From: Junio C Hamano <gitster@pobox.com>
To: Thomas Gummerer <t.gummerer@gmail.com>
Cc: git@vger.kernel.org, "Alexey Borzenkov" <snaury@gmail.com>,
"René Scharfe" <l.s.r@web.de>,
"Michael Haggerty" <mhagger@alum.mit.edu>,
"Tim Henigan" <tim.henigan@gmail.com>,
"Bobby Powers" <bobbypowers@gmail.com>,
"Jens Lehmann" <Jens.Lehmann@web.de>, "Jeff King" <peff@peff.net>
Subject: Re: [PATCH] diff: don't read index when --no-index is given
Date: Mon, 09 Dec 2013 12:30:29 -0800 [thread overview]
Message-ID: <xmqqwqjdydga.fsf@gitster.dls.corp.google.com> (raw)
In-Reply-To: <1386590745-4412-1-git-send-email-t.gummerer@gmail.com> (Thomas Gummerer's message of "Mon, 9 Dec 2013 13:05:45 +0100")
Thomas Gummerer <t.gummerer@gmail.com> writes:
> git diff --no-index ... currently reads the index, during setup, when
> calling gitmodules_config(). In the usual case this gives us some
> performance drawbacks, but it's especially annoying if there is a broken
> index file.
>
> Avoid calling the unnecessary gitmodules_config() when the --no-index
> option is given. Also add a test to guard against similar breakages in the future.
>
> Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
> ---
> builtin/diff.c | 13 +++++++++++--
> t/t4053-diff-no-index.sh | 6 ++++++
> 2 files changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/diff.c b/builtin/diff.c
> index adb93a9..47c0833 100644
> --- a/builtin/diff.c
> +++ b/builtin/diff.c
> @@ -257,7 +257,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
> int blobs = 0, paths = 0;
> const char *path = NULL;
> struct blobinfo blob[2];
> - int nongit;
> + int nongit, no_index = 0;
> int result = 0;
>
> /*
> @@ -282,9 +282,18 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
> *
> * Other cases are errors.
> */
> + for (i = 1; i < argc; i++) {
> + if (!strcmp(argv[i], "--"))
> + break;
> + if (!strcmp(argv[i], "--no-index")) {
> + no_index = 1;
> + break;
> + }
> + }
This seems to duplicate only half the logic at the beginning of
diff_no_index(), right? E.g., running "git diff /var/tmp/[12]"
inside a working tree that is controlled by a Git repository when
/var/tmp/ is outside, we do want to behave as if the command line
were "git diff --no-index /var/tmp/[12]", but this half duplication
makes these two behave differently, no?
I think the issue you are trying to address is worth tackling, but I
wonder if a bit of preparatory refactoring is necessary to avoid the
partial duplication.
> prefix = setup_git_directory_gently(&nongit);
> - gitmodules_config();
> + if (!no_index)
> + gitmodules_config();
> git_config(git_diff_ui_config, NULL);
>
> init_revisions(&rev, prefix);
> diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
> index 979e983..a24ae4d 100755
> --- a/t/t4053-diff-no-index.sh
> +++ b/t/t4053-diff-no-index.sh
> @@ -29,4 +29,10 @@ test_expect_success 'git diff --no-index relative path outside repo' '
> )
> '
>
> +test_expect_success 'git diff --no-index with broken index' '
> + cd repo &&
> + echo broken >.git/index &&
> + test_expect_code 0 git diff --no-index a ../non/git/a
> +'
> +
> test_done
next prev parent reply other threads:[~2013-12-09 20:30 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-09 12:05 [PATCH] diff: don't read index when --no-index is given Thomas Gummerer
2013-12-09 15:16 ` Jonathan Nieder
2013-12-09 17:27 ` Jens Lehmann
2013-12-09 19:06 ` Jonathan Nieder
2013-12-09 19:14 ` Thomas Gummerer
2013-12-09 19:20 ` Jonathan Nieder
2013-12-09 20:40 ` [PATCH v2] " Thomas Gummerer
2013-12-09 20:55 ` Torsten Bögershausen
2013-12-09 20:57 ` Eric Sunshine
2013-12-09 21:17 ` Thomas Gummerer
2013-12-09 20:30 ` Junio C Hamano [this message]
2013-12-09 21:13 ` [PATCH] " Thomas Gummerer
2013-12-10 17:52 ` [PATCH v3 1/2] diff: move no-index detection to builtin/diff.c Thomas Gummerer
2013-12-10 17:52 ` [PATCH v3 2/2] diff: don't read index when --no-index is given Thomas Gummerer
2013-12-10 18:18 ` Jonathan Nieder
2013-12-10 18:55 ` Thomas Gummerer
2013-12-10 18:16 ` [PATCH v3 1/2] diff: move no-index detection to builtin/diff.c Jonathan Nieder
2013-12-10 18:46 ` Thomas Gummerer
2013-12-11 9:58 ` [PATCH v4 " Thomas Gummerer
2013-12-11 9:58 ` [PATCH v4 2/2] diff: don't read index when --no-index is given Thomas Gummerer
2013-12-12 20:25 ` Junio C Hamano
2013-12-14 0:44 ` Jonathan Nieder
2013-12-14 0:43 ` [PATCH v4 1/2] diff: move no-index detection to builtin/diff.c Jonathan Nieder
2013-12-14 10:42 ` Thomas Gummerer
2013-12-16 17:48 ` Junio C Hamano
2013-12-16 19:23 ` [PATCH 1/2] diff: add test for --no-index executed outside repo Thomas Gummerer
2013-12-16 19:23 ` [PATCH 2/2] diff: avoid some nesting Thomas Gummerer
2013-12-16 19:42 ` [PATCH 1/2] diff: add test for --no-index executed outside repo Junio C Hamano
2013-12-14 13:07 ` [PATCH v5 1/2] diff: move no-index detection to builtin/diff.c Thomas Gummerer
2013-12-14 13:07 ` [PATCH v5 2/2] diff: don't read index when --no-index is given Thomas Gummerer
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