log -G: ignore binary files

t-b · gitster · commit e0e7cb8080cb · 2018-12-26T14:59:37.000-08:00
The -G<regex> option of log looks for the differences whose patch text contains added/removed lines that match regex. Currently -G looks also into patches of binary files (which according to [1]) is binary as well. This has a couple of issues: - It makes the pickaxe search slow. In a proprietary repository of the author with only ~5500 commits and a total .git size of ~300MB searching takes ~13 seconds $time git log -Gwave > /dev/null real 0m13,241s user 0m12,596s sys 0m0,644s whereas when we ignore binary files with this patch it takes ~4s $time ~/devel/git/git log -Gwave > /dev/null real 0m3,713s user 0m3,608s sys 0m0,105s which is a speedup of more than fourfold. - The internally used algorithm for generating patch text is based on xdiff and its states in [1] > The output format of the binary patch file is proprietary > (and binary) and it is basically a collection of copy and insert > commands [..] which means that the current format could change once the internal algorithm is changed as the format is not standardized. In addition the git binary patch format used for preparing patches for git apply is *different* from the xdiff format as can be seen by comparing git log -p -a commit 6e95bf4bafccf14650d02ab57f3affe669be10cf Author: A U Thor <author@example.com> Date: Thu Apr 7 15:14:13 2005 -0700 modify binary file diff --git a/data.bin b/data.bin index f414c84..edfeb6f 100644 --- a/data.bin +++ b/data.bin @@ -1,2 +1,4 @@ a a^@A +a +a^@A with git log --binary commit 6e95bf4bafccf14650d02ab57f3affe669be10cf Author: A U Thor <author@example.com> Date: Thu Apr 7 15:14:13 2005 -0700 modify binary file diff --git a/data.bin b/data.bin index f414c84bd3aa25fa07836bb1fb73db784635e24b..edfeb6f501[..] GIT binary patch literal 12 QcmYe~N@Pgn0zx1O01)N^ZvX%Q literal 6 NcmYe~N@Pgn0ssWg0XP5v which seems unexpected. To resolve these issues this patch makes -G<regex> ignore binary files by default. Textconv filters are supported and also -a/--text for getting the old and broken behaviour back. The -S<block of text> option of log looks for differences that changes the number of occurrences of the specified block of text (i.e. addition/deletion) in a file. As we want to keep the current behaviour, add a test to ensure it stays that way. [1]: http://www.xmailserver.org/xdiff.html Signed-off-by: Thomas Braun <thomas.braun@virtuell-zuhause.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
@@ -524,6 +524,8 @@ struct), and want to know the history of that block since it first
 came into being: use the feature iteratively to feed the interesting
 block in the preimage back into `-S`, and keep going until you get the
 very first version of the block.
++
+Binary files are searched as well.
 
 -G<regex>::
 	Look for differences whose patch text contains added/removed
@@ -543,6 +545,9 @@ While `git log -G"regexec\(regexp"` will show this commit, `git log
 -S"regexec\(regexp" --pickaxe-regex` will not (because the number of
 occurrences of that string did not change).
 +
+Unless `--text` is supplied patches of binary files without a textconv
+filter will be ignored.
++
 See the 'pickaxe' entry in linkgit:gitdiffcore[7] for more
 information.
 
diff --git a/Documentation/gitdiffcore.txt b/Documentation/gitdiffcore.txt
@@ -242,7 +242,8 @@ textual diff has an added or a deleted line that matches the given
 regular expression.  This means that it will detect in-file (or what
 rename-detection considers the same file) moves, which is noise.  The
 implementation runs diff twice and greps, and this can be quite
-expensive.
+expensive.  To speed things up binary files without textconv filters
+will be ignored.
 
 When `-S` or `-G` are used without `--pickaxe-all`, only filepairs
 that match their respective criterion are kept in the output.  When
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
@@ -154,6 +154,12 @@ static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
 	if (textconv_one == textconv_two && diff_unmodified_pair(p))
 		return 0;
 
+	if ((o->pickaxe_opts & DIFF_PICKAXE_KIND_G) &&
+	    !o->flags.text &&
+	    ((!textconv_one && diff_filespec_is_binary(o->repo, p->one)) ||
+	     (!textconv_two && diff_filespec_is_binary(o->repo, p->two))))
+		return 0;
+
 	mf1.size = fill_textconv(o->repo, textconv_one, p->one, &mf1.ptr);
 	mf2.size = fill_textconv(o->repo, textconv_two, p->two, &mf2.ptr);
 
diff --git a/t/t4209-log-pickaxe.sh b/t/t4209-log-pickaxe.sh
@@ -106,4 +106,39 @@ test_expect_success 'log -S --no-textconv (missing textconv tool)' '
 	rm .gitattributes
 '
 
+test_expect_success 'setup log -[GS] binary & --text' '
+	git checkout --orphan GS-binary-and-text &&
+	git read-tree --empty &&
+	printf "a\na\0a\n" >data.bin &&
+	git add data.bin &&
+	git commit -m "create binary file" data.bin &&
+	printf "a\na\0a\n" >>data.bin &&
+	git commit -m "modify binary file" data.bin &&
+	git rm data.bin &&
+	git commit -m "delete binary file" data.bin &&
+	git log >full-log
+'
+
+test_expect_success 'log -G ignores binary files' '
+	git log -Ga >log &&
+	test_must_be_empty log
+'
+
+test_expect_success 'log -G looks into binary files with -a' '
+	git log -a -Ga >log &&
+	test_cmp log full-log
+'
+
+test_expect_success 'log -G looks into binary files with textconv filter' '
+	test_when_finished "rm .gitattributes" &&
+	echo "* diff=bin" >.gitattributes &&
+	git -c diff.bin.textconv=cat log -Ga >log &&
+	test_cmp log full-log
+'
+
+test_expect_success 'log -S looks into binary files' '
+	git log -Sa >log &&
+	test_cmp log full-log
+'
+
 test_done
