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https://github.com/git/git.git
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cb2b9f5ee1
This implements a 3-way diff between the HEAD commit, the state in the index, and the working directory. This is like the n-way diff for a merge, and uses much of the same code. It is invoked with the -c flag to git-diff-index, which it already accepted and did nothing with. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
372 lines
8.7 KiB
C
372 lines
8.7 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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/*
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* diff-files
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*/
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int run_diff_files(struct rev_info *revs, int silent_on_removed)
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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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if (diff_unmerged_stage < 0)
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diff_unmerged_stage = 2;
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entries = read_cache();
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if (entries < 0) {
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perror("read_cache");
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return -1;
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}
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for (i = 0; i < entries; i++) {
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struct stat st;
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unsigned int oldmode, newmode;
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struct cache_entry *ce = active_cache[i];
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int changed;
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if (!ce_path_match(ce, revs->prune_data))
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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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int num_compare_stages = 0;
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size_t path_len;
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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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dpath->len = path_len;
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memcpy(dpath->path, ce->name, path_len);
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dpath->path[path_len] = '\0';
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dpath->mode = 0;
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hashclr(dpath->sha1);
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memset(&(dpath->parent[0]), 0,
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sizeof(struct combine_diff_parent)*5);
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while (i < entries) {
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struct cache_entry *nce = active_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 = ntohl(nce->ce_mode);
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num_compare_stages++;
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hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
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dpath->parent[stage-2].mode =
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canon_mode(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,
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revs->dense_combined_merges,
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revs);
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free(dpath);
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continue;
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}
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free(dpath);
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dpath = NULL;
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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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diff_unmerge(&revs->diffopt, ce->name);
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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 (lstat(ce->name, &st) < 0) {
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if (errno != ENOENT && errno != ENOTDIR) {
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perror(ce->name);
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continue;
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}
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if (silent_on_removed)
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continue;
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diff_addremove(&revs->diffopt, '-', ntohl(ce->ce_mode),
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ce->sha1, ce->name, NULL);
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continue;
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}
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changed = ce_match_stat(ce, &st, 0);
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if (!changed && !revs->diffopt.find_copies_harder)
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continue;
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oldmode = ntohl(ce->ce_mode);
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newmode = canon_mode(st.st_mode);
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if (!trust_executable_bit &&
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S_ISREG(newmode) && S_ISREG(oldmode) &&
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((newmode ^ oldmode) == 0111))
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newmode = oldmode;
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diff_change(&revs->diffopt, oldmode, newmode,
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ce->sha1, (changed ? null_sha1 : ce->sha1),
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ce->name, NULL);
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}
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diffcore_std(&revs->diffopt);
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diff_flush(&revs->diffopt);
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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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struct cache_entry *ce,
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unsigned char *sha1, unsigned int mode)
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{
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diff_addremove(&revs->diffopt, prefix[0], ntohl(mode),
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sha1, ce->name, NULL);
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}
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static int get_stat_data(struct cache_entry *ce,
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unsigned char **sha1p,
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unsigned int *modep,
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int cached, int match_missing)
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{
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unsigned char *sha1 = ce->sha1;
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unsigned int mode = ce->ce_mode;
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if (!cached) {
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static unsigned char no_sha1[20];
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int changed;
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struct stat st;
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if (lstat(ce->name, &st) < 0) {
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if (errno == ENOENT && match_missing) {
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*sha1p = sha1;
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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 = ce_match_stat(ce, &st, 0);
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if (changed) {
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mode = create_ce_mode(st.st_mode);
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if (!trust_executable_bit && S_ISREG(st.st_mode))
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mode = ce->ce_mode;
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sha1 = no_sha1;
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}
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}
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*sha1p = sha1;
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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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struct cache_entry *new,
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int cached, int match_missing)
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{
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unsigned char *sha1;
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unsigned int mode;
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/* New file in the index: it might actually be different in
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* the working copy.
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*/
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if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0)
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return;
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diff_index_show_file(revs, "+", new, sha1, mode);
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}
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static int show_modified(struct rev_info *revs,
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struct cache_entry *old,
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struct cache_entry *new,
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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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unsigned char *sha1;
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if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
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if (report_missing)
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diff_index_show_file(revs, "-", old,
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old->sha1, old->ce_mode);
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return -1;
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}
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if (revs->combine_merges && !cached &&
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(hashcmp(sha1, old->sha1) || hashcmp(old->sha1, new->sha1))) {
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struct combine_diff_path *p;
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int pathlen = ce_namelen(new);
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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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p->len = pathlen;
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memcpy(p->path, new->name, pathlen);
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p->path[pathlen] = 0;
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p->mode = ntohl(mode);
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hashclr(p->sha1);
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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 = ntohl(new->ce_mode);
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hashcpy(p->parent[0].sha1, new->sha1);
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p->parent[1].status = DIFF_STATUS_MODIFIED;
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p->parent[1].mode = ntohl(old->ce_mode);
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hashcpy(p->parent[1].sha1, old->sha1);
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show_combined_diff(p, 2, revs->dense_combined_merges, revs);
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free(p);
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return 0;
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}
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oldmode = old->ce_mode;
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if (mode == oldmode && !hashcmp(sha1, old->sha1) &&
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!revs->diffopt.find_copies_harder)
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return 0;
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mode = ntohl(mode);
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oldmode = ntohl(oldmode);
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diff_change(&revs->diffopt, oldmode, mode,
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old->sha1, sha1, old->name, NULL);
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return 0;
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}
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static int diff_cache(struct rev_info *revs,
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struct cache_entry **ac, int entries,
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const char **pathspec,
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int cached, int match_missing)
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{
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while (entries) {
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struct cache_entry *ce = *ac;
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int same = (entries > 1) && ce_same_name(ce, ac[1]);
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if (!ce_path_match(ce, pathspec))
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goto skip_entry;
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switch (ce_stage(ce)) {
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case 0:
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/* No stage 1 entry? That means it's a new file */
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if (!same) {
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show_new_file(revs, ce, cached, match_missing);
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break;
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}
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/* Show difference between old and new */
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show_modified(revs,ac[1], ce, 1,
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cached, match_missing);
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break;
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case 1:
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/* No stage 3 (merge) entry?
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* That means it's been deleted.
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*/
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if (!same) {
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diff_index_show_file(revs, "-", ce,
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ce->sha1, ce->ce_mode);
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break;
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}
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/* We come here with ce pointing at stage 1
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* (original tree) and ac[1] pointing at stage
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* 3 (unmerged). show-modified with
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* report-missing set to false does not say the
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* file is deleted but reports true if work
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* tree does not have it, in which case we
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* fall through to report the unmerged state.
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* Otherwise, we show the differences between
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* the original tree and the work tree.
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*/
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if (!cached &&
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!show_modified(revs, ce, ac[1], 0,
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cached, match_missing))
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break;
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/* fallthru */
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case 3:
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diff_unmerge(&revs->diffopt, ce->name);
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break;
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default:
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die("impossible cache entry stage");
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}
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skip_entry:
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/*
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* Ignore all the different stages for this file,
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* we've handled the relevant cases now.
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*/
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do {
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ac++;
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entries--;
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} while (entries && ce_same_name(ce, ac[0]));
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}
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return 0;
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}
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/*
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* This turns all merge entries into "stage 3". That guarantees that
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* when we read in the new tree (into "stage 1"), we won't lose sight
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* of the fact that we had unmerged entries.
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*/
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static void mark_merge_entries(void)
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{
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int i;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (!ce_stage(ce))
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continue;
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ce->ce_flags |= htons(CE_STAGEMASK);
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}
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}
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int run_diff_index(struct rev_info *revs, int cached)
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{
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int ret;
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struct object *ent;
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struct tree *tree;
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const char *tree_name;
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int match_missing = 0;
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/*
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* Backward compatibility wart - "diff-index -m" does
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* not mean "do not ignore merges", but totally different.
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*/
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if (!revs->ignore_merges)
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match_missing = 1;
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if (read_cache() < 0) {
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perror("read_cache");
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return -1;
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}
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mark_merge_entries();
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ent = revs->pending.objects[0].item;
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tree_name = revs->pending.objects[0].name;
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tree = parse_tree_indirect(ent->sha1);
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if (!tree)
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return error("bad tree object %s", tree_name);
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if (read_tree(tree, 1, revs->prune_data))
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return error("unable to read tree object %s", tree_name);
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ret = diff_cache(revs, active_cache, active_nr, revs->prune_data,
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cached, match_missing);
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diffcore_std(&revs->diffopt);
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diff_flush(&revs->diffopt);
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return ret;
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}
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