Re: [PATCH v2 2/5] pager: test for exit code with and without SIGPIPE

> Add tests for how git behaves when the pager itself exits with
> non-zero, as well as for us exiting with 141 when we're killed with
> SIGPIPE due to the pager not consuming its output.
> 
> There is some recent discussion[1] about these semantics, but aside
> from what we want to do in the future, we should have a test for the
> current behavior.
> 
> This test construct is stolen from 7559a1be8a0 (unblock and unignore
> SIGPIPE, 2014-09-18). The reason not to make the test itself depend on
> the MINGW prerequisite is to make a subsequent commit easier to read.

> 
> 1. https://lore.kernel.org/git/87o8h4omqa.fsf@evledraar.gmail.com/
> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
>  t/t7006-pager.sh | 82 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 82 insertions(+)
> 
> diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
> index fdb450e446a..0aa030962b1 100755
> --- a/t/t7006-pager.sh
> +++ b/t/t7006-pager.sh
> @@ -656,4 +656,86 @@ test_expect_success TTY 'git tag with auto-columns ' '
>  	test_cmp expect actual
>  '
>  
> +test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
> +	test_when_finished "rm pager-used" &&
> +	test_config core.pager ">pager-used; head -n 1; exit 0" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test_match_signal 13 "$OUT"
> +	else
> +		test_terminal git log
> +	fi &&
> +	test_path_is_file pager-used
> +'
> +
> +test_expect_success TTY 'git returns SIGPIPE on early pager non-zero exit' '
> +	test_when_finished "rm pager-used" &&
> +	test_config core.pager ">pager-used; head -n 1; exit 1" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test_match_signal 13 "$OUT"
> +	else
> +		test_terminal git log
> +	fi &&
> +	test_path_is_file pager-used
> +'
> +
> +test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
> +	test_when_finished "rm pager-used" &&
> +	test_config core.pager "wc >pager-used; exit 1" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test "$OUT" -eq 0
> +	else
> +		test_terminal git log
> +	fi &&
> +	test_path_is_file pager-used
> +'
> +
> +test_expect_success TTY 'git discards nonexisting pager without SIGPIPE' '
> +	test_when_finished "rm pager-used" &&
> +	test_config core.pager "wc >pager-used; does-not-exist" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test "$OUT" -eq 0
> +	else
> +		test_terminal git log
> +	fi &&
> +	test_path_is_file pager-used
> +'
> +
> +test_expect_success TTY 'git attempts to page to nonexisting pager command, gets SIGPIPE' '
> +	test_config core.pager "does-not-exist" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test_match_signal 13 "$OUT"
> +	else
> +		test_terminal git log
> +	fi
> +'
> +
> +test_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
> +	test_when_finished "rm pager-used" &&
> +	test_config core.pager ">pager-used; test-tool sigchain" &&
> +
> +	if test_have_prereq !MINGW
> +	then
> +		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
> +		test_match_signal 13 "$OUT"
> +	else
> +		test_terminal git log
> +	fi &&
> +	test_path_is_file pager-used
> +'
> +
>  test_done
>