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![Jeff King](/assets/img/avatar_default.png)
The diff code provides a format_callback interface, but not every callback needs each parameter (e.g., the "opt" and "data" parameters are frequently left unused). Likewise for the output_prefix callback, the low-level change/add_remove interfaces, the callbacks used by xdi_diff(), etc. Mark unused arguments in the callback implementations to quiet -Wunused-parameter. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
700 lines
19 KiB
C
700 lines
19 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "quote.h"
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#include "commit.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "revision.h"
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#include "cache-tree.h"
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#include "unpack-trees.h"
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#include "refs.h"
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#include "submodule.h"
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#include "dir.h"
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#include "fsmonitor.h"
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#include "commit-reach.h"
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/*
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* diff-files
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*/
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/*
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* Has the work tree entity been removed?
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*
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* Return 1 if it was removed from the work tree, 0 if an entity to be
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* compared with the cache entry ce still exists (the latter includes
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* the case where a directory that is not a submodule repository
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* exists for ce that is a submodule -- it is a submodule that is not
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* checked out). Return negative for an error.
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*/
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static int check_removed(const struct index_state *istate, const struct cache_entry *ce, struct stat *st)
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{
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assert(is_fsmonitor_refreshed(istate));
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if (!(ce->ce_flags & CE_FSMONITOR_VALID) && lstat(ce->name, st) < 0) {
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if (!is_missing_file_error(errno))
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return -1;
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return 1;
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}
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if (has_symlink_leading_path(ce->name, ce_namelen(ce)))
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return 1;
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if (S_ISDIR(st->st_mode)) {
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struct object_id sub;
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/*
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* If ce is already a gitlink, we can have a plain
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* directory (i.e. the submodule is not checked out),
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* or a checked out submodule. Either case this is not
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* a case where something was removed from the work tree,
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* so we will return 0.
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*
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* Otherwise, if the directory is not a submodule
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* repository, that means ce which was a blob turned into
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* a directory --- the blob was removed!
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*/
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if (!S_ISGITLINK(ce->ce_mode) &&
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resolve_gitlink_ref(ce->name, "HEAD", &sub))
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return 1;
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}
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return 0;
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}
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/*
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* Has a file changed or has a submodule new commits or a dirty work tree?
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*
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* Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
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* option is set, the caller does not only want to know if a submodule is
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* modified at all but wants to know all the conditions that are met (new
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* commits, untracked content and/or modified content).
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*/
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static int match_stat_with_submodule(struct diff_options *diffopt,
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const struct cache_entry *ce,
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struct stat *st, unsigned ce_option,
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unsigned *dirty_submodule)
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{
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int changed = ie_match_stat(diffopt->repo->index, ce, st, ce_option);
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if (S_ISGITLINK(ce->ce_mode)) {
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struct diff_flags orig_flags = diffopt->flags;
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if (!diffopt->flags.override_submodule_config)
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set_diffopt_flags_from_submodule_config(diffopt, ce->name);
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if (diffopt->flags.ignore_submodules)
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changed = 0;
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else if (!diffopt->flags.ignore_dirty_submodules &&
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(!changed || diffopt->flags.dirty_submodules))
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*dirty_submodule = is_submodule_modified(ce->name,
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diffopt->flags.ignore_untracked_in_submodules);
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diffopt->flags = orig_flags;
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}
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return changed;
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}
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int run_diff_files(struct rev_info *revs, unsigned int option)
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{
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int entries, i;
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int diff_unmerged_stage = revs->max_count;
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unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
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? CE_MATCH_RACY_IS_DIRTY : 0);
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uint64_t start = getnanotime();
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struct index_state *istate = revs->diffopt.repo->index;
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diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
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refresh_fsmonitor(istate);
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if (diff_unmerged_stage < 0)
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diff_unmerged_stage = 2;
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entries = istate->cache_nr;
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for (i = 0; i < entries; i++) {
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unsigned int oldmode, newmode;
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struct cache_entry *ce = istate->cache[i];
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int changed;
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unsigned dirty_submodule = 0;
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const struct object_id *old_oid, *new_oid;
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if (diff_can_quit_early(&revs->diffopt))
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break;
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if (!ce_path_match(istate, ce, &revs->prune_data, NULL))
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continue;
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if (revs->diffopt.prefix &&
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strncmp(ce->name, revs->diffopt.prefix, revs->diffopt.prefix_length))
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continue;
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if (ce_stage(ce)) {
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struct combine_diff_path *dpath;
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struct diff_filepair *pair;
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unsigned int wt_mode = 0;
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int num_compare_stages = 0;
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size_t path_len;
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struct stat st;
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path_len = ce_namelen(ce);
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dpath = xmalloc(combine_diff_path_size(5, path_len));
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dpath->path = (char *) &(dpath->parent[5]);
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dpath->next = NULL;
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memcpy(dpath->path, ce->name, path_len);
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dpath->path[path_len] = '\0';
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oidclr(&dpath->oid);
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memset(&(dpath->parent[0]), 0,
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sizeof(struct combine_diff_parent)*5);
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changed = check_removed(istate, ce, &st);
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if (!changed)
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wt_mode = ce_mode_from_stat(ce, st.st_mode);
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else {
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if (changed < 0) {
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perror(ce->name);
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continue;
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}
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wt_mode = 0;
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}
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dpath->mode = wt_mode;
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while (i < entries) {
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struct cache_entry *nce = istate->cache[i];
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int stage;
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if (strcmp(ce->name, nce->name))
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break;
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/* Stage #2 (ours) is the first parent,
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* stage #3 (theirs) is the second.
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*/
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stage = ce_stage(nce);
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if (2 <= stage) {
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int mode = nce->ce_mode;
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num_compare_stages++;
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oidcpy(&dpath->parent[stage - 2].oid,
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&nce->oid);
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dpath->parent[stage-2].mode = ce_mode_from_stat(nce, mode);
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dpath->parent[stage-2].status =
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DIFF_STATUS_MODIFIED;
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}
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/* diff against the proper unmerged stage */
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if (stage == diff_unmerged_stage)
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ce = nce;
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i++;
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}
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/*
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* Compensate for loop update
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*/
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i--;
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if (revs->combine_merges && num_compare_stages == 2) {
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show_combined_diff(dpath, 2, revs);
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free(dpath);
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continue;
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}
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FREE_AND_NULL(dpath);
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/*
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* Show the diff for the 'ce' if we found the one
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* from the desired stage.
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*/
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pair = diff_unmerge(&revs->diffopt, ce->name);
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if (wt_mode)
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pair->two->mode = wt_mode;
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if (ce_stage(ce) != diff_unmerged_stage)
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continue;
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}
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if (ce_uptodate(ce) || ce_skip_worktree(ce))
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continue;
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/*
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* When CE_VALID is set (via "update-index --assume-unchanged"
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* or via adding paths while core.ignorestat is set to true),
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* the user has promised that the working tree file for that
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* path will not be modified. When CE_FSMONITOR_VALID is true,
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* the fsmonitor knows that the path hasn't been modified since
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* we refreshed the cached stat information. In either case,
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* we do not have to stat to see if the path has been removed
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* or modified.
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*/
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if (ce->ce_flags & (CE_VALID | CE_FSMONITOR_VALID)) {
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changed = 0;
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newmode = ce->ce_mode;
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} else {
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struct stat st;
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changed = check_removed(istate, ce, &st);
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if (changed) {
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if (changed < 0) {
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perror(ce->name);
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continue;
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}
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diff_addremove(&revs->diffopt, '-', ce->ce_mode,
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&ce->oid,
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!is_null_oid(&ce->oid),
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ce->name, 0);
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continue;
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} else if (revs->diffopt.ita_invisible_in_index &&
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ce_intent_to_add(ce)) {
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newmode = ce_mode_from_stat(ce, st.st_mode);
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diff_addremove(&revs->diffopt, '+', newmode,
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null_oid(), 0, ce->name, 0);
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continue;
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}
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changed = match_stat_with_submodule(&revs->diffopt, ce, &st,
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ce_option, &dirty_submodule);
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newmode = ce_mode_from_stat(ce, st.st_mode);
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}
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if (!changed && !dirty_submodule) {
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ce_mark_uptodate(ce);
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mark_fsmonitor_valid(istate, ce);
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if (!revs->diffopt.flags.find_copies_harder)
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continue;
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}
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oldmode = ce->ce_mode;
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old_oid = &ce->oid;
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new_oid = changed ? null_oid() : &ce->oid;
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diff_change(&revs->diffopt, oldmode, newmode,
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old_oid, new_oid,
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!is_null_oid(old_oid),
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!is_null_oid(new_oid),
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ce->name, 0, dirty_submodule);
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}
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diffcore_std(&revs->diffopt);
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diff_flush(&revs->diffopt);
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trace_performance_since(start, "diff-files");
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return 0;
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}
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/*
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* diff-index
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*/
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/* A file entry went away or appeared */
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static void diff_index_show_file(struct rev_info *revs,
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const char *prefix,
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const struct cache_entry *ce,
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const struct object_id *oid, int oid_valid,
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unsigned int mode,
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unsigned dirty_submodule)
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{
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diff_addremove(&revs->diffopt, prefix[0], mode,
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oid, oid_valid, ce->name, dirty_submodule);
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}
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static int get_stat_data(const struct index_state *istate,
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const struct cache_entry *ce,
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const struct object_id **oidp,
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unsigned int *modep,
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int cached, int match_missing,
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unsigned *dirty_submodule, struct diff_options *diffopt)
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{
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const struct object_id *oid = &ce->oid;
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unsigned int mode = ce->ce_mode;
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if (!cached && !ce_uptodate(ce)) {
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int changed;
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struct stat st;
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changed = check_removed(istate, ce, &st);
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if (changed < 0)
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return -1;
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else if (changed) {
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if (match_missing) {
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*oidp = oid;
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*modep = mode;
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return 0;
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}
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return -1;
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}
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changed = match_stat_with_submodule(diffopt, ce, &st,
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0, dirty_submodule);
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if (changed) {
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mode = ce_mode_from_stat(ce, st.st_mode);
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oid = null_oid();
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}
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}
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*oidp = oid;
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*modep = mode;
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return 0;
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}
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static void show_new_file(struct rev_info *revs,
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const struct cache_entry *new_file,
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int cached, int match_missing)
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{
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const struct object_id *oid;
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unsigned int mode;
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unsigned dirty_submodule = 0;
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struct index_state *istate = revs->diffopt.repo->index;
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if (new_file && S_ISSPARSEDIR(new_file->ce_mode)) {
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diff_tree_oid(NULL, &new_file->oid, new_file->name, &revs->diffopt);
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return;
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}
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/*
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* New file in the index: it might actually be different in
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* the working tree.
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*/
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if (get_stat_data(istate, new_file, &oid, &mode, cached, match_missing,
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&dirty_submodule, &revs->diffopt) < 0)
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return;
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diff_index_show_file(revs, "+", new_file, oid, !is_null_oid(oid), mode, dirty_submodule);
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}
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static int show_modified(struct rev_info *revs,
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const struct cache_entry *old_entry,
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const struct cache_entry *new_entry,
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int report_missing,
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int cached, int match_missing)
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{
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unsigned int mode, oldmode;
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const struct object_id *oid;
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unsigned dirty_submodule = 0;
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struct index_state *istate = revs->diffopt.repo->index;
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assert(S_ISSPARSEDIR(old_entry->ce_mode) ==
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S_ISSPARSEDIR(new_entry->ce_mode));
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/*
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* If both are sparse directory entries, then expand the
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* modifications to the file level. If only one was a sparse
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* directory, then they appear as an add and delete instead of
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* a modification.
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*/
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if (S_ISSPARSEDIR(new_entry->ce_mode)) {
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diff_tree_oid(&old_entry->oid, &new_entry->oid, new_entry->name, &revs->diffopt);
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return 0;
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}
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if (get_stat_data(istate, new_entry, &oid, &mode, cached, match_missing,
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&dirty_submodule, &revs->diffopt) < 0) {
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if (report_missing)
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diff_index_show_file(revs, "-", old_entry,
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&old_entry->oid, 1, old_entry->ce_mode,
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0);
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return -1;
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}
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if (revs->combine_merges && !cached &&
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(!oideq(oid, &old_entry->oid) || !oideq(&old_entry->oid, &new_entry->oid))) {
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struct combine_diff_path *p;
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int pathlen = ce_namelen(new_entry);
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p = xmalloc(combine_diff_path_size(2, pathlen));
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p->path = (char *) &p->parent[2];
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p->next = NULL;
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memcpy(p->path, new_entry->name, pathlen);
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p->path[pathlen] = 0;
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p->mode = mode;
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oidclr(&p->oid);
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memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
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p->parent[0].status = DIFF_STATUS_MODIFIED;
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p->parent[0].mode = new_entry->ce_mode;
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oidcpy(&p->parent[0].oid, &new_entry->oid);
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p->parent[1].status = DIFF_STATUS_MODIFIED;
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p->parent[1].mode = old_entry->ce_mode;
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oidcpy(&p->parent[1].oid, &old_entry->oid);
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show_combined_diff(p, 2, revs);
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free(p);
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return 0;
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}
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oldmode = old_entry->ce_mode;
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if (mode == oldmode && oideq(oid, &old_entry->oid) && !dirty_submodule &&
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!revs->diffopt.flags.find_copies_harder)
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return 0;
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diff_change(&revs->diffopt, oldmode, mode,
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&old_entry->oid, oid, 1, !is_null_oid(oid),
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old_entry->name, 0, dirty_submodule);
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return 0;
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}
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/*
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* This gets a mix of an existing index and a tree, one pathname entry
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* at a time. The index entry may be a single stage-0 one, but it could
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* also be multiple unmerged entries (in which case idx_pos/idx_nr will
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* give you the position and number of entries in the index).
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*/
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static void do_oneway_diff(struct unpack_trees_options *o,
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const struct cache_entry *idx,
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const struct cache_entry *tree)
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{
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struct rev_info *revs = o->unpack_data;
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int match_missing, cached;
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/*
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* i-t-a entries do not actually exist in the index (if we're
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* looking at its content)
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*/
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if (o->index_only &&
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revs->diffopt.ita_invisible_in_index &&
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idx && ce_intent_to_add(idx)) {
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idx = NULL;
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if (!tree)
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return; /* nothing to diff.. */
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}
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/* if the entry is not checked out, don't examine work tree */
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cached = o->index_only ||
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(idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
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match_missing = revs->match_missing;
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if (cached && idx && ce_stage(idx)) {
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struct diff_filepair *pair;
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pair = diff_unmerge(&revs->diffopt, idx->name);
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if (tree)
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fill_filespec(pair->one, &tree->oid, 1,
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tree->ce_mode);
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return;
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}
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/*
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* Something added to the tree?
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*/
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if (!tree) {
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show_new_file(revs, idx, cached, match_missing);
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return;
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}
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/*
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* Something removed from the tree?
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*/
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if (!idx) {
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if (S_ISSPARSEDIR(tree->ce_mode)) {
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diff_tree_oid(&tree->oid, NULL, tree->name, &revs->diffopt);
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return;
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}
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diff_index_show_file(revs, "-", tree, &tree->oid, 1,
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tree->ce_mode, 0);
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return;
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}
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/* Show difference between old and new */
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show_modified(revs, tree, idx, 1, cached, match_missing);
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}
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/*
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* The unpack_trees() interface is designed for merging, so
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* the different source entries are designed primarily for
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* the source trees, with the old index being really mainly
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* used for being replaced by the result.
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*
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* For diffing, the index is more important, and we only have a
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* single tree.
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*
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* We're supposed to advance o->pos to skip what we have already processed.
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*
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* This wrapper makes it all more readable, and takes care of all
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* the fairly complex unpack_trees() semantic requirements, including
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|
* 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(revs->diffopt.repo->index,
|
|
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 struct object_id *tree_oid,
|
|
const char *tree_name,
|
|
int cached)
|
|
{
|
|
struct tree *tree;
|
|
struct tree_desc t;
|
|
struct unpack_trees_options opts;
|
|
|
|
tree = parse_tree_indirect(tree_oid);
|
|
if (!tree)
|
|
return error("bad tree object %s",
|
|
tree_name ? tree_name : oid_to_hex(tree_oid));
|
|
memset(&opts, 0, sizeof(opts));
|
|
opts.head_idx = 1;
|
|
opts.index_only = cached;
|
|
opts.diff_index_cached = (cached &&
|
|
!revs->diffopt.flags.find_copies_harder);
|
|
opts.merge = 1;
|
|
opts.fn = oneway_diff;
|
|
opts.unpack_data = revs;
|
|
opts.src_index = revs->diffopt.repo->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);
|
|
}
|
|
|
|
void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb)
|
|
{
|
|
int i;
|
|
struct commit *mb_child[2] = {0};
|
|
struct commit_list *merge_bases;
|
|
|
|
for (i = 0; i < revs->pending.nr; i++) {
|
|
struct object *obj = revs->pending.objects[i].item;
|
|
if (obj->flags)
|
|
die(_("--merge-base does not work with ranges"));
|
|
if (obj->type != OBJ_COMMIT)
|
|
die(_("--merge-base only works with commits"));
|
|
}
|
|
|
|
/*
|
|
* This check must go after the for loop above because A...B
|
|
* ranges produce three pending commits, resulting in a
|
|
* misleading error message.
|
|
*/
|
|
if (revs->pending.nr < 1 || revs->pending.nr > 2)
|
|
BUG("unexpected revs->pending.nr: %d", revs->pending.nr);
|
|
|
|
for (i = 0; i < revs->pending.nr; i++)
|
|
mb_child[i] = lookup_commit_reference(the_repository, &revs->pending.objects[i].item->oid);
|
|
if (revs->pending.nr == 1) {
|
|
struct object_id oid;
|
|
|
|
if (get_oid("HEAD", &oid))
|
|
die(_("unable to get HEAD"));
|
|
|
|
mb_child[1] = lookup_commit_reference(the_repository, &oid);
|
|
}
|
|
|
|
merge_bases = repo_get_merge_bases(the_repository, mb_child[0], mb_child[1]);
|
|
if (!merge_bases)
|
|
die(_("no merge base found"));
|
|
if (merge_bases->next)
|
|
die(_("multiple merge bases found"));
|
|
|
|
oidcpy(mb, &merge_bases->item->object.oid);
|
|
|
|
free_commit_list(merge_bases);
|
|
}
|
|
|
|
int run_diff_index(struct rev_info *revs, unsigned int option)
|
|
{
|
|
struct object_array_entry *ent;
|
|
int cached = !!(option & DIFF_INDEX_CACHED);
|
|
int merge_base = !!(option & DIFF_INDEX_MERGE_BASE);
|
|
struct object_id oid;
|
|
const char *name;
|
|
char merge_base_hex[GIT_MAX_HEXSZ + 1];
|
|
struct index_state *istate = revs->diffopt.repo->index;
|
|
|
|
if (revs->pending.nr != 1)
|
|
BUG("run_diff_index must be passed exactly one tree");
|
|
|
|
trace_performance_enter();
|
|
ent = revs->pending.objects;
|
|
|
|
refresh_fsmonitor(istate);
|
|
|
|
if (merge_base) {
|
|
diff_get_merge_base(revs, &oid);
|
|
name = oid_to_hex_r(merge_base_hex, &oid);
|
|
} else {
|
|
oidcpy(&oid, &ent->item->oid);
|
|
name = ent->name;
|
|
}
|
|
|
|
if (diff_cache(revs, &oid, name, cached))
|
|
exit(128);
|
|
|
|
diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/");
|
|
diffcore_fix_diff_index();
|
|
diffcore_std(&revs->diffopt);
|
|
diff_flush(&revs->diffopt);
|
|
trace_performance_leave("diff-index");
|
|
return 0;
|
|
}
|
|
|
|
int do_diff_cache(const struct object_id *tree_oid, struct diff_options *opt)
|
|
{
|
|
struct rev_info revs;
|
|
|
|
repo_init_revisions(opt->repo, &revs, NULL);
|
|
copy_pathspec(&revs.prune_data, &opt->pathspec);
|
|
diff_setup_done(&revs.diffopt);
|
|
revs.diffopt = *opt;
|
|
|
|
if (diff_cache(&revs, tree_oid, NULL, 1))
|
|
exit(128);
|
|
release_revisions(&revs);
|
|
return 0;
|
|
}
|
|
|
|
int index_differs_from(struct repository *r,
|
|
const char *def, const struct diff_flags *flags,
|
|
int ita_invisible_in_index)
|
|
{
|
|
struct rev_info rev;
|
|
struct setup_revision_opt opt;
|
|
unsigned has_changes;
|
|
|
|
repo_init_revisions(r, &rev, NULL);
|
|
memset(&opt, 0, sizeof(opt));
|
|
opt.def = def;
|
|
setup_revisions(0, NULL, &rev, &opt);
|
|
rev.diffopt.flags.quick = 1;
|
|
rev.diffopt.flags.exit_with_status = 1;
|
|
if (flags)
|
|
diff_flags_or(&rev.diffopt.flags, flags);
|
|
rev.diffopt.ita_invisible_in_index = ita_invisible_in_index;
|
|
run_diff_index(&rev, 1);
|
|
has_changes = rev.diffopt.flags.has_changes;
|
|
release_revisions(&rev);
|
|
return (has_changes != 0);
|
|
}
|
|
|
|
static struct strbuf *idiff_prefix_cb(struct diff_options *opt UNUSED, void *data)
|
|
{
|
|
return data;
|
|
}
|
|
|
|
void show_interdiff(const struct object_id *oid1, const struct object_id *oid2,
|
|
int indent, struct diff_options *diffopt)
|
|
{
|
|
struct diff_options opts;
|
|
struct strbuf prefix = STRBUF_INIT;
|
|
|
|
memcpy(&opts, diffopt, sizeof(opts));
|
|
opts.output_format = DIFF_FORMAT_PATCH;
|
|
opts.output_prefix = idiff_prefix_cb;
|
|
strbuf_addchars(&prefix, ' ', indent);
|
|
opts.output_prefix_data = &prefix;
|
|
diff_setup_done(&opts);
|
|
|
|
diff_tree_oid(oid1, oid2, "", &opts);
|
|
diffcore_std(&opts);
|
|
diff_flush(&opts);
|
|
|
|
strbuf_release(&prefix);
|
|
}
|