + const 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, 1, 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, 1, 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(const struct cache_entry * const *src, + struct unpack_trees_options *o) +{ + const struct cache_entry *idx = src[0]; + const 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, NULL)) { + 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; + opts.pathspec = &revs->diffopt.pathspec; + opts.pathspec->recursive = 1; + + 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->oid.hash, 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); + copy_pathspec(&revs.prune_data, &opt->pathspec); + 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); +} |