From: Junio C Hamano <gitster@pobox.com>
Date: Sat, 02 Jan 2010 19:45:29 GMT
Subject: Re: [PATCH] grep: do not do external grep on skip-worktree entries
Message-ID: <7v7hs09tpi.fsf@alter.siamese.dyndns.org>
In-Reply-To: <fcaeb9bf1001021115j7b23264n42cfba7855c2253e@mail.gmail.com>

Nguyen Thai Ngoc Duy <pclouds@gmail.com> writes:

>>  > +support_external_grep() {
>>  > +     case "$(git grep -h 2>&1 >/dev/null|grep -e --ext-grep)" in
>>  > +     *"(default)"*)  return 0;;
>>  > +     *"(ignored by this build)"*) return 1;;
>>  > +     *) test_expect_success 'External grep check is broken' 'false';;
>>  > +     esac
>>  > +}
>>
>>
>> Heh, clever.
>>
>>         git grep -h 2>&1 | grep 'allow calling of grep.*default' >/dev/null
>>
>>  may be sufficient, though.
>
> Yes, until somebody changes help text in builtin-grep.c and all
> external grep tests become disable. I wanted to catch that case too.

Ok, that is a worthwhile thing to do.

Then please at least make the second grep "grep ext-grep", droping "-e --"
from it.  We assume some implementation of external grep to lack "-e"
(e.g. Solaris).