[Sorry for not seeing this before sending out v2.]
Junio C Hamano <gitster@xxxxxxxxx> writes:
> Thomas Gummerer <t.gummerer@xxxxxxxxx> 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@xxxxxxxxx>
>> ---
>> 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?
Yes you're right, I missed that. "git diff /var/tmp/[12]" inside a
working tree with a broken index has the same problems, which should be
fixed too. I'll try to fix that and send a new patch afterwards.
> 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
--
Thomas
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