Subject: Re: [PATCH v1 1/2] t0027: Correct raciness in NNO test

From: Junio C Hamano <[email-masked]>
Date: Fri, 12 Aug 2016 10:56:48 -0700

[email-masked] writes:

> From: Torsten Bögershausen <[email-masked]>
>
> When a non-reversible CRLF conversion is done in "git add",
> a warning is printed on stderr (or Git dies, depending on checksafe)
>
> The function commit_chk_wrnNNO() in t0027 was written to test this,
> but did the wrong thing: Instead of looking at the warning
> from "git add", it looked at the warning from "git commit".
>
> This is racy because "git commit" may not have to do CRLF conversion
> at all if it can use the sha1 value from the index (which depends on
> whether "add" and "commit" run in a single second).
>
> Correct this and replace the commit for each and every file with a commit
> of all files in one go.
>
> The function commit_chk_wrnNNO() will to be renamed in a separate commit.
> Thanks to Jeff King <[email-masked]> for analyzing t0027.
>
> Reported-By: Johannes Schindelin <[email-masked]>
> ---

Missing sign-off.  The reasoning above looks very clearly explained.

Thanks.

>  t/t0027-auto-crlf.sh | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/t/t0027-auto-crlf.sh b/t/t0027-auto-crlf.sh
> index 2860d2d..ab6e962 100755
> --- a/t/t0027-auto-crlf.sh
> +++ b/t/t0027-auto-crlf.sh
> @@ -119,8 +119,7 @@ commit_chk_wrnNNO () {
>  		fname=${pfx}_$f.txt &&
>  		cp $f $fname &&
>  		printf Z >>"$fname" &&
> -		git -c core.autocrlf=$crlf add $fname 2>/dev/null &&
> -		git -c core.autocrlf=$crlf commit -m "commit_$fname" $fname >"${pfx}_$f.err" 2>&1
> +		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
>  	done
>  
>  	test_expect_success "commit NNO files crlf=$crlf attr=$attr LF" '
> @@ -394,11 +393,11 @@ test_expect_success 'commit files attr=crlf' '
>  
>  #                 attr                    LF        CRLF      CRLFmixLF   LF_mix_CR   CRLFNUL
>  commit_chk_wrnNNO ""      ""      false   ""        ""        ""          ""          ""
> -commit_chk_wrnNNO ""      ""      true    LF_CRLF   ""        ""          ""          ""
> +commit_chk_wrnNNO ""      ""      true    ""        ""        ""          ""          ""
>  commit_chk_wrnNNO ""      ""      input   ""        ""        ""          ""          ""
>  
> -commit_chk_wrnNNO "auto"  ""      false   "$WILC"   ""        ""          ""          ""
> -commit_chk_wrnNNO "auto"  ""      true    LF_CRLF   ""        ""          ""          ""
> +commit_chk_wrnNNO "auto"  ""      false   ""        ""        ""          ""          ""
> +commit_chk_wrnNNO "auto"  ""      true    ""        ""        ""          ""          ""
>  commit_chk_wrnNNO "auto"  ""      input   ""        ""        ""          ""          ""
>  for crlf in true false input
>  do
> @@ -408,7 +407,7 @@ do
>  	commit_chk_wrnNNO ""    lf      $crlf   ""       CRLF_LF    CRLF_LF      ""         CRLF_LF
>  	commit_chk_wrnNNO ""    crlf    $crlf   LF_CRLF   ""        LF_CRLF     LF_CRLF     ""
>  	commit_chk_wrnNNO auto  lf    	$crlf   ""        ""        ""          ""          ""
> -	commit_chk_wrnNNO auto  crlf  	$crlf   LF_CRLF   ""        ""          ""          ""
> +	commit_chk_wrnNNO auto  crlf  	$crlf   ""        ""        ""          ""          ""
>  	commit_chk_wrnNNO text  lf    	$crlf   ""       CRLF_LF    CRLF_LF     ""          CRLF_LF
>  	commit_chk_wrnNNO text  crlf  	$crlf   LF_CRLF   ""        LF_CRLF     LF_CRLF     ""
>  done
> @@ -417,7 +416,8 @@ commit_chk_wrnNNO "text"  ""      false   "$WILC"   "$WICL"   "$WAMIX"    "$WILC
>  commit_chk_wrnNNO "text"  ""      true    LF_CRLF   ""        LF_CRLF     LF_CRLF     ""
>  commit_chk_wrnNNO "text"  ""      input   ""        CRLF_LF   CRLF_LF     ""          CRLF_LF
>  
> -test_expect_success 'create files cleanup' '
> +test_expect_success 'commit NNO and cleanup' '
> +	git commit -m "commit files on top of NNO" &&
>  	rm -f *.txt &&
>  	git -c core.autocrlf=false reset --hard
>  '