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![Jeff King](/assets/img/avatar_default.png)
Our rename detection is a heuristic, matching pairs of removed and added files with similar or identical content. It's unlikely to be wrong when there is actual content to compare, and we already take care not to do inexact rename detection when there is not enough content to produce good results. However, we always do exact rename detection, even when the blob is tiny or empty. It's easy to get false positives with an empty blob, simply because it is an obvious content to use as a boilerplate (e.g., when telling git that an empty directory is worth tracking via an empty .gitignore). This patch lets callers specify whether or not they are interested in using empty files as rename sources and destinations. The default is "yes", keeping the original behavior. It works by detecting the empty-blob sha1 for rename sources and destinations. One more flexible alternative would be to allow the caller to specify a minimum size for a blob to be "interesting" for rename detection. But that would catch small boilerplate files, not large ones (e.g., if you had the GPL COPYING file in many directories). A better alternative would be to allow a "-rename" gitattribute to allow boilerplate files to be marked as such. I'll leave the complexity of that solution until such time as somebody actually wants it. The complaints we've seen so far revolve around empty files, so let's start with the simple thing. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
725 lines
18 KiB
C
725 lines
18 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 "diff.h"
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#include "diffcore.h"
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#include "hash.h"
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#include "progress.h"
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/* Table of rename/copy destinations */
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static struct diff_rename_dst {
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struct diff_filespec *two;
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struct diff_filepair *pair;
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} *rename_dst;
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static int rename_dst_nr, rename_dst_alloc;
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static struct diff_rename_dst *locate_rename_dst(struct diff_filespec *two,
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int insert_ok)
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{
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int first, last;
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first = 0;
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last = rename_dst_nr;
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while (last > first) {
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int next = (last + first) >> 1;
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struct diff_rename_dst *dst = &(rename_dst[next]);
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int cmp = strcmp(two->path, dst->two->path);
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if (!cmp)
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return dst;
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if (cmp < 0) {
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last = next;
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continue;
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}
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first = next+1;
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}
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/* not found */
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if (!insert_ok)
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return NULL;
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/* insert to make it at "first" */
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if (rename_dst_alloc <= rename_dst_nr) {
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rename_dst_alloc = alloc_nr(rename_dst_alloc);
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rename_dst = xrealloc(rename_dst,
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rename_dst_alloc * sizeof(*rename_dst));
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}
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rename_dst_nr++;
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if (first < rename_dst_nr)
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memmove(rename_dst + first + 1, rename_dst + first,
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(rename_dst_nr - first - 1) * sizeof(*rename_dst));
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rename_dst[first].two = alloc_filespec(two->path);
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fill_filespec(rename_dst[first].two, two->sha1, two->mode);
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rename_dst[first].pair = NULL;
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return &(rename_dst[first]);
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}
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/* Table of rename/copy src files */
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static struct diff_rename_src {
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struct diff_filepair *p;
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unsigned short score; /* to remember the break score */
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} *rename_src;
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static int rename_src_nr, rename_src_alloc;
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static struct diff_rename_src *register_rename_src(struct diff_filepair *p)
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{
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int first, last;
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struct diff_filespec *one = p->one;
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unsigned short score = p->score;
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first = 0;
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last = rename_src_nr;
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while (last > first) {
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int next = (last + first) >> 1;
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struct diff_rename_src *src = &(rename_src[next]);
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int cmp = strcmp(one->path, src->p->one->path);
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if (!cmp)
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return src;
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if (cmp < 0) {
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last = next;
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continue;
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}
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first = next+1;
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}
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/* insert to make it at "first" */
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if (rename_src_alloc <= rename_src_nr) {
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rename_src_alloc = alloc_nr(rename_src_alloc);
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rename_src = xrealloc(rename_src,
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rename_src_alloc * sizeof(*rename_src));
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}
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rename_src_nr++;
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if (first < rename_src_nr)
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memmove(rename_src + first + 1, rename_src + first,
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(rename_src_nr - first - 1) * sizeof(*rename_src));
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rename_src[first].p = p;
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rename_src[first].score = score;
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return &(rename_src[first]);
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}
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static int basename_same(struct diff_filespec *src, struct diff_filespec *dst)
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{
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int src_len = strlen(src->path), dst_len = strlen(dst->path);
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while (src_len && dst_len) {
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char c1 = src->path[--src_len];
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char c2 = dst->path[--dst_len];
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if (c1 != c2)
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return 0;
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if (c1 == '/')
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return 1;
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}
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return (!src_len || src->path[src_len - 1] == '/') &&
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(!dst_len || dst->path[dst_len - 1] == '/');
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}
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struct diff_score {
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int src; /* index in rename_src */
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int dst; /* index in rename_dst */
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unsigned short score;
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short name_score;
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};
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static int estimate_similarity(struct diff_filespec *src,
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struct diff_filespec *dst,
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int minimum_score)
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{
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/* src points at a file that existed in the original tree (or
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* optionally a file in the destination tree) and dst points
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* at a newly created file. They may be quite similar, in which
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* case we want to say src is renamed to dst or src is copied into
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* dst, and then some edit has been applied to dst.
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*
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* Compare them and return how similar they are, representing
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* the score as an integer between 0 and MAX_SCORE.
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*
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* When there is an exact match, it is considered a better
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* match than anything else; the destination does not even
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* call into this function in that case.
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*/
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unsigned long max_size, delta_size, base_size, src_copied, literal_added;
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unsigned long delta_limit;
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int score;
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/* We deal only with regular files. Symlink renames are handled
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* only when they are exact matches --- in other words, no edits
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* after renaming.
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*/
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if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
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return 0;
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/*
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* Need to check that source and destination sizes are
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* filled in before comparing them.
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*
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* If we already have "cnt_data" filled in, we know it's
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* all good (avoid checking the size for zero, as that
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* is a possible size - we really should have a flag to
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* say whether the size is valid or not!)
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*/
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if (!src->cnt_data && diff_populate_filespec(src, 1))
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return 0;
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if (!dst->cnt_data && diff_populate_filespec(dst, 1))
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return 0;
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max_size = ((src->size > dst->size) ? src->size : dst->size);
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base_size = ((src->size < dst->size) ? src->size : dst->size);
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delta_size = max_size - base_size;
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/* We would not consider edits that change the file size so
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* drastically. delta_size must be smaller than
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* (MAX_SCORE-minimum_score)/MAX_SCORE * min(src->size, dst->size).
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*
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* Note that base_size == 0 case is handled here already
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* and the final score computation below would not have a
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* divide-by-zero issue.
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*/
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if (max_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
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return 0;
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if (!src->cnt_data && diff_populate_filespec(src, 0))
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return 0;
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if (!dst->cnt_data && diff_populate_filespec(dst, 0))
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return 0;
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delta_limit = (unsigned long)
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(base_size * (MAX_SCORE-minimum_score) / MAX_SCORE);
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if (diffcore_count_changes(src, dst,
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&src->cnt_data, &dst->cnt_data,
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delta_limit,
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&src_copied, &literal_added))
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return 0;
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/* How similar are they?
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* what percentage of material in dst are from source?
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*/
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if (!dst->size)
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score = 0; /* should not happen */
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else
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score = (int)(src_copied * MAX_SCORE / max_size);
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return score;
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}
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static void record_rename_pair(int dst_index, int src_index, int score)
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{
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struct diff_filespec *src, *dst;
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struct diff_filepair *dp;
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if (rename_dst[dst_index].pair)
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die("internal error: dst already matched.");
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src = rename_src[src_index].p->one;
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src->rename_used++;
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src->count++;
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dst = rename_dst[dst_index].two;
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dst->count++;
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dp = diff_queue(NULL, src, dst);
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dp->renamed_pair = 1;
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if (!strcmp(src->path, dst->path))
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dp->score = rename_src[src_index].score;
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else
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dp->score = score;
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rename_dst[dst_index].pair = dp;
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}
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/*
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* We sort the rename similarity matrix with the score, in descending
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* order (the most similar first).
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*/
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static int score_compare(const void *a_, const void *b_)
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{
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const struct diff_score *a = a_, *b = b_;
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/* sink the unused ones to the bottom */
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if (a->dst < 0)
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return (0 <= b->dst);
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else if (b->dst < 0)
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return -1;
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if (a->score == b->score)
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return b->name_score - a->name_score;
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return b->score - a->score;
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}
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struct file_similarity {
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int src_dst, index;
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struct diff_filespec *filespec;
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struct file_similarity *next;
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};
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static int find_identical_files(struct file_similarity *src,
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struct file_similarity *dst,
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struct diff_options *options)
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{
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int renames = 0;
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/*
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* Walk over all the destinations ...
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*/
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do {
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struct diff_filespec *target = dst->filespec;
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struct file_similarity *p, *best;
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int i = 100, best_score = -1;
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/*
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* .. to find the best source match
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*/
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best = NULL;
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for (p = src; p; p = p->next) {
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int score;
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struct diff_filespec *source = p->filespec;
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/* False hash collision? */
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if (hashcmp(source->sha1, target->sha1))
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continue;
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/* Non-regular files? If so, the modes must match! */
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if (!S_ISREG(source->mode) || !S_ISREG(target->mode)) {
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if (source->mode != target->mode)
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continue;
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}
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/* Give higher scores to sources that haven't been used already */
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score = !source->rename_used;
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if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY)
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continue;
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score += basename_same(source, target);
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if (score > best_score) {
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best = p;
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best_score = score;
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if (score == 2)
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break;
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}
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/* Too many identical alternatives? Pick one */
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if (!--i)
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break;
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}
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if (best) {
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record_rename_pair(dst->index, best->index, MAX_SCORE);
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renames++;
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}
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} while ((dst = dst->next) != NULL);
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return renames;
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}
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static void free_similarity_list(struct file_similarity *p)
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{
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while (p) {
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struct file_similarity *entry = p;
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p = p->next;
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free(entry);
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}
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}
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static int find_same_files(void *ptr, void *data)
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{
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int ret;
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struct file_similarity *p = ptr;
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struct file_similarity *src = NULL, *dst = NULL;
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struct diff_options *options = data;
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/* Split the hash list up into sources and destinations */
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do {
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struct file_similarity *entry = p;
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p = p->next;
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if (entry->src_dst < 0) {
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entry->next = src;
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src = entry;
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} else {
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entry->next = dst;
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dst = entry;
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}
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} while (p);
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/*
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* If we have both sources *and* destinations, see if
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* we can match them up
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*/
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ret = (src && dst) ? find_identical_files(src, dst, options) : 0;
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/* Free the hashes and return the number of renames found */
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free_similarity_list(src);
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free_similarity_list(dst);
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return ret;
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}
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static unsigned int hash_filespec(struct diff_filespec *filespec)
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{
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unsigned int hash;
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if (!filespec->sha1_valid) {
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if (diff_populate_filespec(filespec, 0))
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return 0;
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hash_sha1_file(filespec->data, filespec->size, "blob", filespec->sha1);
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}
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memcpy(&hash, filespec->sha1, sizeof(hash));
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return hash;
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}
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static void insert_file_table(struct hash_table *table, int src_dst, int index, struct diff_filespec *filespec)
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{
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void **pos;
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unsigned int hash;
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struct file_similarity *entry = xmalloc(sizeof(*entry));
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entry->src_dst = src_dst;
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entry->index = index;
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entry->filespec = filespec;
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entry->next = NULL;
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hash = hash_filespec(filespec);
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pos = insert_hash(hash, entry, table);
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/* We already had an entry there? */
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if (pos) {
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entry->next = *pos;
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*pos = entry;
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}
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}
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/*
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* Find exact renames first.
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*
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* The first round matches up the up-to-date entries,
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* and then during the second round we try to match
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* cache-dirty entries as well.
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*/
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static int find_exact_renames(struct diff_options *options)
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{
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int i;
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struct hash_table file_table;
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init_hash(&file_table);
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for (i = 0; i < rename_src_nr; i++)
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insert_file_table(&file_table, -1, i, rename_src[i].p->one);
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for (i = 0; i < rename_dst_nr; i++)
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insert_file_table(&file_table, 1, i, rename_dst[i].two);
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/* Find the renames */
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i = for_each_hash(&file_table, find_same_files, options);
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/* .. and free the hash data structure */
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free_hash(&file_table);
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return i;
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}
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#define NUM_CANDIDATE_PER_DST 4
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static void record_if_better(struct diff_score m[], struct diff_score *o)
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{
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int i, worst;
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/* find the worst one */
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worst = 0;
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for (i = 1; i < NUM_CANDIDATE_PER_DST; i++)
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if (score_compare(&m[i], &m[worst]) > 0)
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worst = i;
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/* is it better than the worst one? */
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if (score_compare(&m[worst], o) > 0)
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m[worst] = *o;
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}
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/*
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* Returns:
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* 0 if we are under the limit;
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* 1 if we need to disable inexact rename detection;
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* 2 if we would be under the limit if we were given -C instead of -C -C.
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*/
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static int too_many_rename_candidates(int num_create,
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struct diff_options *options)
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{
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int rename_limit = options->rename_limit;
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int num_src = rename_src_nr;
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int i;
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options->needed_rename_limit = 0;
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/*
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* This basically does a test for the rename matrix not
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* growing larger than a "rename_limit" square matrix, ie:
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*
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* num_create * num_src > rename_limit * rename_limit
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*
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* but handles the potential overflow case specially (and we
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* assume at least 32-bit integers)
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*/
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if (rename_limit <= 0 || rename_limit > 32767)
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rename_limit = 32767;
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if ((num_create <= rename_limit || num_src <= rename_limit) &&
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(num_create * num_src <= rename_limit * rename_limit))
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return 0;
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options->needed_rename_limit =
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num_src > num_create ? num_src : num_create;
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/* Are we running under -C -C? */
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if (!DIFF_OPT_TST(options, FIND_COPIES_HARDER))
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return 1;
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/* Would we bust the limit if we were running under -C? */
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for (num_src = i = 0; i < rename_src_nr; i++) {
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if (diff_unmodified_pair(rename_src[i].p))
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continue;
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num_src++;
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}
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if ((num_create <= rename_limit || num_src <= rename_limit) &&
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(num_create * num_src <= rename_limit * rename_limit))
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return 2;
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return 1;
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}
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static int find_renames(struct diff_score *mx, int dst_cnt, int minimum_score, int copies)
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{
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int count = 0, i;
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for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) {
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struct diff_rename_dst *dst;
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if ((mx[i].dst < 0) ||
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(mx[i].score < minimum_score))
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break; /* there is no more usable pair. */
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dst = &rename_dst[mx[i].dst];
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if (dst->pair)
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continue; /* already done, either exact or fuzzy. */
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if (!copies && rename_src[mx[i].src].p->one->rename_used)
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continue;
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record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
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count++;
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}
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return count;
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}
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void diffcore_rename(struct diff_options *options)
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{
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int detect_rename = options->detect_rename;
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int minimum_score = options->rename_score;
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struct diff_queue_struct *q = &diff_queued_diff;
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struct diff_queue_struct outq;
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struct diff_score *mx;
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int i, j, rename_count, skip_unmodified = 0;
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int num_create, dst_cnt;
|
|
struct progress *progress = NULL;
|
|
|
|
if (!minimum_score)
|
|
minimum_score = DEFAULT_RENAME_SCORE;
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
if (!DIFF_FILE_VALID(p->one)) {
|
|
if (!DIFF_FILE_VALID(p->two))
|
|
continue; /* unmerged */
|
|
else if (options->single_follow &&
|
|
strcmp(options->single_follow, p->two->path))
|
|
continue; /* not interested */
|
|
else if (!DIFF_OPT_TST(options, RENAME_EMPTY) &&
|
|
is_empty_blob_sha1(p->two->sha1))
|
|
continue;
|
|
else
|
|
locate_rename_dst(p->two, 1);
|
|
}
|
|
else if (!DIFF_OPT_TST(options, RENAME_EMPTY) &&
|
|
is_empty_blob_sha1(p->one->sha1))
|
|
continue;
|
|
else if (!DIFF_PAIR_UNMERGED(p) && !DIFF_FILE_VALID(p->two)) {
|
|
/*
|
|
* If the source is a broken "delete", and
|
|
* they did not really want to get broken,
|
|
* that means the source actually stays.
|
|
* So we increment the "rename_used" score
|
|
* by one, to indicate ourselves as a user
|
|
*/
|
|
if (p->broken_pair && !p->score)
|
|
p->one->rename_used++;
|
|
register_rename_src(p);
|
|
}
|
|
else if (detect_rename == DIFF_DETECT_COPY) {
|
|
/*
|
|
* Increment the "rename_used" score by
|
|
* one, to indicate ourselves as a user.
|
|
*/
|
|
p->one->rename_used++;
|
|
register_rename_src(p);
|
|
}
|
|
}
|
|
if (rename_dst_nr == 0 || rename_src_nr == 0)
|
|
goto cleanup; /* nothing to do */
|
|
|
|
/*
|
|
* We really want to cull the candidates list early
|
|
* with cheap tests in order to avoid doing deltas.
|
|
*/
|
|
rename_count = find_exact_renames(options);
|
|
|
|
/* Did we only want exact renames? */
|
|
if (minimum_score == MAX_SCORE)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* Calculate how many renames are left (but all the source
|
|
* files still remain as options for rename/copies!)
|
|
*/
|
|
num_create = (rename_dst_nr - rename_count);
|
|
|
|
/* All done? */
|
|
if (!num_create)
|
|
goto cleanup;
|
|
|
|
switch (too_many_rename_candidates(num_create, options)) {
|
|
case 1:
|
|
goto cleanup;
|
|
case 2:
|
|
options->degraded_cc_to_c = 1;
|
|
skip_unmodified = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (options->show_rename_progress) {
|
|
progress = start_progress_delay(
|
|
"Performing inexact rename detection",
|
|
rename_dst_nr * rename_src_nr, 50, 1);
|
|
}
|
|
|
|
mx = xcalloc(num_create * NUM_CANDIDATE_PER_DST, sizeof(*mx));
|
|
for (dst_cnt = i = 0; i < rename_dst_nr; i++) {
|
|
struct diff_filespec *two = rename_dst[i].two;
|
|
struct diff_score *m;
|
|
|
|
if (rename_dst[i].pair)
|
|
continue; /* dealt with exact match already. */
|
|
|
|
m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST];
|
|
for (j = 0; j < NUM_CANDIDATE_PER_DST; j++)
|
|
m[j].dst = -1;
|
|
|
|
for (j = 0; j < rename_src_nr; j++) {
|
|
struct diff_filespec *one = rename_src[j].p->one;
|
|
struct diff_score this_src;
|
|
|
|
if (skip_unmodified &&
|
|
diff_unmodified_pair(rename_src[j].p))
|
|
continue;
|
|
|
|
this_src.score = estimate_similarity(one, two,
|
|
minimum_score);
|
|
this_src.name_score = basename_same(one, two);
|
|
this_src.dst = i;
|
|
this_src.src = j;
|
|
record_if_better(m, &this_src);
|
|
/*
|
|
* Once we run estimate_similarity,
|
|
* We do not need the text anymore.
|
|
*/
|
|
diff_free_filespec_blob(one);
|
|
diff_free_filespec_blob(two);
|
|
}
|
|
dst_cnt++;
|
|
display_progress(progress, (i+1)*rename_src_nr);
|
|
}
|
|
stop_progress(&progress);
|
|
|
|
/* cost matrix sorted by most to least similar pair */
|
|
qsort(mx, dst_cnt * NUM_CANDIDATE_PER_DST, sizeof(*mx), score_compare);
|
|
|
|
rename_count += find_renames(mx, dst_cnt, minimum_score, 0);
|
|
if (detect_rename == DIFF_DETECT_COPY)
|
|
rename_count += find_renames(mx, dst_cnt, minimum_score, 1);
|
|
free(mx);
|
|
|
|
cleanup:
|
|
/* At this point, we have found some renames and copies and they
|
|
* are recorded in rename_dst. The original list is still in *q.
|
|
*/
|
|
DIFF_QUEUE_CLEAR(&outq);
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
struct diff_filepair *pair_to_free = NULL;
|
|
|
|
if (DIFF_PAIR_UNMERGED(p)) {
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
|
|
/*
|
|
* Creation
|
|
*
|
|
* We would output this create record if it has
|
|
* not been turned into a rename/copy already.
|
|
*/
|
|
struct diff_rename_dst *dst =
|
|
locate_rename_dst(p->two, 0);
|
|
if (dst && dst->pair) {
|
|
diff_q(&outq, dst->pair);
|
|
pair_to_free = p;
|
|
}
|
|
else
|
|
/* no matching rename/copy source, so
|
|
* record this as a creation.
|
|
*/
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) {
|
|
/*
|
|
* Deletion
|
|
*
|
|
* We would output this delete record if:
|
|
*
|
|
* (1) this is a broken delete and the counterpart
|
|
* broken create remains in the output; or
|
|
* (2) this is not a broken delete, and rename_dst
|
|
* does not have a rename/copy to move p->one->path
|
|
* out of existence.
|
|
*
|
|
* Otherwise, the counterpart broken create
|
|
* has been turned into a rename-edit; or
|
|
* delete did not have a matching create to
|
|
* begin with.
|
|
*/
|
|
if (DIFF_PAIR_BROKEN(p)) {
|
|
/* broken delete */
|
|
struct diff_rename_dst *dst =
|
|
locate_rename_dst(p->one, 0);
|
|
if (dst && dst->pair)
|
|
/* counterpart is now rename/copy */
|
|
pair_to_free = p;
|
|
}
|
|
else {
|
|
if (p->one->rename_used)
|
|
/* this path remains */
|
|
pair_to_free = p;
|
|
}
|
|
|
|
if (pair_to_free)
|
|
;
|
|
else
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (!diff_unmodified_pair(p))
|
|
/* all the usual ones need to be kept */
|
|
diff_q(&outq, p);
|
|
else
|
|
/* no need to keep unmodified pairs */
|
|
pair_to_free = p;
|
|
|
|
if (pair_to_free)
|
|
diff_free_filepair(pair_to_free);
|
|
}
|
|
diff_debug_queue("done copying original", &outq);
|
|
|
|
free(q->queue);
|
|
*q = outq;
|
|
diff_debug_queue("done collapsing", q);
|
|
|
|
for (i = 0; i < rename_dst_nr; i++)
|
|
free_filespec(rename_dst[i].two);
|
|
|
|
free(rename_dst);
|
|
rename_dst = NULL;
|
|
rename_dst_nr = rename_dst_alloc = 0;
|
|
free(rename_src);
|
|
rename_src = NULL;
|
|
rename_src_nr = rename_src_alloc = 0;
|
|
return;
|
|
}
|