Re: [PATCHv2 4/6] t7510: exit for loop with test result

[Jeff King <peff@peff.net>]

On Fri, Jun 13, 2014 at 12:42:46PM +0200, Michael J Gruber wrote:

> When t7510 was introduced, the author made sure that a for loop in
> a subshell would return with the appropriate error code.
> 
> Make sure this is true also the for the first line in each loop, which
> was missed.
> 
> Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
> ---
>  t/t7510-signed-commit.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
> index 5ddac1a..a5ba48e 100755
> --- a/t/t7510-signed-commit.sh
> +++ b/t/t7510-signed-commit.sh
> @@ -49,7 +49,7 @@ test_expect_success GPG 'show signatures' '
>  	(
>  		for commit in initial second merge fourth-signed fifth-signed sixth-signed master
>  		do
> -			git show --pretty=short --show-signature $commit >actual &&
> +			git show --pretty=short --show-signature $commit >actual || exit 1
>  			grep "Good signature from" actual || exit 1

Hrm. The original is:

  X &&
  Y || exit 1

Won't that still exit (i.e., it is already correct)? Doing:

  for X in true false; do
    for Y in true false; do
      ($X && $Y || exit 1)
      echo "$X/$Y: $?"
    done
  done

yields:

  true/true: 0
  true/false: 1
  false/true: 1
  false/false: 1

(and should still short-circuit Y, because we go from left-to-right).

I do not mind changing it to keep the style of each line consistent,
though. I would have written it as a series of "&&"-chains, with a
single exit at the end, but I think that is just a matter of preference.

-Peff