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@xxxxxxxxxxx>
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@xxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxx>
---
Changes since v2:
- Introduce a setup step for the new tests
- Really start with a clean history in the tests
- Added more complex commit history for the tests
- Use test_when_finished for cleanup instead of doing nothing
- Enhanced commit message to motivate the change better
- Added some more documentation
Documentation/diff-options.txt | 5 +++++
Documentation/gitdiffcore.txt | 3 ++-
diffcore-pickaxe.c | 6 ++++++
t/t4209-log-pickaxe.sh | 35 ++++++++++++++++++++++++++++++++++
4 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 0378cd574e..b94d332f71 100644
--- 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
index c0a60f3158..c970d9fe43 100644
--- 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
index 69fc55ea1e..4cea086f80 100644
--- 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
index 844df760f7..5d06f5f45e 100755
--- 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
--
2.19.0.271.gfe8321ec05.dirty
