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![Linus Torvalds](/assets/img/avatar_default.png)
Kumar Gala had a case in the u-boot archive with multiple renames of files with identical contents, and git would turn those into multiple "copy" operations of one of the sources, and just deleting the other sources. This patch makes the git exact rename detection prefer to spread out the renames over the multiple sources, rather than do multiple copies of one source. NOTE! The changes are a bit larger than required, because I also renamed the variables named "one" and "two" to "target" and "source" respectively. That makes the logic easier to follow, especially as the "one" was illogically the target and not the soruce, for purely historical reasons (this piece of code used to traverse over sources and targets in the wrong order, and when we fixed that, we didn't fix the names back then. So I fixed them now). The important part of this change is just the trivial score calculations for when files have identical contents: /* Give higher scores to sources that haven't been used already */ score = !source->rename_used; score += basename_same(source, target); and when we have multiple choices we'll now pick the choice that gets the best rename score, rather than only looking at whether the basename matched. It's worth noting a few gotchas: - this scoring is currently only done for the "exact match" case. In particular, in Kumar's example, even after this patch, the inexact match case is still done as a copy+delete rather than as two renames: delete mode 100644 board/cds/mpc8555cds/u-boot.lds copy board/{cds => freescale}/mpc8541cds/u-boot.lds (97%) rename board/{cds/mpc8541cds => freescale/mpc8555cds}/u-boot.lds (97%) because apparently the "cds/mpc8541cds/u-boot.lds" copy looked a bit more similar to both end results. That said, I *suspect* we just have the exact same issue there - the similarity analysis just gave identical (or at least very _close_ to identical) similarity points, and we do not have any logic to prefer multiple renames over a copy/delete there. That is a separate patch. - When you have identical contents and identical basenames, the actual entry that is chosen is still picked fairly "at random" for the first one (but the subsequent ones will prefer entries that haven't already been used). It's not actually really random, in that it actually depends on the relative alphabetical order of the files (which in turn will have impacted the order that the entries got hashed!), so it gives consistent results that can be explained. But I wanted to point it out as an issue for when anybody actually does cross-renames. In Kumar's case the choice is the right one (and for a single normal directory rename it should always be, since the relative alphabetical sorting of the files will be identical), and we now get: rename board/{cds => freescale}/mpc8541cds/init.S (100%) rename board/{cds => freescale}/mpc8548cds/init.S (100%) which is the "expected" answer. However, it might still be better to change the pedantic "exact same basename" on/off choice into a more graduated "how similar are the pathnames" scoring situation, in order to be more likely to get the exact rename choice that people *expect* to see, rather than other alternatives that may *technically* be equally good, but are surprising to a human. It's also unclear whether we should consider "basenames are equal" or "have already used this as a source" to be more important. This gives them equal weight, but I suspect we might want to just multiple the "basenames are equal" weight by two, or something, to prefer equal basenames even if that causes a copy/delete pair. I dunno. Anyway, what I'm just saying in a really long-winded manner is that I think this is right as-is, but it's not the complete solution, and it may want some further tweaking in the future. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
601 lines
15 KiB
C
601 lines
15 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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/* 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_filespec *one;
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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_filespec *one,
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unsigned short score)
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{
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int first, last;
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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->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].one = one;
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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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int score;
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int 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, 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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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 (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
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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].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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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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{
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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 collission? */
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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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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)
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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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/* 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) : 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(void)
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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].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);
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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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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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int rename_limit = options->rename_limit;
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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;
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int num_create, num_src, dst_cnt;
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if (!minimum_score)
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minimum_score = DEFAULT_RENAME_SCORE;
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (!DIFF_FILE_VALID(p->one)) {
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if (!DIFF_FILE_VALID(p->two))
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continue; /* unmerged */
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else if (options->single_follow &&
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strcmp(options->single_follow, p->two->path))
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continue; /* not interested */
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else
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locate_rename_dst(p->two, 1);
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}
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else if (!DIFF_FILE_VALID(p->two)) {
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/*
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* If the source is a broken "delete", and
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* they did not really want to get broken,
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* that means the source actually stays.
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* So we increment the "rename_used" score
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* by one, to indicate ourselves as a user
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*/
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if (p->broken_pair && !p->score)
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p->one->rename_used++;
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register_rename_src(p->one, p->score);
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}
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else if (detect_rename == DIFF_DETECT_COPY) {
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/*
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* Increment the "rename_used" score by
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* one, to indicate ourselves as a user.
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*/
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p->one->rename_used++;
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register_rename_src(p->one, p->score);
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}
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}
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if (rename_dst_nr == 0 || rename_src_nr == 0)
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goto cleanup; /* nothing to do */
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/*
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* We really want to cull the candidates list early
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* with cheap tests in order to avoid doing deltas.
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*/
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rename_count = find_exact_renames();
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/* Did we only want exact renames? */
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if (minimum_score == MAX_SCORE)
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goto cleanup;
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/*
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* Calculate how many renames are left (but all the source
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* files still remain as options for rename/copies!)
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*/
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num_create = (rename_dst_nr - rename_count);
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num_src = rename_src_nr;
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/* All done? */
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if (!num_create)
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goto cleanup;
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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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*/
|
|
if (rename_limit <= 0 || rename_limit > 32767)
|
|
rename_limit = 32767;
|
|
if (num_create > rename_limit && num_src > rename_limit)
|
|
goto cleanup;
|
|
if (num_create * num_src > rename_limit * rename_limit)
|
|
goto cleanup;
|
|
|
|
mx = xmalloc(sizeof(*mx) * num_create * num_src);
|
|
for (dst_cnt = i = 0; i < rename_dst_nr; i++) {
|
|
int base = dst_cnt * num_src;
|
|
struct diff_filespec *two = rename_dst[i].two;
|
|
if (rename_dst[i].pair)
|
|
continue; /* dealt with exact match already. */
|
|
for (j = 0; j < rename_src_nr; j++) {
|
|
struct diff_filespec *one = rename_src[j].one;
|
|
struct diff_score *m = &mx[base+j];
|
|
m->src = j;
|
|
m->dst = i;
|
|
m->score = estimate_similarity(one, two,
|
|
minimum_score);
|
|
m->name_score = basename_same(one, two);
|
|
diff_free_filespec_blob(one);
|
|
}
|
|
/* We do not need the text anymore */
|
|
diff_free_filespec_blob(two);
|
|
dst_cnt++;
|
|
}
|
|
/* cost matrix sorted by most to least similar pair */
|
|
qsort(mx, num_create * num_src, sizeof(*mx), score_compare);
|
|
for (i = 0; i < num_create * num_src; i++) {
|
|
struct diff_rename_dst *dst = &rename_dst[mx[i].dst];
|
|
if (dst->pair)
|
|
continue; /* already done, either exact or fuzzy. */
|
|
if (mx[i].score < minimum_score)
|
|
break; /* there is no more usable pair. */
|
|
record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
|
|
rename_count++;
|
|
}
|
|
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.
|
|
*/
|
|
outq.queue = NULL;
|
|
outq.nr = outq.alloc = 0;
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
struct diff_filepair *pair_to_free = NULL;
|
|
|
|
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;
|
|
}
|